Postextrasystolic T wave changes in normal canine hearts.
Premature ventricular beats were induced at variable coupling intervals and postextrasystolic T wave changes were observed following various postextrasystolic cycle lengths in 19 closed chest dogs with normal hearts. Following relatively longer postextrasystolic cycle lengths, reversal of the T wave polarity was seen in six dogs (31%), only T wave amplitude changes were seen in 6 dogs (31%), and no significant T wave changes were seen in seven dogs (38%). It was concluded that postextrasystolic T wave changes occur in normal hearts and have no useful diagnostic values.
D000818:Animals; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial; D004285:Dogs; D004562:Electrocardiography; D013997:Time Factors