Repolarisation abnormalities and outcomes among patients with cardiac arrest

Area of Science:

• Cardiology
• Critical Care Medicine
• Electrophysiology

Background:

• Ventricular repolarization changes, specifically QTc prolongation, are common after cardiac arrest.
• The T-peak to T-end (TpTe) interval is a sensitive indicator of ventricular arrhythmia susceptibility.

Purpose of the Study:

• To investigate the association between TpTe interval prolongation and adverse clinical outcomes in patients resuscitated from cardiac arrest.
• To determine if TpTe prolongation predicts in-hospital mortality and neurological outcomes post-cardiac arrest.

Main Methods:

• A cohort of 443 adult patients who experienced cardiac arrest and achieved return of spontaneous circulation (ROSC) were analyzed.
• Electrocardiograms (ECGs) obtained within 24 hours of ROSC were used to measure QTc and TpTe intervals.
• Hierarchical logistic regression assessed the relationship between QTc/TpTe prolongation and in-hospital mortality/favorable neurologic outcome.

Main Results:

• Overall, 70.0% of patients had QTc prolongation and 64.1% had TpTe prolongation.
• TpTe prolongation was independently associated with increased in-hospital mortality (OR: 1.69, P=0.05).
• QTc prolongation was not significantly associated with in-hospital mortality or favorable neurologic outcome.

Conclusions:

• TpTe interval prolongation is a significant predictor of increased in-hospital mortality in cardiac arrest survivors.
• Unlike QTc prolongation, TpTe prolongation offers prognostic value for mortality risk after cardiac arrest.