What does ES stand for?

MLA style: "ES." Acronym Finder . 2012. AcronymFinder.com 29 May. 2012 http://www.acronymfinder.com/Extra-Systole-(pacemaker)-(ES).html
Chicago style: Acronym Finder . S.v. "ES." Retrieved May 29 2012 from http://www.acronymfinder.com/Extra-Systole-(pacemaker)-(ES).html
APA style: ES. (n.d.) Acronym Finder. (2012). Retrieved May 29 2012 from http://www.acronymfinder.com/Extra-Systole-(pacemaker)-(ES).html

Extra Systole (pacemaker)

This definition appears very rarely and is found in the following Acronym Finder categories:

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Samples in periodicals archive:

They found something in the electro-cardiogram, various extra systoles.

It was the first episode and about the past she did not remember any other episode of prolonged extra systoles or tachycardia.