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Difficulty: HardCardiovascular System

Match each acute cardiovascular clinical presentation with its most characteristic pulmonary artery catheterization (hemodynamic) profile.

  • A patient presenting with hypotension, elevated jugular venous pressure, clear lung fields, and ST-segment elevation in leads II, III, and aVF.Elevated right atrial pressure, normal or low pulmonary capillary wedge pressure, decreased cardiac index, and increased systemic vascular resistance.
  • A patient developing sudden-onset severe respiratory distress, hypotension, and a new harsh holosystolic murmur at the cardiac apex three days after an inferior myocardial infarction.Normal or mildly elevated right atrial pressure, prominently elevated pulmonary capillary wedge pressure with giant v-waves, decreased cardiac index, and increased systemic vascular resistance.
  • A patient with end-stage renal disease presenting with hypotension, tachycardia, distant heart sounds, and a >10>10 mmHg drop in systolic blood pressure during inspiration.Equalization of elevated right atrial pressure, right ventricular diastolic pressure, and pulmonary capillary wedge pressure; decreased cardiac index; and increased systemic vascular resistance.
  • A patient with a large untreated traumatic arteriovenous fistula in the lower extremity presenting with progressive dyspnea, bounding peripheral pulses, and a widened pulse pressure.Normal or elevated right atrial pressure, normal or elevated pulmonary capillary wedge pressure, significantly increased cardiac index, and decreased systemic vascular resistance.

Answer

The correct matches pair acute right ventricular infarction with isolated right-sided pressure elevation; papillary muscle rupture with giant v-waves on PCWP tracing; cardiac tamponade with equalization of diastolic pressures; and an arteriovenous fistula with high-output/low-resistance hemodynamics.
Each pair correctly matches the pathophysiology of the condition to its Swan-Ganz catheterization profile. RV infarction impairs right-sided output, raising RAP but starving the left heart (low PCWP). Papillary muscle rupture creates an acute volume load on the left atrium, dramatically raising PCWP with systolic v-waves. Tamponade exerts uniform external pressure, equalizing RAP and PCWP. AV fistulas create a low-resistance parallel circuit, dropping SVR and forcing a hyperdynamic increased Cardiac Index.

Step-by-Step Solution

1
Diagnose the underlying cardiovascular emergency for each clinical vignette.
Identified Acute RV Infarction, Papillary Muscle Rupture, Cardiac Tamponade, and High-Output Heart Failure.
Accurate clinical diagnosis is required before predicting the resulting hemodynamic derangements.
2
Determine the primary effect on systemic vascular resistance (SVR) and cardiac index (CI) for each condition.
The AV fistula is the only condition that lowers SVR and increases CI (distributive/high-output pattern). The other three represent cardiogenic or obstructive shock, characterized by decreased CI and reflexively increased SVR.
Isolating the high-output state immediately pairs the AV fistula vignette with the high CI / low SVR profile.
3
Analyze right- and left-sided filling pressures to differentiate the remaining three cardiogenic/obstructive shock states.
RV infarction shows isolated right-sided elevation (high RAP, low PCWP). Tamponade shows equalized elevation of both sides (high RAP = high PCWP). Papillary muscle rupture shows prominent left-sided failure (massive PCWP elevation with v-waves).
Filling pressures reflect the specific anatomical location of the cardiac dysfunction or extrinsic compression.

Key Concept

Hemodynamic profiling of shock and acute heart failure states using pulmonary artery catheterization.
Estimated Time:2m 0s
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Topics

Cardiovascular System

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