A nurse reviews the client's telemetry monitor at the beginning of the shift. The monitor displays the following image in a 6-second time period. Which cardiac rhythm should the nurse document in the client's record?

Cardiac rhythm interpretation is essential for identifying abnormalities in electrical conduction. Atrial fibrillation is a common dysrhythmia characterized by chaotic atrial activity, leading to an irregularly irregular ventricular response. It results in ineffective atrial contraction and can increase the risk of thromboembolic events. Recognizing its distinct ECG features is critical for prompt and appropriate management. Rationale: A. Atrial fibrillation is identified by an irregularly irregular rhythm, absence of distinct P waves, and a fibrillatory baseline. The ventricular rate may vary, and there is no consistent pattern between R-R intervals. These hallmark findings distinguish it from other rhythms. Therefore, this is the correct answer. B. Atrial flutter typically presents with a “sawtooth” pattern of flutter waves and a more regular rhythm, often with a consistent conduction ratio (e.g., 2:1). This differs from the chaotic and irregular pattern seen in atrial fibrillation. Therefore, this is incorrect. C. Supraventricular tachycardia (SVT) is characterized by a rapid, regular rhythm with narrow QRS complexes and often absent or hidden P waves. The rhythm is typically very consistent, unlike the irregular pattern of atrial fibrillation. Therefore, this is incorrect. D. Sinus tachycardia presents with a regular rhythm, identifiable P waves before each QRS complex, and a rate greater than 100/min. It maintains normal conduction pathways, unlike atrial fibrillation. Therefore, this is incorrect.