Electrocardiographic changes in dermatomyositis and polymyositis.

Area of Science:

• Cardiology
• Rheumatology
• Medical Diagnostics

Background:

• Cardiac involvement is common in inflammatory myopathies.
• Electrocardiogram (ECG) is vital for detecting cardiac issues in these patients.

Purpose of the Study:

• To analyze and compare ECG findings in dermatomyositis (DM) and polymyositis (PM) patients against a control group.
• To identify specific ECG abnormalities associated with DM and PM.

Main Methods:

• A cross-sectional study comparing ECGs of 112 inflammatory myopathy patients (78 DM, 34 PM) with 86 controls.
• Analysis included demographic data, comorbidities, and ECG findings, with comparisons between DM and PM groups.

Main Results:

• Patients showed a higher frequency of left ventricular hypertrophy (LVH) compared to controls (10.7% vs. 1.2%).
• ECG abnormalities were more prevalent in polymyositis (PM) patients (50%) than in dermatomyositis (DM) patients (24.4%).
• Specific abnormalities like LVH, left atrial enlargement, and conduction blocks were more frequent in PM than DM.

Conclusions:

• Distinct ECG patterns differentiate DM and PM.
• Increased LVH frequency in myositis patients warrants cardiac monitoring.
• Cardiac evaluation is recommended for all myositis patients, particularly those with PM, even if asymptomatic.