What is the classic arrhythmia commonly associated with COPD?

Multifocal atrial tachycardia is indeed the classic arrhythmia that is commonly associated with chronic obstructive pulmonary disease (COPD). This arrhythmia is characterized by the presence of multiple ectopic foci within the atria, leading to a tachycardic rhythm with varying P wave morphologies. Patients with COPD often experience hypoxia and hypercapnia, which can irritate the atrial tissues and promote the development of this rhythm.

In COPD, the underlying pathophysiology, including chronic lung inflammation and right heart strain due to pulmonary hypertension, can also contribute to the propensity for multifocal atrial tachycardia. This arrhythmia is particularly prevalent in patients with advanced COPD and can often be triggered or exacerbated by acute respiratory distress, electrolyte imbalances, or other comorbidities.

In contrast, while atrial fibrillation can also occur in patients with COPD and is a common arrhythmia in the general population, it is not as characteristic of the disease as multifocal atrial tachycardia. Other options, such as ventricular tachycardia and sinus bradycardia, are not typically associated with COPD and might suggest different underlying conditions or complications.