Interatrial mechanical dyssynchrony shown by tissue doppler imaging during atrial flutter.

Area of Science:

• Cardiology
• Medical Imaging

Background:

• Traditional diagnosis of regular supraventricular tachycardia relies on P-wave morphology from surface electrocardiography, which has diagnostic limitations.
• Intracardiac electrophysiology is a definitive diagnostic method but is invasive.

Observation:

• A case of regular supraventricular tachycardia with a heart rate of 162 bpm was analyzed.
• M-mode echocardiography of the interatrial septum was utilized to assess atrial rate and ventricular response.
• Tissue Doppler M-mode imaging was employed to visualize motion and identify delays between left and right atrial walls.

Findings:

• M-mode echocardiography successfully clarified the atrial rate and ventricular response ratio in the supraventricular tachycardia case.
• Tissue Doppler M-mode imaging revealed a delay in the posterior wall motion between the left and right atria.

Implications:

• Transthoracic echocardiography, including M-mode and Tissue Doppler, may offer supplementary diagnostic information for supraventricular tachycardia beyond standard electrocardiography.
• Further research is warranted to establish the full utility of echocardiography in diagnosing various forms of supraventricular tachycardia.