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Biomedical subjects

M H Alderman

Publications and source records attributed to M H Alderman.

At least 145 records · Page 8Linked to original sources
PubMed1986

Antihypertensive drug therapy withdrawal in a general population.

To determine the fraction of all hypertensives who can be successfully withdrawn from antihypertensive medication, a study was conducted of a patient group originally drawn from a screened population of union members. Of 157 patients, 88 (56.1%) met preestablished blood pressure criteria for drug interruption, and 66 (75%) actually had medication withdrawn. Of these 66 patients, 69.8% and 54.5% followed up for one and two years, respectively, remained normotensive. Patients requiring reintroduction of antihypertensive therapy were distinguished from those remaining drug free by increased systolic blood pressure (141.4 +/- 13.2 vs 131.6 +/- 8.6 mm Hg) after one month. Extrapolation of the finding that 28% of the study population remained normotensive one year after drug therapy withdrawal suggests the possibility that as many as 5 million Americans currently taking antihypertensive drugs could have therapy interrupted for at least one year and thus avoid both the hazards and costs of drug therapy.

Aged↗
PubMed1985

Step-down therapy for hypertension. Results in a community-based program.

The study reported here involved a systematic attempt to withdraw medication from participants in a community-based hypertension treatment program. Sixty-six of 88 patients with well-controlled mild or moderate disease had medication withdrawn after at least six months of treatment; nonpharmacologic intervention was not employed. After one year, 44 (66.6%) remained normotensive and drug free; after two years, 33 (50.0%). Of the 29 patients still available for three-year follow-up, 15 (51.7%) were still normotensive and drug free. Withdrawal of medication was associated with correction of hypokalemia and reversal of impaired glucose tolerance. Thus, nearly one fourth of these patients, who were believed to be reasonably representative of those with mild or moderate hypertension, could discontinue drug therapy and remain normotensive for at least one year. Substantial medical and economic benefits are to be realized from wide replication of this experience.

Aged↗
PubMed1985

Work-site as locus for hypertension care.

The widespread failure to control high blood pressure (BP) reflects a mismatch between therapist, treatment and patient. Occupationally based programmes which have transformed the method of care, as well as its relationship to the patient, have achieved signal success. Examination of the specific impact of locus of treatment reveals a small but measurable benefit of on-site therapy. Closer inspection reveals that it is the context in which the care is rendered rather than its physical location that is responsible for the satisfactory outcomes achieved. The locus of care, however, cannot be separated from its environment. Occupationally based programmes that are patient-centred, supportive and provide appropriate intervention succeed 'on' or 'off' site. The lesson for conventional sources of care, wherever they exist, is to reorient the process of care and its relation to the patient to over come the disincentives to persistence in successful care.

Female↗
PubMed1984

Standardization of M-mode echocardiographic left ventricular anatomic measurements.

To improve standardization of echocardiographic left ventricular anatomic measurements, echographic left ventricular dimensions and mass were related to body size indexes, sex, age and blood pressure. Independent normal populations comprised 92 hospital-based subjects (64 women, 28 men) and 133 subjects from a population sample (55 women, 78 men). All measurements of chamber size, wall thickness and mass differed between men and women in both series (p less than 0.01 to p less than 0.001). Left ventricular mass was related most closely to body surface area among measurements of body size (r = 0.37, p less than 0.01 to r = 0.57, p less than 0.001) in all four groups. Indexation by body surface area eliminated sex differences in wall thicknesses and internal dimension, but a significant sex difference in left ventricular mass index persisted (89 +/- 21 g/m2 in men versus 69 + 19 g/m2 in women in the entire series, p less than 0.0001). The 97th percentile of left ventricular mass index was identical in both groups of men (136 and 132 g/m2) and women (112 and 109 g/m2). A highly significant difference in lean body mass, estimated from 24 hour urine creatine excretion, was observed between men and women (58 +/- 15 versus 40 +/- 13 kg, p less than 0.001) and no sex difference existed in left ventricular mass indexed by lean body mass (3.4 +/- 1.3 versus 3.5 +/- 1.5 g/kg). Weak correlations were observed between left ventricular mass/lean body mass and systolic or diastolic blood pressure (r = 0.25, p less than 0.05 and r = 0.28, p less than 0.01, respectively) but not age (18 to 72 years).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1984

A comparative economic analysis of work-related hypertension care programs.

Cost of care and blood pressure control achieved were examined for individuals enrolled in two worksite hypertension control programs. In the first program, care was provided in a community-based setting by private physicians (model I-CBC); in the second program care was rendered by nurses under the supervision of a physician in work-based clinics (model II-WBC). In both situations, however, identification of employees with hypertension was effected through screening at the worksite. After adjustment for differences in labor market costs, annual average costs per client were found to be comparable for both programs. Blood pressure control (less than 160/95 mm Hg) was greater in model II-WBC than in model I-CBC. The average cost per unit of blood pressure reduction achieved by model II-WBC was +8.25 compared with +28.84 for model I-CBC, indicating a greater cost-effectiveness for worksite care programs.

Adult↗
PubMed1984

Contrast in cardiac anatomy and function between black and white patients with hypertension.

To determine whether cardiac findings differ between blacks and whites with essential hypertension, members of a well-defined working population in New York City were examined. Hypertensives had diastolic blood pressure ≤95, or systolic blood pressure ≤160 mmHg, or both, sustained on three occasions over three weeks. Normotensives were selected to reflect the age, sex, and race distribution of the total working population. Of 207 employees, 75 hypertensives (40 percent blacks) and 132 normotensives (53 percent blacks) under-went M-mode echocardiography. Left ventricular (LV) measurements and simultaneous blood pressure by mercury manometer were used to calculate LV mass index (LVMI), relative wall thickness (RWTd), cardiac output (CO) and total peripheral resistance (TPR). There were no differences in any variable between black and white normotensives. Black and white hypertensives were similar in age (52 ± 10 and 54 ± 12 yr, respectively) and blood pressure (151/100 ± 15/11 and 153/99 ± 18/8 mmHg). Black hypertensives had significantly higher TPR (1.80 ± 0.74 vs 1.43 ± 0.46, P<.01), lower CO (6.0 ± 2.5 vs 7.2 ± 2.4 L/min, P<.01), and higher RWTd (0.43 ± 0.11 vs 0.37 ± 0.07, P<.05) than white hypertensives. Race, per se, cannot explain these differences since they did not occur among normotensives. Rather, these findings may reflect a differing patho-physiology of hypertension in blacks and whites with similar blood pressure elevation.

Black or African American↗
PubMed1983

Increased excretion of urinary N-acetyl-beta-glucosaminidase in essential hypertension and its decline with antihypertensive therapy.

The urinary excretion of N-acetyl-beta-glucosaminidase (NAG) is increased in patients whose renal function is impaired by a variety of kidney diseases, and may provide an index of renal injury. To assess its role in essential hypertension, we measured urinary levels of NAG in 80 subjects with essential hypertension (and no evidence of renal disease) and 30 normal controls. NAG values were measured before therapy and after 3 and 12 months of treatment with diuretics. The mean urinary NAG value (+/- S.D.) for the normotensive subjects was 29 +/- 16 nmol per hour per milligram of urinary creatinine. The median value for the untreated hypertensive subjects was 53, and the mean was 65 +/- 61 (P less than 0.01). Systolic blood pressure was directly correlated with NAG levels, whereas diastolic pressure, age, sex, and race were not. Eighty patients followed for one year attained their ultimate blood-pressure reduction within three months (from a mean of 158/103 mm Hg to one of 138/91 mm Hg; P less than 0.001), whereas the urinary NAG level had not declined significantly at three months (from 60 +/- 43 to 54 +/- 54) but had changed significantly at one year (to 45 +/- 28; P less than 0.01 as compared with the initial value). These data suggest that NAG is frequently elevated in patients with high blood pressure even though there is no other evidence of renal damage, and that it can be reduced by successful antihypertensive therapy.

Acetylglucosaminidase↗
PubMed1983

Divalent cations in essential hypertension. Relations between serum ionized calcium, magnesium, and plasma renin activity.

We studied the relation of plasma renin activity to serum levels of ionized calcium and magnesium in 102 normotensive patients and in 98 patients with essential hypertension who were divided into low-renin, normal-renin, and high-renin groups. Serum magnesium levels were higher in patients with low-renin hypertension and lower in patients with high-renin hypertension than in those with normal-renin hypertension (P less than 0.025 for both comparisons) or in normotensive controls (P less than 0.005, P less than 0.05, respectively). In contrast, serum levels of ionized calcium were lower in patients with low-renin hypertension and higher in patients with high-renin hypertension than in those with normal-renin hypertension (P less than 0.001, P less than 0.05, respectively) or in normotensive controls (P less than 0.001, P less than 0.05, respectively). Altogether, the range of plasma renin activity in essential hypertension shows a continuous negative correlation with the serum magnesium level (r = -0.60, P less than 0.001) and a positive correlation with the serum ionized calcium level (r = 0.44, P less than 0.001). Accordingly, plasma renin activity in hypertension may reflect or contribute to changes in calcium and magnesium fluxes across cell membranes.

Calcium↗
PubMed1983

Cigarette smoking and renovascular hypertension.

A retrospective cohort study to investigate the association between smoking and renal artery stenosis compared 71 patients with documented renovascular hypertension and 308 age-matched control patients with essential hypertension. 94% (30/32) of men and 74% (29/39) of women with renal artery stenosis had smoked cigarettes compared with only 43% (64/150) of men and 41% (65/158) of women in the control group. This striking relation was true for both patients with fibromuscular disease (71% smokers; 15/21) and patients with atherosclerotic lesions (88% smokers; 44/50). All renal artery stenosis groups had significantly higher systolic and diastolic blood pressures than the relevant control group. When the groups were stratified according to blood pressure, there were significantly more smokers in the renal artery stenosis group at every level of blood pressure.

Diastole↗
PubMed1983

Occupationally-sponsored, community-provided hypertension control.

A hypertension control program established by the Massachusetts Mutual Life Insurance Company in 1977 included education, on-site case finding, and referral to community physicians with a company-based follow-up system facilitated by assumption of all costs by the company. Ninety-eight percent (2, 463) of the employees were screened; 11% (277) had hypertension. Of these, 59% were in treatment and 36% were controlled at entry. More than 84% of the hypertensives accepted referral to care and 79% fulfilled all program requirements. By the fifth program years, 70% had achieved blood pressure control. Mean blood pressure declined from 150/93 to 142/88 mm Hg. Absenteeism for all hypertensives averaged 4.7 in the three years before and 5.7 during the four years of the program. Employees active in the program had fewer average days of absenteeism (4.7) than inactive participants (6.8). Modest cost and a favorable employee/physician response has made this a highly acceptable as well as an effective company health program.

Absenteeism↗
PubMed1982

Effects of sample selection on the coincidence of hypertension and diabetes.

The occurrence of both hypertension and diabetes in patients at a general medical clinic at a university center and within a work-site community has been determined. In addition, the course of such patients for four years following presentation has been observed. The combination of hypertension and diabetes appeared more frequently, was expressed by greater severity, and coincided with a higher observed morbidity among the hospital clinic patients than among the work-site population. These findings regarding the prevalence and natural history of these coexistent diseases reaffirm that the source of a selected population can significantly affect the pattern of disease expression observed and, therefore, limit the capacity to extrapolate results from one population to another.

Blood Glucose↗
PubMed1981

High blood pressure diagnosis and treatment: consensus recommendations vs actual practice.

Diagnostic and treatment practices of institutional facilities treating high blood pressure in New York City were surveyed by mail in 1978. Respondents were adhering to the treatment recommendations of the Joint National Committee on Detection, Evaluation and Treatment of High Blood Pressure. Ninety-two per cent of respondents reported 90-104 mm Hg as the diastolic blood pressure level at which drug therapy was initiated, indicating a more aggressive approach than was warranted by the information available at the time of the survey.

Adult↗
PubMed1981

The potential effect of blood pressure reduction on cardiovascular disease. A cautionary note.

The risk of cardiovascular disease (CVD) at various levels of systolic blood pressure (BP) and the potential benefit of BP reduction have been estimated by constructing probability tables for extended periods based on the Framingham Study data. These estimates demonstrate that systolic BP alone delineates subgroups of persons with widely divergent risk of CVD, depending both on their demographic and clinical characteristic. For example, the disparity in prognosis is such that some persons with a systolic BP of 160 mm Hg are at greater risk of subsequent CVD than others with a systolic BP of 195 mm Hg. The potential benefit to be derived from systolic BP reduction shows similarly wide variation, so initial pressure alone does not precisely predict the gain that might accompany BP reduction. Measures of greater prognostic value are needed to enhance the value of BP determination.

Adult↗