RESUMEN
R-R intervals and R-R interval variation were measured in 2 selected groups of diabetic subjects; 1 group was selected because vagal control of the heart appeared normal, the other group was selected because they lacked vagal control of the heart. The means of the R-R intervals for the 2 groups were not significantly different under various conditions (sleeping, lying, during deep breathing, sitting, standing, and during upright activity). The standard deviations of the R-R intervals for the 2 groups were only significantly different during deep breathing and upright activity. It is suggested that cardiac vagal function is not reliably assessed by measurement of R-R interval variation during quiet standing, but useful information may be obtained during deep breathing.
Asunto(s)
Diabetes Mellitus/fisiopatología , Frecuencia Cardíaca , Corazón/inervación , Nervio Vago/fisiopatología , Femenino , Humanos , Óvulo , Esfuerzo Físico , RespiraciónRESUMEN
A method is described for detecting and counting ectopic beats using a small computer. The occurrence of an ectopic beat is identified by the relative duration of adjacent pulse intervals as demonstrated by simple arithmetical procedures. The method was validated by manual counting of records from 18 patients. 89% of 1474 ectopics were correctly identified. There were few false positive identifications 42. Although the method is unsuitable for the diagnosis of arrhythmias it is likely to be of value in epidemiological studies of such disturbances.
