8-17
Mortara algorithm
Arrhythmia message Description
Asystole No QRS complex for 4 consecutive seconds (in absence of ventricular
fibrillation or chaotic signals).
Vfib Ventricular fibrillation occurs and persists for 6 seconds.
Vtac Ventricular HR is greater or equal to the preset threshold and the
number of consecutive PVCs is greater than the preset threshold.
PNP No pace pulse detected for (60*1000/pace rate +90) milliseconds
following a QRS complex or a pacer pulse (for paced patients only).
PNC No QRS complex detected for 300 milliseconds following a pace pulse
(for paced patients only).
Multif. PVC More than 2 PVCs of different forms occur in the predefined search
window (3-31).
Couplet Paired PVCs detected in normal heartbeats.
VT>2 Ventricular HR is greater than or equal to the preset threshold and the
number of PVCs is greater than or equal to 3 but less than the preset
threshold.
Vent. Rhythm Ventricular HR is less than the preset threshold and the number of
PVCs is greater than or equal to 3.
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 is detected.
Irr. Rhythm Consistently irregular rhythm
Missed Beats No beat detected for 1.75x 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 HR is less than the set bradycardia low limit.
Tachy The HR is greater than the set tachycardia high limit.
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