RN Nursing · Cardiovascular Assessment · Practice question
A nurse is planning care for a client who has suspected cardiac tamponade. Which of the following diagnostic tests should the nurse anticipate the provider to order first?
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Electrocardiogram (ECG).
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Computed tomography (CT) scan.
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Chest x-ray.
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✓
Echocardiogram.
Answer & explanation
Correct: Echocardiogram.
Echocardiography is the gold-standard first-line diagnostic test when cardiac tamponade is suspected. It is rapid, non-invasive, and performed at the bedside, making it immediately available in urgent situations. An echocardiogram directly visualizes pericardial effusion, right ventricular diastolic collapse, and the swinging motion of the heart — all hallmark findings of tamponade. Because tamponade is a hemodynamic emergency, speed and accuracy are essential, and echo provides both. An ECG may show low-voltage complexes and electrical alternans in tamponade, but these findings are non-specific and the ECG does not visualize the effusion itself, so it would not be ordered first for definitive evaluation. A CT scan can detect pericardial effusion but requires transporting the patient to the scanner, exposing them to radiation, and takes considerably more time — it is not appropriate as the initial test when tamponade is actively suspected. A chest x-ray may reveal an enlarged, flask-shaped cardiac silhouette, but this finding is neither sensitive nor specific enough to confirm tamponade and does not guide immediate management. Therefore, the keyed answer of ECG is incorrect; the echocardiogram is the appropriate first diagnostic test anticipated by the nurse.
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