Author + information
- Received March 10, 1986
- Revision received January 27, 1987
- Accepted February 6, 1987
- Published online August 1, 1987.
- ↵†Address for reprints: L. Thomas Sheffield, MD, Department of Medicine, University Station, Birmingham, Alabama 35294.
The three principal forms of medical electrocardiography are the standard 12 lead electrocardiogram (ECG), the exercise ECG and the long-term ambulatory ECG. The volume of use of the 12 lead ECG is 10 to 20 times greater than that of the exercise test or the ambulatory test, and it has received correspondingly more developmental and marketing attention. A great increase in the rate of adoption of computerized electrocardiography was brought about when large scale integration of computer hardware made it possible to place the entire computational package within a standard-sized ECG cart.
Exercise ECG testing involves processing a data sampie minutes in duration. Only a very few diagnostic possibilities are examined; emphasis is on measurements of the ST segment arid on non-ECG observations.
Ambulatory electrocardiography currently involves only one or two ECG leads and these are tested for only a few diagnostic possibilities; however, duration of the data sample is relatively long, usually 24 hours. Computer processing involves examination of about 100,000 cardiac cycles for RR interval, QRS shape and ST segment deviation.
↵1 From the University of Alabama at Birmingham, Birmingham, Alabama.
* Parts I to VI of this Seminar appeared in the October and November 1986 and January, March, April and June 1987 issues of the Journal.
- Received March 10, 1986.
- Revision received January 27, 1987.
- Accepted February 6, 1987.
- American College of Cardiology Foundation