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?

Computed tomography (CT) scan

Chest x-ray

Echocardiogram

Electrocardiogram (ECG)

Answer and Explanation

The Correct Answer is C

A) Computed tomography (CT) scan: A CT scan may provide detailed images of the heart and surrounding structures, but it is not typically the initial diagnostic test used to assess for cardiac tamponade. CT scans are often used in conjunction with other diagnostic tests but are not the first-line investigation for suspected tamponade.

B) Chest x-ray: While a chest x-ray may show signs of cardiac tamponade, such as an enlarged cardiac silhouette or evidence of fluid accumulation around the heart, it is not as sensitive or specific as other diagnostic tests, particularly in the acute setting. Chest x-rays may be obtained as part of the diagnostic workup, but they are not the first-line test for suspected tamponade.

C) Echocardiogram: An echocardiogram is the most appropriate initial diagnostic test for suspected cardiac tamponade. It provides real-time imaging of the heart and can detect pericardial effusion, collapse of the right atrium and ventricle during diastole (diastolic collapse), and signs of hemodynamic compromise. Echocardiography allows for rapid assessment at the bedside and can guide immediate management decisions.

D) Electrocardiogram (ECG): While an electrocardiogram may show nonspecific changes in cardiac tamponade, such as low-voltage QRS complexes or electrical alternans, it is not as sensitive or specific as an echocardiogram for diagnosing tamponade. ECG findings may support the diagnosis but are not typically the first-line test for suspected tamponade.

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Correct Answer is B

Explanation

A. Elevated erythrocyte sedimentation rate (ESR): Elevated ESR indicates inflammation in the body and is not typically associated with the cause of atrial fibrillation.

B. Elevated thyroid-stimulating hormone (TSH): This is the correct answer. A common cause of atrial fibrillation is hyperthyroidism, which is characterized by an overactive thyroid gland and often presents with elevated TSH levels. Thyroid hormones play a significant role in regulating heart rate and rhythm. Excess thyroid hormone can lead to increased heart rate and irregular heart rhythms, including atrial fibrillation.

C. Elevated brain natriuretic peptide (BNP): Elevated BNP levels are associated with heart failure and may indicate cardiac stress or dysfunction. While heart failure can predispose individuals to atrial fibrillation, elevated BNP levels themselves are not a direct cause of atrial fibrillation.

D. Elevated C-reactive protein (CRP): Elevated CRP levels indicate inflammation in the body and are associated with various cardiovascular diseases. While inflammation can contribute to atrial fibrillation, elevated CRP levels alone are not a direct cause of atrial fibrillation.

A. "Distributive shock occurs due to loss of myocardial contractility." B. "Distributive shock occurs due to loss of blood volume." C. "Distributive shock occurs due to systemic vasodilation." D. "Distributive shock occurs due to increased systemic vascular resistance."

Correct Answer is C

Explanation

A. "Distributive shock occurs due to loss of myocardial contractility": This statement is incorrect. Distributive shock is not primarily caused by loss of myocardial contractility. Instead, distributive shock is characterized by widespread vasodilation, which leads to inadequate tissue perfusion despite normal or high cardiac output.

B. "Distributive shock occurs due to loss of blood volume": This statement is inaccurate. Distributive shock is not primarily caused by loss of blood volume. While hypovolemia (loss of blood volume) can lead to shock, distributive shock specifically involves excessive vasodilation, resulting in a relative hypovolemia due to pooling of blood in the expanded vascular bed.

C. "Distributive shock occurs due to systemic vasodilation": This statement is correct. Distributive shock, also known as vasodilatory shock, occurs due to widespread vasodilation of the systemic vasculature. This vasodilation leads to a decrease in systemic vascular resistance, which results in the redistribution of blood flow away from vital organs and tissues, leading to inadequate tissue perfusion and shock.

D. "Distributive shock occurs due to increased systemic vascular resistance": This statement is incorrect. Distributive shock is characterized by decreased systemic vascular resistance due to vasodilation, not increased systemic vascular resistance. Increased systemic vascular resistance is more commonly associated with conditions such as hypertension or obstructive shock.

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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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