Multifocal atrial tachycardia

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Multifocal atrial tachycardia
ECG showing multifocal atrial tachycardia
Synonyms Chaotic atrial tachycardia
Pronounce N/A
Specialty N/A
Symptoms Palpitations, shortness of breath, chest pain, dizziness
Complications Heart failure, stroke
Onset More common in older adults
Duration Can be transient or persistent
Types N/A
Causes Chronic obstructive pulmonary disease, electrolyte imbalance, heart failure, infection
Risks Chronic lung disease, coronary artery disease, diabetes mellitus
Diagnosis Electrocardiogram (ECG)
Differential diagnosis Atrial fibrillation, atrial flutter, sinus tachycardia
Prevention N/A
Treatment Treat underlying cause, rate control, antiarrhythmic drugs
Medication Calcium channel blockers, beta blockers
Prognosis Varies depending on underlying condition
Frequency Rare
Deaths N/A


Multifocal atrial tachycardia

Multifocal atrial tachycardia (MAT) is a type of tachycardia characterized by multiple P wave morphologies and irregular P-P intervals. It is often associated with severe underlying medical conditions, particularly lung disease and cardiac disease.

Epidemiology[edit | edit source]

MAT is most commonly seen in elderly patients with severe pulmonary disease. It is also associated with coronary artery disease, diabetes, sepsis, and following surgery.

Pathophysiology[edit | edit source]

The exact mechanism of MAT is not well understood. It is thought to be due to enhanced automaticity or triggered activity in multiple atrial foci. The irregular rhythm is due to the random discharge of these multiple foci.

Clinical Features[edit | edit source]

Patients with MAT may present with palpitations, dyspnea, or syncope. However, many patients are asymptomatic and MAT is discovered incidentally on electrocardiogram (ECG).

Diagnosis[edit | edit source]

The diagnosis of MAT is made on ECG. The characteristic findings include an irregularly irregular rhythm, heart rate >100 beats per minute, and at least three different P wave morphologies.

Treatment[edit | edit source]

The treatment of MAT is primarily directed at the underlying condition. In some cases, rate control with calcium channel blockers or beta blockers may be necessary.

Prognosis[edit | edit source]

The prognosis of MAT is generally poor, due to the severity of the underlying conditions. However, with appropriate treatment of the underlying condition, the prognosis can be improved.

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Contributors: Prab R. Tumpati, MD