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Difficulty: HardPhysiological Adaptation

During the immediate postoperative period following a coronary artery bypass grafting (CABG) procedure, the client's mediastinal chest tube drainage abruptly stops. The client becomes increasingly restless and diaphoresis is noted. Which of the following subsequent clinical findings support a developing complication of cardiac tamponade? Select all that apply.

  1. Paradoxical blood pressure drop of 15 mm Hg during inspirationAnswer
  2. B
    Widening arterial pulse pressure
  3. Distant, muffled heart tones upon auscultationAnswer
  4. Jugular venous distention while the head of the bed is elevated at 45 degreesAnswer
  5. E
    Bradycardia with bounding peripheral pulses
  6. F
    Arterial blood gas results demonstrating uncompensated metabolic alkalosis

Answer

The clinical findings that support a diagnosis of cardiac tamponade are a paradoxical blood pressure drop of 15 mm Hg during inspiration, distant and muffled heart tones, and jugular venous distention.
Cardiac tamponade is an acute obstructive shock state caused by fluid accumulation in the pericardium. It restricts ventricular filling, leading to a drop in systolic blood pressure during inspiration greater than 10 mm Hg (pulsus paradoxus). The fluid insulates the heart, causing muffled heart tones. Furthermore, elevated right-sided heart pressures back up into the systemic circulation, causing jugular venous distention.

Step-by-Step Solution

1
Analyze the clinical scenario of abrupt chest tube cessation after open-heart surgery.
The abrupt cessation suggests that blood is no longer draining and is instead accumulating in the pericardial space.
Retained blood in the mediastinum can quickly compress the heart muscle, severely restricting ventricular filling.
2
Identify the classic physiological indicators of an obstructive shock state.
The nurse must recognize the components of Beck's triad (hypotension, muffled heart sounds, jugular venous distention) alongside pulsus paradoxus.
These specific signs directly reflect the mechanical compression of the heart and the subsequent backup of systemic venous return.
3
Differentiate the expected findings from incorrect compensatory mechanisms.
Confirm pulsus paradoxus, muffled tones, and JVD. Reject widening pulse pressure, bradycardia, and metabolic alkalosis.
Shock induces compensatory tachycardia (not bradycardia), a narrowing pulse pressure (not widening), and metabolic acidosis due to tissue hypoxia (not alkalosis).

Key Concept

Cardiac Tamponade and Obstructive Shock
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Topics

Physiological Adaptation

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