Multifocal Atrial Tachycardia Diagnosis and Management

Clinical Context and Diagnosis

Simple sinus tachycardia remains possible, though the description of "abnormal rhythm" suggests otherwise, with the American College of Cardiology recommending distinction from multifocal atrial tachycardia based on gradual acceleration/deceleration and normal P-wave morphology 1
Sinus tachycardia shows gradual acceleration/deceleration and normal P-wave morphology, while multifocal atrial tachycardia shows abrupt rate changes and varying P-wave morphology, according to the American Heart Association 2

Evaluate for respiratory failure requiring noninvasive positive pressure ventilation (NPPV) if pH <7.35 with hypercapnia, as recommended by the European Respiratory Society 3
Heart rates <150 bpm are unlikely to cause hemodynamic instability unless ventricular dysfunction is present, so aggressive rate control is not indicated, with the American College of Cardiology suggesting a more conservative approach 4, 1

The most important pitfall is attempting to "normalize" the heart rate to <100 bpm without addressing the underlying COPD exacerbation and hypoxemia, which can be detrimental in patients with poor cardiac function or severe respiratory compromise, as warned by the American Thoracic Society 4, 1