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Increased arterial catecholamine concentrations in 50-year-old men with essential hypertension
Insights
Hypertensive men showed elevated arterial plasma concentrations of noradrenaline and adrenaline, suggesting increased sympathetic nervous system activity even in less severe hypertension. This indicates a potential link between catecholamines and hypertension. Keywords: hypertension, noradrenaline, adrenaline, catecholamines, sympathetic nervous system.
Area of Science:
- Cardiovascular Physiology
- Endocrinology
- Hypertension Research
Background:
- Essential hypertension is a complex condition often linked to the sympathetic nervous system.
- Previous research indicated elevated plasma catecholamines in men with long-standing, severe hypertension.
- The role of catecholamines in milder or shorter-duration hypertension remains less understood.
Purpose of the Study:
- To investigate plasma catecholamine levels in hypertensive men with shorter disease duration and less severity.
- To determine if elevated arterial and venous catecholamine concentrations are present in this hypertensive subgroup.
- To explore the relationship between arterial and venous catecholamine differences and hypertension.
Main Methods:
- Study included 23 hypertensive men and 17 age-matched normotensive controls.
- Plasma concentrations of adrenaline and noradrenaline were measured in arterial and venous blood.
- Supine heart rate and arterial-venous differences in catecholamines were analyzed.
Main Results:
- Hypertensive men exhibited increased supine heart rate, arterial noradrenaline, and arterial adrenaline compared to controls.
- Venous catecholamine levels did not significantly differ between the groups.
- Elevated arterial-venous differences for adrenaline were observed in hypertensive individuals.
Conclusions:
- Hypertension, even of shorter duration and lesser severity, is associated with increased arterial plasma catecholamines.
- The findings suggest heightened sympathetic nervous system activity in these hypertensive men.
- Further research is warranted to explore the clinical implications of these catecholamine alterations in hypertension.
Abstract:
In a recent study of 50-year-old men with long-standing, untreated essential hypertension we found increased arterial and venous plasma concentrations and arterial-venous differences of adrenaline (a-v) and noradrenaline (v-a) as compared to a matching normotensive control group. The aim of the present study was to investigate whether men of this age with hypertension of shorter duration and less severity than in the first study might also have increased plasma catecholamines. Twenty-three hypertensive and 17 age-matched normotensive control men were studied. The hypertensive ones had increased supine heart rate (P less than 0.05), arterial noradrenaline (P less than 0.01) and adrenaline (P less than 0.02) whereas venous catecholamines did not differ between the two groups. The a-v differences (means +/- SE) of adrenaline (78 +/- 14 vs 42 +/- 6 ng/l, P less than 0.05) were increased in the hypertensive compared to the normotensive group. In the hypertensive, the arterial plasma concentrations of the two catecholamines correlated positively (r = 0.71, P less than 0.001) as did the a-v differences (r = 0.54, P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)