The nurse obtains a 6 second EKG strip on a patient. The nurse interprets this strip as what rhythm?

Choice A rationale Ectopic beats originating from an irritable focus in the ventricles characterize this rhythm. The EKG strip shows a premature, wide, and distorted QRS complex occurring earlier than expected. This occurs because the electrical impulse skips the normal conduction pathway, leading to slower myocardial cell-to-cell depolarization. Since the ventricles do not fill adequately before contracting, the stroke volume is reduced. Frequent occurrences can signify myocardial irritability or electrolyte imbalances like hypokalemia or hypomagnesemia. Choice B rationale This rhythm is identified by three or more consecutive premature ventricular contractions occurring at a rate exceeding 100 beats per minute. The QRS complexes are wide and uniform, typically masking the P waves entirely. It is a life-threatening arrhythmia because the rapid rate significantly reduces diastolic filling time, leading to a precipitous drop in cardiac output and blood pressure. It may lead to cardiac arrest if not treated promptly with amiodarone, lidocaine, or cardioversion. Choice C rationale Characterized by a chaotic, disorganized electrical activity without any identifiable P waves, QRS complexes, or T waves, this rhythm represents a pulseless state. The ventricles merely quiver rather than contracting, resulting in zero cardiac output. This is a medical emergency requiring immediate defibrillation and high-quality CPR. The lack of coordinated depolarization means the heart cannot pump blood to the brain or vital organs, leading to biological death within minutes if left untreated. Choice D rationale This rhythm involves an early electrical impulse originating from an ectopic focus in the atria rather than the SA node. On an EKG, the P wave of the premature beat may have a different shape or be hidden in the preceding T wave. The QRS complex usually remains narrow because the impulse travels through the normal ventricular conduction system. While often benign, frequent occurrences can be a precursor to atrial fibrillation or supraventricular tachycardia.