Serial electrocardiographic findings in acute myocarditis

Area of Science:

• Cardiology
• Internal Medicine

Background:

• Acute myocarditis is an inflammatory condition of the heart muscle.
• Electrocardiogram (ECG) plays a crucial role in diagnosing cardiac conditions.
• Differentiating myocarditis from acute myocardial infarction (AMI) is clinically important.

Purpose of the Study:

• To elucidate characteristic electrocardiogram (ECG) findings in patients with acute myocarditis.
• To identify ECG patterns that aid in distinguishing acute myocarditis from AMI.

Main Methods:

• Retrospective analysis of ECG data from 11 patients diagnosed with acute myocarditis.
• Comparison of ECG findings during the acute stage, pre-illness, and convalescent stages.
• Correlation analysis between ECG parameters and left ventricular (LV) ejection fraction.

Main Results:

• Conspicuous finding: ST elevation without reciprocal ST depression in the acute stage.
• Significant decrease in total QRS amplitudes during the acute phase compared to other stages.
• Abnormal Q waves observed in 7 patients, often transient.
• Inverse correlation found between Q waves and LV ejection fraction (r = -0.87, p < 0.01).
• Conduction disturbances (AV block, bundle branch block) present in 7 patients; AV block transient, bundle branch block persistent.
• Corticosteroid treatment showed efficacy in patients with myocardial edema and AV conduction issues.

Conclusions:

• Serial ECG findings in acute myocarditis are highly characteristic.
• Characteristic ECG patterns can effectively differentiate acute myocarditis from acute myocardial infarction (AMI).
• Understanding these ECG nuances is vital for accurate diagnosis and management of acute myocarditis.