[Electrocardiographic changes in a cohort of hypertensive patients in a community intervention program]

A pilot project for the control of hypertension in the Community was carried out in Italy as a part of the WHO Programme "Community Control of Hypertension". 1190 subjects identified as hypertensive (BP greater than or equal to 160 and/or 95 mmHg at two subsequent measurements, or under treatment) during the screening of a random sample of the population between 20 and 64 years in the District of Camposampiero (Padova) were enrolled in a Hypertension Register during a subsequent visit (Registration Visit: VR) carried out two months after the screening. In the following 5 years they were recalled about once a year at a Hypertension Clinic for a complete visit (VA). On both the VR and the VAs a resting electrocardiogram (ECG) was recorded and subsequently assessed according to the Minnesota Code (MC). Out of the 1190 registered hypertensive subjects, 872 (400 males and 472 females) participated in the last VA visit after 5 years, which corresponds to an overall participation rate of 69.4% in males (M) and 76.9% in females (F). Among subjects with normal and abnormal ECG at the VR, the participation rates at the last VA were, respectively, 67.9 and 71.5% in M (not significant difference); 80.0% and 70.8% in F (significant difference: P less than 0.001). Between the VR and the last VA the mean BP values of the 872 subjects investigated decreased from 162. 9/102.2 mmHg to 148. 6/90.4 mmHg in M and from 168. 7/102.2 mmHg to 155. 3/91.7 mmHg in F. The rate of abnormal ECGs increased from 44.0% to 50.3% in M and from 36.4% to 47.9% in F, involving most single items and all the classes of the MC with the exception of classes 8 and 9. The items which diminished generally had a rather low prevalence or were those indicating minor abnormalities. The apparent regression of some pathological patterns could actually be accounted for by a shift towards more severe abnormalities. The most remarkable changes occurred in codes indicating respectively left ventricular hypertrophy (3: 1 or 3: 3) and myocardial ischaemia (4: 1-3 or 5: 1-3 or 7: 1).(ABSTRACT TRUNCATED AT 400 WORDS)