multifocal atrial tachycardia


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Related to multifocal atrial tachycardia: atrial fibrillation, wandering atrial pacemaker

a·tri·al cha·ot·ic tach·y·car·di·a

multifocal origin of tachycardia within the atrium; often confused with atrial fibrillation during physical examination.

multifocal atrial tachycardia

Atrial tachycardia Cardiology A rapid cardiac arrhythmia caused by stimuli to the heart from multiple locations within the atria, and characterized by irregularity, variable 'P' waves and–in adults–a poor prognosis; in MAT, multiple atrial foci “fire,” leading to tachycardia, often 100 to 180 beats/min, ↑ cardiac workload, but ↓ filling time, thus ↓ cardiac function; MAT is seen in 0.05-0.32% of the EKGs interpreted in general hospitals and is more common in the acutely ill–burns, sepsis, CHF, lung cancer, respiratory failure–COPD, PTE, CAD, elderly, recent surgery, hypoxia, theophylline or digitalis overdose, DM, bacterial infections, etc Treatment Magnesium, potassium, CCBs–eg, verapamil, β-adrenergic blockers–eg, metoprolol Prognosis 43% of Pts with MAT died during the hospital stay in which the arrhythmia was documented, but death was usually related to the underlying disease

a·tri·al cha·ot·ic tach·y·car·di·a

(ā'trē-ăl kā-ot'ik tak'i-kahr'dē-ă)
Multifocal origin of tachycardia within the atrium; often confused with atrial fibrillation during physical examination.
Synonym(s): multifocal atrial tachycardia.
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