Atrial flutter. Electrocardiographic, vectorcardiographic and echocardiographic correlation.

Area of Science:

• Cardiology
• Electrophysiology
• Medical Imaging

Background:

• Atrial flutter wave characteristics are crucial for understanding atrial electrical activity.
• Left atrial size is a known factor influencing various cardiac arrhythmias.
• Electrocardiogram (ECG) and Vectorcardiogram (VCG) are standard tools for cardiac electrical assessment.

Purpose of the Study:

• To investigate the relationship between left atrial (LA) size and the electrocardiogram (ECG) and vectorcardiogram (VCG) parameters of atrial flutter (f) waves.
• To determine if LA size predicts specific features of the atrial flutter wave.
• To analyze conduction delays in post-conversion sinus rhythm in relation to LA size.

Main Methods:

• ECG and VCG were used to analyze atrial flutter wave duration, contour, and amplitude in 32 patients.
• Left atrial size was measured using echocardiography (E).
• Analysis included LA depolarization duration, amplitude, surface area, and maximum f wave amplitude; VCG patterns of flutter waves and post-conversion P waves were also assessed.

Main Results:

• A significant correlation was found between LA size and the duration and surface area of the LA wave (p < 0.01).
• Maximum f wave amplitude in Leads 2 and V1 did not predict LA size.
• Enlarged LA (ELA) was associated with abnormal post-conversion P wave duration and distorted VCG flutter wave loops, indicating conduction delays.

Conclusions:

• Left atrial size and conduction delays are fundamental determinants of atrial flutter wave duration and contour.
• ECG and VCG provide valuable insights into the electrophysiological consequences of left atrial enlargement.
• Understanding these relationships aids in the assessment and management of atrial arrhythmias.