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Giuseppe Schillaci, MD; Gianpaolo Reboldi, MD, MSc, PhD; Paolo Verdecchia, MD

Arch Intern Med. 2001;161:886-891.

Background  Determination of serum creatinine concentration is recommended in all patients with hypertension as a marker of target organ damage. However, the possibility that creatinine values within the reference range might contribute to stratification of cardiovascular risk in essential hypertension has never been tested.

Patients and Methods  In the setting of the Progetto Ipertensione Umbria Monitoraggio Ambulatoriale Study, for up to 11 years (mean, 4 years) we followed up 1829 white patients with hypertension (mean ± SD age, 51 ± 12 years; 53% men; office blood pressure, 157/98 mm Hg) free of cardiovascular events and with normal pretreatment creatinine levels (men, <136 µmol/L [<1.5 mg/dL]; women, <120 µmol/L [<1.4 mg/dL]) who also underwent 24-hour blood pressure monitoring and electrocardiography before therapy.

Results  During follow-up, there were 175 fatal or nonfatal major cardiovascular morbid events (2.4 per 100 patient-years). Event rate increased progressively from the first to the fourth sex-specific quartiles of creatinine distribution (1.5, 2.3, 2.3, and 3.5 per 100 patient-years; P = .003 by log-rank test). After adjustment (in a multivariate Cox model) for age, sex, diabetes, cholesterol, smoking, left ventricular hypertrophy, and 24-hour pulse and mean blood pressures (P<.05 for all), creatinine concentration was an independent adverse predictor of cardiovascular morbid events (P = .01). The observed excess risk was 1.30 (95% confidence interval, 1.07-1.59) for a 20-µmol/L (0.23-mg/dL) increase in creatinine concentration.

Conclusions  A serum creatinine value within the reference range is a predictor of cardiovascular morbidity in white patients with essential hypertension. Its prognostic value persists after adjustment for several powerful confounders, including average 24-hour blood pressure and left ventricular hypertrophy.

From the Unit of Internal Medicine, Angiology, and Arteriosclerosis, the Departments of Clinical and Experimental Medicine (Dr Schillaci) and Internal Medicine (Dr Reboldi), University of Perugia Medical School, and the Department of Cardiology, "R. Silvestrini" Hospital (Dr Verdecchia), Perugia, Italy.

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