All practice questions

1687 questions

All types8,270 Multiple choice4,249 Multiple select325 Numeric160 Matching1,849 Ordering1,687

A 26-year-old woman is evaluated in the sleep clinic for a 1-year history of irresistible daytime sleep attacks. She reports frequently falling asleep during meetings and while driving. Additionally, she experiences vivid, frightening hallucinations just as she is falling asleep, and transient periods of bilateral leg weakness triggered by sudden laughter. She takes no medications and her physical examination is unremarkable. Arrange the following steps in the most appropriate chronological sequence for the diagnostic evaluation and step-wise pharmacological management of this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Review a two-week sleep diary, 2) Conduct an overnight polysomnography, 3) Perform a Multiple Sleep Latency Test (MSLT), 4) Initiate modafinil, 5) Add venlafaxine.

The evaluation of suspected narcolepsy type 1 begins with a sleep diary to verify that excessive daytime sleepiness is not simply due to chronic sleep deprivation. Next, an overnight polysomnography (PSG) is strictly required to rule out other sleep disorders (e.g., sleep apnea) and to document at least 6 hours of sleep. The following day, a Multiple Sleep Latency Test (MSLT) is performed to objectively confirm narcolepsy by demonstrating a mean sleep latency of less than 8 minutes and at least two sleep-onset REM periods. Therapeutically, the stepwise approach first addresses excessive daytime sleepiness with a wake-promoting agent like modafinil. Once daytime wakefulness is improved, targeted therapy for cataplexy (emotionally triggered muscle weakness) is added using an REM-suppressing medication such as an SNRI (e.g., venlafaxine).

Step-by-Step Solution

Evaluate the initial diagnostic requirement.

A sleep diary is reviewed.

To establish baseline sleep-wake patterns and rule out chronic sleep deprivation or circadian rhythm disorders prior to formal objective testing.

Determine the first objective diagnostic study.

Overnight polysomnography is conducted.

To rule out co-occurring sleep disorders such as obstructive sleep apnea and to confirm the patient has slept enough (at least 6 hours) to validate subsequent daytime testing.

Determine the confirmatory diagnostic test.

Multiple Sleep Latency Test (MSLT) is performed.

Conducted the day after polysomnography to detect a shortened sleep latency (under 8 minutes) and at least two sleep-onset REM periods (SOREMPs), which confirms narcolepsy.

Establish the initial pharmacological intervention.

Modafinil is prescribed.

Wake-promoting agents are the first-line treatment for managing excessive daytime sleepiness, which is generally the most pervasive and debilitating symptom.

Address the patient's cataplexy.

Venlafaxine is added to the regimen.

An SNRI strongly suppresses REM sleep and is highly effective at preventing the emotionally triggered sudden loss of muscle tone (cataplexy) seen in narcolepsy type 1.

Key Concept

Diagnosis and Stepwise Management of Narcolepsy Type 1

Question 1082Question →

A 42-year-old man presents to the psychiatric clinic for the management of a newly diagnosed major depressive disorder (MDD). Over the next 18 months, his clinical course is characterized by significant treatment resistance, eventually leading to a severe exacerbation with psychotic features and food refusal. Arrange the following therapeutic interventions in the correct chronological order according to standard stepped-care pharmacologic and somatic treatment guidelines for MDD, starting from his initial presentation to his most severe exacerbation.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence of treatment escalation for major depressive disorder is: 1) initial SSRI/SNRI monotherapy, 2) switching to an alternative monotherapy upon non-response, 3) augmentation with a secondary agent (e.g., atypical antipsychotic) for partial response, and finally 4) electroconvulsive therapy for severe, treatment-resistant, or psychotic depression.

The correct sequence follows the evidence-based stepped-care model for MDD: initial monotherapy, switching monotherapies if there is no response, utilizing augmentation strategies if there is a partial response, and reserving electroconvulsive therapy for severe, refractory, or psychotic cases.

Step-by-Step Solution

Identify the standard first-line treatment for uncomplicated MDD.

Initiation of SSRI monotherapy.

SSRIs have a favorable side effect profile and are the standard initial pharmacotherapy for MDD.

Determine the next step for a patient with zero response to an adequate initial trial.

Switching to a different antidepressant (e.g., SNRI).

Non-responders benefit more from switching to a different agent, whereas partial responders are candidates for augmentation.

Determine the management for a patient showing partial response to a subsequent monotherapy.

Augmentation with a second-generation antipsychotic or lithium.

Augmentation strategies build upon the partial efficacy of the current regimen to achieve remission in treatment-resistant cases.

Identify the definitive treatment for severe depression with life-threatening psychotic features.

Electroconvulsive therapy (ECT).

ECT provides rapid, highly effective relief for psychotic depression and when a patient's health is acutely compromised (e.g., food refusal).

Key Concept

The stepped-care approach to Major Depressive Disorder escalates from initial monotherapy, to switching agents for non-response, to augmentation for partial response, and ultimately to electroconvulsive therapy for refractory or psychotic depression.

Question 1083Question →

A 58-year-old woman is evaluated in the hospital for a fever of 39.2°C (102.6°F), scleral icterus, and severe right upper quadrant abdominal pain. Her blood pressure is 100/60 mmHg and her heart rate is 110/min. Laboratory studies demonstrate a significant leukocytosis, conjugated hyperbilirubinemia, and markedly elevated alkaline phosphatase. Arrange the following steps in the most appropriate chronological sequence for the management of this patient's condition.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: initial medical stabilization with intravenous fluids and broad-spectrum antibiotics, followed by non-invasive imaging with an abdominal ultrasound, then urgent biliary decompression via ERCP, and finally definitive surgical management with a laparoscopic cholecystectomy.

The patient presents with the classic Charcot triad (fever, jaundice, and right upper quadrant abdominal pain), which is highly suspicious for acute ascending cholangitis. Given her tachycardia and borderline hypotension, she is at high risk for progressing to septic shock (Reynolds pentad). The universally accepted, evidence-based sequence of management begins with immediate hemodynamic stabilization, including the administration of intravenous crystalloids and broad-spectrum antibiotics (after drawing blood cultures). Once medical resuscitation is underway, an abdominal ultrasound is the fastest, safest, and most appropriate initial imaging modality to confirm common bile duct dilation. Following diagnostic confirmation, the source of the infection must be controlled via urgent biliary decompression, which is most safely and effectively achieved with an ERCP. Finally, once the patient has clinically recovered from the acute illness, an elective laparoscopic cholecystectomy is performed during the same admission or shortly thereafter to definitively remove the source of the gallstones and prevent future attacks.

Step-by-Step Solution

Stabilize the patient hemodynamically and treat the infection systemically.

Intravenous fluids and broad-spectrum antibiotics are administered.

The patient presents with Charcot triad and signs of systemic toxicity, requiring immediate resuscitation prior to any imaging or intervention.

Confirm the diagnosis using the most appropriate initial imaging modality.

An abdominal ultrasound is performed.

Ultrasound is the best initial test to quickly and safely identify biliary dilation and gallstones at the bedside.

Decompress the obstructed and infected biliary system.

An ERCP with sphincterotomy is performed.

Purulent material must be drained from the common bile duct to adequately control the source of the infection.

Prevent future occurrences of gallstone-related complications.

A laparoscopic cholecystectomy is performed.

Removing the gallbladder eliminates the source of the gallstones, but this should only be done after the acute cholangitis has resolved.

Key Concept

Management sequence for acute ascending cholangitis

Question 1084Question →

A 35-year-old woman is being managed for cocaine use disorder over a period of three years. Her readiness to modify her substance use behavior fluctuates over time. According to the Transtheoretical Model of Change, arrange the following patient statements in the expected chronological progression from the earliest stage of behavior change to the latest.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological progression through the Stages of Change is: Precontemplation, Contemplation, Preparation, Action, and finally Maintenance.

The Transtheoretical Model of Change describes a sequential process of behavioral modification, particularly useful in assessing a patient's readiness for substance use disorder treatment. The stages progress from Precontemplation (not recognizing the problem), to Contemplation (recognizing the problem but ambivalent about change), to Preparation (intending to take action and taking small steps), to Action (making specific, overt modifications in lifestyle), and finally to Maintenance (working to prevent relapse and consolidate gains).

Step-by-Step Solution

Analyze the question requirements.

The question asks to order statements according to the Transtheoretical Model of Change.

This model describes the sequential stages individuals progress through when modifying addictive behaviors.

Categorize each statement.

Statement 1 is Precontemplation (denial). Statement 2 is Contemplation (ambivalence). Statement 3 is Preparation (planning). Statement 4 is Action (recent abstinence). Statement 5 is Maintenance (sustained abstinence).

Matching the clinical quotes to the defining characteristics of each stage ensures accurate categorization.

Sequence the categorized statements.

The correct sequence is Precontemplation -> Contemplation -> Preparation -> Action -> Maintenance.

This represents the classic progression from lacking awareness of a problem to achieving long-term recovery.

Key Concept

Transtheoretical Model (Stages of Change) in Substance Use Disorders

Question 1085Question →

A 35-year-old man is brought to the emergency department after being rescued from a closed-space house fire. On arrival, he is agitated and in respiratory distress. His vital signs are temperature 37.0°C (98.6°F), blood pressure 110/70 mmHg, heart rate 115/min, and respiratory rate 26/min. Physical examination reveals full-thickness burns involving his anterior trunk and both upper extremities. He has soot in his oropharynx, singed nasal vibrissae, and a hoarse voice. Arrange the following steps in the most appropriate chronological order for the acute management of this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is endotracheal intubation, followed by establishing intravenous access, initiating fluid resuscitation, inserting a Foley catheter, and finally performing local wound care.

The sequence of interventions in trauma and severe burn patients strictly follows the Advanced Trauma Life Support (ATLS) protocol: Airway, Breathing, Circulation, Disability, and Exposure (ABCDE). This patient presents with clinical signs of inhalation injury (hoarseness, singed vibrissae, soot), which carries a high risk of rapid, irreversible airway edema. Therefore, early endotracheal intubation (Airway) is the first and most critical step. Once the airway is protected, focus shifts to Circulation. Severe burns cause massive capillary leak and hypovolemia, requiring establishing large-bore IV access followed immediately by crystalloid resuscitation (e.g., Parkland formula). To evaluate the adequacy of this resuscitation, a Foley catheter is inserted to measure hourly urine output. Finally, once life-threatening systemic issues are managed, attention turns to Exposure/Environment, which includes debridement and application of topical antimicrobials to the burn wounds.

Step-by-Step Solution

Assess the airway for impending obstruction.

Endotracheal intubation is selected as the first step.

Hoarseness, singed vibrissae, soot, and a closed-space fire indicate inhalation injury. Early intubation is required before progressive edema makes the airway completely inaccessible.

Address circulation by obtaining vascular access.

Large-bore IV access is established.

With the airway secured, the next ATLS priority is Circulation, which requires robust venous access for fluid administration.

Initiate calculated fluid resuscitation.

Lactated Ringer's infusion is started.

Extensive burns lead to massive fluid shifts and hypovolemic shock. Immediate crystalloid resuscitation is necessary to maintain end-organ perfusion.

Establish a method to monitor resuscitation efficacy.

A Foley catheter is inserted.

Urine output must be monitored closely to titrate the IV fluid rate up or down, ensuring adequate tissue perfusion without causing fluid overload.

Address the burn wounds.

Topical antimicrobials and dressings are applied.

Local wound care prevents infection and fluid loss but is a secondary priority compared to stabilizing the patient's airway and hemodynamics.

Key Concept

Acute burn management follows the ATLS ABCDE algorithm, requiring early intubation for inhalation injury before progressing to fluid resuscitation and lastly wound care.

Question 1086Question →

A 71-year-old man is evaluated on the surgical ward immediately after experiencing a sudden "tearing" sensation in his abdomen during a severe bout of coughing. He is on postoperative day 6 following an open sigmoid resection for complicated diverticulitis. His temperature is $37.2^\circ\text{C}$ ( $99.0^\circ\text{F}$ ), blood pressure is $112/74\text{ mmHg}$ , and pulse is $102/\text{min}$ . When the abdominal binder and surgical dressings are removed, a large volume of serosanguineous fluid is noted, and loops of small intestine are visibly protruding through the separated midline fascial defect.

Arrange the following next steps in the most appropriate chronological sequence for managing this patient's acute complication.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence for managing abdominal evisceration is to first reduce abdominal tension by positioning the patient supine with flexed knees, followed by protecting the exposed bowel with moist sterile dressings, then initiating medical preparation with intravenous fluids and antibiotics, and finally transporting the patient to the operating room for definitive surgical closure.

Abdominal evisceration is a surgical emergency characterized by disruption of all layers of the abdominal wall with protrusion of intra-abdominal organs, often triggered by a sudden increase in intra-abdominal pressure (e.g., severe coughing). The most critical immediate goal is to prevent further evisceration and bowel ischemia. Positioning the patient supine with hips and knees flexed relaxes the abdominal musculature and reduces intra-abdominal pressure. Next, the exposed bowel must be covered with sterile, warm, saline-moistened dressings to prevent tissue desiccation and necrosis. Once the bowel is protected, the patient is hemodynamically stabilized and prepped with intravenous fluids and broad-spectrum antibiotics. Finally, the patient must be urgently transported to the operating room for formal surgical exploration, peritoneal washout, and fascial closure.

Step-by-Step Solution

Relieve abdominal tension

Patient positioned supine with hips and knees flexed

Relaxes the rectus abdominis muscles and decreases intra-abdominal pressure, preventing further evisceration.

Protect exposed viscera

Bowel covered with sterile, warm saline-soaked dressings

Prevents severe tissue desiccation, limits contamination, and maintains bowel viability while awaiting surgery.

Medical optimization

Intravenous fluids and broad-spectrum antibiotics administered

Prepares the patient hemodynamically for emergency surgery and provides necessary infection prophylaxis.

Definitive management

Patient transferred to the operating room

Allows for safe exploration, abdominal washout, and secure fascial closure under controlled conditions.

Key Concept

Acute management of postoperative abdominal evisceration

Question 1087Question →

A $65$ -year-old man is evaluated in the surgical intensive care unit for sudden-onset severe dyspnea, diaphoresis, and right-sided chest pain. He is currently on postoperative day $3$ following an open radical retropubic prostatectomy for localized prostate cancer. His temperature is $37.2^\circ\text{C}$ ( $99.0^\circ\text{F}$ ), blood pressure is $76/45\text{ mm Hg}$ , pulse is $132/\text{min}$ , and respiratory rate is $28/\text{min}$ . Pulse oximetry shows an oxygen saturation of $82\%$ on room air. Physical examination reveals prominent jugular venous distention and a loud pulmonary component of the second heart sound ( $P_2$ ). Bilateral breath sounds are clear to auscultation. An electrocardiogram shows sinus tachycardia with a new-onset right bundle branch block. The patient remains persistently hypotensive despite the rapid administration of $1\text{ L}$ of intravenous normal saline.

Arrange the following management steps in the most appropriate chronological sequence for this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Administer high-flow supplemental oxygen, 2) Perform bedside transthoracic echocardiography, 3) Initiate intravenous unfractionated heparin, 4) Arrange for catheter-directed mechanical thrombectomy.

The correct chronological management of massive pulmonary embolism in a high-bleeding-risk postoperative patient requires step-wise stabilization, bedside diagnosis, and contraindication-aware therapy. First, high-flow oxygen is provided immediately to address hypoxia. Second, because the patient is too unstable for a CT scan, bedside echocardiography is used to visualize right ventricular strain. Third, upon presumptive confirmation, intravenous unfractionated heparin is started to halt thrombus propagation; UFH is chosen for its rapid reversibility. Finally, because the recent major surgery is an absolute contraindication to systemic thrombolysis, mechanical thrombectomy is arranged for definitive treatment.

Step-by-Step Solution

Administer high-flow supplemental oxygen

Improves hypoxemia and provides initial stabilization.

Airway and breathing management (ABCs) is the universal first step in any hemodynamically unstable patient with acute respiratory distress.

Perform bedside transthoracic echocardiography

Identifies right ventricular dilation, septal flattening, or McConnell's sign, establishing a presumptive diagnosis of massive PE.

The patient is too unstable for a CT pulmonary angiogram. Bedside echo is the most appropriate diagnostic test to confirm RV strain before committing a high-bleeding-risk patient to anticoagulation.

Initiate continuous intravenous infusion of unfractionated heparin

Prevents further thrombus propagation.

Once the diagnosis is presumptively confirmed by echo, anticoagulation must begin immediately. UFH is preferred in post-operative patients due to its rapid onset, short half-life, and reversibility with protamine.

Arrange for emergency catheter-directed mechanical thrombectomy

Physically removes the thrombus to relieve right ventricular outflow obstruction and restore cardiac output.

Systemic thrombolysis (e.g., tPA) is the standard treatment for massive PE, but recent major surgery (within 3 weeks) is an absolute contraindication. Mechanical extraction is required.

Key Concept

Algorithm for Massive Pulmonary Embolism in the Postoperative Setting

Alternative Method

Surgical pulmonary embolectomy via median sternotomy is an equally valid alternative to catheter-directed mechanical thrombectomy in this scenario, depending on institutional availability and surgical expertise.

Estimated Time:1m 30s

Question 1088Question →

During surgical rounds, the attending physician discusses the classic timeline of postoperative complications with the medical team. Arrange the following common etiologies of postoperative fever in the chronological order they typically present, from earliest (postoperative day 1) to latest (postoperative day 7).

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The chronological sequence for classic postoperative fever etiologies is: Atelectasis (earliest), followed by Catheter-associated urinary tract infection, Deep vein thrombosis, and finally Surgical site infection (latest).

The correct chronological order follows the classic timeline framework for postoperative fever etiologies. 'Wind' (atelectasis and generalized inflammation) occurs on Postoperative Days 1-2. 'Water' (urinary tract infections) occurs on Postoperative Days 3-5. 'Walking' (venous thromboembolism such as deep vein thrombosis) presents on Postoperative Days 4-6. Finally, 'Wound' (surgical site infections) presents on Postoperative Days 5-7. Recognizing this timeline is fundamental for directing the initial diagnostic workup in a postoperative patient with new-onset fever.

Step-by-Step Solution

Identify the earliest cause of postoperative fever (Postoperative Days 1-2).

Atelectasis and inflammatory cytokine release.

The physiologic stress of surgery and early hypoventilation cause cytokine release and atelectasis almost immediately after surgery.

Identify the next complication in the timeline (Postoperative Days 3-5).

Catheter-associated urinary tract infection.

Urinary stasis and colonization associated with indwelling urinary catheters take a few days to develop into a symptomatic infection.

Identify the third complication in the sequence (Postoperative Days 4-6).

Deep vein thrombosis.

Immobilization leads to venous stasis, taking several days to form a clinically significant venous thromboembolism.

Identify the latest complication in this sequence (Postoperative Days 5-7).

Surgical site infection.

Surgical site infections require sufficient time for bacterial inoculation to replicate and produce clinical signs such as purulence and erythema.

Key Concept

The classic chronological presentation of postoperative fever, commonly remembered by the mnemonic 'Wind, Water, Walking, Wound'.

Question 1089Question →

A 28-year-old construction worker is brought to the emergency department after a heavy concrete beam fell on his pelvis. His blood pressure is 118/76 mmHg and heart rate is 92/min. Primary survey reveals a patent airway and clear lungs. A pelvic binder is applied. Physical examination reveals a scrotal hematoma and blood at the urethral meatus. Arrange the following diagnostic and therapeutic steps in the correct chronological sequence to appropriately evaluate and manage this patient, assuming findings lead to the diagnosis and treatment of an intraperitoneal bladder rupture.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological sequence is: 1) Perform a FAST examination, 2) Obtain a retrograde urethrogram, 3) Insert a transurethral Foley catheter, 4) Perform a CT cystogram, 5) Perform an exploratory laparotomy.

The algorithm for pelvic trauma with suspected urologic injury follows ATLS priorities. The FAST exam is an initial primary survey adjunct. Following this, the sequence of urologic evaluation is strictly dictated by anatomic progression and safety: the urethra must be evaluated (retrograde urethrogram) before a catheter can be placed. Once the catheter is placed, the bladder can be evaluated with contrast (CT cystogram). Finally, the diagnosis of an intraperitoneal rupture dictates operative management (exploratory laparotomy).

Step-by-Step Solution

Perform a FAST examination

Assesses for hemoperitoneum.

According to ATLS protocols, ruling out massive intra-abdominal hemorrhage is part of the initial primary survey adjuncts, prior to focused urologic workup.

Obtain a retrograde urethrogram

Evaluates the integrity of the urethra.

Blood at the urethral meatus is an absolute contraindication to blind urethral catheterization. The urethra must be visualized first to avoid converting a partial tear into a complete transection.

Insert a transurethral Foley catheter

Allows for bladder decompression and evaluation of urine.

After the urethra is cleared by the retrograde urethrogram, a catheter is necessary to monitor urine output and identify gross hematuria, which indicates potential bladder injury.

Perform a computed tomography (CT) cystogram

Identifies the presence and location of a bladder rupture.

Gross hematuria in the setting of a pelvic fracture mandates imaging of the bladder to differentiate between extraperitoneal and intraperitoneal ruptures.

Perform an exploratory laparotomy

Surgically repairs the bladder defect.

Unlike extraperitoneal ruptures which can often be managed with catheter drainage alone, intraperitoneal bladder ruptures leak urine into the peritoneal cavity and require urgent operative repair.

Key Concept

Sequential ATLS management of pelvic trauma complicated by suspected urologic injury.

Estimated Time:1m 30s

Question 1090Question →

A 64-year-old woman is evaluated in the emergency department 12 days after undergoing a coronary artery bypass grafting (CABG) procedure. She reports a 2-day history of increasing retrosternal pain, fever, and profound fatigue. Her temperature is 38.8°C (101.8°F), heart rate is 112/min, blood pressure is 105/65 mmHg, and respiratory rate is 18/min. Physical examination reveals erythema, induration, and a small amount of purulent drainage from the inferior aspect of the sternotomy incision. A palpable 'click' and abnormal movement are felt over the sternum during respiration. Arrange the following management steps in the most appropriate chronological order.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological sequence for managing acute postoperative mediastinitis is to first obtain microbiological cultures, immediately follow with empiric broad-spectrum intravenous antibiotics, then obtain a computed tomography (CT) scan of the chest to delineate the infection, and finally proceed with definitive surgical exploration and debridement.

The presentation of fever, purulent wound drainage, and a 'clicking' sternum 12 days post-CABG is highly suspicious for acute postoperative mediastinitis complicated by sternal dehiscence. The standard of care mandates a strict chronological sequence to optimize patient outcomes. First, blood and deep wound cultures must be collected to ensure the causative organism (typically Gram-positive cocci such as Staphylococcus aureus or epidermidis) can be identified. Second, empiric broad-spectrum intravenous antibiotics are administered immediately after cultures to treat the severe systemic infection. Third, a CT scan of the chest is performed to evaluate the mediastinum for fluid collections and the extent of bone involvement, which directly guides the operative plan. Finally, urgent surgical exploration is performed to achieve definitive source control through rigorous debridement of necrotic bone and tissue, followed by stabilization or vascularized muscle flap reconstruction.

Step-by-Step Solution

Identify acute postoperative mediastinitis with sternal dehiscence.

Recognize the clinical triad of fever, purulent sternal drainage, and sternal instability (clicking) in a post-cardiac surgery patient.

This is a life-threatening complication that requires immediate, protocolized medical and surgical intervention.

Prioritize microbiological yield before medical therapy.

Obtain blood and deep wound cultures.

Pathogen identification is required for targeted therapy and must be completed before antibiotics obscure the microbiological results.

Initiate acute systemic sepsis treatment.

Administer empiric broad-spectrum intravenous antibiotics.

To rapidly control the systemic infection and prevent clinical deterioration into hemodynamic instability.

Define the anatomical involvement of the infection.

Obtain a chest CT scan.

Imaging is necessary to guide the surgical approach by identifying retrosternal abscesses or undrained fluid collections.

Perform definitive source control.

Proceed to the operating room for surgical exploration.

Surgical source control via extensive debridement of necrotic bone and tissue, followed by sternal rewiring or flap closure, is the only curative intervention for deep sternal wound infections.

Key Concept

The management of acute postoperative mediastinitis requires a rapid, standardized sequence: obtain cultures, initiate broad-spectrum antibiotics, obtain cross-sectional imaging for operative planning, and perform definitive surgical debridement.

Question 1091Question →

A 22-year-old man is brought to the trauma bay after being struck by a car while crossing the street. He is moaning in pain and has visible bruising on his chest and abdomen. According to the Advanced Trauma Life Support (ATLS) protocol, arrange the following initial assessment and management steps in the correct chronological order.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological sequence follows the ATLS primary survey ABCDE approach: Airway, Breathing, Circulation, Disability, and Exposure.

The Advanced Trauma Life Support (ATLS) protocol mandates a structured, sequential approach to trauma patients to identify and treat the most immediate life-threatening conditions first. This follows the established ABCDE algorithm: Airway (with cervical spine protection), Breathing (ventilation and oxygenation), Circulation (hemorrhage control and perfusion), Disability (neurologic status), and Exposure (complete examination and environmental control). Skipping steps can lead to fatal consequences, such as failing to recognize hypoxia before addressing a bleeding wound.

Step-by-Step Solution

Identify the first priority in trauma resuscitation.

Airway with cervical spine protection.

Securing the airway and preventing further cervical spine injury prevents immediate death from hypoxia and spinal cord damage.

Identify the second priority.

Breathing and ventilation.

Once the airway is secure, adequate oxygenation and ventilation must be confirmed, and life-threatening conditions like tension pneumothorax ruled out.

Identify the third priority.

Circulation with hemorrhage control.

With a secure airway and adequate ventilation, the next most immediate threat to life is hemorrhagic shock, requiring vascular access and bleeding control.

Identify the fourth priority.

Disability (neurologic status).

A rapid neurologic exam establishes a baseline and identifies potential traumatic brain injury or increased intracranial pressure.

Identify the fifth priority.

Exposure and environmental control.

The patient must be completely undressed to find all injuries, but hypothermia must be prevented simultaneously.

Key Concept

Advanced Trauma Life Support (ATLS) Primary Survey Sequence

Question 1092Question →

A 45-year-old man is admitted to the intensive care unit with severe acute gallstone pancreatitis. After initial improvement with aggressive fluid resuscitation and supportive care, he develops a new-onset fever of 39.4°C (102.9°F), leukocytosis of 18,000/mm³, and increasing abdominal pain on hospital day 14. He remains hemodynamically stable. Assuming each intervention is indicated by the findings or clinical failure of the preceding step, arrange the following management steps in the most appropriate 'step-up' sequence for this patient's suspected complication.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence for managing suspected infected pancreatic necrosis begins with diagnostic confirmation via CT scan, followed by the therapeutic 'step-up' approach: percutaneous drainage, then minimally invasive necrosectomy, and finally open necrosectomy only if necessary.

The standard of care for infected pancreatic necrosis follows the 'step-up' approach to minimize surgical trauma in critically ill patients. It begins with diagnostic confirmation (CT scan with IV contrast). Therapeutic intervention starts with the least invasive method: percutaneous image-guided drainage. If clinical improvement does not occur (typically reassessed at 72 hours), the next step is minimally invasive necrosectomy using the established drain tract. Open surgical necrosectomy is utilized only if less invasive methods fail, as it carries the highest risk of major complications (e.g., bleeding, fistulas, organ failure).

Step-by-Step Solution

Evaluate the patient's new-onset fever and leukocytosis 14 days after a severe acute pancreatitis episode.

Clinical suspicion for infected pancreatic necrosis is established.

Infected necrosis typically presents 2 to 4 weeks after the initial attack of severe acute pancreatitis with signs of clinical deterioration and sepsis.

Perform a contrast-enhanced CT of the abdomen.

Confirms the presence of necrosis and detects retroperitoneal gas or fluid collections.

Imaging is mandatory to verify the diagnosis and plan the safest route for intervention before any procedural step is taken.

Place an image-guided percutaneous drain into the infected collection.

Achieves initial source control and allows drainage of purulent fluid.

This is the first intervention in the evidence-based 'step-up' approach, successfully treating the infection without any surgery in approximately 35% of patients.

Perform a minimally invasive retroperitoneal necrosectomy (e.g., VARD) if the patient deteriorates or fails to improve.

Mechanically debrides solid necrotic tissue that cannot pass through a standard percutaneous drain.

This is indicated when the patient fails to clinically improve after 72 hours of percutaneous drainage, utilizing the existing drain tract for access.

Proceed to open surgical necrosectomy.

Provides maximal exposure for complete debridement and lavage.

Reserved strictly as a final resort due to the high rates of morbidity, including enterocutaneous fistulas and severe systemic stress, associated with open abdominal surgery in this setting.

Key Concept

The 'step-up' approach for the management of infected pancreatic necrosis

Question 1093Question →

A 74-year-old man is brought to the emergency department after passing a large volume of bright red blood per rectum at home. Upon arrival, he is confused and diaphoretic. His blood pressure is 82/50 mm Hg, and his heart rate is 125/min. His abdomen is soft, non-tender, and non-distended. Digital rectal examination reveals copious gross bright red blood. He has a history of hypertension, hyperlipidemia, and osteoarthritis. Arrange the following interventions in the most appropriate sequence for the management of this patient's acute life-threatening hemorrhage.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct management sequence is: Resuscitation first, followed by EGD to rule out an upper GI source, then CT Angiography to localize the lower bleed, followed by Catheter Angiography with Embolization for treatment, and finally Surgery as a last resort.

The algorithm for massive, unstable hematochezia dictates that resuscitation is the universal first step. Once volume replacement is initiated, an EGD must be performed to quickly rule out a life-threatening upper GI bleed, which accounts for 10-15% of cases presenting with severe hematochezia. If EGD is negative, non-invasive localization with CT angiography is the next best step, as it can detect rapid bleeding without requiring bowel preparation. Following localization, catheter-directed angiography allows for targeted embolization. Emergent colectomy carries high morbidity and mortality and is reserved strictly for refractory cases where embolization fails.

Step-by-Step Solution

Initiate aggressive fluid resuscitation and blood transfusion via large-bore intravenous access.

Restores intravascular volume and improves hemodynamics.

The patient is in hemorrhagic shock (hypotension, tachycardia, confusion); immediate stabilization is required before any diagnostic studies.

Perform an esophagogastroduodenoscopy (EGD) to rule out an upper gastrointestinal source.

Excludes peptic ulcer disease or variceal hemorrhage as the source of massive hematochezia.

Brisk upper GI bleeding can transit the bowel rapidly and present as bright red blood per rectum, especially in patients with hemodynamic instability.

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

Localizes the precise site of lower gastrointestinal hemorrhage.

Unprepared colonoscopy is technically difficult and often non-diagnostic in massive, active bleeding. CTA is fast and detects bleeding rates as low as 0.3 mL/min.

Perform catheter-directed mesenteric angiography with targeted embolization.

Achieves hemostasis without the need for major abdominal surgery.

Once localized by CTA, selective embolization provides definitive control with lower morbidity than surgery.

Proceed to an emergent exploratory laparotomy with segmental or subtotal colectomy.

Surgically removes the bleeding source.

Surgical intervention is the definitive treatment of last resort if minimally invasive techniques fail or the patient deteriorates rapidly despite maximal resuscitation.

Key Concept

Algorithm for the management of massive, hemodynamically unstable lower gastrointestinal bleeding.

Question 1094Question →

A 28-year-old military contractor is brought to the trauma bay immediately after an improvised explosive device (IED) blast. On arrival, bright red blood is vigorously spurting from a right mid-thigh amputation. The patient has agonal respirations, severe maxillofacial crush injuries, and a hoarse, gurgling voice. Physical examination reveals absent breath sounds on the left hemithorax with distended neck veins. His blood pressure is undetectable, and his heart rate is 145/min. Arrange the following critical management steps in the correct chronological order according to the Advanced Trauma Life Support (ATLS) primary survey protocol.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: Application of a proximal arterial tourniquet, followed by Establishment of a definitive airway, then Decompression of the left pleural space, followed by Initiation of massive transfusion protocol, and finally Assessment of pupillary response and motor function.

The Advanced Trauma Life Support (ATLS) 10th edition protocol utilizes the <C>ABCDE algorithm, emphasizing that Catastrophic external hemorrhage (<C>) must be addressed prior to Airway (A). If a patient has massive, life-threatening external bleeding (such as a spurting amputation), attempting any other intervention before applying a tourniquet or direct pressure will result in exsanguination. Following catastrophic hemorrhage control, the standard sequence resumes: Airway maintenance with cervical spine restriction (managing the maxillofacial trauma), Breathing and ventilation (addressing the tension pneumothorax), Circulation (intravenous access and massive transfusion for shock), and Disability (neurologic evaluation).

Step-by-Step Solution

Identify the most immediate threat to life based on the <C>ABCDE protocol.

The vigorously spurting right mid-thigh amputation represents catastrophic external hemorrhage.

Massive arterial bleeding will cause fatal exsanguination within seconds to minutes, preceding death from airway loss. This must be addressed first with a tourniquet.

Assess and secure the airway while maintaining cervical spine restriction.

The maxillofacial crush injury and agonal respirations necessitate a definitive airway (e.g., surgical cricothyroidotomy or endotracheal intubation).

Once exsanguination is halted, hypoxia from an unprotected or obstructed airway is the next most rapid cause of death.

Evaluate breathing and manage impaired ventilation.

Absent left breath sounds and distended neck veins are diagnostic of a tension pneumothorax, requiring immediate thoracostomy.

A tension pneumothorax severely impairs both ventilation and venous return, and must be decompressed immediately after the airway is secured.

Assess systemic circulation and initiate volume resuscitation.

The undetectable blood pressure and severe tachycardia require the initiation of a massive transfusion protocol via large-bore access.

Restoring intravascular volume is critical for tissue perfusion, but must follow hemorrhage control, airway, and breathing to ensure oxygenated blood is being circulated.

Perform a baseline neurologic assessment.

Pupillary response and motor function (Disability) are evaluated.

Establishing a baseline neurologic exam dictates further neurosurgical intervention, but can only be accurately assessed once hypoxia and hypotension are addressed.

Key Concept

The ATLS Primary Survey (<C>ABCDE Approach)

Question 1095Question →

A 22-year-old man is diagnosed with schizophrenia after presenting with a seven-month history of auditory hallucinations, disorganized speech, and severe social withdrawal. His physician outlines a long-term pharmacologic treatment strategy, anticipating standard protocols including steps for potential treatment resistance. Arrange the following therapeutic interventions in the most appropriate sequential order, progressing from the initial treatment of a first episode to the management of severe, refractory disease.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: 1) Initiate a first-line antipsychotic monotherapy, 2) Switch to a different first-line antipsychotic monotherapy, 3) Initiate clozapine, and 4) Augment clozapine therapy.

The correct ordering directly reflects the widely accepted psychiatric algorithm for schizophrenia management. Initial intervention requires monotherapy to assess baseline response. A second distinct monotherapy ensures that the lack of response is not specific to the mechanism of the first drug. Failing two adequate trials establishes the diagnosis of treatment-resistant schizophrenia, which strictly mandates a clozapine trial. Finally, if clozapine proves insufficient, augmentation with another antipsychotic, mood stabilizer, or electroconvulsive therapy (ECT) is indicated.

Step-by-Step Solution

Determine the standard first-line treatment for a newly diagnosed patient with schizophrenia.

Initiation of a single second-generation or first-generation antipsychotic.

Monotherapy is always preferred initially to balance symptom control with the lowest possible side effect burden.

Identify the next best step for a patient who fails their first antipsychotic trial.

Switch to a different first-line antipsychotic monotherapy.

A lack of response to one medication does not immediately equal treatment resistance; a second distinct monotherapy trial must be attempted and failed.

Define and manage treatment-resistant schizophrenia.

Initiation of clozapine.

Once a patient fails two adequate trials of different antipsychotics, they meet criteria for treatment-resistant schizophrenia, for which clozapine is the only medication with proven superior efficacy.

Address the management of clozapine-refractory schizophrenia.

Augmentation of clozapine with another agent or ECT.

If an optimized clozapine trial fails, the algorithm culminates in combination therapy or neuromodulation.

Key Concept

Stepwise pharmacologic management algorithm for schizophrenia and treatment-resistant schizophrenia

Estimated Time:1m 0s

Question 1096Question →

A 42-year-old woman is evaluated in the surgical ward on postoperative day 2 following an open total abdominal hysterectomy for large, symptomatic uterine fibroids. Her preoperative hemoglobin was $8.2 \text{ g/dL}$ . Due to symptomatic anemia (fatigue, tachycardia) and a current hemoglobin of $6.8 \text{ g/dL}$ , a transfusion of packed red blood cells is initiated. Twenty minutes into the transfusion, the patient reports sudden-onset severe back pain, chills, and shortness of breath. Her urine in the Foley catheter tubing suddenly appears dark red.

Vital signs are as follows:

Parameter	Value
Temperature	$39.1^\circ \text{C}$ ( $102.4^\circ \text{F}$ )
Blood pressure	$90/60 \text{ mmHg}$
Heart rate	$118/\text{min}$
Respiratory rate	$24/\text{min}$
Oxygen saturation	$94\%$ on room air

Arrange the following steps in the most appropriate chronological order for the immediate management of this patient's condition.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence for managing an acute hemolytic transfusion reaction is: 1) Stop the transfusion immediately, 2) Maintain IV access with completely new tubing and normal saline, 3) Perform a bedside clerical check, 4) Notify the blood bank and send samples for investigation, and 5) Administer aggressive intravenous hydration to prevent acute kidney injury.

The patient is experiencing an acute hemolytic transfusion reaction (AHTR), likely due to ABO incompatibility caused by a clerical error. The immediate sequence of actions must prioritize halting the offending antigen and stabilizing the patient. The very first step is to stop the transfusion. Second, the intravenous line must be kept open to allow for emergency resuscitation; critically, this must be done by completely disconnecting the blood tubing and attaching a new line primed with normal saline, because flushing the old line would push incompatible blood into the patient. Third, a bedside clerical check comparing the blood product to the patient's ID band should be performed, as administrative errors are the most common cause of AHTR. Fourth, the blood bank must be notified and all related materials sent for analysis. Finally, specific medical therapy is initiated, primarily aggressive intravenous hydration with normal saline to induce a brisk diuresis, which helps prevent hemoglobin precipitation in the renal tubules and subsequent acute tubular necrosis.

Step-by-Step Solution

Recognize the clinical presentation of an acute hemolytic transfusion reaction.

Identify that the patient's sudden fever, hypotension, flank pain, and hemoglobinuria during a blood transfusion strongly indicate ABO incompatibility.

Accurate recognition dictates the immediate life-saving algorithmic response.

Stop the transfusion.

Halts the introduction of the incompatible antigen into the bloodstream.

Further exposure to incompatible red blood cells worsens the life-threatening immune response and increases the risk of mortality.

Maintain intravenous access with new tubing and normal saline.

Keeps the vein open for emergency medications and fluids without exposing the patient to more incompatible blood.

The existing tubing contains incompatible red blood cells; flushing it would cause further harm. New tubing must be attached directly to the catheter hub.

Perform a clerical check of the patient's ID and the blood product.

Rapidly identifies potential administrative mismatch errors at the bedside.

ABO incompatibility due to a clerical error (e.g., mislabeling or administering to the wrong patient) is the most common cause of acute hemolytic transfusion reactions.

Notify the blood bank and send necessary samples.

Initiates a formal laboratory investigation and quarantines related blood units.

Required to confirm the diagnosis via direct Coombs testing and to prevent harm to other patients.

Administer aggressive intravenous fluids.

Maintains intravascular volume and promotes vigorous diuresis.

Free hemoglobin from lysed red blood cells can precipitate in the renal tubules, leading to acute tubular necrosis. Aggressive hydration prevents this acute kidney injury.

Key Concept

The immediate management of a suspected acute hemolytic transfusion reaction involves sequentially stopping the transfusion, securing IV access with new tubing (avoiding flushing the old blood), verifying patient identity, notifying the blood bank, and providing aggressive supportive care with intravenous fluids to prevent acute tubular necrosis.

Estimated Time:1m 30s

Question 1097Question →

A 70-year-old man is evaluated in the surgical ward on postoperative day 2 following an elective partial gastrectomy. Over the past 4 hours, his recorded urine output has been 15 mL/hr. He has an indwelling Foley catheter in place. His blood pressure is 105/65 mmHg, heart rate is 98/min, and respiratory rate is 16/min. His mucous membranes appear dry, and his capillary refill time is 3 seconds. Arrange the following steps in the most appropriate chronological sequence for the evaluation and management of this patient's postoperative oliguria.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first inspect the catheter tubing, then flush the catheter, followed by administering an intravenous fluid bolus, and finally obtaining urine electrolytes and a renal ultrasound if oliguria persists.

The algorithmic approach to postoperative oliguria involves systematically ruling out causes from least invasive to most invasive, and from mechanical to physiologic. Confirming catheter patency is paramount before administering fluids, as a blocked catheter will falsely present as oliguria, and giving fluids could lead to harmful bladder distension. Once patency is assured, addressing the most common cause—prerenal hypovolemia—with a fluid challenge is indicated. Intrinsic renal workup is reserved for refractory cases.

Step-by-Step Solution

Rule out external mechanical obstruction.

Inspect the external urinary catheter tubing.

A kinked or compressed catheter is a common, easily reversible cause of apparent oliguria that must be ruled out before any invasive interventions.

Rule out internal mechanical obstruction.

Flush the urinary catheter with sterile normal saline.

If the external tubing is clear, a mucus plug or blood clot within the catheter lumen may be obstructing flow and should be cleared.

Assess and treat intravascular volume status.

Administer an intravenous bolus of isotonic crystalloid fluid.

After confirming the catheter is patent, prerenal hypovolemia (indicated by the patient's dry mucous membranes and tachycardia) is the most likely cause of low urine output.

Investigate intrinsic or post-renal pathology.

Obtain urine electrolytes and a renal ultrasound.

If the patient does not respond to a fluid challenge, acute tubular necrosis or other intrinsic renal injuries must be evaluated.

Key Concept

Algorithmic evaluation of postoperative oliguria

Question 1098Question →

A 44-year-old woman presents to the emergency department with severe, constant right upper quadrant abdominal pain that began 6 hours ago after eating a fast-food meal. She reports nausea and two episodes of bilious vomiting. Her temperature is 38.2°C (100.8°F), heart rate is 102/min, and blood pressure is 118/76 mmHg. Physical examination reveals marked tenderness in the right upper quadrant with sudden inspiratory arrest during deep palpation. Arrange the following management steps in the most appropriate chronological order for this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence of management is: initial resuscitation with intravenous fluids and analgesics, followed by a right upper quadrant ultrasound to confirm the diagnosis, then initiation of intravenous broad-spectrum antibiotics, and finally early laparoscopic cholecystectomy.

The correct sequence for managing suspected acute cholecystitis begins with supportive care, including intravenous fluids to correct dehydration from vomiting and insensible losses due to fever, along with analgesics. Next, the diagnosis must be confirmed; a right upper quadrant abdominal ultrasound is the initial imaging modality of choice. Upon confirmation of acute cholecystitis, the patient should be started on intravenous broad-spectrum antibiotics to control the localized infection. Finally, the definitive treatment is a laparoscopic cholecystectomy, which should ideally be performed during the same hospital admission (early cholecystectomy) to optimize patient outcomes and minimize the risk of recurrent complications.

Step-by-Step Solution

Stabilize the patient with intravenous fluids and provide analgesia.

Improves hemodynamic status and controls pain.

Airway, breathing, circulation (ABCs) and initial stabilization always take precedence in a patient with systemic inflammatory signs (fever, tachycardia) and fluid losses from vomiting.

Obtain a right upper quadrant abdominal ultrasound.

Identifies the presence of gallstones, gallbladder wall thickening, and a sonographic Murphy sign.

An ultrasound is the preferred, most cost-effective initial diagnostic test for suspected biliary pathology.

Administer intravenous broad-spectrum antibiotics.

Treats the underlying infection caused by biliary stasis.

Once the diagnosis is confirmed, prophylactic or therapeutic antibiotics are given prior to surgical intervention to prevent systemic sepsis and surgical site infections.

Perform an early laparoscopic cholecystectomy.

Definitively treats the condition by removing the inflamed gallbladder.

Early cholecystectomy (within 72 hours of presentation) is the standard of care for acute cholecystitis to reduce overall morbidity, readmission rates, and total length of hospital stay.

Key Concept

The standard management sequence for acute cholecystitis involves initial resuscitation, ultrasound confirmation of the diagnosis, initiation of antibiotics, and early surgical intervention.

Question 1099Question →

A 75-year-old man who recently underwent a total hip arthroplasty develops progressive abdominal distension over the past 3 days. He has not passed flatus or stool since the surgery. His current medications include intravenous morphine for pain control. Vital signs are within normal limits. Physical examination shows a massively distended, tympanic abdomen without focal tenderness, guarding, or rigidity. Laboratory studies reveal a serum potassium level of 3.1 mEq/L. Computed tomography of the abdomen and pelvis demonstrates diffuse dilation of the colon with a cecal diameter of 10.5 cm, and no evidence of mechanical obstruction or transition point.

Arrange the following management strategies for this condition in the correct sequential order, from the initial best step to the interventions reserved for refractory or complicated cases.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: Conservative measures -> Neostigmine -> Endoscopic decompression -> Surgical intervention.

The standard step-wise algorithm for acute colonic pseudo-obstruction begins with conservative care to eliminate triggers. If this fails, pharmacologic stimulation with neostigmine is utilized. Endoscopic decompression follows if neostigmine is ineffective or contraindicated. Surgery is the definitive, but most morbid, final option.

Step-by-Step Solution

Identify the diagnosis from the clinical presentation and imaging findings.

The patient has acute colonic pseudo-obstruction (Ogilvie syndrome), characterized by massive colonic dilation without mechanical obstruction. This is often triggered by surgery, trauma, or severe illness, and exacerbated by electrolyte imbalances and narcotics.

Accurate diagnosis is required to apply the correct step-wise management protocol.

Determine the initial management step for an uncomplicated patient.

The first step is conservative therapy, which includes bowel rest, intravenous hydration, correction of electrolyte abnormalities (e.g., hypokalemia), and cessation of offending medications like opioids.

Many cases resolve spontaneously within 24 to 48 hours with these supportive measures alone.

Identify the next intervention if conservative management fails.

Neostigmine is the first-line pharmacologic intervention used when conservative management is unsuccessful.

Neostigmine increases parasympathetic tone to stimulate colonic motility, but it requires continuous cardiac monitoring due to the risk of profound bradycardia.

Determine the role of endoscopic and surgical therapies.

Endoscopic colonic decompression is used if neostigmine fails or is contraindicated. Surgery is reserved for refractory cases or when complications like ischemia occur.

Invasive procedures carry higher risks of morbidity and mortality and are therefore kept as secondary and tertiary options.

Key Concept

The step-wise management of acute colonic pseudo-obstruction (Ogilvie syndrome) progresses from supportive care to pharmacologic, endoscopic, and finally surgical interventions based on clinical response.

Question 1100Question →

A 28-year-old male construction worker is brought to the emergency department after a heavy concrete block fell on his right leg. His airway is patent, breathing is unlabored, and he is hemodynamically stable. The primary trauma survey reveals no other life-threatening injuries. Examination of the right lower extremity shows a 5-centimeter laceration over the anterior tibia with exposed, fragmented bone and moderate oozing of blood. The right foot is warm, with palpable dorsalis pedis and posterior tibial pulses. Motor and sensory exams of the foot are intact. Arrange the following management steps in the most appropriate chronological order.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: Administer IV antibiotics/tetanus, apply a sterile dressing and splint, obtain radiographs, perform OR irrigation and debridement, and finally perform definitive skeletal stabilization.

The management of an open fracture follows a strict chronological protocol to minimize the risk of infection and further injury. After the primary ATLS survey confirms hemodynamic stability, the immediate priority is the administration of intravenous antibiotics and tetanus prophylaxis. Studies show that early administration (ideally within 60 minutes) significantly reduces the risk of osteomyelitis. Next, the wound must be covered with a sterile dressing and the limb immobilized in a splint. Doing this prior to obtaining imaging is crucial; it prevents the sharp bone fragments from causing secondary soft tissue or neurovascular injury during transport. Once the extremity is safely immobilized, orthogonal radiographs are obtained to assess the fracture pattern. The patient is then taken to the operating room for formal surgical irrigation and debridement of all devitalized tissues. Finally, definitive skeletal stabilization (such as intramedullary nailing or external fixation) and soft tissue coverage are performed.

Step-by-Step Solution

Administer intravenous broad-spectrum antibiotics and tetanus prophylaxis.

Infection risk is mitigated.

Early administration of antibiotics (ideally within 1 hour) is the single most important intervention in decreasing the risk of infection in open fractures.

Apply a sterile saline-soaked dressing and immobilize the leg in a splint.

The fracture is protected from further injury.

Splinting immobilizes the sharp bone ends, preventing secondary neurovascular injury, reducing pain, and protecting the soft tissues during patient movement.

Obtain orthogonal radiographs of the right lower extremity.

The fracture pattern is visualized.

Once the limb is protected in a splint, imaging can be safely obtained to evaluate the bony injury and allow for proper surgical planning.

Proceed to the operating room for formal surgical irrigation and debridement.

Contaminants and necrotic tissue are removed.

Thorough surgical debridement of devitalized muscle, skin, and bone is required for all open fractures to prevent deep infection.

Perform definitive skeletal stabilization and soft tissue coverage.

The bone heals in appropriate alignment.

Final stabilization and wound closure conclude the acute management phase, although this step is sometimes staged depending on wound contamination.

Key Concept

Acute management sequence for open fractures

PreviousPage 55 / 85Next

All practice questions

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Alternative Method

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Answer

Step-by-Step Solution