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ABIM Critical Care practice questions

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Question 1Respiratory Disorders and Mechanical Ventilation

A patient with acute respiratory distress syndrome is being managed with lung-protective ventilation. Which ventilator strategy has been shown to reduce mortality in this population?

  1. Low tidal volume ventilation targeting plateau pressure below 30 cm H2O Correct answer.
  2. Routine prone positioning for all patients regardless of oxygenation
  3. High tidal volume ventilation to maximize alveolar recruitment
  4. Permissive hyperoxia targeting PaO2 above 200 mm Hg

Explanation

Lung-protective ventilation with tidal volumes around 6 mL/kg predicted body weight and plateau pressure ≤30 cm H2O reduces mortality in ARDS. The benefit derives from limiting ventilator-induced lung injury from overdistension and cyclic collapse.

Question 2Respiratory Disorders and Mechanical Ventilation

Which finding best supports a diagnosis of chronic obstructive pulmonary disease on spirometry?

  1. A restrictive pattern with reduced total lung capacity
  2. A reduced diffusing capacity with a normal FEV1/FVC ratio
  3. A post-bronchodilator FEV1/FVC ratio below 0.70 Correct answer.
  4. An increased residual volume with a normal total lung capacity

Explanation

Airflow obstruction that persists after bronchodilator administration, defined as FEV1/FVC below 0.70, is the spirometric hallmark of COPD. Restrictive disease instead shows preserved or increased ratio with reduced lung volumes.

Question 3Respiratory Disorders and Mechanical Ventilation

A mechanically ventilated patient has a peak airway pressure of 45 cm H2O and a plateau pressure of 20 cm H2O. What does this gradient most suggest?

  1. Increased airway resistance Correct answer.
  2. Decreased lung compliance
  3. Increased chest wall elastance
  4. Pulmonary edema

Explanation

The difference between peak and plateau pressure reflects resistive pressure losses along the airways. A wide gradient with a normal plateau indicates increased resistance such as bronchospasm or a kinked tube.

Question 4Respiratory Disorders and Mechanical Ventilation

Which intervention is first-line for a patient with an acute exacerbation of asthma and impending respiratory failure who is not improving with inhaled bronchodilators?

  1. Intravenous magnesium sulfate Correct answer.
  2. Oral montelukast
  3. Prophylactic antibiotics
  4. Inhaled ipratropium as monotherapy

Explanation

Intravenous magnesium sulfate provides smooth muscle relaxation and is recommended as an adjunct in severe asthma exacerbations not responding to standard therapy. It is added after inhaled beta-agonists and anticholinergics plus systemic corticosteroids.

Question 5Respiratory Disorders and Mechanical Ventilation

A patient is intubated for respiratory failure. Which parameter best guides the initial setting of positive end-expiratory pressure?

  1. The severity of hypoxemia and the need for alveolar recruitment Correct answer.
  2. The patient's serum bicarbonate level
  3. The peak inspiratory flow rate
  4. The patient's body mass index

Explanation

PEEP is titrated to improve oxygenation and prevent alveolar collapse, guided by the degree of hypoxemia and the recruitment response. It is balanced against hemodynamic compromise and barotrauma.

Question 6Respiratory Disorders and Mechanical Ventilation

A patient with a large spontaneous pneumothorax develops sudden hypotension and tracheal deviation. What is the most appropriate immediate management?

  1. Emergent chest radiograph before any intervention
  2. Needle decompression followed by tube thoracostomy Correct answer.
  3. High-flow nasal cannula and observation
  4. Intravenous fluids and vasopressors alone

Explanation

Tension pneumothorax is a clinical diagnosis requiring immediate needle decompression followed by definitive tube thoracostomy. Delay for imaging risks cardiovascular collapse.

Question 7Respiratory Disorders and Mechanical Ventilation

Which statement about noninvasive positive pressure ventilation in acute exacerbation of COPD is correct?

  1. It is most effective when the pH is below 7.10
  2. It is contraindicated in all patients with hypercapnia
  3. It should replace bronchodilator therapy
  4. It reduces intubation rates and mortality when used early in respiratory acidosis Correct answer.

Explanation

Noninvasive ventilation reduces the need for intubation and improves survival in COPD exacerbations with acute hypercapnic respiratory acidosis. It is used alongside bronchodilators and corticosteroids.

Question 8Respiratory Disorders and Mechanical Ventilation

A patient with acute respiratory distress syndrome has a PaO2 of 60 mm Hg on FiO2 of 1.0 and PEEP of 12 cm H2O. Which adjunctive measure has the strongest evidence for improving survival in this scenario?

  1. Inhaled nitric oxide
  2. Extracorporeal membrane oxygenation as first-line therapy
  3. High-frequency oscillatory ventilation
  4. Prone positioning for prolonged sessions Correct answer.

Explanation

Prolonged prone positioning improves survival in moderate-to-severe ARDS by recruiting dorsal lung regions and reducing ventilator-induced injury. It is recommended for patients with severe hypoxemia despite optimized ventilation.

Question 9Respiratory Disorders and Mechanical Ventilation

Which measurement is used to assess the work of breathing and respiratory muscle strength at the bedside in a spontaneously breathing patient?

  1. Maximum inspiratory pressure Correct answer.
  2. Airway resistance
  3. Functional residual capacity
  4. Peak expiratory flow rate

Explanation

Maximum inspiratory pressure reflects inspiratory muscle strength and is used to assess respiratory muscle capacity. It helps identify patients at risk of ventilatory failure.

Question 10Respiratory Disorders and Mechanical Ventilation

A ventilated patient with sepsis has a rising plateau pressure and bilateral infiltrates. Which intervention best reduces the risk of ventilator-induced lung injury?

  1. Increasing PEEP to 20 cm H2O in all patients
  2. Reducing tidal volume to approximately 6 mL/kg predicted body weight Correct answer.
  3. Increasing tidal volume to improve carbon dioxide clearance
  4. Using pressure support mode exclusively

Explanation

Lowering tidal volume to about 6 mL/kg predicted body weight limits alveolar overdistension and reduces ventilator-induced lung injury. Plateau pressure should be kept at or below 30 cm H2O.

Question 11Respiratory Disorders and Mechanical Ventilation

Which of the following is the most common cause of ventilator-associated pneumonia?

  1. Mycobacterium tuberculosis
  2. Aspergillus fumigatus
  3. Gram-negative bacilli such as Pseudomonas aeruginosa Correct answer.
  4. Streptococcus pneumoniae

Explanation

Ventilator-associated pneumonia is most often caused by aerobic gram-negative bacilli, including Pseudomonas aeruginosa, reflecting colonization of the oropharynx and endotracheal tube. Empiric therapy targets these organisms.

Question 12Respiratory Disorders and Mechanical Ventilation

A patient with a pulmonary embolism is hemodynamically stable with preserved right ventricular function. What is the preferred initial anticoagulation strategy?

  1. Inferior vena cava filter placement
  2. Systemic thrombolysis
  3. Observation without anticoagulation
  4. Therapeutic parenteral anticoagulation with a low-molecular-weight heparin Correct answer.

Explanation

Hemodynamically stable pulmonary embolism without right ventricular dysfunction is treated with therapeutic anticoagulation, often starting with low-molecular-weight heparin. Thrombolysis is reserved for hemodynamic instability.

Question 13Respiratory Disorders and Mechanical Ventilation

Which finding is characteristic of a simple pleural effusion on pleural fluid analysis?

  1. Chylomicrons in the fluid
  2. A transudate with low protein and low lactate dehydrogenase Correct answer.
  3. An exudate with elevated adenosine deaminase
  4. A pH below 7.00 with positive Gram stain

Explanation

Transudative effusions result from hydrostatic or oncotic imbalances and show low protein and low lactate dehydrogenase. Exudates instead reflect inflammation or malignancy.

Question 14Respiratory Disorders and Mechanical Ventilation

A patient with myasthenia gravis develops respiratory failure. Which bedside parameter best predicts the need for mechanical ventilation?

  1. An oxygen saturation of 96 percent on room air
  2. A peak expiratory flow above 60 percent predicted
  3. A respiratory rate of 12 breaths per minute
  4. A negative inspiratory force weaker than -20 cm H2O Correct answer.

Explanation

Respiratory muscle weakness in neuromuscular disease is assessed with negative inspiratory force and vital capacity. A negative inspiratory force weaker than -20 to -30 cm H2O signals impending ventilatory failure.

Question 15Respiratory Disorders and Mechanical Ventilation

Which oxygen delivery device provides the highest and most reliable fraction of inspired oxygen?

  1. A nasal cannula at 6 L/min
  2. A nonrebreather mask with a reservoir Correct answer.
  3. A simple face mask at 5 L/min
  4. A Venturi mask at 28 percent

Explanation

A nonrebreather mask with a reservoir delivers the highest inspired oxygen fraction, approaching 80 to 95 percent. Lower-flow devices provide less predictable and lower fractions.

Question 16Respiratory Disorders and Mechanical Ventilation

A patient with acute respiratory distress syndrome is being evaluated for weaning. Which parameter best predicts successful liberation from mechanical ventilation?

  1. A positive end-expiratory pressure of 10 cm H2O
  2. A PaO2/FiO2 ratio of 150
  3. A rapid shallow breathing index below 105 Correct answer.
  4. A tidal volume of 200 mL

Explanation

The rapid shallow breathing index, the ratio of respiratory rate to tidal volume, predicts weaning success when below about 105 breaths/min/L. Higher values indicate a high respiratory demand relative to capacity.

Question 17Respiratory Disorders and Mechanical Ventilation

Which intervention is recommended to prevent ventilator-associated pneumonia in intubated patients?

  1. Routine prophylactic broad-spectrum antibiotics
  2. Routine circuit changes every 24 hours
  3. Daily chest radiographs
  4. Elevating the head of the bed to 30 to 45 degrees Correct answer.

Explanation

Semirecumbent positioning reduces aspiration of oropharyngeal secretions and is a core component of VAP prevention bundles. Other measures include sedation interruption and oral care.

Question 18Respiratory Disorders and Mechanical Ventilation

A patient with severe community-acquired pneumonia has a CURB-65 score of 4. What is the most appropriate disposition?

  1. Outpatient management with oral antibiotics
  2. Admission to an intensive care unit Correct answer.
  3. Discharge with a follow-up appointment in one week
  4. Home oxygen therapy alone

Explanation

A CURB-65 score of 3 or more indicates severe pneumonia with high mortality, warranting hospitalization and often intensive care. Scores of 0 to 1 generally allow outpatient care.

Question 19Respiratory Disorders and Mechanical Ventilation

Which mechanism best explains hypoxemia in a patient with a large intracardiac right-to-left shunt?

  1. Diffusion limitation
  2. Shunt physiology that does not correct with supplemental oxygen Correct answer.
  3. Low inspired oxygen partial pressure
  4. Alveolar hypoventilation

Explanation

Blood bypassing ventilated alveoli through a true shunt cannot participate in gas exchange, so hypoxemia is poorly responsive to supplemental oxygen. This distinguishes shunt from other causes of hypoxemia.

Question 20Respiratory Disorders and Mechanical Ventilation

A patient is receiving mechanical ventilation in the assist-control mode. Which statement about this mode is correct?

  1. The ventilator delivers breaths only when the patient is apneic
  2. Only spontaneous breaths are supported with pressure
  3. The patient controls all tidal volumes
  4. Every breath receives the set tidal volume whether triggered by the patient or the ventilator Correct answer.

Explanation

In assist-control mode, each breath, whether patient-triggered or machine-triggered, receives the set tidal volume. This guarantees a minimum minute ventilation but may cause respiratory alkalosis if the patient triggers frequently.

Question 21Respiratory Disorders and Mechanical Ventilation

A patient with a large pleural effusion undergoes thoracentesis and develops re-expansion pulmonary edema. Which factor most increases the risk of this complication?

  1. Use of a small-bore catheter
  2. Administration of supplemental oxygen
  3. Removal of a large volume of fluid in a single session Correct answer.
  4. Slow drainage over several hours

Explanation

Rapid removal of large volumes of pleural fluid increases the risk of re-expansion pulmonary edema. Limiting drainage per session reduces this risk.

Question 22Respiratory Disorders and Mechanical Ventilation

Which arterial blood gas finding is most consistent with acute respiratory alkalosis?

  1. Low pH with low bicarbonate
  2. Low pH with elevated PaCO2
  3. Elevated pH with elevated bicarbonate
  4. Elevated pH with low PaCO2 Correct answer.

Explanation

Acute respiratory alkalosis results from hyperventilation, which lowers PaCO2 and raises pH. Renal compensation would later lower bicarbonate.

Question 23Respiratory Disorders and Mechanical Ventilation

A patient with obstructive sleep apnea is being evaluated. Which finding on nocturnal polysomnography defines the severity of the disorder?

  1. The total sleep time
  2. The apnea-hypopnea index Correct answer.
  3. The number of arousals per hour of REM sleep
  4. The oxygen saturation nadir alone

Explanation

The apnea-hypopnea index, the number of apneas and hypopneas per hour of sleep, classifies severity. Higher indices indicate more severe disease.

Question 24Respiratory Disorders and Mechanical Ventilation

A patient with acute respiratory failure from pneumonia has a PaO2 of 55 mm Hg despite a high-flow nasal cannula. What is the most appropriate next step?

  1. Obtaining a repeat chest radiograph in 6 hours
  2. Endotracheal intubation and mechanical ventilation Correct answer.
  3. Starting oral corticosteroids
  4. Increasing the nasal cannula flow further

Explanation

Persistent hypoxemia despite high-flow oxygen support indicates failure of noninvasive therapy and the need for definitive airway management. Delaying intubation increases the risk of decompensation.

Question 25Respiratory Disorders and Mechanical Ventilation

Which statement about the use of corticosteroids in acute respiratory distress syndrome is most accurate?

  1. They are contraindicated in ARDS
  2. They are routinely recommended for all patients with ARDS
  3. They may be considered in selected patients but are not standard therapy for all ARDS Correct answer.
  4. They reliably reduce mortality in mild ARDS

Explanation

Corticosteroid use in ARDS remains selective, with evidence not supporting routine administration for all patients. Decisions are individualized based on etiology and timing.

Question 26Respiratory Disorders and Mechanical Ventilation

A 58-year-old man is intubated for status asthmaticus. The ventilator is set to volume control, and the peak airway pressure is 52 cm H2O while the plateau pressure is 18 cm H2O. Which of the following best explains this pressure difference?

  1. Reduced chest wall compliance
  2. Decreased lung compliance
  3. Elevated airway resistance Correct answer.
  4. Auto-PEEP

Explanation

The difference between peak and plateau pressure reflects the resistive pressure drop across the airways; a wide gap (here about 34 cm H2O) indicates high airway resistance, as seen in bronchospasm. Plateau pressure itself reflects alveolar and chest wall compliance, so a normal plateau points away from a compliance problem.

Question 27Respiratory Disorders and Mechanical Ventilation

A 45-year-old woman with Guillain-Barré syndrome is being monitored for respiratory failure. Her forced vital capacity is 1.8 L, but she is unable to generate a maximal inspiratory pressure better than -20 cm H2O. Which conclusion is most appropriate?

  1. The forced vital capacity excludes impending respiratory failure
  2. Respiratory muscle strength is inadequate and intubation should be considered Correct answer.
  3. The maximal inspiratory pressure is falsely low from poor effort
  4. Noninvasive ventilation is contraindicated in this condition

Explanation

A maximal inspiratory pressure less negative than -20 to -30 cm H2O indicates significant inspiratory muscle weakness and predicts ventilatory failure, even when vital capacity is not yet critically low. Bedside measures of muscle strength such as MIP and vital capacity should be interpreted together.

Question 28Respiratory Disorders and Mechanical Ventilation

A 62-year-old man with severe COPD is ventilated in volume control. The set respiratory rate is 12/min, but the total displayed rate is 26/min and the patient appears to be triggering many breaths. Which strategy best addresses this patient-ventilator asynchrony?

  1. Increase the set tidal volume
  2. Increase the inspiratory flow rate and shorten the rise time Correct answer.
  3. Decrease the trigger sensitivity threshold
  4. Prolong the inspiratory time

Explanation

A high total rate with frequent patient triggering in an obstructive patient often reflects flow starvation, in which the set inspiratory flow is too low for the patient's demand. Increasing peak flow and adjusting rise time matches the patient's demand and reduces triggering.

Question 29Cardiovascular Disorders and Hemodynamic Monitoring

A 62-year-old man with septic shock has a central venous pressure of 14 mmHg and a bedside echocardiogram showing a dilated, non-collapsing inferior vena cava with reduced respiratory variation. Which interpretation is most accurate?

  1. CVP of 14 mmHg confirms intravascular volume depletion
  2. He is likely fluid responsive and should receive a bolus
  3. The CVP and IVC findings suggest elevated right atrial pressure and poor fluid tolerance Correct answer.
  4. The IVC appearance reliably predicts cardiac output improvement after fluids

Explanation

A high CVP with a dilated, non-collapsing IVC indicates elevated right-sided pressures, suggesting the patient is unlikely to be fluid responsive and may tolerate fluids poorly. Static measures such as CVP and IVC diameter are poor predictors of fluid responsiveness.

Question 30Cardiovascular Disorders and Hemodynamic Monitoring

Which hemodynamic profile is most characteristic of cardiogenic shock?

  1. High cardiac index, high PCWP, low SVR
  2. Low cardiac index, low PCWP, high SVR
  3. Low cardiac index, high PCWP, high SVR Correct answer.
  4. High cardiac index, low PCWP, low SVR

Explanation

Cardiogenic shock is defined by pump failure producing a low cardiac index, elevated filling pressures (high PCWP), and compensatory vasoconstriction with high systemic vascular resistance.

Question 31Cardiovascular Disorders and Hemodynamic Monitoring

A patient in the ICU has a pulmonary artery catheter in place. The pulmonary artery occlusion (wedge) pressure is used primarily to estimate which variable?

  1. Systemic vascular resistance
  2. Left ventricular end-diastolic pressure Correct answer.
  3. Right ventricular end-diastolic volume
  4. Pulmonary vascular resistance

Explanation

When the balloon is inflated, the catheter measures pressure transmitted retrograde from the left atrium, which estimates left ventricular end-diastolic pressure and thus left-sided filling.

Question 32Cardiovascular Disorders and Hemodynamic Monitoring

Which finding on arterial waveform analysis is most consistent with pulsus paradoxus?

  1. Loss of the dicrotic notch
  2. An exaggerated inspiratory drop in systolic pressure greater than 10 mmHg Correct answer.
  3. A widened pulse pressure with each inspiration
  4. Systolic pressure variation less than 5 mmHg with respiration

Explanation

Pulsus paradoxus is an exaggeration of the normal inspiratory fall in systolic pressure, typically greater than 10 mmHg, classically seen in cardiac tamponade and severe obstructive lung disease.

Question 33Cardiovascular Disorders and Hemodynamic Monitoring

A 58-year-old woman presents with hypotension, distended neck veins, and muffled heart sounds. Bedside ultrasound shows a large pericardial effusion with right ventricular diastolic collapse. Which intervention is most appropriate for immediate stabilization?

  1. Aggressive intravenous diuresis
  2. Positive pressure ventilation initiation
  3. Emergent pericardiocentesis Correct answer.
  4. Norepinephrine infusion as definitive therapy

Explanation

This presentation is cardiac tamponade, and urgent drainage via pericardiocentesis is the definitive stabilizing therapy. Volume loading and vasopressors are temporizing only.

Question 34Cardiovascular Disorders and Hemodynamic Monitoring

A patient with acute decompensated heart failure and a reduced ejection fraction remains hypotensive with a cardiac index of 1.7 L/min/m2 and PCWP of 28 mmHg. Which agent is most appropriate?

  1. Intravenous furosemide alone
  2. Intravenous nitroglycerin alone
  3. Phenylephrine infusion
  4. Dobutamine infusion Correct answer.

Explanation

In low-output heart failure with elevated filling pressures and hypotension, an inotrope such as dobutamine improves contractility and cardiac output while modestly reducing afterload.

Question 35Cardiovascular Disorders and Hemodynamic Monitoring

Which parameter best reflects the adequacy of tissue perfusion in a patient with septic shock?

  1. Urine specific gravity
  2. Central venous pressure
  3. Serum lactate clearance Correct answer.
  4. Mixed venous oxygen saturation alone

Explanation

Lactate clearance over time reflects resolution of global tissue hypoperfusion and is a validated marker of resuscitation adequacy in septic shock.

Question 36Cardiovascular Disorders and Hemodynamic Monitoring

A patient has a mean arterial pressure of 55 mmHg with a cardiac index of 2.2 L/min/m2. What is the calculated systemic vascular resistance in dynes·s·cm-5 (using SVR = [MAP - CVP] × 80 / CO, assuming CVP 5 mmHg and BSA 1.8 m2)?

  1. Approximately 600 dynes·s·cm-5
  2. Approximately 1800 dynes·s·cm-5
  3. Approximately 1000 dynes·s·cm-5 Correct answer.
  4. Approximately 2500 dynes·s·cm-5

Explanation

Cardiac output is CI × BSA = 2.2 × 1.8 ≈ 4.0 L/min. SVR = (55 - 5) × 80 / 4.0 = 50 × 80 / 4.0 = 1000 dynes·s·cm-5.

Question 37Cardiovascular Disorders and Hemodynamic Monitoring

Which echocardiographic finding suggests cardiac tamponade physiology?

  1. Left ventricular hypertrophy
  2. Mitral annular calcification
  3. Right atrial systolic collapse and RV diastolic collapse Correct answer.
  4. Aortic root dilation

Explanation

In tamponade, elevated pericardial pressure causes right atrial systolic collapse and right ventricular diastolic collapse, which are sensitive echocardiographic signs.

Question 38Cardiovascular Disorders and Hemodynamic Monitoring

A patient with a large anterior myocardial infarction develops new hypotension, pulmonary edema, and a new holosystolic murmur. Which complication is most likely?

  1. Left ventricular aneurysm
  2. Pericarditis
  3. Right ventricular infarction
  4. Papillary muscle rupture with acute mitral regurgitation Correct answer.

Explanation

Acute mitral regurgitation from papillary muscle rupture after an inferior or anterior MI presents with abrupt hypotension, pulmonary edema, and a new systolic murmur.

Question 39Cardiovascular Disorders and Hemodynamic Monitoring

Which ECG finding is most specific for acute pericarditis?

  1. Reciprocal ST depression in all leads
  2. Diffuse ST-segment elevation with PR depression Correct answer.
  3. QT interval prolongation
  4. New left bundle branch block

Explanation

Acute pericarditis classically produces diffuse concave ST elevation with PR-segment depression across multiple territories, reflecting epicardial inflammation.

Question 40Cardiovascular Disorders and Hemodynamic Monitoring

A patient with massive pulmonary embolism is hypotensive with a normal PCWP and elevated right atrial pressure. Which therapy is most appropriate for hemodynamic stabilization?

  1. Diuresis to reduce right heart pressures
  2. Beta-blockade to reduce oxygen demand
  3. Aggressive fluid loading of several liters
  4. Systemic thrombolysis Correct answer.

Explanation

In massive (high-risk) pulmonary embolism with hemodynamic instability, systemic thrombolysis is indicated to reduce clot burden and relieve right ventricular failure.

Question 41Cardiovascular Disorders and Hemodynamic Monitoring

Which is the most reliable dynamic predictor of fluid responsiveness in a mechanically ventilated patient in sinus rhythm?

  1. Urine output
  2. Central venous pressure
  3. Serum lactate
  4. Pulse pressure variation Correct answer.

Explanation

Pulse pressure variation during positive pressure ventilation reflects stroke volume variation and is a validated dynamic predictor of fluid responsiveness when the patient is adequately sedated and in sinus rhythm.

Question 42Cardiovascular Disorders and Hemodynamic Monitoring

A patient in the ICU has a pulmonary artery catheter. Which value is used to calculate the transpulmonary gradient for pulmonary vascular resistance?

  1. PCWP minus CVP
  2. Mean pulmonary artery pressure minus PCWP Correct answer.
  3. Systolic pulmonary artery pressure minus CVP
  4. Mean arterial pressure minus CVP

Explanation

The transpulmonary gradient is mean pulmonary artery pressure minus pulmonary artery occlusion (wedge) pressure, and dividing by cardiac output yields pulmonary vascular resistance.

Question 43Cardiovascular Disorders and Hemodynamic Monitoring

Which finding is most consistent with right ventricular infarction complicating an inferior myocardial infarction?

  1. Diffuse ST elevation with PR depression
  2. Pulmonary edema with normal JVP
  3. Elevated JVP with clear lungs and hypotension Correct answer.
  4. New holosystolic murmur with pulmonary edema

Explanation

Right ventricular infarction produces right-sided failure with elevated JVP but clear lungs, along with hypotension that may worsen with nitrates.

Question 44Cardiovascular Disorders and Hemodynamic Monitoring

A patient with severe aortic stenosis becomes hypotensive in the ICU. Which intervention is most appropriate for initial hemodynamic support?

  1. Nitroprusside infusion
  2. Rapid intravenous fluid bolus of 2 liters
  3. Aggressive diuresis
  4. Phenylephrine infusion Correct answer.

Explanation

In severe aortic stenosis, maintaining afterload and coronary perfusion is critical; a vasopressor such as phenylephrine supports blood pressure without excessive tachycardia.

Question 45Cardiovascular Disorders and Hemodynamic Monitoring

Which parameter is used to calculate cardiac index?

  1. Cardiac output multiplied by heart rate
  2. Cardiac output divided by body surface area Correct answer.
  3. Stroke volume divided by body surface area
  4. Mean arterial pressure divided by cardiac output

Explanation

Cardiac index normalizes cardiac output to body size by dividing by body surface area, allowing comparison across patients of different sizes.

Question 46Cardiovascular Disorders and Hemodynamic Monitoring

A patient with septic shock has been resuscitated and now has a ScvO2 of 80% with persistent hypotension and a normal lactate. Which interpretation is most likely?

  1. Ongoing hypovolemia requiring additional fluid
  2. Impaired oxygen utilization or shunting with adequate or excess delivery Correct answer.
  3. Severe anemia as the primary cause
  4. Inadequate oxygen delivery requiring more transfusion

Explanation

A high central venous oxygen saturation in resuscitated septic shock often reflects impaired oxygen extraction or microcirculatory shunting rather than inadequate delivery.

Question 47Cardiovascular Disorders and Hemodynamic Monitoring

Which is a recognized limitation of using central venous pressure to guide fluid resuscitation?

  1. It directly measures left ventricular end-diastolic volume
  2. It correlates poorly with fluid responsiveness across a population Correct answer.
  3. It cannot be measured in the ICU
  4. It is unaffected by mechanical ventilation

Explanation

CVP correlates poorly with volume status and fluid responsiveness across patients because it is influenced by ventricular compliance, intrathoracic pressure, and other factors.

Question 48Cardiovascular Disorders and Hemodynamic Monitoring

A patient develops sudden cardiovascular collapse during central line placement with hypotension, distended neck veins, and tracheal deviation. Which is the most appropriate immediate action?

  1. Emergent pericardiocentesis
  2. Administration of a fluid bolus
  3. Needle decompression of the pleural space Correct answer.
  4. Initiation of broad-spectrum antibiotics

Explanation

Tension pneumothorax causes obstructive shock with tracheal deviation and distended neck veins, and immediate needle decompression is life-saving.

Question 49Cardiovascular Disorders and Hemodynamic Monitoring

Which agent is most appropriate for rate control in a hemodynamically stable patient with atrial fibrillation and a reduced ejection fraction?

  1. Intravenous diltiazem
  2. Intravenous verapamil
  3. Intravenous metoprolol Correct answer.
  4. Oral digoxin loading

Explanation

Beta-blockers such as metoprolol are preferred for rate control when ejection fraction is reduced, because nondihydropyridine calcium channel blockers depress contractility.

Question 50Cardiovascular Disorders and Hemodynamic Monitoring

A patient with acute decompensated heart failure has a PCWP of 30 mmHg, cardiac index of 2.0 L/min/m2, and adequate blood pressure. Which therapy is most appropriate?

  1. Dobutamine alone with no diuretic
  2. Rapid 3-liter crystalloid bolus
  3. Intravenous furosemide with nitroglycerin Correct answer.
  4. Phenylephrine infusion

Explanation

In hypertensive or normotensive acute decompensated heart failure with elevated filling pressures, diuresis combined with vasodilators reduces preload and afterload and improves symptoms.