A new study says that high blood pressure patients who excrete a slight excess of protein in the urine raise their risk of developing kidney and heart complications.
The study will be published in an upcoming issue of the Clinical Journal of the American Society Nephrology (CJASN).
Kidney dysfunction, common in individuals with hypertension, can increase one's risk of developing heart problems and kidney failure. Therefore, doctors should strive to identify and treat the precursors of kidney dysfunction as a way to maintain hypertensive patients' heart and kidney health.
Research shows that diabetic patients with hypertension who excrete slightly increased amounts of protein in the urine-a condition known as microalbuminuria-have an elevated risk of developing heart and kidney problems. Investigators have wondered whether microalbuminuria (occurring in 10 percent-30 percent of individuals, depending on age and clinical conditions) may have similar effects in non-diabetic patients with hypertension.
Over nearly 12 years, Roberto Pontremoli, MD, PhD (University of Genoa, in Italy) and his colleagues followed the health of 917 hypertensive, non-diabetic patients enrolled in the MAGIC (Microalbuminuria: A Genoa Investigation on Complications) study between 1993 and 1997. The investigators found that patients with microalbuminuria at the start of the study were 7.6-times as likely to develop chronic kidney disease and 2.1-times as likely to develop cardiovascular complications (such as heart disease or stroke) compared with individuals without microalbuminuria. Study participants with microalbuminuria also had a 3.2-fold increased risk of developing both kidney and cardiovascular conditions. Even after the researchers considered and adjusted for various patient characteristics that might contribute to health differences (age, body mass index, blood pressure, cholesterol level, and kidney function), individuals with microalbuminuria at the start of the study still had a 2.6-fold increased risk of developing both kidney and cardiovascular problems compared with those without microalbuminuria.
These results demonstrate that microalbuminuria has a profound effect on the health of non-diabetic patients with hypertension.
"Our findings emphasize the usefulness of a more widespread evaluation of microalbuminuria in an effort to guide the management of hypertension," said Dr. Pontremoli.