Tüm alıştırma soruları

8270 soru

Tüm türler8,270 Çoktan seçmeli4,249 Çoklu seçim325 Sayısal160 Eşleştirme1,849 Sıralama1,687

A 64-year-old man is evaluated in the hospital for a 3-week history of progressive abdominal distension and worsening exertional dyspnea. He denies fever, orthopnea, or abdominal pain. Medical history is significant for severe chronic obstructive pulmonary disease (COPD) treated with inhaled fluticasone and umeclidinium-vilanterol. He has a 40-pack-year smoking history.

Vital signs include a temperature of 37.1°C (98.8°F), blood pressure of 118/74 mmHg, pulse of 92/min, and respiratory rate of 18/min. Pulse oximetry is 93% on room air.

Physical examination reveals an estimated jugular venous pressure of 12 cm H₂O. Pulmonary auscultation reveals scattered expiratory wheezes with a prolonged expiratory phase. The abdomen is distended with shifting dullness and a positive fluid wave. A firm, smooth liver edge is palpated 4 cm below the right costal margin. Trace bilateral lower extremity pitting edema is present.

Diagnostic laboratory testing reveals the following:

Source	Test	Result
Arterial Blood Gas (Room Air)	pH	7.36
pCO₂	55 mmHg
pO₂	65 mmHg
HCO₃⁻	30 mEq/L
Serum	Albumin	3.4 g/dL
Total bilirubin	2.1 mg/dL
AST	115 U/L
ALT	98 U/L
Alkaline phosphatase	145 U/L
Ascitic Fluid	Appearance	Yellow, clear
Total protein	3.1 g/dL
Albumin	1.8 g/dL
Leukocyte count	210/mm³ (15% neutrophils)

Which of the following is the most appropriate next step in the management of this patient?

Echocardiography

Doppler ultrasonography of the abdomen

Systemic corticosteroid therapy

Intravenous ceftriaxone therapy

Intravenous sodium bicarbonate

Cevabı ve açıklamayı göster

Cevap: Echocardiography

Cevap

Echocardiography

The correct next step is to evaluate for right heart failure via echocardiography. Ascites etiology is systematically determined using the serum-ascites albumin gradient (SAAG). This patient's SAAG is

3.4 - 1.8 = 1.6

g/dL, which is

\geq 1.1

g/dL, indicating portal hypertension. Next, the ascitic fluid total protein is analyzed: a value

\geq 2.5

g/dL signifies intact hepatic sinusoids (post-sinusoidal hypertension), effectively ruling out standard cirrhosis. The differential diagnosis for high SAAG, high protein ascites is primarily right heart failure versus Budd-Chiari syndrome. The presence of elevated jugular venous pressure (12 cm H₂O) in the setting of severe COPD confirms cor pulmonale (cardiac ascites). Echocardiography is the definitive non-invasive next step to assess right ventricular function and pulmonary pressures.

Adım Adım Çözüm

Calculate the serum-ascites albumin gradient (SAAG).

SAAG = Serum albumin (3.4 g/dL) - Ascitic albumin (1.8 g/dL) = 1.6 g/dL.

A SAAG

\geq 1.1

g/dL indicates the presence of portal hypertension (e.g., cirrhosis, cardiac ascites, Budd-Chiari syndrome).

Evaluate the ascitic fluid total protein to differentiate causes of portal hypertension.

The ascitic total protein is 3.1 g/dL (which is

\geq 2.5

g/dL).

High-protein ascites occurs when the hepatic sinusoids are intact, allowing protein to leak into the peritoneum. This indicates a post-sinusoidal etiology, such as cardiac ascites or Budd-Chiari syndrome, ruling out cirrhosis (which typically has protein

< 2.5

g/dL).

Differentiate between post-sinusoidal etiologies using physical examination findings.

The patient has an elevated jugular venous pressure (12 cm H₂O).

Elevated JVP points definitively toward a cardiac etiology (right heart failure / cor pulmonale) rather than Budd-Chiari syndrome, where JVP remains normal.

Determine the next appropriate step to evaluate the suspected etiology.

Echocardiography should be ordered.

In a patient with long-standing severe COPD presenting with signs of right heart failure and cardiac ascites, echocardiography is required to assess right ventricular hypertrophy, dilation, and function.

Anahtar Kavram

Ascitic fluid analysis combining a SAAG

\geq 1.1

g/dL and total protein

\geq 2.5

g/dL alongside elevated jugular venous pressure identifies cardiac ascites, differentiating it from cirrhosis and Budd-Chiari syndrome.

Soru 7382Soru →

An alert 42-year-old female is evaluated in the urgent care clinic for persistent weakness, severe muscle cramps, and three days of voluminous, watery stools after attending a community barbecue. Her past medical history is significant for severe obesity and obstructive sleep apnea, for which she uses continuous positive airway pressure (CPAP) inconsistently at night. Vital signs show a temperature of 37.4°C (99.3°F), pulse of 108/min, respirations of 22/min, and blood pressure of 102/64 mmHg. Physical examination reveals dry mucous membranes and decreased skin turgor. The following laboratory values are reported:

Test	Result
Sodium	$140 \text{ mEq/L}$
Potassium	$3.1 \text{ mEq/L}$
Chloride	$114 \text{ mEq/L}$
Bicarbonate	$14 \text{ mEq/L}$
Blood urea nitrogen	$32 \text{ mg/dL}$
Serum creatinine	$1.2 \text{ mg/dL}$
Arterial pH	$7.24$
Arterial $pCO_2$	$52 \text{ mmHg}$
Arterial $pO_2$	$78 \text{ mmHg}$

Based on the provided laboratory values and clinical presentation, which of the following best characterizes this patient's acid-base status?

Normal anion gap metabolic acidosis and respiratory acidosis

Normal anion gap metabolic acidosis with appropriate respiratory compensation

High anion gap metabolic acidosis and respiratory acidosis

Primary respiratory acidosis with metabolic compensation

Normal anion gap metabolic acidosis and respiratory alkalosis

Cevabı ve açıklamayı göster

Cevap: Normal anion gap metabolic acidosis and respiratory acidosis

Cevap

The patient has a mixed acid-base disorder consisting of a normal anion gap metabolic acidosis and a respiratory acidosis.

The correct answer characterizes the presence of two distinct acid-base disorders. First, the patient's arterial pH is

7.24

with a low bicarbonate (

14 \text{ mEq/L}

), confirming a metabolic acidosis. The anion gap is

140 - (114 + 14) = 12

, which is a normal anion gap metabolic acidosis, classically caused by severe gastrointestinal bicarbonate losses (diarrhea). Second, to verify if the respiratory compensation is adequate, Winter's formula must be applied:

\text{Expected } pCO_2 = 1.5 \times [HCO_3^-] + 8 \pm 2

. For a bicarbonate of

14 \text{ mEq/L}

, the expected

pCO_2

27-31 \text{ mmHg}

. The patient's measured

pCO_2

52 \text{ mmHg}

. Because the actual

pCO_2

is much higher than the expected

pCO_2

, the patient is hypoventilating relative to her metabolic state, indicating a concurrent respiratory acidosis. Her history of severe obesity and obstructive sleep apnea strongly suggests baseline

CO_2

retention (obesity hypoventilation syndrome), explaining the respiratory component.

Adım Adım Çözüm

Analyze the pH and primary derangement.

The pH is

7.24

(acidemia). Both the

HCO_3^-

(

14 \text{ mEq/L}

) and the

pCO_2

(

52 \text{ mmHg}

) are contributing to acidemia, indicating a mixed disorder or at least a primary metabolic acidosis with abnormal

pCO_2

Establishing the direction of pH change and corresponding variables dictates the primary disorder.

Calculate the anion gap (AG).

\text{AG} = Na^+ - (Cl^- + HCO_3^-) = 140 - (114 + 14) = 12 \text{ mEq/L}

Differentiates the cause of the metabolic acidosis. An AG of

12

is normal, consistent with bicarbonate loss from severe diarrhea.

Calculate the expected respiratory compensation using Winter's formula.

\text{Expected } pCO_2 = 1.5 \times [HCO_3^-] + 8 \pm 2 = (1.5 \times 14) + 8 = 29 \pm 2 \text{ mmHg}

Determines if the patient's ventilation is appropriately compensating for the metabolic acidosis.

Compare the actual

pCO_2

to the expected

pCO_2

The actual

pCO_2

52 \text{ mmHg}

, which is significantly higher than the expected range of

27-31 \text{ mmHg}

An actual

pCO_2

greater than the expected

pCO_2

indicates a superimposed, independent respiratory acidosis (likely due to the patient's obesity hypoventilation and sleep apnea).

Anahtar Kavram

Identifying mixed acid-base disorders using the anion gap and Winter's formula for respiratory compensation.

Tahmini Süre:1m 30s

Soru 7383Soru →

A $58$ -year-old man with decompensated cirrhosis due to alcohol use disorder is evaluated on hospital day $3$ for ongoing management of spontaneous bacterial peritonitis. He initially presented with a temperature of $38.2^\circ\text{C}$ ( $100.8^\circ\text{F}$ ), diffuse abdominal pain, and confusion. Diagnostic paracentesis on admission showed an ascitic fluid absolute neutrophil count of $850/\text{mm}^3$ . Because of a history of extended-spectrum beta-lactamase (ESBL)-producing *Escherichia coli* bacteriuria $6$ months ago, he was empirically started on intravenous meropenem. Intravenous albumin ( $1.5$ g/kg) was also administered on admission based on the following laboratory results:

Admission (Day 1):
Blood urea nitrogen: $34$ mg/dL
Serum creatinine: $1.5$ mg/dL
Total bilirubin: $5.2$ mg/dL

Today (Day 3), the patient is feeling much better. His temperature is $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), and his mental status has returned to baseline. Ascitic fluid cultures from admission have grown *Klebsiella pneumoniae*. Antimicrobial susceptibility testing is as follows:
Ampicillin: Resistant
Ceftriaxone: Susceptible
Ciprofloxacin: Susceptible
Meropenem: Susceptible
Piperacillin-tazobactam: Susceptible

Current laboratory results:
Blood urea nitrogen: $24$ mg/dL
Serum creatinine: $1.1$ mg/dL
Total bilirubin: $4.5$ mg/dL

Which of the following is the most appropriate next step in the management of this patient?

Continue intravenous meropenem and administer intravenous albumin

Continue intravenous meropenem and withhold intravenous albumin

Switch to intravenous ceftriaxone and administer intravenous albumin

Switch to intravenous ceftriaxone and withhold intravenous albumin

Switch to oral ciprofloxacin and withhold intravenous albumin

Cevabı ve açıklamayı göster

Cevap: Switch to intravenous ceftriaxone and administer intravenous albumin

Cevap

Switch to intravenous ceftriaxone and administer intravenous albumin

The correct approach involves de-escalating antibiotic therapy to a narrower-spectrum agent and completing the protocol-driven albumin infusion. The ascitic fluid culture grew *Klebsiella pneumoniae* susceptible to ceftriaxone. While the initial choice of meropenem was justified by the patient's history of ESBL-producing bacteriuria and severe presentation, antimicrobial stewardship mandates de-escalation once sensitivities are available to prevent the development of multidrug-resistant organisms. Ceftriaxone provides targeted and highly effective coverage for this isolate. Furthermore, patients with spontaneous bacterial peritonitis (SBP) who meet high-risk criteria upon diagnosis (serum creatinine >

1.0

mg/dL, blood urea nitrogen >

30

mg/dL, or total bilirubin >

4.0

mg/dL) require intravenous albumin to prevent hepatorenal syndrome. The proven regimen is

1.5

g/kg on Day 1 and

1.0

g/kg on Day 3. Because this patient met all three criteria initially, the Day 3 albumin dose must be administered to complete the prophylactic course and prevent clinical deterioration, despite the interim improvement in his renal indices.

Adım Adım Çözüm

Evaluate the antibiotic susceptibility results for the isolated pathogen.

The *Klebsiella pneumoniae* isolate is susceptible to ceftriaxone.

Determines if the empiric broad-spectrum antibiotic (meropenem) can be de-escalated to a narrower, targeted agent.

Apply principles of antimicrobial stewardship.

Therapy should be switched from intravenous meropenem to intravenous ceftriaxone.

Meropenem is an ultra-broad-spectrum carbapenem. De-escalation to ceftriaxone (a third-generation cephalosporin) provides effective treatment while minimizing the selection pressure for multidrug-resistant organisms.

Assess the indication for Day 3 albumin administration.

The patient must receive the Day 3 dose of intravenous albumin.

The patient met the high-risk criteria for hepatorenal syndrome on Day 1 (Cr > 1.0 mg/dL, BUN > 30 mg/dL). The standard prophylactic regimen requires albumin on Day 1 (

1.5

g/kg) and Day 3 (

1.0

g/kg). The Day 3 dose is mandatory to complete the protocol, even if renal indices have improved.

Anahtar Kavram

In patients with spontaneous bacterial peritonitis, empiric broad-spectrum antibiotics should be de-escalated based on culture susceptibilities, and those meeting high-risk criteria on admission must complete the full Day 1 and Day 3 intravenous albumin protocol to prevent hepatorenal syndrome.

Soru 7384Soru →

Determine the most appropriate immediate surgical or procedural intervention for each of the following critically injured trauma patients.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

The correct pairings identify the immediate life-saving intervention for each specific traumatic presentation based on ATLS protocols: cardiac tamponade requires thoracotomy, retroperitoneal pelvic bleeding requires angiography or packing, unstable intraperitoneal bleeding requires laparotomy, a 'cannot intubate, cannot oxygenate' airway requires cricothyroidotomy, and hard signs of vascular injury require operative exploration.

Each clinical scenario presents a classic ATLS decision point. The neck stab wound patient has an impending airway disaster with failed intubation, necessitating a surgical cricothyroidotomy. The patient with the parasternal stab wound has cardiac tamponade and requires a thoracotomy. The blunt abdominal trauma patient is unstable with a positive FAST, mandating an exploratory laparotomy. The pelvic fracture patient is unstable with a negative FAST, meaning the bleeding is retroperitoneal and requires angioembolization or packing. Finally, the extremity trauma patient has hard signs of vascular injury, requiring immediate operative vascular exploration.

Adım Adım Çözüm

Evaluate the airway and breathing status.

The patient with the neck stab wound and failed intubation has a definitively compromised airway.

Airway is the first priority in the ATLS primary survey, and a definitive surgical airway must be established when non-surgical methods fail.

Assess circulation and identify the anatomical source of shock.

Shock sources are localized to the pericardium (tamponade), retroperitoneum (pelvis), and intraperitoneal space (abdomen).

Interventions for shock are location-specific; misidentifying the bleeding source leads to incorrect and potentially fatal surgical approaches.

Match specific hard signs of vascular trauma to operative management.

The extremity gunshot wound exhibits hard signs (pulsatile hematoma, absent pulses).

Hard signs of vascular injury mandate immediate surgical exploration rather than further diagnostic imaging.

Anahtar Kavram

Advanced Trauma Life Support (ATLS) Primary Survey and Resuscitation Algorithms

Soru 7385Soru →

A 55-year-old man with a history of intravenous drug use comes to the emergency department reporting severe, unrelenting lower back pain for the past 3 weeks. The pain is worse at night, is not relieved by rest, and is accompanied by subjective fevers. He reports no leg weakness, numbness, or bowel and bladder incontinence. Temperature is 38.2°C (100.8°F), pulse is 92/min, and blood pressure is 128/78 mm Hg. Physical examination shows focal tenderness to percussion over the L4 and L5 spinous processes. Neurologic examination of the lower extremities reveals full strength, normal sensation, and intact reflexes bilaterally. Arrange the following steps in the most appropriate chronological sequence for the diagnostic workup and management of this patient.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequence is: 1) Obtain blood cultures and inflammatory markers, 2) Perform an MRI of the lumbar spine, 3) Perform a CT-guided bone biopsy (if blood cultures are negative), and 4) Initiate targeted antibiotic therapy.

The proper management of native vertebral osteomyelitis in a neurologically stable patient prioritizes establishing a microbiologic diagnosis before initiating therapy. Blood cultures are drawn first as they are non-invasive and often diagnostic. MRI follows to confirm the extent of infection and rule out surgical emergencies like epidural abscess. If blood cultures are negative, a CT-guided bone biopsy is essential. Empiric antibiotics are deliberately withheld during this workup to prevent sterilizing the cultures, ensuring that the eventual long-term antibiotic course is appropriately targeted to the specific pathogen.

Adım Adım Çözüm

Obtain blood cultures and inflammatory markers.

Establishes baseline inflammation and potentially identifies the pathogen non-invasively.

Blood cultures are rapid, non-invasive, and can preclude the need for a bone biopsy if they yield the causative organism.

Perform an MRI of the lumbar spine.

Confirms the diagnosis of vertebral osteomyelitis and evaluates the extent of infection.

MRI is the gold standard imaging test and is critical to rule out spinal epidural abscess or cord compression.

Perform a CT-guided needle biopsy if blood cultures are sterile.

Obtains infected tissue for definitive microbiologic culture and histopathology.

A precise microbiologic diagnosis is required. Empiric antibiotics must be withheld to avoid sterilizing this sample in neurologically stable patients.

Initiate targeted intravenous antibiotic therapy.

Provides definitive, pathogen-directed treatment.

Extended antibiotic therapy is tailored to the specific sensitivities of the identified organism to ensure efficacy and promote antimicrobial stewardship.

Anahtar Kavram

In neurologically stable patients with suspected native vertebral osteomyelitis, empiric antibiotics must be withheld until a microbiologic diagnosis is established via blood cultures or image-guided bone biopsy.

Soru 7386Soru →

A 59-year-old man presents to the emergency department with a two-day history of fever, left-sided chest pain, and persistent hiccups. Ten days ago, he underwent an emergent laparotomy with splenectomy following a motor vehicle collision. His temperature is 39.1°C (102.4°F), blood pressure is 118/76 mmHg, pulse is 112/min, and respirations are 22/min. Pulse oximetry shows 94% on room air. Physical examination reveals decreased breath sounds at the left lung base. The abdomen is soft but tender to deep palpation in the left upper quadrant. The surgical incision is well-healed without erythema or discharge. Laboratory studies show a leukocyte count of 18,500/mm³. A chest radiograph demonstrates a left-sided pleural effusion with basilar atelectasis. Which of the following is the most appropriate next step in management?

Computed tomography of the abdomen

Diagnostic thoracentesis

Administration of intravenous furosemide

Initiation of empiric antibiotics and observation

Computed tomography pulmonary angiography

Cevabı ve açıklamayı göster

Cevap: Computed tomography of the abdomen

Cevap

Computed tomography of the abdomen

The correct next step is to obtain a computed tomography scan of the abdomen. This patient presents with classical features of a left subphrenic abscess on postoperative day 10 following a splenectomy. An intra-abdominal abscess typically presents 1 to 2 weeks after surgery with swinging fevers and leukocytosis. Inflammation adjacent to the diaphragm can cause irritation of the phrenic nerve (leading to persistent hiccups) and referred pain to the shoulder or pleura. Furthermore, the local inflammatory response often leads to a reactive, sterile pleural effusion and basilar atelectasis on the affected side. A CT scan of the abdomen is the most sensitive and specific test to diagnose a subphrenic abscess and can simultaneously guide percutaneous drainage.

Adım Adım Çözüm

Analyze the timing of the patient's presentation.

The patient is postoperative day 10, which increases the probability of a deep space surgical site infection, such as an intra-abdominal abscess.

Postoperative fever timing ('5 Ws') helps narrow the differential diagnosis.

Evaluate the clinical signs and symptoms.

The combination of fever, left upper quadrant tenderness, hiccups, and left-sided pleural effusion points to inflammation near the left hemidiaphragm.

Hiccups result from diaphragmatic irritation, and reactive pleural effusions frequently occur adjacent to subphrenic fluid collections.

Determine the optimal diagnostic modality.

A CT scan of the abdomen is selected to visualize the intra-abdominal anatomy and identify any fluid collections.

CT imaging is the gold standard for diagnosing a subphrenic abscess and planning potential percutaneous drainage.

Anahtar Kavram

Patients who develop fever, left upper quadrant pain, hiccups, and a reactive left pleural effusion several days after splenic or gastric surgery should be evaluated for a subphrenic abscess using a computed tomography scan of the abdomen.

Soru 7387Soru →

A $58$ -year-old man with a history of cirrhosis secondary to untreated hepatitis C is admitted to the hospital due to progressive lethargy and abdominal distension over the past $48$ hours. His temperature is $38.2^\circ\text{C}$ ( $100.8^\circ\text{F}$ ), pulse is $102/\text{min}$ , blood pressure is $105/65\text{ mmHg}$ , and respirations are $18/\text{min}$ . Physical examination reveals scleral icterus, a distended abdomen with shifting dullness, and diffuse mild tenderness without rebound or guarding. Asterixis is present.

Laboratory studies show:

Laboratory Test	Result
Leukocyte count	$11,500/\text{mm}^3$
Serum creatinine	$1.8 \text{ mg/dL}$ (baseline: $1.1 \text{ mg/dL}$ )
Blood urea nitrogen	$42 \text{ mg/dL}$
Total bilirubin	$3.5 \text{ mg/dL}$
Arterial blood gas	pH $7.32$ , pCO $_2$ $30 \text{ mmHg}$ , HCO $_3^-$ $16 \text{ mEq/L}$

A diagnostic paracentesis is performed:

Ascitic Fluid Analysis	Result
Appearance	Turbid
Total nucleated cells	$800/\text{mm}^3$
Neutrophils	$80\%$
Total protein	$1.1 \text{ g/dL}$

The patient is immediately started on intravenous cefotaxime. Which of the following is the most appropriate additional step in this patient's management?

Intravenous administration of albumin

Addition of intravenous vancomycin and piperacillin-tazobactam

Emergent exploratory laparotomy

Initiation of intravenous furosemide and spironolactone

Intravenous administration of sodium bicarbonate

Cevabı ve açıklamayı göster

Cevap: Intravenous administration of albumin

Cevap

Intravenous administration of albumin

The correct answer identifies the crucial adjunctive role of intravenous albumin in spontaneous bacterial peritonitis (SBP). This patient's ascitic fluid absolute neutrophil count (ANC) is

640/\text{mm}^3

(calculated as

800 \times 0.80

), which is

> 250/\text{mm}^3

, confirming the diagnosis of SBP. He concurrently has an acute kidney injury with a serum creatinine of

1.8 \text{ mg/dL}

(baseline

1.1 \text{ mg/dL}

) and BUN of

42 \text{ mg/dL}

. SBP causes profound splanchnic vasodilation, which can severely reduce the effective arterial blood volume and precipitate hepatorenal syndrome (HRS). The administration of intravenous albumin (

1.5 \text{ g/kg}

on day 1, and

1.0 \text{ g/kg}

on day 3) provides critical plasma volume expansion. Guidelines mandate albumin for patients with SBP who have a serum creatinine

> 1.0 \text{ mg/dL}

, a BUN

> 30 \text{ mg/dL}

, or a bilirubin

> 4.0 \text{ mg/dL}

, as it significantly decreases the incidence of renal impairment and improves survival.

Adım Adım Çözüm

Calculate the absolute neutrophil count (ANC) of the ascitic fluid.

ANC = Total nucleated cells

\times

percentage of neutrophils =

800 \times 0.80 = 640/\text{mm}^3

An ANC

\geq 250/\text{mm}^3

is diagnostic for spontaneous bacterial peritonitis (SBP).

Identify high-risk features for hepatorenal syndrome (HRS) in this patient with SBP.

The patient has an elevated serum creatinine (

1.8 \text{ mg/dL}

) and blood urea nitrogen (

42 \text{ mg/dL}

Patients with SBP are at high risk for HRS if their serum creatinine is

> 1.0 \text{ mg/dL}

, BUN is

> 30 \text{ mg/dL}

, or total bilirubin is

> 4.0 \text{ mg/dL}

Determine the appropriate adjunctive therapy to antibiotic treatment for high-risk SBP.

Intravenous albumin must be administered alongside a third-generation cephalosporin.

Albumin prevents the extreme vasodilation and severe effective arterial blood volume depletion that triggers HRS, significantly reducing mortality in this subset of patients.

Anahtar Kavram

In patients with spontaneous bacterial peritonitis (SBP) who have concurrent acute kidney injury or high-risk features (BUN

> 30 \text{ mg/dL}

, creatinine

> 1.0 \text{ mg/dL}

), intravenous albumin must be given alongside targeted antibiotics to prevent hepatorenal syndrome and reduce mortality.

Tahmini Süre:1m 30s

Soru 7388Soru →

Match each patient's clinical presentation with the most appropriate definitive management or next step in intervention.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

The correct pairings align the specific hepatobiliary or gastrointestinal pathology with its guideline-directed intervention based on severity and anatomy.

Each presentation represents a distinct pathology with a specific algorithmic treatment approach based on the severity of illness. Critically ill patients with acalculous cholecystitis need percutaneous drainage. Gallstone ileus requires surgical removal of the obstructing stone. Reynolds pentad indicates severe ascending cholangitis requiring emergent ERCP decompression. Uncomplicated biliary colic is treated electively.

Adım Adım Çözüm

Analyze each clinical vignette to establish the most likely diagnosis.

Identified acalculous cholecystitis, gallstone ileus, acute suppurative cholangitis, and biliary colic.

Accurate diagnosis is the prerequisite for selecting the correct surgical or procedural management.

Determine the hemodynamic status and surgical risk of each patient.

The ICU patient and the patient with Reynolds pentad are highly unstable, requiring minimally invasive or emergent temporizing procedures rather than immediate major surgery.

Surgical risk stratification determines whether a definitive operation or a temporizing drainage procedure is appropriate.

Match the diagnosis and stability to the intervention.

Matched acalculous cholecystitis to percutaneous drainage, gallstone ileus to enterolithotomy, severe cholangitis to ERCP, and biliary colic to elective surgery.

This aligns with standard gastrointestinal and abdominal surgery treatment algorithms.

Anahtar Kavram

Surgical Triage and Management of Biliary and Gastrointestinal Pathologies

Soru 7389Soru →

A 32-year-old woman comes to the emergency department complaining of sudden-onset palpitations and mild shortness of breath that started 30 minutes ago. She has no significant past medical history. Her temperature is 37.0°C (98.6°F), blood pressure is 118/76 mmHg, pulse is 185/min, and respiratory rate is 18/min. Pulse oximetry is 99% on room air. An electrocardiogram reveals a regular, narrow-complex tachycardia with no discernible P waves. Assuming each subsequent intervention fails to terminate the arrhythmia and the patient remains hemodynamically stable until the final step, arrange the following management options in the correct sequential order from first to last according to standard treatment algorithms.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequential order for managing stable, regular, narrow-complex tachycardia is: Valsalva maneuver, followed by intravenous adenosine, followed by intravenous diltiazem, and finally synchronized electrical cardioversion.

The management of stable, regular, narrow-complex tachycardia (such as AV nodal reentrant tachycardia) follows a well-defined sequence. Because the patient is hemodynamically stable (normal blood pressure, mentation, and perfusion), non-invasive vagal maneuvers (e.g., Valsalva) should be attempted first to increase vagal tone and block the AV node. If this fails, rapid intravenous adenosine is the first-line medication due to its short half-life and high efficacy in terminating AV node-dependent arrhythmias. If adenosine is ineffective or the arrhythmia recurs, longer-acting AV nodal blocking agents like intravenous diltiazem or metoprolol are used. Synchronized electrical cardioversion is reserved as a last resort for refractory stable SVT or is used immediately if the patient becomes unstable.

Adım Adım Çözüm

Assess the patient's hemodynamic status.

The patient has a normal blood pressure (118/76 mmHg) and no signs of shock, indicating she is hemodynamically stable.

Hemodynamic stability dictates whether to pursue a stepwise pharmacological approach or proceed directly to immediate electrical cardioversion.

Analyze the electrocardiogram.

The ECG shows a regular, narrow-complex tachycardia, consistent with paroxysmal supraventricular tachycardia (PSVT).

The specific rhythm determines the appropriate management algorithm.

Determine the stepwise management sequence for stable PSVT.

The sequence is vagal maneuvers, then adenosine, then AV nodal blocking agents (like diltiazem), then electrical cardioversion.

This sequence progresses from the least invasive and safest intervention to more invasive and aggressive therapies.

Anahtar Kavram

The stepwise management of hemodynamically stable paroxysmal supraventricular tachycardia (PSVT) prioritizes vagal maneuvers, followed by adenosine, then non-dihydropyridine calcium channel blockers or beta-blockers, reserving cardioversion for refractory or unstable cases.

Tahmini Süre:1m 30s

Soru 7390Soru →

A 68-year-old man is brought to the emergency department by his daughter due to a 1-day history of fever, severe right upper quadrant abdominal pain, and new-onset confusion. His temperature is 39.4°C (102.9°F), blood pressure is 86/52 mm Hg, and pulse is 122/min. Physical examination reveals scleral icterus and marked right upper quadrant tenderness to palpation with guarding. Laboratory studies show a leukocyte count of 18,500/mm³, an elevated direct bilirubin level, and elevated alkaline phosphatase. Arrange the following management steps in the most appropriate chronological sequence for this patient.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequence is to first stabilize the patient hemodynamically and obtain blood cultures, followed immediately by broad-spectrum intravenous antibiotics, then confirm the diagnosis with non-invasive imaging (ultrasound), and finally perform definitive biliary decompression (ERCP).

The correct sequence for managing severe acute cholangitis with septic shock (Reynolds pentad) strictly follows the principles of sepsis management combined with source control. Hemodynamic stabilization and obtaining blood cultures are paramount. This is immediately followed by broad-spectrum antibiotics. Once the patient is stabilized medically, right upper quadrant ultrasound is used to confirm biliary dilation, paving the way for urgent definitive biliary decompression with ERCP.

Adım Adım Çözüm

Identify the clinical syndrome from the patient's presentation.

The patient has Reynolds pentad (fever, jaundice, right upper quadrant pain, confusion, hypotension), diagnostic of severe acute ascending cholangitis complicated by septic shock.

Recognizing the severity of the condition dictates the immediate prioritization of medical resuscitation over diagnostic and invasive procedures.

Determine the most immediate life-saving intervention.

Establish intravenous access, start crystalloid resuscitation, and draw blood cultures.

Sepsis protocols mandate immediate circulatory support to restore perfusion and obtaining cultures prior to antimicrobial therapy.

Select the next step in medical management.

Administer empiric broad-spectrum intravenous antibiotics.

Prompt antibiotic administration is critical for survival in septic shock and should follow culture collection immediately.

Choose the appropriate initial diagnostic modality.

Perform a right upper quadrant abdominal ultrasound.

Ultrasound confirms biliary obstruction safely and quickly at the bedside before proceeding to invasive interventions.

Determine the definitive treatment.

Perform urgent endoscopic retrograde cholangiopancreatography (ERCP).

Purulent bile must be drained to cure the underlying cause of sepsis, which is safely performed once the patient is resuscitated and the anatomy is confirmed.

Anahtar Kavram

The management of severe acute cholangitis requires a stepwise approach prioritizing hemodynamic resuscitation and broad-spectrum antibiotics, followed by non-invasive imaging, and finally urgent biliary decompression via ERCP.

Soru 7391Soru →

Review the following diagnostic laboratory profiles of patients presenting with cushingoid features (such as central obesity, proximal muscle weakness, and abdominal striae). Match each laboratory and testing profile with its most appropriate underlying pathophysiologic etiology.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

Profile 1 matches Adrenal adenoma. Profile 2 matches Pituitary adenoma. Profile 3 matches Ectopic ACTH secretion. Profile 4 matches Exogenous glucocorticoid use.

The standard diagnostic approach to Cushing syndrome requires step-wise biochemical evaluation. Once hypercortisolism is confirmed (via 24-hour urine free cortisol, late-night salivary cortisol, or low-dose dexamethasone suppression), plasma ACTH is measured. Suppressed ACTH (<5 pg/mL) indicates ACTH-independent disease (e.g., adrenal adenoma). If a patient has suppressed ACTH, low urine cortisol, and cushingoid features, it is diagnostic of exogenous corticosteroid use. Conversely, an elevated ACTH level indicates an ACTH-dependent state. High-dose dexamethasone (8 mg) is then utilized: pituitary adenomas will suppress their ACTH secretion (decreasing cortisol by >50%), whereas ectopic ACTH-producing tumors will not suppress.

Adım Adım Çözüm

Evaluate the plasma ACTH level in the context of cushingoid features.

A suppressed ACTH level indicates an ACTH-independent process (adrenal or exogenous). An elevated or inappropriately normal ACTH level indicates an ACTH-dependent process (pituitary or ectopic).

Cortisol normally exerts negative feedback on the pituitary. If cortisol is high and ACTH is suppressed, the source of cortisol is outside the pituitary axis.

Differentiate the ACTH-independent causes based on cortisol levels.

High endogenous cortisol with low ACTH points to an adrenal adenoma or carcinoma. Low endogenous cortisol with low ACTH in a patient with cushingoid signs strongly points to exogenous synthetic glucocorticoid use.

Synthetic glucocorticoids (like prednisone or dexamethasone) cause tissue manifestations of Cushing syndrome and suppress the HPA axis but are not cross-reactive on standard serum/urine cortisol assays, leading to low measured levels.

Differentiate the ACTH-dependent causes using the high-dose dexamethasone suppression test.

Suppression of serum cortisol indicates a pituitary adenoma (Cushing disease). Lack of suppression indicates an ectopic ACTH source (e.g., small cell lung cancer).

Pituitary corticotroph adenomas retain partial sensitivity to glucocorticoid negative feedback, whereas ectopic neuroendocrine tumors typically lack functional glucocorticoid receptors and secrete ACTH entirely autonomously.

Anahtar Kavram

The diagnostic algorithm for Cushing syndrome (hypercortisolism) utilizes ACTH levels to determine dependency, followed by high-dose dexamethasone suppression to localize the source of ACTH.

Soru 7392Soru →

A medical team is rounding on a $59$ -year-old man admitted $3$ days ago with fever, abdominal pain, and confusion. He has a known history of decompensated cirrhosis due to chronic hepatitis C. At the time of admission, an emergency diagnostic paracentesis yielded cloudy fluid with an absolute neutrophil count of $850/\text{mm}^3$ , confirming spontaneous bacterial peritonitis. Because he had been hospitalized $4$ weeks prior for a variceal bleed, the inpatient team initiated empiric therapy with intravenous piperacillin-tazobactam to cover potential healthcare-associated pathogens.

Currently, the patient is clinically stable. His confusion has cleared, and he reports no abdominal pain. Vital signs today show a temperature of $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), blood pressure of $112/70\,\text{mmHg}$ , and a heart rate of $78/\text{min}$ . The microbiology laboratory reports that the admission ascitic fluid culture is positive for *Escherichia coli*. Antimicrobial susceptibility testing demonstrates that the isolate is sensitive to ceftriaxone, cefotaxime, and ciprofloxacin, but resistant to ampicillin.

Which of the following is the most appropriate next step in pharmacotherapy?

Change to intravenous ceftriaxone

Continue intravenous piperacillin-tazobactam

Change to intravenous meropenem

Change to intravenous cefepime

Add intravenous vancomycin

Cevabı ve açıklamayı göster

Cevap: Change to intravenous ceftriaxone

Cevap

Change the antibiotic regimen to intravenous ceftriaxone.

The correct step is to de-escalate the antibiotic regimen to intravenous ceftriaxone. This patient was appropriately started on broad-spectrum empiric therapy (piperacillin-tazobactam) for spontaneous bacterial peritonitis (SBP) due to his recent hospitalization risk factor. However, once the offending organism (*Escherichia coli*) is identified and susceptibilities are known, standard antibiotic stewardship principles dictate narrowing the spectrum of coverage. Because the isolate is susceptible to ceftriaxone—a third-generation cephalosporin that is highly effective for SBP—transitioning to this narrower agent minimizes collateral damage to the patient's microbiome and reduces the risk of developing resistance.

Adım Adım Çözüm

Evaluate the patient's clinical response and microbiology data.

The patient shows clinical improvement, and the ascitic fluid culture has isolated E. coli susceptible to ceftriaxone.

Confirming clinical stability allows for the safe de-escalation of empiric antibiotic therapy based on definitive culture results.

Apply principles of antimicrobial stewardship to select definitive therapy.

Identify that the current broad-spectrum regimen (piperacillin-tazobactam) is wider than necessary for a ceftriaxone-susceptible organism.

Using the narrowest effective agent minimizes adverse effects, reduces collateral damage to normal flora, and prevents the emergence of multidrug-resistant pathogens.

Determine the optimal targeted antibiotic for Spontaneous Bacterial Peritonitis.

Transition to intravenous ceftriaxone to complete the treatment course.

Third-generation cephalosporins are the standard of care for SBP caused by susceptible Gram-negative enteric organisms.

Anahtar Kavram

Once antimicrobial susceptibility results are available, empiric broad-spectrum antibiotics should be de-escalated to the narrowest effective targeted agent (e.g., ceftriaxone) to promote antibiotic stewardship and minimize resistance.

Soru 7393Soru →

A 72-year-old man with a history of advanced prostate cancer presents to the emergency department with severe, progressively worsening mid-back pain over the past two weeks. Over the last 24 hours, he has developed bilateral lower extremity weakness and difficulty voiding urine. Neurological examination reveals 3/5 strength in the bilateral lower extremities, decreased sensation to pinprick below the umbilicus, and hyperreflexia at the knees. A diagnosis of malignant epidural spinal cord compression (MESCC) is highly suspected. Arrange the following management steps in the correct chronological order.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequence for managing suspected malignant epidural spinal cord compression is: immediate administration of intravenous dexamethasone, followed by an urgent MRI of the entire spine, specialty oncology consultation, and finally definitive surgical or radiation therapy.

The correct sequence prioritizes the preservation of neurologic function. Malignant epidural spinal cord compression is initially a clinical diagnosis. High-dose glucocorticoids reduce peritumoral edema and must be given immediately upon clinical suspicion to protect the spinal cord. Once neurologic function is provisionally protected, an MRI of the entire spine is obtained to confirm the diagnosis and delineate the anatomy. Following imaging, multidisciplinary consultation is obtained to decide on definitive therapy, which is then implemented as the final step.

Adım Adım Çözüm

Recognize the clinical signs of malignant epidural spinal cord compression.

The patient demonstrates back pain, motor weakness, a distinct sensory level, and autonomic (bowel/bladder) dysfunction in the setting of known metastatic prostate cancer.

Prompt recognition of this oncologic emergency dictates the immediate need for empiric therapy.

Determine the most urgent therapeutic intervention to preserve function.

Intravenous dexamethasone is indicated immediately.

Glucocorticoids decrease vasogenic edema surrounding the tumor, relieving pressure and preventing irreversible ischemic injury to the spinal cord. This must be done before sending the patient for imaging.

Select the appropriate confirmatory diagnostic test.

Urgent MRI of the entire spine is ordered.

MRI provides high-resolution visualization of the spinal cord, identifies the exact extent of the tumor, and evaluates for synchronous asymptomatic lesions elsewhere in the spine.

Determine subsequent definitive management based on imaging findings.

Consultation with surgical and radiation oncology to plan definitive therapy.

Definitive management depends on multiple variables including tumor radiosensitivity, degree of spinal instability, and overall patient prognosis, requiring a multidisciplinary approach.

Anahtar Kavram

In patients with suspected malignant epidural spinal cord compression, empiric high-dose intravenous glucocorticoids must be administered immediately to preserve neurologic function, before confirmatory imaging with an MRI of the spine is obtained.

Soru 7394Soru →

A $27$ -year-old man is brought to the emergency department after sustaining a single stab wound during an altercation. The wound is located in the left $7\text{th}$ intercostal space at the midaxillary line. On arrival, he is lethargic and noticeably diaphoretic. His temperature is $36.8^\circ\text{C}$ ( $98.2^\circ\text{F}$ ), heart rate is $132/\text{min}$ , blood pressure is $75/45\text{ mmHg}$ , and respiratory rate is $24/\text{min}$ .

On primary survey, his airway is patent. Breath sounds are equal and clear bilaterally. A portable chest radiograph shows a normal mediastinal silhouette and no evidence of pneumothorax or hemothorax. The abdomen is moderately distended, but there is no evisceration. A Focused Assessment with Sonography for Trauma (FAST) examination reveals a significant amount of free fluid in the splenorenal recess.

The patient receives a rapid infusion of $1\text{ L}$ of warmed lactated Ringer solution and $1$ unit of emergency-release type O-negative blood. Reassessment reveals a blood pressure of $78/40\text{ mmHg}$ and a heart rate of $128/\text{min}$ .

Which of the following is the most appropriate next step in management?

Computed tomography scan of the abdomen and pelvis

Diagnostic peritoneal lavage

Immediate exploratory laparotomy

Left-sided tube thoracostomy

Local wound exploration

Cevabı ve açıklamayı göster

Cevap: Immediate exploratory laparotomy

Cevap

Immediate exploratory laparotomy

The correct answer is immediate exploratory laparotomy. This patient has sustained a penetrating stab wound to the thoracoabdominal region (the "box," extending from the

4\text{th}

intercostal space down to the costal margins), which carries a high risk of intra-abdominal injury due to diaphragmatic excursion. He presents in hemorrhagic shock that is unresponsive to initial fluid and blood resuscitation. The primary survey and normal portable chest radiograph effectively rule out a massive hemothorax or tension pneumothorax as the cause of his shock. Concurrently, the Focused Assessment with Sonography for Trauma (FAST) examination confirms the presence of intraperitoneal hemorrhage. According to standard trauma protocols, any patient with penetrating trauma who is hemodynamically unstable and has evidence of intraperitoneal bleeding (e.g., a positive FAST) or peritonitis must bypass further diagnostic testing and proceed directly to the operating room for an immediate exploratory laparotomy to surgically control the hemorrhage.

Adım Adım Çözüm

Evaluate the patient's hemodynamic status and mechanism of injury.

The patient has a penetrating stab wound to the left

7\text{th}

intercostal space and is in hemorrhagic shock (BP

75/45\text{ mmHg}

, HR

132/\text{min}

) that is unresponsive to initial fluid and blood resuscitation.

Hemodynamic instability determines the urgency of intervention and strictly precludes time-consuming diagnostic tests like CT scans.

Assess the primary survey and imaging adjuncts to localize the source of bleeding.

Clear breath sounds and a normal chest radiograph effectively rule out life-threatening intrathoracic bleeding. The FAST examination is positive for free fluid in the splenorenal recess.

Stab wounds below the

4\text{th}

intercostal space can involve the abdomen due to diaphragmatic excursion. The positive FAST confirms an intraperitoneal source for the hemorrhagic shock.

Determine the next best step in management based on the algorithmic approach to trauma.

Proceed directly to immediate exploratory laparotomy.

Any hemodynamically unstable patient with penetrating thoracoabdominal trauma and evidence of intraperitoneal bleeding requires immediate surgical exploration for hemorrhage control.

Anahtar Kavram

Hemodynamically unstable patients with penetrating thoracoabdominal trauma and a positive FAST examination require immediate exploratory laparotomy.

Soru 7395Soru →

Match each clinical presentation of shock with its most characteristic invasive hemodynamic profile (Central Venous Pressure [CVP], Pulmonary Capillary Wedge Pressure [PCWP], Cardiac Index [CI], and Systemic Vascular Resistance [SVR]).

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

Massive abdominal hemorrhage matches the hypovolemic profile (Decreased CVP/PCWP, Decreased CI, Increased SVR). Anterior myocardial infarction matches the cardiogenic profile (Increased CVP/PCWP, Decreased CI, Increased SVR). E. coli bacteremia matches the distributive profile (Decreased/Normal CVP/PCWP, Increased CI, Decreased SVR). Massive pulmonary embolism matches the obstructive profile (Increased CVP, Decreased/Normal PCWP, Decreased CI, Increased SVR).

Each physiological classification of shock presents with a unique pattern of hemodynamic variables that dictates its management.

Shock Type	CVP (Right Preload)	PCWP (Left Preload)	Cardiac Index (Pump)	SVR (Afterload)
Hypovolemic	Decreased	Decreased	Decreased	Increased
Cardiogenic	Increased	Increased	Decreased	Increased
Distributive (Septic)	Decreased/Normal	Decreased/Normal	Increased	Decreased
Obstructive (PE)	Increased	Decreased/Normal	Decreased	Increased

Hypovolemic shock involves a global volume deficit. Cardiogenic shock involves a failing pump leading to vascular congestion. Septic shock fundamentally involves a loss of vascular tone (low SVR) leading to a hyperdynamic heart. Obstructive shock (specifically PE) represents a barrier between the right and left heart, causing congestion before the block and underfilling after it.

Adım Adım Çözüm

Evaluate the underlying mechanism for the massive abdominal hemorrhage scenario.

Identified as hypovolemic shock.

Significant blood loss directly reduces venous return (preload) to both sides of the heart.

Evaluate the underlying mechanism for the anterior myocardial infarction scenario.

Identified as cardiogenic shock.

Anterior ischemia causes primary left ventricular systolic dysfunction and forward flow failure.

Evaluate the underlying mechanism for the E. coli bacteremia scenario.

Identified as septic (distributive) shock.

Endotoxins cause massive peripheral vasodilation, which is the hallmark primary derangement in this shock state.

Evaluate the underlying mechanism for the massive pulmonary embolism scenario.

Identified as obstructive shock.

A physical blockage in the pulmonary arteries impedes flow from the right side of the heart to the left.

Map the derived mechanisms to their respective hemodynamic patterns.

Matched each scenario to the right-side item containing the correct physiological derangements.

Hemodynamic parameters logically follow the primary mechanism: pump failure increases preload parameters behind the failure, volume loss decreases all preload parameters, vasodilation decreases afterload, and right-sided obstruction increases right-sided preload while starving the left side.

Anahtar Kavram

Hemodynamic profiles of shock states (hypovolemic, cardiogenic, distributive, and obstructive).

Soru 7396Soru →

A 55-year-old male presents to the triage desk of the local hospital reporting progressive difficulty breathing that began two days ago. He states that he has been unable to sleep in his bed due to a feeling of suffocation and has been resting in a recliner chair. He also notes a new cough that occasionally produces pink, frothy sputum. Medical history is significant for essential hypertension, type 2 diabetes mellitus, and a 40-pack-year smoking history. Current medications include lisinopril, amlodipine, and metformin. Vital signs demonstrate a temperature of $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), blood pressure of $178/102$ mmHg, pulse of 112/min, and respiratory rate of 26/min. Pulse oximetry reveals an oxygen saturation of 89% on room air. On physical examination, the patient appears distressed and is using accessory muscles to breathe. Evaluation of the neck shows jugular venous distention up to the angle of the mandible while seated upright. Cardiac auscultation is notable for a regular, rapid rhythm and a low-frequency diastolic sound heard best at the cardiac apex. Lung auscultation reveals bilateral expiratory wheezes and fine crackles extending from the bases to the mid-lung zones. Which of the following is the most appropriate initial pharmacologic therapy for this patient?

Intravenous furosemide

Nebulized albuterol

Intravenous methylprednisolone

Intravenous ceftriaxone and azithromycin

Intravenous magnesium sulfate

Cevabı ve açıklamayı göster

Cevap: Intravenous furosemide

Cevap

Intravenous furosemide

The correct answer is intravenous furosemide. This patient is presenting with classic signs of acute decompensated heart failure (ADHF) leading to pulmonary edema. Key diagnostic clues include orthopnea (sleeping in a recliner), pink frothy sputum, marked hypertension, elevated jugular venous pressure, an S3 gallop, and bilateral crackles. The diffuse wheezing is a manifestation of peribronchial airway edema secondary to fluid overload, a phenomenon often termed 'cardiac asthma.' The immediate priority in managing ADHF with volume overload is preload reduction, which is rapidly achieved with intravenous loop diuretics like furosemide.

Adım Adım Çözüm

Identify the primary clinical syndrome based on presenting symptoms and vital signs.

The patient presents with severe dyspnea, orthopnea, hypoxemia, and severe hypertension, indicating acute respiratory distress of a cardiopulmonary origin.

Initial stabilization requires determining whether the primary etiology is pulmonary (e.g., COPD, pneumonia) or cardiac (e.g., heart failure).

Analyze the physical examination findings to differentiate between heart failure and primary pulmonary disease.

Findings of jugular venous distention, an S3 gallop (low-frequency diastolic sound), pink frothy sputum, and bilateral crackles strongly indicate left ventricular volume overload and elevated filling pressures.

While the patient has a smoking history and wheezing, these specific volume-overload signs point to acute decompensated heart failure (ADHF) causing 'cardiac asthma' rather than a COPD exacerbation.

Select the most appropriate initial pharmacotherapy for the identified condition.

Intravenous loop diuretics (e.g., furosemide) are indicated to rapidly reduce preload and relieve pulmonary edema.

Immediate diuresis is the cornerstone of ADHF management to improve oxygenation and reduce symptoms.

Anahtar Kavram

Diagnosis and acute management of acute decompensated heart failure presenting with cardiac asthma.

Tahmini Süre:1m 30s

Soru 7397Soru →

A 74-year-old man is brought to the emergency department after experiencing three episodes of massive, painless hematochezia over the past two hours. His medical history is significant for coronary artery disease, hypertension, and osteoarthritis, for which he takes daily aspirin and naproxen. On arrival, he appears pale and diaphoretic. His temperature is 36.8°C (98.2°F), blood pressure is 84/52 mm Hg, pulse is 122/min, and respirations are 20/min. Abdominal examination is unremarkable with no tenderness or guarding. Rectal examination reveals copious amounts of bright red blood. Arrange the following steps in the most appropriate sequence for the evaluation and management of this patient's acute presentation.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct sequence is: (1) Intravenous fluid resuscitation, (2) Esophagogastroduodenoscopy, (3) Computed tomography angiography, and (4) Mesenteric angiography with embolization.

In a patient presenting with massive hematochezia and hemorrhagic shock, the initial step is always hemodynamic resuscitation with intravenous fluids and blood products. Because a massive, rapid upper GI bleed can present with bright red blood per rectum, an esophagogastroduodenoscopy (EGD) must be the first diagnostic procedure performed. If the EGD is negative, the source is confirmed to be in the lower GI tract. In an unstable patient, there is no time for bowel preparation; thus, CT angiography is the test of choice to localize the bleeding, followed by therapeutic catheter-directed mesenteric angiography to embolize the bleeding vessel.

Adım Adım Çözüm

Initiate aggressive fluid resuscitation via large-bore IV access.

Restoration of intravascular volume and hemodynamic stability.

The patient is in hypovolemic shock (hypotension, tachycardia) due to acute blood loss, making airway, breathing, and circulation the absolute first priority.

Perform an urgent Esophagogastroduodenoscopy (EGD).

Excludes or identifies an upper gastrointestinal source of bleeding.

Approximately 10-15% of patients presenting with massive hematochezia and hemodynamic instability actually have a brisk upper GI bleed, especially in the context of NSAID use. This must be ruled out before assuming a lower GI source.

Obtain a CT angiography (CTA) of the abdomen and pelvis.

Localizes the site of active lower GI bleeding.

If the EGD is negative and the patient continues to have massive bleeding or remains unstable, colonoscopy is contraindicated due to the inability to achieve adequate bowel preparation and the high risk of complications. CTA is rapid and highly sensitive for localizing active extravasation.

Proceed with catheter-directed mesenteric angiography.

Therapeutic embolization of the bleeding vessel.

Following localization via CTA, angiography is used to definitively treat the bleeding source in hemodynamically unstable patients who cannot undergo colonoscopy.

Anahtar Kavram

Management algorithm for massive hematochezia with hemodynamic instability

Soru 7398Soru →

A 62-year-old man with a history of alcohol-associated cirrhosis is brought to the emergency department due to progressive confusion, lethargy, and fever over the past 2 days. His temperature is $38.6^\circ\text{C}$ ( $101.5^\circ\text{F}$ ), blood pressure is $95/60\text{ mm Hg}$ , heart rate is $112/\text{min}$ , and respiratory rate is $22/\text{min}$ . Physical examination is notable for scleral icterus, spider angiomas, a distended abdomen with a positive fluid wave, and bilateral lower extremity pitting edema.

Laboratory studies show:
Sodium: $136\text{ mEq/L}$
Potassium: $3.8\text{ mEq/L}$
Chloride: $104\text{ mEq/L}$
Bicarbonate: $18\text{ mEq/L}$
BUN: $32\text{ mg/dL}$
Creatinine: $1.5\text{ mg/dL}$
Glucose: $98\text{ mg/dL}$
Albumin: $2.0\text{ g/dL}$
Total bilirubin: $4.5\text{ mg/dL}$

Arterial blood gas on room air reveals a pH of $7.32$ and a $PaCO_2$ of $34\text{ mm Hg}$ .

Assuming a reference normal serum albumin of $4.0\text{ g/dL}$ , what is this patient's albumin-corrected serum anion gap in mEq/L?

Cevabı ve açıklamayı göster

Cevap: 19

Cevap

This patient has a metabolic acidosis (pH 7.32, low bicarbonate). To accurately assess the etiology, the serum anion gap must be calculated and corrected for his severe hypoalbuminemia. The uncorrected anion gap is

Na^+ - (Cl^- + HCO_3^-) = 136 - (104 + 18) = 14\text{ mEq/L}

. Because albumin is negatively charged, it constitutes a significant portion of the baseline 'unmeasured anions'. A decrease in albumin falsely lowers the calculated anion gap. The standard correction requires adding

2.5\text{ mEq/L}

to the calculated gap for every

1\text{ g/dL}

decrease in albumin below

4.0\text{ g/dL}

. Here, the deficit is

4.0 - 2.0 = 2.0\text{ g/dL}

. The correction is

2.0 \times 2.5 = 5\text{ mEq/L}

. Adding this to the uncorrected gap yields

14 + 5 = 19\text{ mEq/L}

. This reveals a high anion gap metabolic acidosis, likely secondary to lactic acidosis from sepsis.

Adım Adım Çözüm

Calculate the uncorrected anion gap.

14\text{ mEq/L}

Using the standard formula:

AG = 136 - (104 + 18) = 14\text{ mEq/L}

Calculate the albumin deficit.

2.0\text{ g/dL}

Subtract the patient's albumin from normal:

4.0\text{ g/dL} - 2.0\text{ g/dL} = 2.0\text{ g/dL}

Calculate the albumin-corrected anion gap.

19\text{ mEq/L}

Add the correction factor to the uncorrected gap:

14 + (2.0 \times 2.5) = 14 + 5 = 19\text{ mEq/L}

Anahtar Kavram

Albumin is a major unmeasured anion; in hypoalbuminemic states, the calculated anion gap is falsely lowered and must be corrected by adding

2.5\text{ mEq/L}

for every

1\text{ g/dL}

decrease in serum albumin.

Soru 7399Soru →

A $62$ -year-old man presents to the emergency department with a $3$ -day history of worsening left lower quadrant abdominal pain, fever, and anorexia. His temperature is $38.8^\circ\text{C}$ ( $101.8^\circ\text{F}$ ), blood pressure is $122/78\text{ mm Hg}$ , and pulse is $102/\text{min}$ . Physical examination demonstrates significant focal tenderness and guarding in the left lower quadrant without diffuse peritonitis. Laboratory testing shows a leukocyte count of $17,200/\text{mm}^3$ with a left shift. Empiric broad-spectrum intravenous antibiotics are initiated immediately. Assuming the initial diagnostic imaging confirms acute complicated diverticulitis with a $5\text{ cm}$ pericolic abscess, arrange the following management steps in the most appropriate chronological sequence.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct chronological sequence for managing this patient is: 1) CT of the abdomen and pelvis with contrast, 2) Percutaneous image-guided catheter drainage, 3) De-escalation to targeted antibiotics, 4) Delayed diagnostic colonoscopy, and 5) Elective segmental sigmoid resection.

The standard of care for suspected acute diverticulitis begins with diagnostic CT imaging. Upon identification of a macro-abscess (generally

>3\text{ cm}

), the immediate next step is percutaneous drainage to achieve source control. Once cultures are obtained from the drain, broad-spectrum antibiotics should be de-escalated to targeted therapy to adhere to antibiotic stewardship guidelines. After the acute episode fully resolves (typically

6

8

weeks later), a delayed colonoscopy is mandatory to rule out an underlying malignancy that may have precipitated the perforation. Finally, because the patient experienced a complicated episode (abscess), they should be evaluated for a definitive elective sigmoid resection to prevent future life-threatening recurrences.

Adım Adım Çözüm

Obtain CT of the abdomen and pelvis with contrast

Confirms the diagnosis of acute complicated diverticulitis and localizes the

5\text{ cm}

pericolic abscess.

This is the safest and most accurate initial diagnostic test. Acute colonoscopy is strictly contraindicated due to perforation risk.

Perform percutaneous image-guided catheter drainage

Achieves prompt source control of the infection and provides fluid for microbiological culture.

Abscesses larger than

3

4\text{ cm}

typically do not resolve with antibiotics alone and require drainage. This avoids emergency multi-stage surgery (Hartmann procedure).

De-escalate empiric antibiotics to targeted therapy

Narrows the antimicrobial spectrum based on specific culture sensitivities from the drained fluid.

Aligns with antibiotic stewardship to prevent resistance and secondary infections (e.g., C. difficile) once the pathogen is identified.

Perform delayed diagnostic colonoscopy

Evaluates the colonic mucosa to rule out underlying malignancy.

Diverticulitis can radiographically mimic colon cancer. Delaying the procedure

6

8

weeks allows inflammation to subside, minimizing perforation risk.

Consult surgery for elective resection

Removes the diseased segment of the sigmoid colon in a controlled, single-stage operation.

Patients who survive an episode of complicated diverticulitis are at high risk for recurrence, making elective resection the definitive long-term treatment.

Anahtar Kavram

Management algorithm for acute complicated diverticulitis with abscess formation

Tahmini Süre:2m 30s

Soru 7400Soru →

A 64-year-old woman presents to the emergency department with a 3-day history of progressively worsening shortness of breath and a dry cough. She has a 35-pack-year smoking history and a history of an anterior myocardial infarction 4 years ago. On physical examination, her blood pressure is 155/90 mmHg, heart rate is 102/min, and respiratory rate is 22/min. Oxygen saturation is 89% on room air. Lung auscultation reveals diffuse expiratory wheezes bilaterally and prolonged expiration. Cardiac auscultation reveals a regular rhythm with an audible S3 gallop. She has 2+ pitting edema in both lower extremities. Which of the following laboratory findings is most useful to differentiate the primary cause of this patient's respiratory symptoms from a chronic obstructive pulmonary disease (COPD) exacerbation?

Elevated serum B-type natriuretic peptide level

Increased arterial partial pressure of carbon dioxide

Elevated serum procalcitonin level

Decreased arterial partial pressure of oxygen

Elevated peripheral blood eosinophil count

Cevabı ve açıklamayı göster

Cevap: Elevated serum B-type natriuretic peptide level

Cevap

Elevated serum B-type natriuretic peptide level

B-type natriuretic peptide (BNP) is a neurohormone synthesized and released by the ventricular myocardium in response to increased wall tension and stretch, which occur in states of volume overload. In patients presenting with acute dyspnea and wheezing who have risk factors for both pulmonary and cardiac disease, an elevated BNP level is highly sensitive and specific for establishing a diagnosis of acute decompensated heart failure. It effectively differentiates cardiogenic pulmonary edema (which can cause wheezing, often termed 'cardiac asthma') from a primary chronic obstructive pulmonary disease (COPD) exacerbation.

Adım Adım Çözüm

Identify the overlapping clinical features in the presentation.

The patient has wheezing, dyspnea, and a smoking history (suggesting COPD), but also has an S3 gallop, peripheral edema, and a history of myocardial infarction (suggesting heart failure).

Recognizing that 'cardiac asthma' (wheezing due to pulmonary edema) can perfectly mimic a COPD exacerbation is essential for selecting the correct diagnostic path.

Evaluate which laboratory marker isolates the cardiac etiology.

Select B-type natriuretic peptide (BNP).

BNP is released from ventricular myocytes directly in response to volume expansion and pressure overload, distinguishing cardiogenic pulmonary edema from primary pulmonary disease.

Anahtar Kavram

Differentiating acute decompensated heart failure from COPD exacerbation using B-type natriuretic peptide (BNP).

Tahmini Süre:45s

ÖncekiSayfa 370 / 414Sonraki

Tüm alıştırma soruları

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Cevap

Adım Adım Çözüm

Anahtar Kavram