A nurse is assessing a client's ECG strip and notes an irregular heart rate of 98/min with no clear P waves. Which of the following cardiac dysrhythmias should the nurse document?

Rationale: A. First-degree heart block: This rhythm shows a prolonged PR interval but maintains regular P waves before every QRS complex and a consistent rhythm. The presence of P waves and regularity rule out this option. B. Atrial fibrillation: Atrial fibrillation is characterized by an irregularly irregular rhythm and absent or indistinct P waves due to disorganized atrial electrical activity. A heart rate of 98/min with no clear P waves fits the criteria for this dysrhythmia. C. Complete heart block: Complete (third-degree) heart block features a complete dissociation between atrial and ventricular activity, with P waves and QRS complexes occurring independently. It typically presents with a bradycardic rhythm, not near 98/min. D. Ventricular tachycardia: Ventricular tachycardia presents with a rapid, regular rhythm and wide QRS complexes. It usually lacks P waves but is typically much faster than 98/min, often ranging from 140 to 200 beats/min.