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Related Experiment Videos

Induced concealed dissimilar atrial rhythms.

P Rakovec, M Horvat, J Jakopin

Pacing and Clinical Electrophysiology : PACE

|July 1, 1982

Summary

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Sick sinus syndrome patients experienced inducible concealed atrial flutter, undetectable by surface ECG. Atrial changes may predispose individuals to these arrhythmias.

Area of Science:

Cardiology
Electrophysiology
Cardiac Arrhythmias

Background:

Sick sinus syndrome (SSS) is a complex cardiac condition affecting the heart's natural pacemaker.
Electrophysiologic studies are crucial for diagnosing and understanding arrhythmias in SSS.

Observation:

Two patients with suspected SSS underwent electrophysiologic testing with intra-atrial recordings and atrial stimulation.
Premature atrial stimuli triggered concealed atrial flutter, visible only on intracavitary electrograms, not surface ECGs.

Findings:

Inducible concealed atrial flutter was observed in both patients.
One patient exhibited simultaneous atrial fibrillation in a portion of the right atrium.
Surface ECG showed a shift to upper nodal rhythm, while atrial electrograms indicated continuous A waves.

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Implications:

Atrial changes associated with SSS may serve as a predisposing factor for concealed atrial arrhythmias.
These findings highlight the importance of intracavitary recordings for detecting subtle arrhythmias in SSS.
Understanding these mechanisms can inform targeted therapeutic strategies for SSS patients.