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Electrocardiocorder—AVSEP Patterns as Seen in Angina Pectoris.

J. S. Gilson, M.D., F.A.C.P.
Ann Intern Med. 1963;58(4):716. doi:10.7326/0003-4819-58-4-716_3
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In the course of clinical trials using the Electrocardiocorder, (AVSEP)® analysis devices developed at the Holter Research Foundation Laboratory in Helena, Montana, we have accumulated 40 recording periods of 5 hours each on 30 patients having, or seriously suspected of having angina pectoris. The Electrocardiocorder records electrocardiographic potentials on slowly moving tape; AVSEP rapidly superimposes each successive PQRST pattern as projected on an oscilloscopic screen so that changing PQRST patterns form a "fast-motion" movie.

We have identified clear examples of subclinical angina by observing anginal AVSEP patterns in patients with and without pain, under separate, but similar circumstances. We have


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