Welch Allyn Cardioperfect Workstation, PEDMEANS ECG Interpretation Module - Physicians - User Manual - Manual (Page 40)

CardioPerfect Workstation
PEDMEANS ECG Interpretation Module Physicians Manual
DIR 80015051 Rev. C 40 / 55
3.14 Group 11: Irregular rhythms with 0.15 < P/QRS

0.9 and PR range > 30
ms
If the number of P waves is small, no further specification of the atrial rhythm is given. Otherwise, it is
tested whether there exists a second degree AV block of the Wenckebach type. Three conditions
should be met for this test to pass: (1) the maximal RR interval should exceed the minimal RR interval
by at least 40%, (2) the RR interval preceding the longest RR interval should be shorter than the one
following the longest RR interval, and (3) the shortest PR interval should be found in the longest RR
interval. If this test fails, a distinction is to be made between AV dissociation and sinus rhythm with
ectopic complexes of supraventricular origin.
Say: “undetermined atrial rhythm with block and/or interference in the AV junction”
“consider atrial fibrillation”
if: P/QRS ratio < 0.3
Say:
“sinus rhythm with second degree AV block, type I (Wenckebach)”
if: P/QRS ratio

0.3
and test Wenckebach passed
Say:
“undetermined atrial rhythm with block and/or interference in the AV junction”
if: PR range > 120 ms
Say:
“supraventricular escapes, cause? eg AV block, SA block?”
if: 60 < PR range

120 ms
and heart rate < LLN – 10 BPM
Say:
“consider supraventricular escapes, cause? eg AV block, SA block?”
if: 30 < PR range

60 ms
and heart rate < LLN – 10 BPM
Say:
“premature atrial complexes”
if: 60 < PR range

120 ms
and heart rate

LLN – 10 BPM
Say:
“consider premature atrial complexes”
if: 30 < PR range

60 ms
and heart rate

LLN – 10 BPM
Say:
“sinus bradycardia”
if: heart rate < LLN – 10 BPM
Say:
“sinus rhythm”
if: LLN – 10 BPM 
heart rate < ULN
Say:
“sinus tachycardia”
if: heart rate

ULN