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Difficulty: MediumPhysical Examination Findings

A 62-year-old man with a history of end-stage renal disease on hemodialysis presents to the emergency department with two days of sharp, positional chest pain that has now progressed to severe dyspnea and dizziness. He has missed his last two dialysis sessions. His temperature is 37.8°C (100.0°F), blood pressure is 86/70 mm Hg, pulse is 122/min, and respirations are 26/min. The patient appears anxious and uncomfortable, leaning forward in bed. His extremities are cool. An electrocardiogram reveals sinus tachycardia with low voltage QRS complexes and electrical alternans. Based on the most likely diagnosis, which of the following physical examination findings are most likely to be present in this patient? (Select all that apply)

  1. Decrease in systolic blood pressure by more than 10 mm Hg during normal inspirationAnswer
  2. Distant and muffled heart sounds on precordial auscultationAnswer
  3. Elevated jugular venous pressure with a loss of the y descentAnswer
  4. D
    Paradoxical rise in jugular venous pressure during normal inspiration
  5. E
    Bibasilar fine crackles heard during the late inspiratory phase
  6. F
    Prominent, early diastolic extra heart sound heard just after the second heart sound

Answer

The correct physical examination findings are a decrease in systolic blood pressure by more than 10 mm Hg during normal inspiration (pulsus paradoxus), distant and muffled heart sounds, and elevated jugular venous pressure with a loss of the y descent.
The patient's clinical presentation (uremic pericarditis) and ECG findings (low voltage QRS and electrical alternans) are highly specific for cardiac tamponade. Cardiac tamponade physiology is characterized by the compression of cardiac chambers by tense pericardial fluid. This manifests on physical examination with Beck's triad (hypotension, elevated jugular venous pressure, and muffled heart sounds). The increased external pressure restricts ventricular filling throughout all of diastole, which blunts or completely eliminates the y descent on the jugular venous waveform. Furthermore, because the overall cardiac volume is fixed by the tense pericardial sac, increased right ventricular filling during inspiration causes the interventricular septum to bow to the left. This dramatically decreases left ventricular stroke volume, leading to an exaggerated drop in systolic blood pressure of greater than 10 mm Hg (pulsus paradoxus).

Step-by-Step Solution

1
Analyze the clinical presentation.
The patient has end-stage renal disease, missed dialysis, and presents with positional chest pain, hypotension, tachycardia, electrical alternans, and low voltage QRS complexes.
Identifying these findings points directly to uremic pericarditis complicated by acute cardiac tamponade.
2
Recall the pathophysiology of the condition.
Accumulation of pericardial fluid under high pressure compresses all cardiac chambers throughout the cardiac cycle, severely impairing diastolic filling.
Understanding the continuous external compression allows for the deduction of specific hemodynamic and physical examination signs.
3
Correlate pathophysiology with physical examination findings.
The fluid accumulation causes muffled heart sounds. Exaggerated ventricular interdependence causes pulsus paradoxus. Continuous diastolic compression prevents rapid early ventricular filling, eliminating the y descent on the jugular venous waveform.
These specific signs strictly distinguish cardiac tamponade from other causes of right-sided heart failure and other pericardial diseases.

Key Concept

Physical examination findings characteristic of acute cardiac tamponade.
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Topics

Physical Examination Findings

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