title: [Changes in the sinus beat following extrasystole as evidenced by the Holter ECG].
abstract: In order to establish the nature and extent of alterations of a sinus beat following a ventricular extrasystole (VES), all two-channel Holter ECGs from 1984-86 were analyzed retrospectively. All passages suspicious for T wave alterations in the miniaturized ECG were written with 25 mm/sec paper speed and the sinus beats before and after a VES were compared (without interposed VES and ventricular tachycardia). In 57 men and 43 women, 100 ECGs were found with monomorphic (25%) or polymorphic (75%) VES. On the basis of clinical, noninvasive diagnostic procedures, 65 patients had cardiovascular disease. In 42 patients from all those investigated, alterations of the T wave of the postextrasystolic sinus beat were seen. These took the form of flattening in 62%, a rise in 26% and inversion of the T wave in 12% (chiefly on channel 2). While the ST segment and the U wave were always unaltered, a shortening of PQ was observed in 40%. These alterations in the T wave and the PQ time do not allow a distinction between persons with and without cardiovascular disease.
mesh_terms: D000328:Adult; D000368:Aged; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012849:Sinoatrial Node / Q000503:physiopathology*
vernacular_title: Veränderungen des postextrasystolischen Sinusschlags im Holter-EKG.