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Difficulty: MediumPhysiological Adaptation

A nurse is assessing a client who is recovering in the intensive care unit following a coronary artery bypass graft (CABG) surgery. Which of the following clinical findings should indicate to the nurse that the client is developing cardiac tamponade? Select all that apply.

  1. Distant, muffled heart sounds upon auscultationAnswer
  2. Distended neck veins while the head of the bed is elevated at 45 degreesAnswer
  3. A drop in systolic blood pressure of 15 mm Hg during inspirationAnswer
  4. D
    A widening difference between the systolic and diastolic blood pressure
  5. E
    An abrupt and significant increase in mediastinal chest tube drainage

Answer

The correct findings are distant, muffled heart sounds, distended neck veins while the head of the bed is elevated, and a drop in systolic blood pressure of 15 mm Hg during inspiration.
Cardiac tamponade is a life-threatening complication where fluid or blood rapidly accumulates in the pericardial space, severely restricting ventricular filling and causing obstructive shock. The classic presentation, known as Beck's triad, includes distant or muffled heart sounds (due to fluid muffling the sound), jugular venous distension (due to impaired right ventricular filling causing systemic venous congestion), and hypotension. Another hallmark sign is pulsus paradoxus, which is an exaggerated drop in systolic blood pressure (greater than 10 mm Hg) during inspiration.

Step-by-Step Solution

1
Analyze the client's postoperative context and the pathophysiology of cardiac tamponade.
Cardiac tamponade involves fluid or blood accumulating in the pericardial sac, which compresses the heart and restricts ventricular filling (obstructive shock).
Understanding the mechanism helps identify the resulting hemodynamic changes.
2
Evaluate each option against the expected signs of cardiac tamponade (Beck's triad and pulsus paradoxus).
Muffled heart sounds, jugular venous distension, and pulsus paradoxus (systolic drop greater than 10 mm Hg during inspiration) are classic signs.
These findings directly reflect the fluid accumulation and increased intrapericardial pressure.
3
Identify and exclude findings that contradict the pathophysiology of tamponade.
Widening pulse pressure and increased chest tube drainage are excluded. Tamponade causes a narrowing pulse pressure, and it often occurs when chest tube drainage suddenly stops.
Accurate clinical judgment requires distinguishing true complications from unrelated or opposite signs.

Key Concept

Recognition of Cardiac Tamponade
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Topics

Physiological Adaptation

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