Clinical evaluation of the vasodilator MDL-899 in patients with essential hypertension.
In this study of 10 patients with essential hypertension inadequately controlled by standard beta-blocker-diuretic combination therapy, the addition of 5 mg of MDL-899, a peripheral arteriolar vasodilator, resulted in significant reductions in blood pressure, both supine and standing, which was maximal 4-8 h after dosing, with no additional orthostatic component. There were associated small rises in heart rate but no evidence of significant activation of the sympathetic or renin-angiotensin systems. Six patients continued for 4 weeks receiving MDL-899 twice daily with significant improvement in their blood pressure control--from a mean of 182/95 to 146/77 mm Hg (supine) and from 161/93 to 138/79 mm Hg (erect). These six patients experienced no significant side effects, but four patients were unable to proceed with the study as a result of adverse effects, particularly headache, following the first few doses. It seems likely that these side effects are dose related. In a combined drug regimen, MDL-899 is an effective vasodilator drug that significantly improved the blood pressure control of patients with essential hypertension.
H L
HL
Elliott
L
L
Campbell
D J
DJ
Sumner
J L
JL
Reid
D000368:Aged; D000450:Aldosterone / Q000097:blood; D001794:Blood Pressure / Q000187:drug effects; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D006973:Hypertension / Q000188:drug therapy* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011724:Pyridazines / Q000009:adverse effects / Q000627:therapeutic use*; D012083:Renin / Q000097:blood; D013997:Time Factors; D014665:Vasodilator Agents / Q000009:adverse effects / Q000627:therapeutic use*
D011724:Pyridazines; D014665:Vasodilator Agents; D000450:Aldosterone; C038811:mopidralazine; D012083:Renin