A nurse is teaching a client who has a new diagnosis of atrial fibrillation. The nurse should instruct the client to monitor for which of the following complications?

Choice A rationale Sinus bradycardia involves a heart rate below 60 beats per minute, which is typically contrary to the presentation of atrial fibrillation. In atrial fibrillation, the multiple rapid impulses from the atria usually lead to a rapid ventricular response, causing tachycardia rather than bradycardia. While medications like beta blockers or calcium channel blockers can cause slow rates, the primary pathological complication of the arrhythmia itself is not bradycardia but rather hemodynamic instability or thromboembolic events. Choice B rationale Peripheral vascular disease is a chronic condition characterized by the narrowing of arteries outside the heart and brain, often due to atherosclerosis. While both atrial fibrillation and peripheral vascular disease share common risk factors like hypertension or age, atrial fibrillation does not directly cause peripheral vascular disease. The concern in atrial fibrillation is the formation of acute arterial emboli that can travel to the limbs, causing acute ischemia, which is distinct from the chronic progression of systemic atherosclerosis. Choice C rationale Atrial fibrillation causes ineffective atrial contraction, leading to blood stasis within the atria, especially the left atrial appendage. This stasis facilitates the formation of thrombi. If a clot forms in the right atrium and dislodges, it travels through the right ventricle into the pulmonary circulation, resulting in a pulmonary embolism. Conversely, left-sided clots lead to systemic strokes. Monitoring for sudden shortness of breath or chest pain is essential due to this high thromboembolic risk. Choice D rationale Hypertension is frequently a precursor or a comorbid condition that contributes to the development of atrial fibrillation by causing structural remodeling of the heart. However, atrial fibrillation itself does not cause hypertension. In many cases, the loss of atrial kick and rapid heart rate associated with atrial fibrillation can actually lead to a decrease in cardiac output, which might manifest as hypotension or a drop in blood pressure rather than an elevation in pressure.