Which of the following dysrhythmias is an example of a narrow QRS complex tachycardia?
Third degree atrioventricular block
Ventricular tachycardia
Ventricular fibrillation
Supraventricular tachycardia
The Correct Answer is D
A. Third-degree AV block is a bradyarrhythmia and typically has a wide QRS due to ventricular escape rhythm.
B. Ventricular tachycardia originates in the ventricles, producing a wide QRS complex.
C. Ventricular fibrillation is characterized by chaotic ventricular activity with no discernible QRS complexes.
D. Supraventricular tachycardia originates above the ventricles (atria or AV node) and produces a narrow QRS complex, making it the classic example of narrow complex tachycardia.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Pulmonary Vascular Resistance (PVR) reflects the afterload of the right ventricle, not the left ventricle.
B. Central Venous Pressure (CVP) indicates right atrial pressure and preload, not afterload.
C. Pulmonary Capillary Wedge Pressure (PCWP) reflects left ventricular preload, not afterload.
D. Systemic Vascular Resistance (SVR) represents the resistance the left ventricle must overcome to eject blood into the systemic circulation, making it the primary measure of left ventricular afterload.
Correct Answer is B
Explanation
A. Dopamine can increase cardiac output and BP but may worsen hypovolemia if the patient is volume-depleted.
B. Low CVP and PAP indicate hypovolemia; fluid replacement is the priority to restore preload, improve cardiac output, and stabilize blood pressure.
C. Nitroprusside sodium is a vasodilator and would further lower BP, which is contraindicated in this hypotensive, hypovolemic patient.
D. Furosemide is a diuretic and would worsen hypotension and low preload; it is not appropriate in this situation.
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