Ventricular ectopic beats with fixed and variable coupling

Surawicz, Borys; MacDonald, Murdo G.

doi:10.1016/0002-9149(64)90174-2

Cited by 30 publications

(2 citation statements)

References 19 publications

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“…There are no comparable data on the frequency of this form of ectopic activity, although it has been described by Surawicz and Macdonald [1964], The association of cardiac disease with this form of ventricular ectopic activity has not been examined before. Digoxin administration is uncommon in patients with variable coupling and this may explain the lower percentage of patients on digoxin in the variable coupling group.…”

Section: Discussionmentioning

confidence: 99%

“…Digoxin administra tion does not seem to produce any particular form of ventricular ectopic activity, and the type that occurs is mainly dependent on the cardiac state of the patient. Surawicz and Macdonald [1964] described a 'clear zone' in variable coupling, ectopics clustering close to the T wave and at the end of electrical diastole. This was not confirmed possibly because of the stringent criteria used to exclude aberrant conduction.…”

Section: Discussionmentioning

confidence: 99%

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Fixed and Variable Coupling of Ventricular Extrasystoles

Talbot¹

1973

Cardiology

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It is often difficult to distinguish between coupled extrasystoles and parasystole, since there are many cases with variable but non-parasystolic extrasystoles. Extrasystoles with variable coupling and parasystolic ectopic beats are usually associated with electrocardiographic signs of cardiac disease, and are uncommon in normal subjects. The QT segment appears to be unaltered in patients with extrasystoles. In variable and fixed coupling, the ectopic beats tend to occur just after the T wave, possibly because of a supernormal phase of response to an ectopic focus. Digoxin is associated with both variable and fixed coupling of extrasystoles.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%