User`s guide

How the PageWriter 200/300pi Measures ECGs

PageWriter 200/300pi M1771A/1770A Cardiograph 3-5

these measurements is created, from which the representative measurements

are calculated.

Group Measurements

After all the beats have been measured, each beat in the ECG is classified into

one of five rhythm groups based on rate and morphology parameters. Each

group consists of beats with similar R-R intervals, durations, and shapes,

except that all paced beats are grouped together, regardless of other parame-

ters. Group 1 represents the type of beat that is most normal or predominant

and groups 2 through 5 represent other beat types. The group into which each

beat is classified is noted under the heading “Rhythm Grouping of Beats” on

the Extended Measurements report. Group measurements are calculated by

averaging the measurements for all the beats in each of the groups and are

reported in the Rhythm Analysis section of the Extended Measurements

report.

Lead Measurements

Representative measurements for each of the 12 leads are calculated from the

comprehensive set of measurements for all the beats in the ECG. Only the

beats of the predominant group (Group 1) are used. If a particular lead (as

shown on the Auto 3 x 4 report) does not have any Group 1 beats, a beat group

with similar parameters is used, if possible. The measurement program tries to

select a beat group for which the beats are not paced. Only if all beats in the

ECG are paced will the measurements be for paced beats. If there are paced

and non-paced beats in an ECG, only the non-paced beats will be measured,

which may result in leads for which no measurements are reported.

In each lead, the measurements for all the beats belonging to the selected beat

group are averaged. The lead measurements are representative of the domi-

nant waveform present in each lead and are reported in the Morphology Anal-

ysis section of the Extended Measurements report.

Atrial Rhythm Analysis

Atrial rhythm is determined by examining leads V1, aVF, II and III in succes-

sion until the program can report conclusively that there are multiple P waves,

that there are no P waves, or that there is one P wave per QRS complex. If a

conclusive result is achieved, then the last lead analyzed will be used to calcu-