Wpływ melatoniny na profil dobowy ciśnienia u chorych z brakiem nocnego obniżenia ciśnienia tętniczego An influence of melatonin on circadian blood pressure rhythm in hypertensive subjects with lack of nocturnal blood pressure decline

Summary Background Melatonin may influence autonomic nervous system and affect circadian blood pressure rhythm. The aim of the study was to investigate and influence of endo genous plasma melatonin an catecholamines on circadian blood pressure in hypertensive subjects with lack of nocturnal blood pressure decline. Material and methods The study included 21 dippers (D) (M 7/F 14, age 55.4 ± 10.7 yrs) and 12 non-dippers (ND) (M 4/F 8 age 59 ± 6.4 yrs) divided according to systolic and mean blood pressure nocturnal decline < 10% of daytime values. Ambulatory BP monitoring (SpaceLabs 90207) was performed and blood samples for melatonin (MT) (RIA, pg/mL), noradrenaline (NA) (HPLC, pg/mL) and adrenaline (A) (HPLC, pg/mL) determination were withdrawn every 4 hours during day and night time. Results MT was significantly lower in ND as compared to D at 02 AM, (19.7 ± 14.4 vs 63.3 ± 33.2; P < 0.001, respectively), 06 AM (20.0 ± 12.2 vs 45.1 ± 25.0; P < 0.004, respectively) and 02 PM (5.4 ± 2.3 vs 7.6 ± 2.3, P < 0.015, respectively) while no differences were found in MEL be