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Biomedical subjects

S Oren

Publications and source records attributed to S Oren.

15 recordsLinked to original sources
PubMed1991

Left ventricular filling in the systemic hypertension of obesity.

Cardiac structure and systolic as well as diastolic functions were evaluated by 2-dimensional M-mode echocardiography in lean and obese patients who were either hypertensive or normotensive. Diastolic function, as assessed by diminished normalized early peak filling rate and prolonged duration of rapid filling, was decreased in hypertensive patients compared with normotensive patients (p = 0.02). When compared with lean patients with similar blood pressure levels, obese patients exhibited a lower normalized peak filling rate (p = 0.0014) but no difference in duration of rapid filling. A significant correlation was observed between the normalized peak filling rate and either body mass index or left ventricular (LV) mass (r = 0.355 and r = -0.32, respectively; p less than 0.001). Obese patients had greater LV end-diastolic and systolic dimensions (p less than 0.005 and p less than 0.02, respectively), LV wall thickness (p less than 0.05) and LV mass (p less than 0.007) than lean patients. Impairment of LV filling was most pronounced in obese hypertensive patients. It is concluded that the burden on the left ventricle imposed by obesity causes cardiac enlargement and impairment of LV filling regardless of levels of arterial pressure.

Adult↗
PubMed1991

Cardiovascular effects of isradipine in essential hypertension.

The immediate and short-term cardiovascular effects of oral isradipine therapy were evaluated in 11 patients with mild to moderate systemic hypertension. Isradipine, 5 mg administered orally, induced a significant reduction in arterial pressure from 165 +/- 6/88 +/- 3 mm Hg to 140 +/- 5/76 +/- 2 mm Hg (p less than 0.001) within 2.5 hours by a decrease in total peripheral resistance associated with an increase in heart rate and cardiac output. Contrary to the acute effect, oral therapy with isradipine for 3 months reduced arterial pressure through a decrease in total peripheral resistance but without causing an increase in heart rate or cardiac output or activation of the sympathetic nervous system. Isradipine slightly reduced left ventricular mass and improved cardiac systolic function and left ventricular filling. Renal blood flow increased, and renal vascular resistance (p less than 0.01) and total blood volume (p less than 0.002) decreased without a change in either sodium excretion or body weight. Thus, isradipine, when given for 3 months, decreased arterial pressure by reducing total peripheral resistance without activation of reflexive mechanisms. Its favorable effects on systemic hemodynamics, total blood volume, renal blood flow, and cardiac structure and function suggest isradipine to be an excellent choice for antihypertensive therapy.

Adult↗
PubMed1991

Left ventricular filling and stress response pattern in essential hypertension.

PURPOSE: To evaluate whether impaired left ventricular filling determines the hemodynamic responses to isometric and orthostatic stress in a population with mild essential hypertension. PATIENTS AND METHODS: The study population consisted of 32 patients with essential hypertension who were subdivided into those with preserved left ventricular filling (15 patients) and those with impaired left ventricular filling (17 patients). Echocardiograms were obtained before hemodynamic assessment was performed. Isometric stress and head-up tilt tests were done with a recovery period of at least 10 minutes between each to allow for blood pressure and heart rate to return to baseline. Hemodynamic reassessment was performed during the last minute of each test and at the end of the recovery period. Plasma epinephrine, norepinephrine, and dopamine levels were determined by radioenzymatic method. RESULTS: Isometric stress increased mean arterial pressure by 30% (p less than 0.0001) by an increase in cardiac output (p less than 0.0001) and total peripheral resistance (p less than 0.0001) associated with an increase in plasma catecholamine levels (p less than 0.0001). Patients with preserved left ventricular filling had an increase in arterial pressure predominantly through an elevation in cardiac output (17%, p less than 0.0001) associated with a small increase in plasma norepinephrine levels (p less than 0.05) and in peripheral resistance (11%, p less than 0.05). In contrast, patients with impaired left ventricular filling had an increase in arterial pressure mainly through an increase in peripheral resistance (25%, p less than 0.0001) that was associated with a 45% elevation in plasma norepinephrine levels (p less than 0.0001). Orthostatic stress (passive head-up tilt) caused an exaggerated decrease in stroke volume (p less than 0.01) and cardiac output (p less than 0.01) in patients with impaired left ventricular filling when compared with those with preserved diastolic function. CONCLUSION: Impaired left ventricular filling blunts the response of the heart to isometric and orthostatic stress. As a consequence, hypertensive patients with impaired ventricular filling respond to these stressors with enhanced sympathetic stimulation and exaggerated vasoconstriction.

Adult↗
PubMed1991

Immediate and short-term cardiovascular effects of fosinopril, a new angiotensin-converting enzyme inhibitor, in patients with essential hypertension.

Immediate and short-term cardiovascular effects of a new angiotensin-converting enzyme inhibitor, fosinopril, were assessed in 10 patients with mild to moderate essential hypertension. Administration of a 10 mg oral dose of fosinopril reduced mean arterial pressure (p less than 0.001) as a result of a 24% fall in total peripheral resistance (p less than 0.001). Short-term therapy (12 weeks) maintained the decrease in mean arterial pressure (p less than 0.05) by decreasing total peripheral resistance (p less than 0.01), without reflexive cardiac stimulation or expanding intravascular volume. Renal vascular resistance decreased (p less than 0.05) while renal blood flow, glomerular filtration rate and filtration fraction remained unchanged. The response pattern to mental, isometric and orthostatic stress was similarly unchanged. Left ventricular mass diminished by 11% (p less than 0.01); myocardial contractility was unaffected. Afterload was reduced (p less than 0.05), and velocity of circumferential fiber shortening and stroke volume increased (p less than 0.05). Thus, arterial pressure reduction produced by fosinopril was associated with improved systemic and renal hemodynamics and reduced left ventricular mass.

Adult↗
PubMed1991

Urinary albumin excretion in patients with familial Mediterranean fever: a pilot study.

Amyloidosis of the kidney is the most threatening complication in familial Mediterranean fever (FMF), and colchicine has been shown to reduce its occurrence. In the preclinical stage of kidney amyloidosis, no proteinuria is observed by the standard Albustix method. However, whether these patients have normal or increased urinary albumin excretion is not known. The purpose of this study was to evaluate albumin excretion in FMF patients treated with colchicine and to compare these values to those of a normal control group. Twenty-two subjects with FMF were compared with 16 normal subjects matched with regard to age and body surface area. The two groups did not differ with regard to female/male ratio and arterial pressure. Urine samples were collected overnight while patients were recumbent and in the daytime while they were ambulant. After measuring albumin concentration (Ua) by radio-immunoassay and creatinine concentration through the standard method, the urinary albumin excretion rate (UaV) and urinary albumin creatinine ratio (Ua/c) were calculated. In the FMF group, three patients had microalbuminuria--defined as an albumin excretion rate higher than 20 micrograms/min. Two of them had this condition only in the early morning collection. These three patients were characterized by a longer duration of symptoms (18 vs. 9 years). No patient in the control group had microalbuminuria. The mean UaV in the FMF group did not differ significantly from that of the control group.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

Twenty-four hour arterial pressure and heart rate as predictors of left-ventricular hypertrophy.

Hypertrophy of the left ventricle occurs in some but not all hypertensive patients. The present study was designed to examine the office and the 24-hour arterial pressure (AP) and heart rate (HR) recordings, and the AP response to physical stress in two age- and sex-matched hypertensive groups who differed in their left-ventricular mass (LVM). In addition, we tried to determine whether AP and HR measured at rest, under stress, or with 24-hour AP monitoring correlate with LVM. Ten hypertensive subjects with left-ventricular hypertrophy (LVH) made up the study group and 10 hypertensive subjects without LVH made up the control group. Antihypertensive medication was withdrawn at least four weeks prior to evaluation. The mean office AP measured during the washout period was 157 +/- 13/100 +/- 11 mm Hg in the study group and 157 +/- 17/104 +/- 7 mm Hg in the control group. However, 24-hour AP monitoring disclosed that the study group had significantly higher AP than the control group during both day and night. The control group had a significantly faster HR in the clinic and at night. The HR response to bicycle exercise was less in the control group than in the LVH group. The maximal AP and the rise in AP during bicycle exercise did not differ between groups. The LVM index did not correlate with the office AP or with maximal AP during effort, but did correlate negatively with the office HR and with the HR prior to the exercise test.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

Extrapulmonary tuberculosis: five case reports.

Since the 1950s, tuberculosis (TB) morbidity has been decreasing steadily in Israel. However, recent waves of Ethiopian immigrants have brought new cases and have renewed our awareness of the disease. As in other immigrant populations, the incidence of extrapulmonary TB is relatively high, challenging the clinician to make the correct diagnosis at an early stage. Many of the new immigrants settled in the Ashkelon are and were diagnosed and treated in our hospital. We present five cases of TB with extrapulmonary manifestations. Proof of TB infection was found in sites remote from the major clinical manifestation in four of the patients, emphasizing the difficulty in diagnosing the disease. Four of the patients recovered after treatment, but the patient admitted with neurological involvement remained comatose until her death.

Adult↗
PubMed1990

[The "Ashkelon" hypertension detection and follow-up program].

The program described aims at enhancing awareness of high blood pressure and other risk factors for cardiovascular disease (CVD) and promoting a healthy lifestyle. The study population consisted of 11,000 workers at worksites and visitors to community centers, aged 25-65 years. The program was carried out in cooperation with primary care clinics and non-pharmacological control of high blood pressure was by a community center for prevention of CVD. In 1980, 56.0% of hypertensives were unaware of their condition, while by 1988 this was reduced to 6.1%. Body weight reduction resulted in lowering of blood pressure which enabled cessation of all antihypertensive treatment in 25%. Deep muscle relaxation enabled cessation in 47%. The savings effected in terms of antihypertensive treatment outweight the total cost of the program 3-fold.

Adult↗
PubMed1990

Resource savings from non-pharmacological control of hypertension.

Treatment of acute cardiovascular illness is expensive, and a preventative approach may be cheaper. Since pharmacological costs account for a large proportion of costs in prevention programmes, a non-pharmacological approach such as that used by us in Ashkelon on mild hypertensives, relying on stress management, weight management and exercise aimed at reducing risk factors, might prove to be more cost-effective. After six months on a 1,000 calorie/day diet, 69 obese subjects (initial body mass index greater than 28 kg/m2) had reduced their weight by an average of 7.3 kg (P less than 0.005). This weight reduction contributed to a significant decrease in systolic blood pressure (SBP) from 157.3 to 137.6 mmHg (P less than 0.005) and diastolic blood pressure (DBP) from 101.1 to 85.2 mmHg (P less than 0.005), which was sustained at two-year follow-up. Pharmacological treatment could be stopped in about one-quarter of these cases. In non-obese mild-hypertensives, deep muscle relaxation and biofeedback techniques were prescribed. Significant decreases in SBP (153.1 to 138.3 mmHg, P less than 0.005) and DBP (101.2 to 90.1 mmHg, P less than 0.005) were achieved at six months. In nine out of 19 cases pharmacological treatment was stopped after six to eight months. Smoking cessation was achieved by individual instruction together with stress management techniques, physical exercise and a nicotine-based chewing gum. After six months 18 out of 30 heavy smokers had stopped smoking, and the remaining 12 had reduced their cigarette consumption.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1989

Disparate hemodynamic and sympathoadrenergic responses to isometric and mental stress in essential hypertension.

The hemodynamic and sympathoadrenergic responses during isometric handgrip and mental arithmetic tests were compared in 18 patients with mild essential hypertension. Mean blood pressure increased significantly after both maneuvers (27% during isometric stress and 10.7% during mental stress), but the increase was significantly higher during isometric stress (p less than 0.001). Both stressors increased the heart rate (p less than 0.001) and cardiac output (p less than 0.001). However, the total peripheral resistance behaved differently, for it increased during isometric stress (p less than 0.05) and remained unchanged during mental stress. Both stressors increased the epinephrine levels (p less than 0.005), but only isometric stress increased the norepinephrine levels (p less than 0.001). It is concluded that both stressors increase cardiac output by way of an increase in heart rate, but isometric stress also increases total peripheral resistance and thus causes a greater increase in arterial pressure. Isometric stress activates both the adrenergic and noradrenergic systems, thereby accounting for the exaggerated response in arterial pressure, whereas mental stress stimulates the adrenergic system only.

Adolescent↗
PubMed1989

Hemodynamic and humoral effects of intravenous dilevalol in patients with moderate hypertension.

The acute hemodynamic and humoral responses to intravenous dilevalol (10 to 390 mg) were evaluated in 10 patients with moderate hypertension. Dilevalol, in doses of 30 mg or more, decreased arterial pressure (p less than 0.0001) through a decrease in total peripheral resistance (p less than 0.0001) associated with an increase in stroke volume and cardiac output (p less than 0.0001). Heart rate increased moderately at doses above 190 mg. Plasma norepinephrine levels increased (p less than 0.05), but epinephrine levels remained unchanged. Plasma renin activity and level of atrial natriuretic peptide decreased (p less than 0.01 and p less than 0.01, respectively). The hypotensive and humoral changes persisted 3 hours after the last dose. Dilevalol modified the pattern of hemodynamic response to isometric stress, slightly enhancing the increases in peripheral resistance and blunting increases in cardiac output and heart rate. The response in arterial pressure during administration of dilevalol remained similar to that seen in the pretreatment phase. The results show that dilevalol, when given intravenously in a dose of 30 to 90 mg, reduces arterial pressure by reducing total peripheral resistance without acceleration in heart rate. On the basis of these hemodynamic effects, dilevalol should be further evaluated for treatment of hypertensive emergencies.

Adult↗
PubMed1989

Sex differences in cardiac adaptation to essential hypertension.

Left ventricular functional and structural adaptations to mild essential hypertension were assessed by 2D-guided M-mode echocardiography in a population of premenopausal and postmenopausal women (n = 29) who were matched with the same number of men with regard to mean arterial pressure, age and race. Premenopausal women had a thinner posterial wall (P less than 0.05), a smaller left ventricular systolic and diastolic diameter, and a smaller left ventricular mass than men with the same level of arterial pressure. Left ventricular performance indices, ejection fraction, velocity of circumferential fibre shortening, and the ratio of the end-systolic wall stress to the end-systolic volume index (a load-insensitive contractility index) were higher in women than in men. These sex differences were most pronounced before the menopause and tended to disappear thereafter. We conclude that in the presence of the same level of arterial pressure, women have smaller left ventricular dimensions and enhanced ventricular performance compared with men. These differences in cardiac adaptations between the genders may account for the lower risk of cardiovascular morbidity and mortality in premenopausal women with essential hypertension.

Adaptation, Physiological↗
PubMed1989

Perirenal and renal subcapsular haematoma as presenting symptoms of polyarteritis nodosa.

Two young men, were hospitalized due to acute massive blood loss with left abdominal flank pain. In both cases renal angiography showed signs of a haemorrhagic event in the left kidney, perirenal in one and subcapsular in the other. Microaneurysms indicated a diagnosis of polyarteritis nodosa, supported by renal biopsy in one case. Renal haemorrhage is an infrequent presentation of polyarteritis nodosa. Furthermore, one patient suffered also from familial Mediterranean fever, and is the fifth reported case with this combination of diseases.

Adult↗
PubMed1989

The antihypertensive effect of atenolol and bopindolol in the elderly.

The antihypertensive efficacy and tolerability of two betablockers: atenolol and bopindolol, was compared in a group of 30 elderly subjects aged 64.8 +/- 4.6 years. The daily dose of the two agents was relatively low. Atenolol 50-100 mg and bopindolol 0.5-1.0 mg sufficed to cause reduction of DBP to the target of less than or equal to 95 mm Hg, when applied as monotherapy. This was achieved in 75% of cases with bopindolol and in 93% of cases with atenolol. Atenolol, 50-100 mg/dd, lowered blood pressure from 173.7 +/- 13.2/103.7 +/- 3.0 (weekly) to 155.5 +/- 16.5/86.5 +/- 8.2 mm Hg (week 12) (P less than 0.005) while bopindolol, 0.5-1.0 mg, lowered blood pressure from 171.6 +/- 11.3/104.1 +/- 3.6 to 158.7 +/- 20.9/86.1 +/- 6.0 mm Hg (P less than 0.005). Heart rate was reduced from 80.5 (week 4) to 66.7 +/- 7.3 (week 12) by atenolol (P less than 0.0001), and from 83.7 +/- 11.8 (week 4) to 71.1 +/- 7.5 (week 12) by bopindolol (P less than 0.0001). Between treatment differences: comparisons yielded P values which were not sufficiently low to reject the null hypothesis of no difference between the two treatments. Well-being and short-term memory were not affected by either agent and tolerability of both drugs was good. These findings demonstrate that both bopindolol and atenolol are useful agents for control of hypertension in the elderly.

Adrenergic beta-Antagonists↗