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Query: UMLS:C0020538 (hypertension)
 170,190 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The efficacy of captopril 25 mg/day as monotherapy or when necessary, in association with hydrochlorothiazide 25 mg/day, was studied during three months in 472 patients, average age 45 (17-59) years, 51% males with mild (73%) 95 less than PAD less than 104 mmHg, and moderate (27%) arterial hypertension 104 less than PAD less than 114 mmHg. Were included in the study hypertensive patients with previous antihypertensive therapy or when in the course of any previous antihypertensive treatment (52.4%) blood pressure control were not observed and side effects compromised patient's compliance. Captopril 25 mg/day was used once a day as single dose or subdivided in two daily doses (12.5 mg b.i.d.), during 30 days. If blood pressure was not normalized or dyastolic blood pressure drop was not equal or bigger than 10% after this period, it was added hydrochlorothiazide 25 mg/day. After three months under treatment, 411 (87%) patients normalized their dyastolic blood pressure DBP (less than 90 mmHg), from them, 273 (57.6%) had received only captopril and the others 138 (29.4%) with the addition of hydrochlorothiazide. The drop of mean arterial pressure, MAP = 2 DBP + 1 SBP was in average, 17.3 mmHg, in the 3 patients whose blood pressure normalized with captopril alone, and in average of 18.5 mmHg in those patients requiring addition of hydrochlorothiazide (difference without statistical significance). A small decrease of body weight, but with statistical significance (p less than 0.001) were observed during the use of captopril as monotherapy. Expressive reduction of side effects were observed during the period under captopril related to the period with previous antihypertensive therapy.
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PMID:[Treatment of mild and moderate hypertension with the use of captopril alone or combined with hydrochlorothiazide. A multicenter study]. 269 33

The hypotensive effects of 100 and 50 mg hydrochlorothiazide (HTZ) were evaluated in 30 mild-to-moderate hypertensives, divided into two groups, with diastolic pressure between 95 and 110 mmHg. In both groups, the average MAP reduction was 15% (P less than 0.05). There were no significant differences in antihypertensive effects between single (50 or 100 mg o.d.) and double (25 or 50 mg b.i.d.) doses of the same drug. Blood pressure control was better after two than after one month on each of the various dosing schedules. Side-effects were mild and well tolerated: observed was a significant increase in triglyceride level from 3.0 +/- 1.8 to 4.8 +/- 2.4 mmol/L under the treatment with 100 mg HTZ o.d. and a statistically significant decrease in potassium level from 4.4 +/- 0.3 mmol/L to 4.1 +/- 0.3 mmol/L after two months treatment with 50 mg HTZ o.d. Unexpectedly, these changes were not dose-related. The venous reflexes showed atenuated response to norepinephrine after HTZ treatment, while arterial inflow, venous capacity and venous outflow increased significantly (P less than 0.05). It is concluded that HTZ exhibits some direct vasodilator activity and that the pharmacokinetic features of this drug do not correlate with the pharmacodynamic ones. At least in the management of mild-to-moderate arterial hypertension single daily dosage is quite adequate.
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PMID:[Comparison of single and double doses of hydrochlorothiazide in the treatment of arterial hypertension with special emphasis on changes in vascular reactivity]. 277 Apr 3

With hypervolemia, hemoconcentration, high vascular resistance and hypertension the SIH offers opposite changes as the physiological pregnancy. The absence of a decrease in hematocrit and MAP is as yet not used as early screening possibility. Doppler flow measurements allow a detection of a fetal brain sparing effect which seems to be a typical answer to placental insufficiency. According to the till published results the hypervolemic hemodilution is of advantage for the mother and the fetus. With Doppler flow measurements we have a new method to verify therapeutic conceptions for the SIH.
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PMID:[Pregnancy-induced hypertension: maternal and fetal hemodynamics]. 280 10

The major findings of a review of the literature on platelet aggregation in hypertensive human subjects and the effects of antihypertensive agents were as follows: (1) There is an increased platelet aggregatory response to epinephrine and ADP in hypertensives with MAP greater than 120 mmHg. (2) Treatment with propranolol decreases the aggregatory response to ADP, but it may enhance the response to epinephrine. (3) Treatment with calcium blockers in normotensives decreases the aggregatory response to epinephrine. Further work needs to be done to answer the questions raised by this review. Since the major goal, yet unachieved, of antihypertensive therapy is reduction of the incidence of CHD, the anti-thrombotic or thrombotic potential of antihypertensive agents must be known. Future clinical trials of drug therapy for hypertension should be designed to include at least a determination of platelet aggregation in response to both ADP and epinephrine.
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PMID:Platelet aggregation in hypertension and the effects of antihypertensive treatment. 289 88

The authors determined the effect of profound induced hypotension (i.e., mean arterial blood pressure less than 50 mmHg) during craniotomy for cerebral aneurysm on cerebral blood flow and cerebral metabolic rate for oxygen before, during, and after (20 min and 40 min after) the hypotensive period. The study was performed on nine adults (mean age, 29.2 yr) who were awake and conscious without peripheral neurologic deficits at the time of surgery. The study was conducted with the dura open with the use of a radial artery cannula, a 7-Fr thermodilution flow-directed pulmonary artery catheter, and an internal jugular vein catheter. The 133xenon intraarterial injection technique was used to determine regional cerebral blood flow (rCBF) in the nonoperated hemisphere. rCBF remained unchanged (from 22.8 +/- 4.1 ml.100 g-1.min-1 to 23.8 +/- 4.6 ml.100 g-1.min-1) during the hypotensive period (MAP from 87.8 +/- 10.4 mmHg to 40.0 +/- 4.4 mmHg; P less than 0.001) despite an increase in cardiac index since cerebral perfusion pressure and cerebrovascular resistance decreased to a similar degree. No gross cerebral metabolic disturbances were observed. A period of decreased cerebrovascular resistance and increased rCBF followed induced hypotension. rCBF increased from 23.8 +/- 4.6 ml.100 g-1.min-1 to 30.0 +/- 5.8 ml.100 g-1.min-1 (P less than 0.001) 20 min after sodium nitroprusside (SNP) was stopped without rebound hypertension. These modifications disappeared 20 min later. Reduction of mean arterial blood pressure to 40 mmHg by SNP was apparently safe for the brain, although the possibility of low perfused regions and local brain and cerebrospinal fluid lactoacidosis, particularly in the retracted hemisphere, cannot be excluded.
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PMID:Cerebral blood flow and cerebral oxygen consumption during nitroprusside-induced hypotension to less than 50 mmHg. 291 60

We investigate the effect of a new angiotensin-converting enzyme inhibitor: Perindopril (IRIS) on regression of left ventricular hypertrophy (LVH), coronary blood flow and mechanical performance of isolated papillary muscle in renovascular hypertensive (Goldblatt 2 kidneys-1 clip) Sprague-Dawley male rats. Sham operated rats (G1) and half of hypertensive rats (G2) were studied after 8 weeks. The other half of 8 weeks long hypertensive rats (G3) were treated during 8 weeks with Perindopril in drinking water at a dosage adjusted to maintain blood pressure (BP) measured with tail cuff method under 140 mmHg. The study of each rat included 1) coronary blood flow and resistance measurements under resting conditions and after coronary dilation by carbochrome infusion (9 mg/kg) using left atrial injection of radioactive microspheres (method of Wicker and Tarazi) 2) the study of mechanical performance of the isolated papillary muscle 3) weight of left ventricle after separation of septum and free wall whose subendocardial and subepicardial layers were counted separately. Results (mean +/- SD): (table; see text) MAP: mean pressure. LV/BW: left ventricular mass (mg) per gram of body weight; CR (C): minimal coronary resistance after carbochrome (mmHg/ml/min/100 mg); DL/Dt: peak velocity of shortening at L max preload; Vrelax: peak velocity of relaxation; THR: time of half relaxation; p less than 0.05; p less than 0.01 compared to SHAM. In this model, hypertension induced a 50 p. 100 LVH whose regression was nearly complete after 8 weeks of treatment with Perindopril. Minimal coronary resistance after carbochrome were higher in hypertensive rats compared to sham and return to normal after regression of LVH.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Effects of perindopril on left ventricular hypertrophy, coronary reserve and mechanical properties of the papillary muscle of the rat with renovascular arterial hypertension]. 295 35

Patients with untreated essential hypertension had significantly higher plasma atrial natriuretic factor (ANF) levels (92.9 +/- 12.9 pg/ml, mean +/- SE) than those of age-matched controls (37.8 +/- 6.0 pg/ml; p less than 0.01). Plasma ANF levels in essential hypertensive patients showed a significant positive correlation with mean arterial pressure (MAP; r = 0.46, p less than 0.05) and an inverse correlation with plasma renin activity (PRA; r = -0.43, p less than 0.05). Plasma ANF levels after medication showed significant correlation with the decrease in MAP (r = 0.565, p less than 0.05). Patients with primary aldosteronism had significantly higher plasma ANF levels (122.4 +/- 30.2 pg/ml, n = 8) than those of controls (p less than 0.05). The levels returned to normal after extirpation of adrenal tumors. The response of plasma ANF levels in patients with primary aldosteronism to volume expansion with infusion of 2 L of physiological saline in 2 hours was greater than in controls. Such exaggerated response disappeared after surgical treatment. Infusion of angiotensin II (Ang II; 20 ng/kg/min) or norepinephrine (200 ng/kg/min) for 30 minutes to normal volunteers (n = 5) resulted in a rise in MAP (24.9 +/- 3.3 and 15.8 +/- 4.4 mm Hg, respectively) and a twofold increase in plasma ANF level. Infusion of the Ang II antagonist [Sar1, Ile8]Ang II (600 ng/kg/min) for 30 minutes, resulted in a rise in MAP (18.8 +/- 2.1 mm Hg) and more than a twofold increase in plasma ANF level in patients with essential hypertension (n = 6).(ABSTRACT TRUNCATED AT 250 WORDS)
Hypertension 1988 Feb
PMID:Atrial natriuretic factor in essential hypertension and adrenal disorders. 296 1

Sino-aortic denervation (SAD) in rats alters completely the pattern of pressure changes during sleep: from unchanged to a rise in SS and from slight increase to a market drop in DS. Rats with mild renal hypertension (1K - 1C) behaved like normotensive rats, whereas in those rats with hypertension accompanied by overactivity of RAS, the pattern of MAP changes during sleep was similar to SAD rats. Since acute SAD also produced overactivity of RAS we studied SAD rats treated with Captopril or when RAS was normal at the chronic phase of SAD and we showed that impairment of baroreceptor function per se determines the typical alteration of BP during sleep. Intracerebral infusion of angiotensin modifies the pattern of pressure changes during sleep in a way similar to that produced by impaired baroreceptor function (SAD), probably by altering the central integration of the baroreceptor reflexes. Therefore the pattern of pressure changes during sleep seems to be a sensitive index of the functional integrity of the baroreceptor reflex.
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PMID:Central angiotensin alters blood pressure regulation during natural sleep. 307 21

The prognosis of intracerebral haemorrhage is extremely poor when arterial hypertension is present. We investigated elastance of the brain tissue and brain hydraulic conductivity in normotensive (MAP approximately 110 mmHg) and hypertensive (MAP approximately 170 mmHg/angiotensin infusion) cats following a stereotactically produced intracerebral haemorrhage. For 12 hours after the onset of haemorrhage we registered the course of ICP, subsequently the water content of cortex, white matter and basal ganglia as well as the interstitial concentration of serum proteins in the corresponding regions were determined (Evans-Blue, immunofluorescence). Hypertension was associated with a slight increase in ICP and tissue water content but with a 3 fold more elevated content of interstitial serum proteins. Immunofluorescence analysis showed the oedema in the hypertensive group to be vasogenic in nature and in the normotensive cats to originate from the haematoma itself. The generally poor outcome of intracerebral mass haemorrhage in hypertensive subjects could be ascribed to the nature of the concomitant brain oedema, as described in this study.
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PMID:Pathomechanism of brain oedema in experimental intracerebral mass haemorrhage. 321 47

In 12 conscious dogs on a normal sodium diet the renal venous-arterial plasma renin activity-difference as a function of mean renal artery pressure (renin stimulus-response curve; RSRC) as well as long-term mean arterial blood pressure (MAP; pressure-histograms) were measured repeatedly. The RSRC has 1) a threshold pressure (Pth), 2) a flat section above Pth (plateau-level), and 3) a steep slope below Pth. From dog to dog the slope varied from -0.20 to -0.54 ng AI/ml/h/mmHg and Pth from 78.4 to 107.1 mmHg. In every dog MAP was higher than Pth (MAP-Pth:12.8 +/- 1.58 mmHg). Dogs with a higher Pth regularly showed a higher MAP (r = 0.76; P less than 0.005). Due to its normal variability arterial pressure occasionally falls below Pth and thus causes renin release. Therefore MAP will stabilize at a level above Pth. The pressor effect (MAP-Pth) of this feedback system should depend on the sensitivity of the pressure-dependent renin release mechanism (slope of RSRC). Accordingly we observed a close correlation between the slope of the RSRC and the MAP-Pth difference (r = 0.93; P less than 0.0001). We conclude that in healthy dogs the level of long-term blood pressure can be explained almost completely by Pth and the slope of the pressure-dependent renin release. Our findings may offer new perspectives to the pathogenesis of hypertension.
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PMID:Pressure-dependent renin release: the kidney factor in long-term control of arterial blood pressure in conscious dogs. 331 25


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