An off-line digital system for reproducible interpretation of the exercise ECG

Dennis G. Caralis, Garth Wiens, Leslee Shaw, Liwa T. Younis, Mary Ellen Haueisen, Robert D. Wiens, Bernard R. Chaitman

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Exercise electrocardiograms of 20 patients were analyzed using a customized software exercise electrocardiographic program and compared to measurements made by two cardiologists performing independent interpretations. The computerized program requires identification of the PQ junction, J point, and tracing of the ST-segment in three consecutive beats. The proportion of variance for J point, and ST 80 measurements was 0.93 and 0.90, respectively, when the same electrocardiogram was processed twice and analyzed by two separate cardiologists. The same 20 exercise electrocardiograms were analyzed by two other experienced cardiologists without computerized measurements. The proportion of variance was less at 0.73 and 0.76 for the J point and ST 80 measurements, respectively. The average amount of time required for the cardiologist to over read the computerized measurements was 2.7 ± 1.5 minutes per ECG as compared to 20.7 ± 11 minutes for the cardiologists who did not have computer-assisted measurements (p < 0.0001). Thus, off-line computerized exercise electrocardiographic interpretation is highly reproducible, accurate, time-sparing for cardiologist over read function, and suitable for use in large-scale clinical trials.

Original languageEnglish
Pages (from-to)285-291
Number of pages7
JournalJournal of Electrocardiology
Issue number4
StatePublished - Oct 1990
Externally publishedYes


  • computer analysis
  • exercise electrocardiogram
  • observer variability


Dive into the research topics of 'An off-line digital system for reproducible interpretation of the exercise ECG'. Together they form a unique fingerprint.

Cite this