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Cardiovascular System

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Question 281Question →

Match the following clinical presentations and auscultatory findings with their most likely underlying structural or valvular pathology.

Click a left item, then click its matching right item

Items

A 24-year-old woman with palpitations; auscultation shows a mid-systolic click and a late systolic murmur.
A 65-year-old man with exertional syncope; auscultation shows a harsh, crescendo-decrescendo systolic murmur radiating to the carotids.
A 40-year-old immigrant with dyspnea; auscultation shows a loud S1, an opening snap, and a mid-diastolic rumble.
A 70-year-old man with bounding peripheral pulses; auscultation shows an early diastolic decrescendo murmur best heard at the left sternal border.
A 55-year-old man with acute pulmonary edema post-myocardial infarction; auscultation shows a new holosystolic apical murmur radiating to the axilla.

Matches

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Answer

The correct matches align specific murmurs with their structural causes: mid-systolic click with myxomatous degeneration, crescendo-decrescendo murmur with calcific degeneration, opening snap with rheumatic thickening, early diastolic murmur with aortic root dilation, and post-MI holosystolic murmur with papillary muscle rupture.
Each auscultatory finding and clinical scenario is pathognomonic for a specific underlying valvular pathology. Proper matching relies on identifying the timing (systolic vs. diastolic) and the structural consequence (stenosis vs. regurgitation vs. prolapse).

Step-by-Step Solution

1
Analyze the first clinical presentation (mid-systolic click).
Identified as Mitral Valve Prolapse.
The mid-systolic click and late systolic murmur point directly to myxomatous degeneration of the mitral valve.
2
Analyze the second clinical presentation (crescendo-decrescendo).
Identified as Aortic Stenosis.
The harsh crescendo-decrescendo systolic murmur with carotid radiation and exertional syncope is classic for calcific degeneration of the aortic valve.
3
Analyze the third clinical presentation (opening snap).
Identified as Mitral Stenosis.
The opening snap and mid-diastolic rumble in a patient with a likely history of rheumatic fever points to leaflet thickening and commissural fusion.
4
Analyze the fourth clinical presentation (decrescendo with bounding pulses).
Identified as Aortic Regurgitation.
The early diastolic decrescendo murmur and bounding pulses are due to regurgitant flow from aortic root dilation or valvular abnormalities.
5
Analyze the fifth clinical presentation (post-MI holosystolic).
Identified as Acute Mitral Regurgitation.
A new holosystolic murmur with acute heart failure post-MI suggests a mechanical complication such as papillary muscle rupture.

Key Concept

Valvular Heart Disease Pathophysiology and Auscultation
Question 282Question →

Match the following characteristic arterial pulse abnormalities identified on physical examination with their most likely underlying cardiovascular pathology.

Click a left item, then click its matching right item

Items

Pulsus parvus et tardus (weak and delayed pulse)
Water-hammer (Corrigan) pulse (bounding pulse with rapid runoff)
Pulsus paradoxus (exaggerated drop in systolic blood pressure during inspiration)
Pulsus alternans (alternating strong and weak pulse beats)

Matches

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Answer

Pulsus parvus et tardus matches with Severe aortic stenosis. Water-hammer pulse matches with Severe aortic regurgitation. Pulsus paradoxus matches with Cardiac tamponade. Pulsus alternans matches with Severe left ventricular systolic dysfunction.
Each pulse abnormality has a distinct pathophysiologic mechanism linked to a specific functional or structural cardiac defect. Aortic stenosis restricts outflow (parvus et tardus), aortic regurgitation causes rapid stroke volume ejection and diastolic runoff (water-hammer), tamponade restricts left-sided filling during inspiration (paradoxus), and severe heart failure causes alternating stroke volumes (alternans).

Step-by-Step Solution

1
Analyze pulsus parvus et tardus.
It describes a weak ('parvus') and delayed ('tardus') pulse.
Recognizing this pulse characteristically points to fixed left ventricular outflow tract obstruction, pathognomonic for severe aortic stenosis.
2
Analyze the water-hammer (Corrigan) pulse.
It describes a bounding pulse with rapid upstroke and collapse.
This wide pulse pressure presentation results from rapid diastolic runoff, classically seen in severe aortic regurgitation.
3
Analyze pulsus paradoxus.
It represents a >10 mmHg drop in systolic blood pressure during inspiration.
This finding is classically associated with cardiac tamponade due to enhanced ventricular interdependence within a fluid-filled pericardial sac.
4
Analyze pulsus alternans.
It represents alternating strong and weak beats independent of the respiratory cycle.
This finding indicates severe left ventricular systolic dysfunction due to beat-to-beat variations in stroke volume.

Key Concept

Classic arterial pulse abnormalities and their associated cardiovascular pathologies.
Estimated Time:1m 0s
Question 283Question →

A 2929-year-old primigravida at 3030 weeks gestation is brought to the emergency department due to rapidly progressive shortness of breath, palpitations, and hemoptysis that began 2424 hours ago. She reports a sense of overwhelming anxiety and impending doom. She has a history of bipolar I disorder, currently well-controlled on lamotrigine, and mild intermittent asthma since childhood. Her temperature is 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), blood pressure is 112/68112/68 mmHg, pulse is 135135 /min and irregularly irregular, and respiratory rate is 2828 /min. Oxygen saturation is 88%88\% on room air and improves to 94%94\% on supplemental oxygen.

Physical examination reveals prominent jugular venous pulsations with absent 'a' waves. Pulmonary auscultation reveals bilateral crackles up to the mid-scapulae with scattered expiratory wheezes. Cardiac auscultation reveals a loud first heart sound, a high-frequency sound in early diastole, and a low-pitched mid-diastolic sound best heard at the apex in the left lateral decubitus position.

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

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Answer: Administer intravenous metoprolol and furosemide

Answer

The correct next step is to administer intravenous metoprolol and furosemide to manage the acute pulmonary edema and rapid ventricular response caused by decompensated mitral stenosis.
The correct management is the administration of intravenous metoprolol and furosemide. This patient's clinical presentation—rapidly progressive dyspnea, hemoptysis, and physical exam findings of a loud first heart sound, opening snap, and mid-diastolic rumble—is highly consistent with rheumatic mitral stenosis. The irregularly irregular rhythm and absent 'a' waves in the jugular venous pulse indicate new-onset atrial fibrillation. In patients with mitral stenosis, the fixed valve area means that left ventricular filling is highly dependent on the duration of diastole. The tachycardia associated with atrial fibrillation drastically shortens diastolic filling time, leading to a severe and rapid rise in left atrial pressure. In a pregnant patient, who already has a physiologic 40%40\% to 50%50\% increase in plasma volume, this acute rise in pressure immediately transmits to the pulmonary vasculature, causing flash pulmonary edema (manifesting as crackles, wheezing, and hypoxemia). Immediate management requires strict rate control to prolong diastole (using beta-blockers like metoprolol or non-dihydropyridine calcium channel blockers) and diuresis to reduce pulmonary congestion (using loop diuretics like furosemide).

Step-by-Step Solution

1
Identify the underlying valvular pathology from the physical examination.
The loud first heart sound, early diastolic high-frequency sound (opening snap), and low-pitched mid-diastolic murmur strongly indicate rheumatic mitral stenosis.
Recognizing the classic auscultatory findings of mitral stenosis is crucial for understanding the patient's hemodynamic compromise.
2
Determine the cause of the acute decompensation.
The irregularly irregular pulse with absent 'a' waves in the jugular venous pulse signifies new-onset atrial fibrillation.
Tachycardia in mitral stenosis drastically reduces diastolic filling time, causing blood to back up into the pulmonary circulation. This is exacerbated by the physiologic 40%40\% to 50%50\% plasma volume expansion of pregnancy.
3
Select the most appropriate pharmacologic intervention.
Intravenous beta-blockers (like metoprolol) are needed for rate control, and loop diuretics (like furosemide) are required to treat the pulmonary edema.
Slowing the heart rate increases diastolic filling time, directly reducing left atrial pressure, while diuresis effectively relieves the fluid overload.

Key Concept

Management of decompensated mitral stenosis with atrial fibrillation in pregnancy relies on strict rate control to prolong diastolic filling time and diuresis to relieve pulmonary congestion.
Question 284Question →

A 72-year-old retired teacher presents to the urgent care clinic with progressively worsening breathing difficulty over the past three days. He reports a sensation of chest tightness and a new cough that produces clear, frothy sputum. His medical history includes hypertension, coronary artery disease, and a 35-pack-year smoking history, though he quit five years ago. Over the last two nights, he has frequently awakened gasping for air and has resorted to sleeping upright in a recliner chair. His current home medications are aspirin, metoprolol, and lisinopril. Vital signs are temperature 36.8°C (98.2°F), blood pressure 168/94 mm Hg, pulse 110/min, and respiratory rate 24/min. Pulse oximetry is 88% on room air. Physical examination reveals prominent jugular venous distention. Lung auscultation demonstrates widespread expiratory wheezing and fine crackles extending to the mid-lung fields bilaterally. Cardiac examination reveals tachycardia with a regular rhythm and an extra low-frequency heart sound occurring just after S2. There is 2+ bilateral pitting edema extending to the mid-calf. Which of the following is the most appropriate initial pharmacologic management for this patient?

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Answer: Intravenous furosemide

Answer

Intravenous furosemide is the most appropriate initial pharmacologic therapy.
This patient's presentation of worsening dyspnea, orthopnea, paroxysmal nocturnal dyspnea, frothy sputum, jugular venous distention, an S3 gallop, and peripheral edema is highly characteristic of acute decompensated heart failure (ADHF). The wheezing is due to peribronchial edema (often termed 'cardiac asthma') rather than primary bronchospasm. The most appropriate initial pharmacologic management for ADHF with signs of volume overload is intravenous loop diuretics (e.g., furosemide), which rapidly decrease preload and alleviate pulmonary congestion.

Step-by-Step Solution

1
Analyze the patient's symptoms and vital signs.
The patient presents with acute dyspnea, orthopnea, paroxysmal nocturnal dyspnea, hypoxemia (88%), and hypertension.
Identifying the onset and nature of respiratory distress helps narrow the differential diagnosis.
2
Interpret the physical examination findings.
Findings include jugular venous distention, an S3 gallop, crackles, wheezing, and peripheral edema.
Differentiating between pulmonary (e.g., COPD) and cardiac (e.g., ADHF) causes of dyspnea relies heavily on clinical signs. An S3 gallop and JVD are highly specific for heart failure.
3
Synthesize the data to form a definitive diagnosis.
The combination of symptoms and signs confirms acute decompensated heart failure (ADHF) presenting with 'cardiac asthma' (wheezing due to peribronchial edema).
Recognizing that wheezing can occur in ADHF prevents the misdiagnosis of a COPD exacerbation in a patient with a smoking history.
4
Determine the most appropriate initial pharmacologic management.
Intravenous furosemide should be administered.
Loop diuretics rapidly reduce intravascular volume and preload, which is the primary immediate goal in managing ADHF with pulmonary edema.

Key Concept

Acute decompensated heart failure (ADHF) can present with wheezing ('cardiac asthma') due to peribronchial edema, which must be distinguished from a COPD exacerbation using specific signs like an S3 gallop and jugular venous distention. Intravenous loop diuretics are the primary treatment.
Estimated Time:1m 30s
Question 285Question →

A 65-year-old man presents to the emergency department with sudden-onset, severe, tearing chest pain that radiates to his back. His blood pressure is 190/110 mmHg in the right arm and 140/80 mmHg in the left arm. His heart rate is 112/min. A bedside chest radiograph shows a widened mediastinum. Suspecting an acute aortic dissection, arrange the following management steps in the most appropriate chronological order.

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Answer

The correct chronological sequence is to first administer an intravenous beta-blocker, followed by an intravenous vasodilator, then perform CT angiography to confirm the diagnosis, and finally consult cardiothoracic surgery for emergent repair.
The established protocol for suspected acute aortic dissection prioritizes strict heart rate and blood pressure control to halt the progression of the intimal tear. A beta-blocker must be given first to reduce heart rate and contractility (dP/dt). Once the heart rate is controlled (target <60/min), a vasodilator can be added to safely lower systolic blood pressure (target 100-120 mmHg) without causing reflex tachycardia. Only after the patient is medically stabilized should they be sent for definitive imaging (CT angiography), which is necessary to confirm the diagnosis and anatomical involvement before consulting surgery for a Type A dissection.

Step-by-Step Solution

1
Control heart rate and shear stress
Administer IV beta-blocker
Prevents reflex tachycardia and limits the progression of the dissection flap by reducing left ventricular dP/dt.
2
Control blood pressure
Administer IV vasodilator
Safely lowers systolic blood pressure (target 100-120 mmHg) only after beta-blockade has been established.
3
Confirm the diagnosis
Perform CT angiography
Differentiates Stanford Type A from Type B dissection to guide definitive surgical or medical management.
4
Provide definitive treatment
Consult cardiothoracic surgery
Stanford Type A dissections involve the ascending aorta and require immediate surgical repair to prevent fatal complications.

Key Concept

In the acute management of aortic dissection, intravenous beta-blockers must be administered before vasodilators to prevent reflex tachycardia and increased ventricular contractility (dP/dt), which would worsen aortic shear stress. This medical stabilization must precede confirmatory imaging and subsequent surgical repair.
Question 286Question →

A 65-year-old man is admitted to the cardiac intensive care unit following a myocardial infarction. While he is resting in bed, the telemetry monitor suddenly alarms, showing a wide-complex tachycardia at a rate of 180/min. The nurse rushes into the room and finds the patient completely unresponsive. Arrange the following critical next steps in the correct chronological sequence according to standard Advanced Cardiovascular Life Support (ACLS) protocols.

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Answer

The correct sequence is to first verify the absence of a pulse, immediately initiate CPR, deliver a defibrillation shock, and then administer epinephrine.
In an unresponsive patient with a concerning rhythm on telemetry, the first step is to rapidly assess for a pulse (checking for 5 to 10 seconds). Once pulseless ventricular tachycardia is confirmed, high-quality CPR must be initiated immediately while the defibrillator is charging. Defibrillation (unsynchronized shock) is the primary treatment for pulseless ventricular tachycardia and should be delivered as soon as possible. Epinephrine is administered later in the algorithm to maintain coronary and cerebral perfusion pressures, typically after the first or second shock fails to achieve the return of spontaneous circulation.

Step-by-Step Solution

1
Evaluate for a central pulse.
Confirm that the wide-complex tachycardia is associated with pulselessness (pulseless ventricular tachycardia).
Unresponsive patients with wide-complex tachycardia on the monitor may have a pulse (requiring synchronized cardioversion) or no pulse (requiring the cardiac arrest algorithm).
2
Begin cardiopulmonary resuscitation (CPR).
Chest compressions are initiated.
High-quality CPR maintains vital organ perfusion and should be started immediately after confirming cardiac arrest while the defibrillator is being prepared.
3
Defibrillate the patient.
An unsynchronized shock is delivered.
Pulseless ventricular tachycardia is a shockable rhythm, and early defibrillation is the most important determinant of survival.
4
Give pharmacological therapy.
Epinephrine is administered.
Vasopressors are introduced into the algorithm if the patient remains in cardiac arrest after initial CPR and defibrillation attempts.

Key Concept

The ACLS cardiac arrest algorithm for shockable rhythms (pulseless ventricular tachycardia and ventricular fibrillation) prioritizes a rapid pulse check, immediate CPR, early defibrillation, and subsequent pharmacotherapy with epinephrine.
Question 287Question →

A 65-year-old man is brought to the emergency department by ambulance due to the sudden onset of severe, "tearing" chest pain radiating to his interscapular region that began 11 hour ago. He also reports progressive, severe shortness of breath over the past 3030 minutes. His medical history is significant for hypertension, hyperlipidemia, and a 4040-pack-year smoking history.

Vital signs are:
Blood pressure: 84/4084/40 mmHg in the right arm and 62/3562/35 mmHg in the left arm
Heart rate: 128128/min
Respiratory rate: 2828/min
SpO2: 85%85\% on room air

Physical examination reveals a diaphoretic, agitated patient in severe respiratory distress. Jugular venous distension is present at 1212 cm H2OH_2O. Cardiac auscultation reveals tachycardia and a high-pitched, blowing, early diastolic murmur best heard at the right second intercostal space. Lung auscultation reveals diffuse bilateral crackles and prominent expiratory wheezes. The right radial pulse is bounding, while the left radial pulse is absent.

ECG shows sinus tachycardia and left ventricular hypertrophy with a strain pattern, but no ST-segment elevations.

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

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Answer: Bedside transesophageal echocardiography

Answer

Bedside transesophageal echocardiography
This patient's presentation of abrupt-onset tearing chest pain, asymmetric blood pressures, and unequal pulses is highly suspicious for an acute aortic dissection. The new-onset high-pitched, early diastolic murmur at the right sternal border indicates that the dissection has extended proximally to involve the aortic root, resulting in acute severe aortic regurgitation. This structural failure has precipitated acute cardiogenic shock and flash pulmonary edema (manifesting as crackles and "cardiac asthma" wheezing). In the evaluation of suspected aortic dissection, the patient's hemodynamic stability dictates the imaging pathway. For hemodynamically stable patients, computed tomography (CT) angiography is the gold standard. However, for hemodynamically unstable patients (e.g., profound hypotension), transporting the patient out of the emergency department to the CT scanner is strictly contraindicated. Bedside transesophageal echocardiography (TEE) is highly sensitive and specific for thoracic aortic dissection, can directly visualize the aortic valve, and is performed immediately at the bedside, making it the most appropriate next step.

Step-by-Step Solution

1
Analyze the clinical presentation to identify the primary pathology.
The patient has abrupt-onset tearing chest pain radiating to the back, asymmetric blood pressures, and unequal pulses. This classic triad strongly suggests an acute aortic dissection.
Recognizing the hallmark signs of an aortic catastrophe is critical for timely intervention.
2
Evaluate the patient's hemodynamic status and complications.
The patient is in cardiogenic shock (hypotension, tachycardia) and has acute pulmonary edema (crackles, wheezing, hypoxia). The new early diastolic murmur indicates the dissection has extended proximally into the aortic root, causing acute severe aortic regurgitation.
Identifying complications (shock, acute valvular regurgitation) alters both the diagnostic and therapeutic algorithm.
3
Determine the most appropriate next step for an unstable patient.
Because the patient is hemodynamically unstable, transporting him out of the resuscitation bay for a CT scan is unsafe. Bedside transesophageal echocardiography (TEE) is the test of choice to rapidly confirm the dissection flap and evaluate the aortic valve.
Diagnostic algorithms dictate that unstable patients with suspected vascular emergencies must be evaluated at the bedside.

Key Concept

In hemodynamically unstable patients with suspected acute aortic dissection, bedside transesophageal echocardiography (TEE) is the diagnostic imaging modality of choice.
Estimated Time:1m 30s
Question 288Question →

A 6464-year-old man is brought to the emergency department via ambulance due to the sudden onset of severe, "tearing" anterior chest pain that radiates to his back. He has a history of long-standing, poorly controlled hypertension. On arrival, he appears diaphoretic and in severe distress. Blood pressure is 210/110210/110 mmHg in the right arm and 170/90170/90 mmHg in the left arm. Heart rate is 112112/min. Physical examination reveals an early diastolic decrescendo murmur auscultated at the right upper sternal border. Neurological examination is unremarkable. Electrocardiogram shows left ventricular hypertrophy without acute ischemic changes. Arrange the following management steps in the most appropriate sequential order for this patient.

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Answer

The correct sequential order for managing suspected acute Type A aortic dissection is to first administer intravenous beta-blockers (esmolol), followed by intravenous vasodilators (sodium nitroprusside), then obtain definitive imaging (computed tomography angiography), and finally proceed to emergent surgical repair.
The correct sequence prioritizes immediate anti-impulse therapy to halt dissection propagation, strictly adhering to the physiological rule that heart rate (dP/dt) must be controlled before blood pressure, followed subsequently by definitive diagnostic imaging and definitive surgical management.

Step-by-Step Solution

1
Initiate intravenous esmolol therapy
Decreases heart rate to a target of <60<60/min and reduces left ventricular contractility.
Must be given first to decrease the rate of rise of aortic pressure (dP/dt), minimizing aortic wall shear stress and preventing further dissection propagation.
2
Initiate intravenous sodium nitroprusside therapy
Lowers systolic blood pressure to a target of 100−120100-120 mmHg.
Must be given only AFTER beta-blockade is established; if given first, vasodilators cause reflex tachycardia and increased contractility, which worsens shear stress and propagates the intimal tear.
3
Obtain computed tomography angiography of the aorta
Confirms the diagnosis and delineates the extent of the dissection.
Once the patient is hemodynamically stabilized with anti-impulse medical therapy, definitive non-invasive imaging is required to confirm the presence of an intimal flap and identify ascending aorta involvement (Stanford Type A).
4
Proceed to emergent cardiothoracic surgical repair
Provides definitive anatomical treatment of the Type A dissection.
Type A dissections (suggested clinically here by the new aortic regurgitation murmur) have a very high short-term mortality rate due to complications like cardiac tamponade, aortic rupture, or coronary artery occlusion, requiring emergent open surgery.

Key Concept

In the management of highly suspected acute aortic dissection, intravenous beta-blockers must be administered before intravenous vasodilators to prevent reflex tachycardia and increased aortic wall shear stress. Immediate hemodynamic stabilization strictly precedes definitive imaging and surgical repair.

Alternative Method

In cases where beta-blockers are strictly contraindicated (e.g., severe reactive airway disease, high-degree AV block), intravenous non-dihydropyridine calcium channel blockers like diltiazem or verapamil can be used for initial heart rate control prior to vasodilator therapy.
Estimated Time:2m 0s
Question 289Question →

Paramedics arrive at the emergency department with a 58-year-old male executive who experienced an abrupt onset of excruciating, sharp pain between his shoulder blades while in a board meeting. His medical history is significant for tobacco use and noncompliance with antihypertensive medications. Vital signs reveal a blood pressure of 215/118 mm Hg215/118\text{ mm Hg}, a heart rate of 118/min118\text{/min}, and a respiratory rate of 22/min22\text{/min}. Cardiac auscultation reveals a regular rhythm with a new early diastolic murmur at the right sternal border. An immediate bedside electrocardiogram shows left ventricular hypertrophy without acute ischemic changes. Given the high clinical suspicion for an acute vascular emergency, arrange the following management steps in the most appropriate chronological sequence from first to last.

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Answer

The correct chronological sequence is: 1) Administer an intravenous beta-blocker, 2) Administer an intravenous vasodilator, 3) Perform cross-sectional imaging, 4) Determine the need for emergent operative repair versus medical therapy.
In the initial management of a highly suspected acute aortic dissection, the primary goal is to immediately reduce aortic wall shear stress (anti-impulse therapy). This is achieved by first administering an intravenous beta-blocker (e.g., esmolol, labetalol) to decrease heart rate and left ventricular contractility (dP/dt). Only after the heart rate is controlled should an intravenous vasodilator (e.g., sodium nitroprusside) be added to further lower systolic blood pressure. Once pharmacological stabilization is initiated, definitive cross-sectional imaging (CT angiography or TEE) is performed to classify the dissection (Stanford Type A vs. B), which ultimately dictates whether the patient requires emergent surgery or continued medical management.

Step-by-Step Solution

1
Recognize the clinical presentation of an acute aortic dissection.
The patient's abrupt, tearing back pain, severe hypertension, and new aortic regurgitation murmur strongly suggest an acute aortic dissection.
Immediate recognition is required to initiate life-saving anti-impulse therapy before definitive imaging is obtained.
2
Initiate anti-impulse therapy with an intravenous beta-blocker.
Heart rate is lowered to < 60/min and left ventricular contractility (dP/dt) is reduced.
Beta-blockade minimizes the shear stress on the aortic wall, preventing rapid propagation of the intimal tear.
3
Add an intravenous vasodilator.
Systolic blood pressure is further reduced to a target of 100-120 mm Hg.
Vasodilators are necessary for blood pressure control but must only be given after beta-blockade to prevent dangerous reflex tachycardia.
4
Obtain definitive diagnostic imaging and plan definitive treatment.
CT angiography classifies the dissection as Stanford Type A or B, dictating surgical or medical management.
Anatomical classification is required to determine if the patient needs to go to the operating room immediately.

Key Concept

Management of Acute Aortic Dissection: Anti-impulse Therapy Sequencing
Question 290Question →

A 68-year-old man is brought to the emergency department due to a syncopal episode at home. Over the past 3 days, he has experienced progressively worsening shortness of breath and a dry cough. His medical history is significant for severe chronic obstructive pulmonary disease (COPD), type 2 diabetes mellitus, and a recent diagnosis of prostate cancer. His current medications include inhaled tiotropium, inhaled albuterol as needed, and metformin.

On arrival, his temperature is 37.1∘C37.1^\circ\text{C} (98.8∘F98.8^\circ\text{F}), blood pressure is 82/50 mm Hg82/50\text{ mm Hg}, pulse is 122/min122/\text{min}, and respirations are 28/min28/\text{min}. Pulse oximetry shows 84%84\% on room air.

Physical examination reveals significant jugular venous distention to the angle of the jaw. Cardiac auscultation demonstrates a loud second heart sound (P2P_2) at the left upper sternal border and a holosystolic murmur at the left lower sternal border that increases in intensity with inspiration. Lung auscultation reveals faint, bilateral end-expiratory wheezes without crackles. The right calf is visibly swollen and tender to palpation.

A bedside echocardiogram demonstrates a severely dilated, hypokinetic right ventricle with bowing of the interventricular septum into the left ventricle.

Arterial blood gas analysis on room air reveals:
pH: 7.297.29
PaCO2\text{PaCO}_2: 32 mm Hg32\text{ mm Hg}
PaO2\text{PaO}_2: 52 mm Hg52\text{ mm Hg}
HCO3−\text{HCO}_3^-: 15 mEq/L15\text{ mEq/L}

Serum lactic acid is 5.4 mmol/L5.4\text{ mmol/L}.

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

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Answer: Intravenous alteplase

Answer

The most appropriate next step in management is the administration of intravenous alteplase.
This patient's presentation of syncope, hypotension, right ventricular strain (JVD, loud P2P_2, tricuspid regurgitation murmur), right calf swelling, and a history of malignancy points strongly to a massive pulmonary embolism (PE). A massive PE is defined by the presence of hemodynamic instability (systolic blood pressure <90 mm Hg<90\text{ mm Hg}). The large clot burden drastically increases pulmonary vascular resistance, causing acute right ventricular (RV) dilation, hypokinesis, and bowing of the interventricular septum into the left ventricle (LV). This septal bowing impairs LV filling (preload), leading to drastically reduced cardiac output, obstructive shock, and subsequent lactic acidosis. In patients with massive PE and no absolute contraindications, immediate systemic thrombolysis (e.g., intravenous alteplase) is the treatment of choice to rapidly restore pulmonary perfusion and stabilize hemodynamics.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and vital signs.
The patient has obstructive shock characterized by hypotension (82/50 mm Hg82/50\text{ mm Hg}), tachycardia, and hypoxia, accompanied by right heart strain signs (JVD, loud P2P_2, tricuspid regurgitation murmur) and a likely DVT (swollen right calf).
Identifying the shock phenotype is the crucial first step to directing lifesaving therapy.
2
Interpret the bedside echocardiogram findings.
The echocardiogram shows severe right ventricular dilation and hypokinesis with septal bowing, confirming acute cor pulmonale/RV failure.
This confirms that the hemodynamic collapse is due to acute pulmonary hypertension secondary to a massive pulmonary embolism.
3
Evaluate the arterial blood gas values and serum lactate.
The patient has a primary metabolic acidosis (lactic acidosis from hypoperfusion). Winter's formula (Expected PaCO2=1.5×15+8=30.5±2 mm Hg\text{PaCO}_2 = 1.5 \times 15 + 8 = 30.5 \pm 2\text{ mm Hg}) confirms the measured PaCO2\text{PaCO}_2 of 32 mm Hg32\text{ mm Hg} is appropriate respiratory compensation.
Ruling out a primary uncompensated respiratory acidosis prevents the critical error of initiating mechanical ventilation, which could be fatal.
4
Determine the optimal intervention for massive PE.
The definitive treatment for massive (hemodynamically unstable) pulmonary embolism is systemic thrombolysis with an agent like alteplase.
Thrombolytics rapidly dissolve the massive clot burden, decreasing pulmonary vascular resistance, improving RV forward flow, and reversing the obstructive shock.

Key Concept

Massive pulmonary embolism presents with obstructive shock, right ventricular failure, and profound hypoxemia; it requires immediate systemic thrombolysis.
Estimated Time:2m 0s
Question 291Question →

A 67-year-old retired factory worker is evaluated in the outpatient clinic due to progressive bilateral lower extremity swelling, abdominal fullness, and exertional breathlessness over the past 3 months. He has a 45-pack-year smoking history and a five-year history of severe chronic obstructive pulmonary disease (COPD). His current daily medications include an inhaled corticosteroid, a long-acting muscarinic antagonist, and a long-acting beta-agonist. Today, his blood pressure is 128/78 mmHg, pulse is 88/min, and oxygen saturation is 87% on room air. Physical examination reveals a barrel-shaped chest. Jugular venous distension is prominent at 11 cm H2O. Lung fields are hyperresonant to percussion with globally diminished breath sounds but no crackles. Cardiac auscultation reveals a palpable right ventricular heave and a distinctly loud pulmonic component of the second heart sound (P2), with no apical murmurs or left-sided gallops. Abdominal palpation demonstrates hepatomegaly and a positive hepatojugular reflux. A recent transthoracic echocardiogram confirms severe right ventricular dilation and right ventricular hypertrophy, alongside a normal left ventricular ejection fraction of 62%. Which of the following interventions is most likely to prolong this patient's survival?

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Answer: Continuous long-term supplemental oxygen therapy

Answer

Continuous long-term supplemental oxygen therapy
The correct answer is continuous long-term supplemental oxygen therapy. This patient presents with classic signs of cor pulmonale (right-sided heart failure secondary to chronic pulmonary disease). His severe COPD has caused chronic hypoxia, leading to continuous hypoxic pulmonary vasoconstriction, secondary pulmonary hypertension, and eventual right ventricular hypertrophy and dilation. In patients with COPD who have severe resting hypoxemia (defined as an oxygen saturation <= 88% or PaO2 <= 55 mmHg), long-term supplemental oxygen therapy (used for at least 15 hours per day) is one of the only interventions that has been definitively proven to prolong survival. It works by alleviating the hypoxic pulmonary vasoconstriction, thereby reducing right ventricular afterload and delaying the progression of cor pulmonale.

Step-by-Step Solution

1
Analyze the patient's presentation and physical exam findings.
The patient has signs of isolated right-sided heart failure (jugular venous distension, right ventricular heave, loud P2, hepatomegaly) with clear lungs and normal left ventricular function on echocardiography.
This establishes the diagnosis of cor pulmonale, secondary to his known severe COPD.
2
Identify the primary pathophysiological driver of the disease process.
Chronic hypoxemia from COPD causes continuous hypoxic pulmonary vasoconstriction, leading to pulmonary hypertension and subsequent right ventricular failure.
Understanding the mechanism is necessary to select a targeted, mortality-reducing intervention rather than just treating symptoms.
3
Select the intervention that addresses the root cause and improves long-term survival.
Long-term supplemental oxygen therapy reverses hypoxic pulmonary vasoconstriction.
Oxygen therapy is one of the few interventions definitively proven to decrease mortality in patients with severe resting hypoxemia (SaO2 <= 88%) due to COPD.

Key Concept

Cor pulmonale is right ventricular failure secondary to pulmonary disease. In COPD-induced cor pulmonale, continuous long-term supplemental oxygen therapy is the primary intervention proven to prolong survival by reducing hypoxic pulmonary vasoconstriction.
Question 292Question →

Match each clinical presentation with the most likely underlying cardiovascular diagnosis.

Click a left item, then click its matching right item

Items

A patient presents with sharp, pleuritic chest pain that improves upon leaning forward, accompanied by widespread ST-segment elevation on electrocardiogram.
A patient with uncontrolled hypertension develops sudden, tearing back pain; examination reveals asymmetric blood pressures in the upper extremities.
A patient evaluated two weeks after an acute anterior myocardial infarction suddenly develops profound hypotension, jugular venous distension, and distant heart sounds.
A patient complains of worsening shortness of breath when lying flat, waking up gasping for air, and physical examination demonstrates a third heart sound (S3).

Matches

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Answer

The correct matches align classic clinical vignettes with their respective cardiovascular pathologies: Pericarditis for pleuritic pain and diffuse ST elevation; Aortic Dissection for tearing pain and asymmetric pulses; Free Wall Rupture for post-MI tamponade; and Left-Sided Heart Failure for orthopnea and an S3 gallop.
Each clinical scenario is uniquely characterized by distinct pathophysiological mechanisms. Acute pericarditis presents with position-dependent pain and diffuse ST-segment elevation. Acute aortic dissection causes tearing pain and pulse deficits due to arterial branch occlusion. Ventricular free wall rupture leads to rapid cardiac tamponade, manifesting as Beck's triad (hypotension, jugular venous distension, muffled heart sounds). Left-sided heart failure causes pulmonary congestion leading to orthopnea and an S3 gallop.

Step-by-Step Solution

1
Analyze the first presentation regarding pleuritic pain and diffuse ST elevation.
Matches acute pericarditis.
These are the hallmark historical and electrocardiographic signs of pericardial inflammation.
2
Analyze the second presentation regarding tearing back pain and asymmetric blood pressures.
Matches acute Type A aortic dissection.
Intimal tearing of the aorta disrupts blood flow to branch vessels, causing asymmetric pulses and tearing pain.
3
Analyze the third presentation regarding post-MI hypotension, jugular venous distension, and distant heart sounds.
Matches ventricular free wall rupture.
This is a catastrophic mechanical complication of a myocardial infarction leading to hemopericardium and cardiac tamponade, manifesting as Beck's triad.
4
Analyze the fourth presentation regarding orthopnea, paroxysmal nocturnal dyspnea, and an S3 gallop.
Matches left-sided heart failure.
These findings indicate elevated left ventricular filling pressures and pulmonary venous congestion.

Key Concept

Recognition of classic clinical and hemodynamic presentations of major cardiovascular diseases.
Question 293Question →

Match each classic cardiac auscultation finding to its most likely underlying valvular pathology.

Click a left item, then click its matching right item

Items

Harsh systolic crescendo-decrescendo murmur at the right upper sternal border radiating to the carotids
Holosystolic, blowing murmur at the apex radiating to the axilla
Early diastolic decrescendo murmur at the left sternal border best heard with the patient leaning forward
Mid-diastolic rumbling murmur with a preceding opening snap at the apex

Matches

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Answer

The harsh systolic crescendo-decrescendo murmur matches Aortic stenosis; the holosystolic apical murmur matches Mitral regurgitation; the early diastolic decrescendo murmur matches Aortic regurgitation; and the mid-diastolic rumble with an opening snap matches Mitral stenosis.
Each valvular pathology has distinct auscultatory characteristics based on the affected valve's anatomical location and the timing of abnormal blood flow. Aortic stenosis presents as a systolic murmur radiating to the carotids. Mitral regurgitation creates a holosystolic apical murmur. Aortic regurgitation is characterized by an early diastolic decrescendo murmur, and mitral stenosis presents with a diastolic rumble and an opening snap.

Step-by-Step Solution

1
Analyze the first auscultation finding: a harsh systolic crescendo-decrescendo murmur at the right upper sternal border with radiation to the carotids.
This is paired with Aortic stenosis.
The location (aortic area) and radiation (carotids) point to the aortic valve, and the systolic timing indicates stenosis during ventricular ejection.
2
Analyze the second finding: a holosystolic, blowing murmur at the apex radiating to the axilla.
This is paired with Mitral regurgitation.
The holosystolic nature indicates abnormal backward flow throughout systole. The apex is the best auscultation site for the mitral valve, and radiation to the axilla is classic.
3
Analyze the third finding: an early diastolic decrescendo murmur at the left sternal border, enhanced by leaning forward.
This is paired with Aortic regurgitation.
This murmur happens in diastole when blood leaks back from the aorta into the left ventricle. Leaning forward brings the aortic root closer to the chest wall.
4
Analyze the fourth finding: a mid-diastolic rumbling murmur with a preceding opening snap at the apex.
This is paired with Mitral stenosis.
The opening snap occurs when the stiff mitral valve abruptly opens, followed by a rumbling murmur as blood flows through the narrowed valve during diastole.

Key Concept

Identifying valvular heart diseases based on characteristic murmurs
Question 294Question →

Match the following cardiovascular pathologies with their most characteristic right and left heart catheterization hemodynamic findings.

Click a left item, then click its matching right item

Items

Cardiac tamponade
Constrictive pericarditis
Restrictive cardiomyopathy
Acute severe mitral regurgitation
Massive pulmonary embolism

Matches

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Answer

Cardiac tamponade matches with equalization of diastolic pressures and a blunted y-descent. Constrictive pericarditis matches with equalization of pressures, prominent y-descent, and dip/plateau sign. Restrictive cardiomyopathy matches with LVEDP > RVEDP by > 5 mm Hg. Acute severe mitral regurgitation matches with prominent v-waves in the PCWP tracing. Massive pulmonary embolism matches with elevated right-sided pressures and normal/low PCWP.
Hemodynamic monitoring via right and left heart catheterization provides distinct waveforms and pressure readings that are highly diagnostic for specific cardiovascular pathologies. Understanding the physiological basis for these pressure changes allows for accurate matching of each condition to its exact hemodynamic profile.

Step-by-Step Solution

1
Analyze the hemodynamic profile of cardiac tamponade.
Fluid in the pericardial space compresses all chambers uniformly, equalizing diastolic pressures and blunting the y-descent due to restricted early filling.
To identify the matching right item for cardiac tamponade.
2
Analyze the hemodynamic profile of constrictive pericarditis.
A rigid pericardium allows rapid early filling (sharp y-descent) but abruptly halts it (dip and plateau), with equalization of diastolic pressures.
To identify the matching right item for constrictive pericarditis.
3
Analyze the hemodynamic profile of restrictive cardiomyopathy.
Stiff myocardium restricts filling. LVEDP is typically greater than RVEDP by >5 mm Hg because the left ventricle is thicker and less compliant than the right.
To differentiate restrictive cardiomyopathy from constrictive pericarditis.
4
Analyze the hemodynamic profile of acute severe mitral regurgitation.
Backward flow into a normal-sized, non-compliant left atrium during systole creates a giant, rapid v-wave on the PCWP tracing.
To identify the matching right item for acute severe mitral regurgitation.
5
Analyze the hemodynamic profile of massive pulmonary embolism.
Obstruction of the pulmonary vasculature leads to right heart strain (high right-sided pressures) and underfilling of the left heart (normal/low PCWP).
To identify the matching right item for massive pulmonary embolism.

Key Concept

Hemodynamic differentiation of structural, myocardial, and pericardial cardiac disease.
Estimated Time:2m 0s
Question 295Question →

A 71-year-old woman is evaluated in the intensive care unit for persistent respiratory distress and hypotension. She was intubated earlier today for severe hypoxemic respiratory failure. Her past medical history includes severe chronic obstructive pulmonary disease (FEV1\text{FEV}_1 35%35\% of predicted) and a prior anterior myocardial infarction. Current vital signs show a temperature of 37.1∘C37.1^\circ\text{C} (98.8∘F98.8^\circ\text{F}), heart rate of 115 /min115\text{ /min}, blood pressure of 86/54 mmHg86/54\text{ mmHg}, and oxygen saturation of 94%94\% on mechanical ventilation. Physical examination reveals diffuse bilateral wheezing. A pulmonary artery catheter reveals the following hemodynamic measurements:

* Right atrial pressure: 15 mmHg15\text{ mmHg}
* Pulmonary artery pressure: 58/32 mmHg58/32\text{ mmHg}
* Pulmonary capillary wedge pressure: 28 mmHg28\text{ mmHg}
* Cardiac index: 1.7 L/min/m21.7\text{ L/min/m}^2

Based on these findings, which of the following is the most appropriate next step in pharmacological management?

Show answer & explanation

Answer: Intravenous dobutamine

Answer

Intravenous dobutamine
The correct answer identifies that the patient is in cardiogenic shock, characterized by hypotension, a severely reduced cardiac index, and an elevated pulmonary capillary wedge pressure (PCWP). The elevated PCWP (>18 mm Hg) confirms that the primary pathology is acute decompensated left heart failure, and the wheezing ("cardiac asthma") is secondary to pulmonary edema, not primarily a chronic obstructive pulmonary disease (COPD) exacerbation. The most appropriate next step is initiating an inotrope, such as dobutamine, to improve myocardial contractility, increase cardiac output, and maintain systemic perfusion.

Step-by-Step Solution

1
Analyze patient's clinical presentation.
Hypotension, tachycardia, and respiratory failure with wheezing in a patient with a history of myocardial infarction and COPD.
To form a differential diagnosis for mixed presentation of shock and respiratory failure.
2
Interpret hemodynamic data from the pulmonary artery catheter.
PCWP is extremely elevated (28 mmHg28\text{ mmHg}), confirming left-sided volume overload.
To differentiate between cardiogenic causes (high PCWP) and primary pulmonary/right heart causes (normal or low PCWP).
3
Evaluate cardiac output and systemic perfusion.
Severely reduced cardiac index (1.7 L/min/m21.7\text{ L/min/m}^2) combined with hypotension confirms cardiogenic shock.
To determine the severity of pump failure and the physiological need for inotropic support.
4
Determine the most appropriate pharmacological management.
Intravenous dobutamine is indicated.
Inotropes improve forward flow, increase cardiac output, and reduce pulmonary congestion in cardiogenic shock.

Key Concept

Differentiation of shock etiologies using pulmonary artery catheter hemodynamics and management of cardiogenic shock.
Estimated Time:2m 0s
Question 296Question →

A 68-year-old man comes to the emergency department with worsening shortness of breath over the past 48 hours. He has a 45-pack-year smoking history, type 2 diabetes mellitus, and long-standing hypertension. The patient reports waking up multiple times during the night feeling like he cannot catch his breath. His temperature is 37.0 C (98.6 F), blood pressure is 168/94 mmHg, pulse is 102/min, and respirations are 24/min. Oxygen saturation is 90% on room air. Examination shows distended neck veins while sitting upright. Chest auscultation reveals diffuse wheezing. Cardiac examination demonstrates a rapid rate, regular rhythm, and an extra low-frequency diastolic sound. There is 2+ pitting edema in both lower extremities. Which of the following laboratory tests is most useful to confirm the primary cause of this patient's symptoms?

Show answer & explanation

Answer: Serum B-type natriuretic peptide

Answer

Serum B-type natriuretic peptide
The correct option identifies a highly sensitive and specific laboratory test for heart failure. The patient's presentation of orthopnea, paroxysmal nocturnal dyspnea, jugular venous distention, an S3 gallop, and pedal edema is classic for acute decompensated heart failure. The diffuse wheezing is secondary to peribronchial edema, known as cardiac asthma. B-type natriuretic peptide is secreted by the ventricular myocardium in response to stretch from volume overload, making it the most useful laboratory test to differentiate heart failure from a primary pulmonary etiology like a COPD exacerbation.

Step-by-Step Solution

1
Identify key clinical findings in the physical examination.
The patient has jugular venous distention, an S3 gallop (extra low-frequency diastolic sound), paroxysmal nocturnal dyspnea, and bilateral lower extremity pitting edema.
Recognizing these classic signs points toward a diagnosis of acute decompensated heart failure.
2
Evaluate confounding symptoms.
The patient has a heavy smoking history and wheezing on exam, which might initially suggest a COPD exacerbation.
Wheezing can occur in heart failure due to peribronchial edema, a condition often referred to as 'cardiac asthma'.
3
Select the most specific laboratory test to differentiate the etiologies.
Serum B-type natriuretic peptide (BNP) is ordered.
BNP is released by the ventricles in response to stretch and volume overload, making it highly specific for confirming heart failure rather than a primary pulmonary cause.

Key Concept

Differentiating acute decompensated heart failure from COPD exacerbation using clinical signs (S3 gallop, JVD) and B-type natriuretic peptide testing.
Question 297Question →

Match each classic cardiovascular physical examination finding with the most likely underlying structural or valvular pathology.

Click a left item, then click its matching right item

Items

A mid-diastolic, low-pitched rumble with an opening snap; the time interval between aortic valve closure (A2A_2) and the opening snap (OSOS) inversely correlates with obstruction severity.
A harsh crescendo-decrescendo systolic murmur at the left lower sternal border that intensifies during the strain phase of the Valsalva maneuver and softens with passive leg raise.
A late-peaking systolic murmur at the right upper sternal border associated with a delayed, low-amplitude carotid upstroke; the murmur softens during sustained handgrip.
A high-pitched, blowing, early diastolic decrescendo murmur best heard along the left sternal border that increases in intensity with sudden squatting.

Matches

Show answer & explanation

Answer

Mitral stenosis matches with rheumatic tethering; HOCM matches with asymmetric septal hypertrophy and SAM; Aortic stenosis matches with calcific degeneration; Aortic regurgitation matches with incomplete semilunar coaptation.
Correct matching requires integrating physical examination findings (murmur timing, quality, and response to physiologic maneuvers) with their underlying anatomical pathology. Valsalva decreases preload, intensifying HOCM; handgrip increases afterload, softening AS; squatting increases afterload, intensifying AR; and a narrowed A2A_2-OSOS interval indicates severe MS.

Step-by-Step Solution

1
Analyze the first clinical finding: mid-diastolic rumble with an opening snap.
Identified as Mitral Stenosis.
The opening snap and diastolic rumble are hallmark signs of mitral stenosis, characterized pathophysiologically by rheumatic thickening of the mitral valve.
2
Analyze the second clinical finding: systolic murmur increasing with Valsalva and decreasing with leg raise.
Identified as Hypertrophic Obstructive Cardiomyopathy (HOCM).
Decreased preload (Valsalva) worsens the dynamic left ventricular outflow tract obstruction in HOCM, which is driven by asymmetric septal hypertrophy and systolic anterior motion of the mitral valve.
3
Analyze the third clinical finding: late-peaking systolic murmur with delayed carotid upstroke, softening with handgrip.
Identified as Aortic Stenosis.
Pulsus parvus et tardus and a late-peaking systolic murmur are classic for severe aortic stenosis, typically caused by age-related calcific degeneration.
4
Analyze the fourth clinical finding: early diastolic decrescendo murmur increasing with sudden squatting.
Identified as Aortic Regurgitation.
Squatting increases systemic vascular resistance (afterload), which worsens the backward flow of blood in aortic regurgitation, caused by incomplete coaptation of the aortic valve leaflets.

Key Concept

Dynamic auscultation and hemodynamic correlations of valvular and structural heart diseases.
Question 298Question →

A 54-year-old man collapses suddenly in the hospital cafeteria. He is unresponsive, apneic, and has no palpable pulse. A bystander has just brought an automated external defibrillator (AED) and the cardiac monitor pads are applied. The monitor displays coarse ventricular fibrillation. Arrange the following interventions in the most appropriate chronological sequence for the initial management of this patient according to standard advanced cardiac life support (ACLS) guidelines.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is to first initiate chest compressions, followed by an unsynchronized shock, then immediate resumption of chest compressions for 2 minutes, and finally the administration of epinephrine if the patient remains in cardiac arrest.
In the management of witnessed cardiac arrest due to ventricular fibrillation, high-quality CPR is the immediate priority. As soon as the defibrillator is ready, an unsynchronized shock should be delivered to terminate the disorganized rhythm. Following the shock, CPR must be resumed immediately for 2 minutes without pausing to check the rhythm, as the stunned myocardium requires time to regain mechanical function. Only after this cycle, while CPR continues, should intravenous access be established and epinephrine administered to improve coronary perfusion pressure.

Step-by-Step Solution

1
Recognize pulseless arrest and start cardiopulmonary resuscitation (CPR).
Maintains minimal vital organ perfusion.
Chest compressions provide temporary mechanical circulation to the brain and heart while definitive treatment is prepared.
2
Defibrillate the patient.
Simultaneous depolarization of a critical mass of myocardium.
This allows the heart's natural pacemaker to potentially resume organized electrical activity.
3
Resume CPR without checking the rhythm.
Restores coronary perfusion pressure.
A perfusing rhythm rarely returns immediately after a shock; pausing to check the rhythm causes a detrimental drop in coronary perfusion.
4
Administer epinephrine 1 mg intravenously.
Causes alpha-adrenergic vasoconstriction.
Increases aortic diastolic pressure, which improves coronary and cerebral blood flow during subsequent chest compressions.

Key Concept

Advanced Cardiac Life Support (ACLS) Pulseless Arrest Algorithm for Shockable Rhythms
Question 299Question →

A 71-year-old woman is evaluated in the hospital during the night shift for acute-onset shortness of breath. She was admitted two days ago for acute pyelonephritis and has been receiving intravenous ceftriaxone alongside aggressive intravenous fluid resuscitation. Currently, she is visibly distressed and prefers to sit upright on the edge of the bed. Her temperature is 37.1°C (98.8°F), blood pressure is 158/92 mm Hg, pulse is 106/min, and respirations are 26/min. Pulse oximetry shows 88% on room air. Physical examination reveals prominent jugular venous distention. Lung auscultation demonstrates bilateral crackles extending to the mid-lung fields, with no wheezing. Cardiac examination reveals a regular rhythm, normal S1 and S2, and a distinct third heart sound (S3). There is 2+ bilateral lower extremity pitting edema. Which of the following is the most appropriate next step in management of this patient's current symptoms?

Show answer & explanation

Answer: Intravenous furosemide

Answer

Intravenous furosemide
The correct answer is intravenous furosemide. This patient is presenting with classic signs of acute decompensated heart failure (ADHF) precipitated by aggressive intravenous fluid resuscitation. The combination of orthopnea (preferring to sit upright), hypoxia, jugular venous distention, bibasilar crackles, a distinct S3 gallop, and lower extremity edema strongly points to severe volume overload leading to acute pulmonary edema. The most appropriate initial step in management for ADHF with signs of volume overload is the administration of an intravenous loop diuretic, such as furosemide. This rapidly decreases intravascular volume, reduces ventricular preload, and relieves pulmonary congestion, thereby improving the patient's respiratory status.

Step-by-Step Solution

1
Analyze the clinical presentation and physical examination findings.
The patient presents with orthopnea, hypoxia, jugular venous distention, bibasilar crackles, and an S3 gallop after receiving aggressive intravenous fluids.
Identifying the constellation of signs and symptoms is necessary to determine the underlying etiology of the new-onset respiratory distress.
2
Establish the most likely diagnosis.
The clinical picture strongly indicates acute decompensated heart failure resulting from iatrogenic volume overload.
Distinguishing cardiogenic pulmonary edema from other causes of inpatient dyspnea directly guides the acute management.
3
Determine the most appropriate initial management.
Intravenous furosemide is selected as the initial treatment.
Loop diuretics are the first-line therapy to rapidly reduce intravascular volume and alleviate pulmonary congestion in acute decompensated heart failure.

Key Concept

Diagnosis and initial management of acute decompensated heart failure presenting with volume overload.
Estimated Time:1m 0s
Question 300Question →

A 62-year-old man presents to the emergency department with sudden-onset, severe, tearing chest pain that radiates directly to his back between his scapulae. The pain started 30 minutes ago while he was watching television. His medical history is significant for poorly controlled essential hypertension and a 40-pack-year smoking history. His temperature is 37.0°C (98.6°F), blood pressure is 210/110 mm Hg in the right arm and 170/95 mm Hg in the left arm, heart rate is 112/min, and respiratory rate is 20/min. Physical examination reveals an early diastolic decrescendo murmur at the right upper sternal border. An electrocardiogram shows sinus tachycardia with no ischemic changes. A chest radiograph reveals a widened mediastinum. Based on the most likely diagnosis, arrange the following management steps in the most appropriate chronological sequence.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequential order for managing suspected acute aortic dissection is to first initiate intravenous beta-blockade, followed by intravenous vasodilator therapy, then obtain confirmatory imaging, and finally obtain a surgical consultation for definitive repair.
The correct sequence prioritizes immediate anti-impulse therapy to prevent aortic rupture, followed by diagnostic confirmation, and ultimately definitive surgical management. Beta-blockers must explicitly precede vasodilators.

Step-by-Step Solution

1
Identify the clinical presentation as highly suspicious for an acute aortic dissection.
The patient has tearing chest pain, asymmetric blood pressures, a widened mediastinum, and a new aortic regurgitation murmur.
Recognizing the classic signs of aortic dissection is necessary to rapidly initiate life-saving anti-impulse therapy.
2
Determine the first priority in medical stabilization.
Heart rate must be lowered first using an intravenous beta-blocker (e.g., esmolol) to a target of < 60/min.
Beta-blockers decrease left ventricular contractility (dP/dt) and reduce the shear stress on the aortic wall, minimizing the chance of further dissection or rupture.
3
Determine the next step in medical stabilization.
Add an intravenous vasodilator (e.g., sodium nitroprusside) to lower systolic blood pressure to 100-120 mm Hg.
Vasodilators must only be given after beta-blockade to prevent reflex sympathetic activation and worsening of the dissection.
4
Determine the role of diagnostic imaging.
Safely transport the hemodynamically optimized patient to obtain a CTA of the chest.
Imaging is necessary to confirm the diagnosis and classify the extent of the dissection (Stanford Type A vs. Type B).
5
Determine the definitive treatment based on presentation.
Consult cardiothoracic surgery.
The early diastolic murmur indicates aortic valve involvement (Stanford Type A), which requires emergent operative repair.

Key Concept

In acute aortic dissection, medical therapy must be sequenced with intravenous beta-blockers administered before vasodilators to prevent reflex tachycardia and increased aortic shear stress, followed by confirmatory imaging and appropriate surgical management.
Estimated Time:1m 30s
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