8-18
Arrhythmia message Description Category
Tachy The average heart rate is equal to or greater than the tachycardia limit.
Vent. Rhythm
The consecutive PVCs ≥ the Vbrd PVCs limit, and the HR ≥ Vbrd Rate
limit but < the Vtac Rate limit.
Multif. PVC Multiform PVCs detected in Multif. PVC's Window (which is adjustable).
Nonsus. Vtac
The consecutive PVCs < the Vtac PVCs limit but > 2, and HR ≥ the Vtac
Rate limit.
Pause No QRS detected within the set time threshold of pause.
Irr. Rhythm Consistently irregular rhythm.
Afib P wave is absent and normal beat RR intervals are irregular.
Mortara algorithm
Arrhythmia Message Description Category
Asystole
No QRS complex detected within the set time threshold (in absence of
ventricular fibrillation or chaotic signals).
Lethal
arrhythmia
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.
PVCs PVCs/min exceeds high limit
Nonlethal
arrhythmia
Pacer not paced
No pace pulse detected for (60*1000/pace rate +90) milliseconds
following a QRS complex or a pacer pulse (for paced patients only).
Pacer not capture
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 are detected.
Run PVCs
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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