Zinc and copper levels in serum, urine, and hair of humans in relation to blood pressure.

Zinc and copper status was evaluated in 63 early hypertensives and compared with that of 63 normotensives matched for sex, age, smoking habits and body mass index. Zinc and copper in serum, urine and hair were measured, and the serum activity of two zinc-dependent enzymes (AP and LDH) were analysed. Mean urinary copper concentration in patients was 14.11 micrograms g-1 creatinine compared with 9.16 micrograms g-1 creatinine in normotensive subjects (paired "t" = 3.94, p less than 0.001). Serum AP and LDH were significantly decreased (16 and 36%, respectively) in the patients compared with controls, although almost all values fell within the normal range of activities. Systolic and diastolic pressures were significantly and positively correlated to urinary copper excretion. These correlations were still apparent after correcting blood pressure values for other urinary measurements. Blood pressure levels (both systolic and diastolic) were also negatively correlated with the two zinc-dependent enzymes.