Noxious arousal induces T-wave changes in healthy subjects

Area of Science:

• Cardiology
• Electrophysiology
• Autonomic Nervous System

Background:

• Sudden arousal is linked to cardiac events in patients with heart conditions.
• Understanding arousal's impact on ventricular repolarization is crucial.

Purpose of the Study:

• To investigate the effects of various arousal scenarios on ventricular repolarization in healthy individuals.
• To examine dynamic QT interval-heart rate relationship and T-wave morphology changes during arousal.

Main Methods:

• Eighteen healthy subjects underwent 24-hour Holter monitoring.
• Five distinct arousal events were simulated: natural waking, morning/night alarms, and postural changes.
• QT/RR relationship and T-wave morphology were analyzed dynamically.

Main Results:

• No significant changes in the overall QT/RR relationship were observed within 20 minutes post-arousal.
• Marked T-wave morphology changes, including inversion, occurred during all arousal events.
• Postural changes minimally contributed to T-wave morphology alterations.

Conclusions:

• Noxious arousal induces significant T-wave morphology changes in healthy individuals.
• These T-wave changes suggest potential abnormal repolarization adaptation to rapid heart rate and autonomic shifts.
• The findings highlight arousal's impact on cardiac electrophysiology even in healthy subjects.