Welch Allyn Cardioperfect Workstation, PEDMEANS ECG Interpretation Module - Physicians - User Manual - Manual (Page 42)

CardioPerfect Workstation
PEDMEANS ECG Interpretation Module Physicians Manual
DIR 80015051 Rev. C 42 / 55
3.16 Group 13: Irregular rhythms with P/QRS > 1.2 and PR range > 30 ms
Say: “supraventricular (sinus?) tachycardia with second degree AV block at”
“ variable conduction ratio”
if: 270

shortest PP interval < LLN
Say:
“sinus rhythm with second degree AV block at variable conduction ratio”
if: shortest PP interval

LLN
3.17 Group 14: Irregular rhythms with P/QRS > 1.0 and PR range

30 ms
The irregularity of the ventricular rhythm combined with the constancy of the PR interval and a higher
number of P waves than QRS complexes implies that either a second degree AV block with constant
preceding conduction times (Mobitz type II) or advanced AV block with varying conduction ratios is
present. In case of Mobitz type II AV block, the longer RR intervals will most likely be sandwiched
between shorter RR intervals. This is unlikely to occur in cases with advanced AV block with varying
conduction ratios.
Say: “atrial flutter”
if: shortest PP interval < 270 ms
Say:
“atrial tachycardia”
if: 270

shortest PP interval < 370 ms
Say:
“sinus tachycardia”
if: 370

shortest PP interval < LLN
Say:
“sinus rhythm”
if: shortest PP interval

LLN
Say:
“with second degree AV block, type II (Mobitz II)”
if: varying RR intervals fulfilling Mobitz II criteria
Say:
“with second degree AV block at variable conduction ratio”
if: RR intervals not fulfilling Mobitz II criteria