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This study was designed to evaluate the impact of the protocol-driven antihypertensive therapy on outcomes guided by the Joint National Committee (JNC) on Detection, Evaluation, and Treatment of high blood pressure. In a systematic hypertension control program for union employees conducted in New York City, untreated patients who began treatment on monotherapy guided by JNC recommendations during three representative periods: I-pre-JNC IV (1986-1987); II-post-JNC IV (1990-1991); and III (JNC V)-period of application of what were later published as JNC-V guidelines (1992) were observed during 1 year of treatment. A total of 550 presumably untreated patients were prescribed either diuretics, beta-blockers, calcium channel blockers, or angiotensin converting enzyme inhibitors. There were 231 in period I, 213 in II, and 106 in III. The patient composition over time became more predominantly female and Hispanic (I to III: 28% to 34%, and 35% to 45%, respectively). The main outcome measures were type of drug first prescribed and the outcomes at the end of 1 year-changes in blood pressure, clinical chemistry measures and therapy, and clinic attendance are dropout rate. The pattern of first drug prescription changed from 85% to 90% of patients given diuretics or beta-blockers in I to 90% begun on calcium channel blockers or angiotensin converting enzyme inhibitors in II and finally, to an even distribution of drugs in III. Blood pressure response was similar across the three periods, 135/89 mm Hg (I), 138/89 (II), and 140/89 (III). Proportion of patients remaining on their initial drug in each period was fairly similar (60%, 67%, and 69%). Scheduled clinic visits fell significantly from 7.4 visits in I, 6.9 in II, and 6.4 in III (I upsilon III P = .004). Dropouts diminished significantly from 17% in I, to 10% in II, and 9% in III (I upsilon II or III P = .045). Modest positive changes in cholesterol and fasting blood sugar level occurred over time. In this general community setting, dramatic shifts in the choice of initial drug based upon application of JNC guidelines had little discernable impact on short term patient outcomes.

Antihypertensive drug therapy The effect of JNC criteria on prescribing patterns and patient status through the first year