A nurse entering a patient's room assesses the patient to be non-responsive. The cardiac rhythm looks to be normal sinus rhythm but the nurse does not feel a pulse. What is the correct term for this rhythm?

Choice A rationale Ventricular tachycardia is characterized by a rapid, wide QRS complex rhythm originating from the ventricles. While it can occur without a pulse, the prompt describes a normal sinus rhythm on the monitor. Ventricular tachycardia would show a distinct lack of P waves and a heart rate typically above 100 beats per minute. Because the monitor shows a normal pattern but the patient is unresponsive with no pulse, this diagnosis is scientifically incorrect. Choice B rationale Pulseless electrical activity occurs when the heart's electrical conduction system functions in a relatively normal organized fashion, but the myocardium fails to produce a mechanical contraction or sufficient stroke volume to generate a palpable pulse. This results in an organized rhythm like sinus rhythm on the ECG monitor despite the clinical state of cardiac arrest. It requires immediate CPR and identification of reversible causes such as hypovolemia, hypoxia, or electrolytes imbalances to restore mechanical function. Choice C rationale Sudden cardiac death is a broad clinical term used to describe an unexpected natural death due to cardiac causes, usually within one hour of symptom onset. While the patient in the scenario is in cardiac arrest, the term does not describe the specific cardiac rhythm observed on the monitor. It is a clinical outcome rather than a rhythmic classification. The nurse must identify the specific rhythm to guide the advanced cardiovascular life support interventions required. Choice D rationale Premature ventricular contractions are single ectopic beats that interrupt the regular underlying rhythm and are usually followed by a compensatory pause. They do not typically cause a complete loss of pulse or unresponsiveness unless they occur so frequently that they transition into a more lethal arrhythmia. A rhythm that looks like normal sinus rhythm but lacks a pulse is a systemic failure of mechanical output, not a minor electrical irritability issue like PVCs.