In your EKG interpretation class, the nursing educator is discussing an adult patient who has abnormal ventricular depolarization.
Which component of the EKG rhythm strip would you expect to see an abnormality?

Choice A rationale

Synchronized cardioversion delivers a low-energy electrical shock timed to the QRS complex to interrupt a rapid, organized rhythm like atrial fibrillation or ventricular tachycardia with a pulse. It is contraindicated in ventricular fibrillation (VF) because VF is a chaotic, unsynchronized rhythm, and mistimed delivery can worsen the rhythm.

Choice B rationale

Ventricular fibrillation (VF) is a lethal cardiac rhythm characterized by chaotic, uncoordinated electrical activity, resulting in no mechanical pump function and immediate cardiac arrest. The definitive and most critical intervention to terminate VF and restore a perfusing rhythm is immediate, high-energy, unsynchronized electrical shock, known as rapid defibrillation.

Choice C rationale

While placing the patient on oxygen (normal range 95-100% saturation) is a general supportive measure in cardiac arrest, it is not the primary intervention for a patient in ventricular fibrillation (VF). The immediate priority is defibrillation to restart the heart, as oxygenation without circulation is ineffective.

Choice D rationale

The Advanced Cardiac Life Support (ACLS) protocol for pulseless cardiac arrest prioritizes high-quality chest compressions and early defibrillation for shockable rhythms like ventricular fibrillation (VF). Rescue breaths are part of the C-A-B sequence (Circulations, Airway, Breathing) but are secondary to defibrillation in VF and should not delay the shock.

Choice A rationale

Pulmonary crackles result from fluid accumulation in the alveoli, primarily associated with left-sided heart failure or mitral valve issues, where blood backs up from the left ventricle into the lungs. Tricuspid regurgitation (TR) affects the right side of the heart, causing systemic venous congestion rather than pulmonary edema.

Choice B rationale

Tricuspid regurgitation is the incomplete closure of the tricuspid valve, leading to a backflow of blood from the right ventricle into the right atrium during systole. This increases right atrial pressure and consequently the systemic venous pressure, which is clinically manifested as visible jugular venous distention (JVD) in the neck.

Choice C rationale

A left parasternal heave is an outward thrust palpable along the left sternal border, typically caused by right ventricular hypertrophy or dilation due to conditions like severe pulmonary hypertension. While TR can cause right ventricular dilation, the heave is a structural finding, whereas JVD is a direct sign of the acute volume backflow.

Choice D rationale

Absent peripheral pulses indicate severe peripheral vascular disease or critical limb ischemia, conditions unrelated to the primary pathophysiology of tricuspid regurgitation. While severe right heart failure can cause low cardiac output, it does not characteristically lead to absent peripheral pulses; dependent edema is more common. —.