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8.7.1 Understanding the Arrhythmia Events
Basic algorithm
Arrhythmia message Description
Asystole No QRS complex for 4 consecutive seconds (in absence of ventricular
fibrillation or chaotic signals).
Vfib/Vtac A fibrillatory wave for 4 consecutive seconds. A dominant rhythm of
adjacent Vs and a HR > the V-Tach Heart Rate Limit.
PNP No pace pulse detected for 1.75 x average R-to-R intervals following a
QRS complex (for paced patients only).
PNC No QRS complex detected for 300 milliseconds following a pace pulse
(for paced patients only).
PVC One PVC detected in normal heartbeats.
Couplet Paired PVCs detected in normal heartbeats.
VT>2 More than 2 consecutive PVCs within the last minute.
Bigeminy A dominant rhythm of N, V, N, V, N, V.
Trigeminy A dominant rhythm of N, N, V,N, N, V, N, N, V.
R on T R on T detected in normal heartbeats.
Missed Beats No beat detected for 1.75 x average R-R interval for HR <120, or No
beat for 1 second with HR >120 (for non-paced patients only), or No
beat detected for more than the set pause threshold.
Brady The average heart rate is less than 60 bpm.
Tachy The average heart rate is greater than 100 bpm.
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