Abstract
Cardiac rearrest after successful return of spontaneous circulation (ROSC) is a significant barrier to successful resuscitation, making it a high priority for emergency care research. Rearrest is commonly due to ventricular tachycardia/fibrillation (VT/VF) or pulseless electrical activity (PEA), each with different, yet poorly understood mechanisms. In general, heart rate variability (HRV) has been associated with long-term risk of primary VT/VF, related to altered autonomic tone; however, its association with rearrest due to VT/VF or PEA after ROSC is not clear.
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