PubMed Health⌕ Search

Biomedical subjects

L H Powell

Publications and source records attributed to L H Powell.

At least 19 recordsLinked to original sources
PubMed2003

A population-based longitudinal study of cognitive functioning in the menopausal transition.

BACKGROUND: No longitudinal studies have tracked cognitive performance through the menopausal transition and thus the impact of the transition on cognition, independent of aging, is not known. The authors hypothesized that a decline in cognitive functioning occurs as women progress through the menopausal transition, independent of age, educational level, family income, ethnicity, and baseline self-perceived health. METHOD: The authors began a population-based, longitudinal study in January 1996 with yearly follow-up interviews. This report includes follow-up through November 2001. The authors randomly selected African American and white women from a census of two contiguous Chicago communities. After screening for eligibility (age 42 to 52 years, premenopausal or early perimenopausal, no exogenous hormone use in the past 3 months, and no hysterectomy), 868 agreed to participate. Women who became pregnant, had a hysterectomy, or began using hormones were censored from that time onward. This study reports on 803 women for whom cognitive assessments were available. The authors assessed working memory (Digit Span Backward) and perceptual speed (Symbol Digit Modalities Test). RESULTS: Contrary to the hypothesis, the authors found small but significant increases over time during the premenopausal and perimenopausal phases. This trend was not accounted for by chronological age, education, family income, ethnicity, or baseline self-perceived health. CONCLUSIONS: Transition through menopause is not accompanied by a decline in working memory and perceptual speed.

Adult↗
PubMed2001

Body mass index in mid-life women: relative influence of menopause, hormone use, and ethnicity.

OBJECTIVE: To assess the relative influence of menopausal status and hormone use on body mass index (BMI) among a multiethnic sample of mid-life women. DESIGN: Cross-sectional telephone survey conducted at seven sites where each site targeted an ethnic minority group and Caucasians as part of Study of Women's Health Across the Nation (SWAN). SUBJECTS: A total of 7181 Caucasians, 3949 African-Americans, 1660 Hispanics, 562 Chinese Americans, and 803 Japanese Americans between ages of 40 and 55 y residing in or near Boston, Chicago, Detroit, Los Angeles, Newark, NJ, Oakland, CA, and Pittsburgh, PA. MEASUREMENTS: Self-reported BMI based on weight in kg divided by height in m(2) menopausal status, physical inactivity, postmenopausal hormone use, ethnicity, and age in years. RESULTS: Compared to premenopausal women (covariate adjusted M=27.3), women reporting a surgical menopause (M=28.2) or being in the perimenopausal transition (M=27.7 for early and 27.9 for late perimenopause) had higher BMI. Women reporting a natural menopause (M=27.4) did not have a higher BMI than premenopausal women, after adjusting for chronological age and other covariates. Hormone use was associated with lower BMI (M=26.5 vs 27.3). A comparison of effect sizes showed that menopausal status (F=13.1), followed by chronological age (F=24.0), were the least powerful predictors of BMI, whereas the more powerful predictors were physical activity level (F=1377.1) and ethnicity (F=400.5). CONCLUSIONS: The menopausal transition affects body mass index in mid-life, but the effect is small relative to other influences. Interventions to increase physical activity are highly recommended to prevent increases in adiposity common in mid-life.

Adult↗
PubMed2001

Medical illness, past depression, and present depression: a predictive triad for in-hospital mortality.

OBJECTIVE: The authors' objectives were to determine 1) whether major depressive disorder diagnosed according to DSM-IV criteria modified for the medically ill predicted in-hospital mortality better than major depressive disorder diagnosed according to inclusive DSM-IV criteria and 2) whether a history of depression and current depression predicted mortality independent of severity of physical illness. METHOD: Of 392 consecutive medical inpatients, 241 were interviewed within the first 3 days of admission and 151 were excluded from the study. Chart review and a clinical interview that included the Schedule for Affective Disorders and Schizophrenia were used to determine demographic variables, past psychiatric history, psychiatric diagnoses, and illness measures. Diagnoses included major depressive disorder and minor depression diagnosed according to DSM-IV criteria that included all symptoms regardless of etiology and according to criteria modified for the medically ill (hopelessness, depression, or anhedonia were used as the qualifying affective symptoms; depressive symptoms were eliminated if easily explained by medical illness, treatments, or hospitalization). The Charlson combined age-comorbidity index was used to measure severity of illness. RESULTS: A diagnosis of major depressive disorder based on criteria modified for patients with medical illness better predicted mortality than a diagnosis based on inclusive criteria. A past history of depression and the Charlson combined age-comorbidity index predicted in-hospital mortality, but demographic variables, pain, discomfort, length of stay, medical diagnoses, and minor depression did not. In the final multivariate logistic regression model, the Charlson combined age-comorbidity index, a modified diagnosis of major depressive disorder, and a history of depression were independent predictors of in-hospital death. CONCLUSIONS: Severity of medical illness, a diagnosis of major depressive disorder based on modified criteria, and a past history of depression independently predicted in-hospital mortality in medical inpatients.

Comorbidity↗
PubMed1996

Diagonal earlobe creases and prognosis in patients with suspected coronary artery disease.

PURPOSE: To determine whether high-risk patients with unilateral, bilateral, or no earlobe creases (ELC) have different prognoses for common sequelae of coronary heart disease. PATIENTS AND METHODS: Two hundred sixty-four consecutive patients from a university-based coronary care unit or catheterization laboratory were blindly followed up for 10 years, using questionnaires, medical records, and death certificates. The primary outcome measure was time to cardiac event; namely, coronary artery bypass graft (CABG), myocardial infarction (MI), or cardiac death. Analyses included log-rank tests and Cox proportional hazards regression modelling. RESULTS: The number of creased ears was significantly associated, in a graded fashion, with 10-year cardiac event free survival: 43.5% +/- 5.7%, 33.0% +/- 6.7%, or 17.5% +/- 4.6% (mean +/- standard error for 0, 1 or 2 ELC, respectively; P = 0.003). After adjustment for 10 known cardiac risk factors, including age and left ventricular ejection fraction, the relative risk for a cardiac event for a unilateral ELC, relative to 0 ELC, was 1.33 (95% confidence interval [CI] 1.10 to 1.61, P = 0.02), and for bilateral ELC, it was 1.77 (95% CI 1.21 to 2.59, P = 0.003). CONCLUSIONS: Ear lobe creases are associated, in a graded fashion, with higher rates of cardiac events in patients admitted to hospital with suspected coronary disease. In such patients, ELC may help to identify those at higher risk for sequelae for coronary disease.

Coronary Disease↗
PubMed1995

A new system for classification of cardiac death as arrhythmic, ischemic, or due to myocardial pump failure.

Existing classifications of cardiac death fail to incorporate current understanding of the pathophysiology of sudden cardiac death. We developed a new scheme for classifying cardiac death that defines 3 categories of underlying mechanism: primary arrhythmia, acute myocardial ischemia/infarction, and myocardial pump failure. Using this new system, we classified the mechanism of 106 definite cardiac deaths from the Recurrent Coronary Prevention Project. Fifty deaths (47%) were classified as arrhythmic, 46 (43%) as ischemic, and 9 (8%) as due to myocardial pump failure (1 death was not classifiable). All 36 witnessed arrhythmic deaths were sudden and 8 of 9 witnessed myocardial pump failure deaths were nonsudden. The 38 witnessed ischemic deaths were split evenly between sudden and nonsudden. Interrater agreement for the classification of mechanism was 100%. This classification scheme, if validated in subsequent studies, will provide a useful algorithm for classifying deaths by underlying mechanism.

Arrhythmias, Cardiac↗
PubMed1992

Type A behavior pattern: new perspectives on theory, assessment, and intervention.

Research on the Type A behavior pattern (TA) has been plagued by inadequate theory, insensitive assessment, and insufficient interventions. These problems (e.g., using global dichotomous ratings of TA) have contributed to several failures of TA to predict cardiovascular outcomes prompting concern for new approaches. Conceptual models are discussed, such as a transactional model of TA, social cognitive theories (e.g., self-evaluative processes), and associative network theory (e.g., how emotions distort information). The view of hostility as the only pathogenic feature of TA is questioned. The ethnographic gap in TA research is described, and detailed descriptive and experimental case studies are recommended. Profile measures that assess all dimensions of TA are urged along with contextually sensitive multimodal assessments. Unlike results of some correlational studies, controlled TA interventions, although few, have consistently yielded positive results. Study of TA within an expanded conceptual perspective is encouraged, especially controlled experiments and interventions.

Behavior Therapy↗
PubMed1988

Effects of type A behavioral counseling and severity of prior acute myocardial infarction on survival.

The hypothesis under investigation was that the beneficial effect of type A behavioral counseling on survival after acute myocardial infarction (AMI) was conditional on the functioning of the cardiovascular system, as determined by the severity of the prior AMI. Subjects were 862 nonsmoking coronary patients in the San Francisco Bay Area, randomized in 1978 to receive, over 4.5 years, cardiac counseling or cardiac counseling plus type A behavioral counseling. Sixteen baseline factors plus an interaction term (severity of AMI X behavioral counseling) were evaluated for their prognostic significance. Behavioral counseling was not a significant predictor of coronary death in the total cohort, but the interaction between counseling and severity of the prior AMI was (p less than 0.05). Thus, the total cohort was divided into 2 subgroups of mild or serious prior AMI, and independent predictors of survival were isolated within each subgroup. In the subgroup with mild prior AMI, independent predictors were anterior AMI (p = 0.02), plasma cholesterol (p = 0.02) and behavioral counseling (p = 0.05). In the subgroup with serious prior AMI, none of the factors evaluated made a significant independent contribution. These findings suggest that a reduction in type A behavior may exert the greatest protection against coronary death in that subgroup of patients for whom the biologic aspects of coronary artery disease are not advanced. They also demonstrate the importance of considering the level of cardiac functioning before determining predictors of survival or optimum postcoronary care.

Behavior Therapy↗
PubMed1988

Psychosocial and physiological predictors of sudden cardiac death after healing of acute myocardial infarction.

Several major prospective studies that have examined the relation between type A behavior and cardiac mortality have failed to find an association. Since psychosocial factors have been implicated in the etiology of sudden cardiac death, it is possible that this association may emerge if sudden cardiac death is distinguished as an outcome distinct from other cardiac mortality. Predictors of sudden death and other cardiac outcomes were examined using data from the Recurrent Coronary Prevention Project, a 4.5-year prospective clinical trial of 1,012 postinfarction patients begun in San Francisco in 1978. A unique set of risk factors was found for the differing outcomes: sudden cardiac death had predominantly psychosocial predictors while nonsudden cardiac death and nonfatal recurrences were predominantly predicted by biologic factors. Type A behavior was an independent predictor of sudden, but not nonsudden, cardiac death in this population (p = 0.04). These results are the first demonstration of a direct relation between stress and sudden cardiac death in a large prospective clinical study, and provide insight into the failure of past prospective studies to find an association between type A behavior and cardiac mortality.

Analysis of Variance↗
PubMed1987

Effect of discontinuance of type A behavioral counseling on type A behavior and cardiac recurrence rate of post myocardial infarction patients.

Three hundred post infarction participants who had received type A behavioral counseling in the Recurrent Coronary Prevention Project, (RCPP) agreed to be followed for 1 additional year after stopping 4.5 years of continuous type A behavioral counseling. One hundred fourteen participants who had served for 4.5 years as controls in the RCPP Study, thus receiving no type A behavioral counseling, volunteered to receive such counseling for 1 year. Eleven of the 300 previously type A counseled RCPP participants were lost to follow-up at the end of the additional year. The remaining 289 subjects at risk were found to have maintained their previously reduced intensity of type A behavior. Their previously observed relatively low cardiac recurrence rate during the additional year also did not significantly change. Ten of the 114 previous control RCPP participants were lost to follow-up at the end of the additional year. The remaining 104 subjects who had received a year's type A behavioral counseling showed a significantly reduced intensity of type A behavior and a similar significant decrease in both the cardiac mortality and morbidity rate. These results suggest that the decline in the intensity of type A behavior and also in the cardiac recurrence rate previously observed in post infarction subjects exposed to type A behavioral counseling persists for at least 1 year after cessation of such counseling.

Counseling↗
PubMed1986

Alteration of type A behavior and its effect on cardiac recurrences in post myocardial infarction patients: summary results of the recurrent coronary prevention project.

One thousand thirteen post myocardial infarction patients were observed for 4.5 years to determine whether their type A (coronary-prone) behavior could be altered and the effect such alteration might have on the subsequent cardiac morbidity and mortality rates of these individuals. Eight hundred sixty-two of these individuals were randomly assigned either to a control section of 270 participants who received group cardiac counseling or an experimental section of 592 participants who received both group cardiac counseling and type A behavioral counseling. The remaining 151 patients, serving as a "comparison group," did not receive group counseling of any kind. Using the "Intention-to-Treat" principle, we observed markedly reduced type A behavior at the end of 4.5 years in 35.1% of participants given cardiac and type A behavior counseling compared with 9.8% of participants given only cardiac counseling. The cumulative 4.5-year cardiac recurrence rate was 12.9% in the 592 participants in the experimental group that received type A counseling. This recurrence rate was significantly less (p less than 0.005) than either the recurrence rate (21.2%) observed in the 270 participants in the control group or the recurrence rate (28.2%) in those of the comparison group not receiving any special treatment. After the first year, a significant difference in number of cardiac deaths between the experimental and control participants was observed during the remaining 3.5 years of the study. Overall, the results of this study demonstrate for the first time, within a controlled experimental design, that altering type A behavior reduces cardiac morbidity and mortality in post infarction patients.

Behavior Therapy↗
PubMed1985

Reduction in type A behavior in healthy middle-aged American military officers.

One hundred eighteen senior officer-students of the U.S. Army War College who were healthy but exhibited type A behavior volunteered to be randomly selected and enrolled into (1) a section of 62 officers who received group type A behavior counseling for 9 months and (2) a control section of 56 officers who received no counseling of any kind. Marked or profound reduction in type A behavior at the end of 9 months was observed in 41.9% of the 62 participants who initially were enrolled to receive type A counseling; marked or profound reduction in type A behavior, however, was observed in only 8.9% of the 56 initially enrolled control subjects. No adverse effects on the military leadership qualities of type A counseled participants were observed by their classmates. Serum total cholesterol and plasma high-density lipoprotein (HDL) cholesterol measurements were obtained monthly. The serum cholesterol of the total cohort of subjects rose significantly during a month of considerable emotional tension and stress. Those subjects who underwent a profound reduction in the intensity of their type A behavior pattern also exhibited a significantly lower serum cholesterol value as the study continued than those subjects who exhibited no change in their type A behavior. No significant changes in plasma HDL cholesterol concentrations were observed in the total cohort during the above-mentioned period of stress, nor were any differences in this particular measurement noted between the type A counseled and the control participants.

Adult↗
PubMed1985

Behavioral and physiologic determinants of long-term prognosis after myocardial infarction.

We studied the accuracy of predictions of long-term prognosis after infarction in a sample of 118 non-smoking, post-coronary males using: behavioral indices only; physiologic risk factors only; and a combination of behavioral indices and physiologic risk factors. To isolate valid behavioral indices, we measured 49 signs and symptoms of a lifestyle characterized by chronic struggle from videotapes of subjects undergoing a structured interview. Of these, 15 had a univariate relationship to recurrent cardiac events, and four--intensity, self-involvement, periorbital pigmentation and arousal while driving--had a multivariate relationship. Of six physiologic risk factors, one--the Peel Index--was related to recurrent cardiac events. Separately, each model achieved approximately 70% accuracy in classifying subjects into their future reinfarction status; jointly, predictive accuracy increased to 75%. The results suggest that living a lifestyle of chronic struggle increases risk for recurrent myocardial infarction, independently of the risk incurred by standard physiologic risk factors. The need for precise assessment of individual signs and symptoms of this lifestyle and implications for secondary prevention are discussed.

Arousal↗
PubMed1984

Alteration of type A behavior and reduction in cardiac recurrences in postmyocardial infarction patients.

Eight hundred sixty-two postmyocardial infarction patients volunteered to be randomly selected and enrolled into: (1) a control section of 270 patients, who received group cardiologic counseling; and (2) an experimental section of 592 patients, who received group type A behavior counseling in addition to group cardiologic counseling. Reduction in type A behavior at the end of 3 years was observed in 43.8% of the 592 participants, who initially were enrolled to receive group cardiologic and type A behavioral counseling. This degree of behavioral reduction was significantly greater than that observed in participants who initially were enrolled to receive only group cardiologic counseling. The 3-year cumulative cardiac recurrence rate was 7.2% in participants who initially were enrolled to receive group cardiologic and type A behavioral counseling. This was significantly less (p less than 0.005) than that (13%) observed in participants who initially were enrolled to receive only cardiologic counseling. This difference in recurrence rates was due to a lesser incidence of nonfatal infarctions in the patients who had been enrolled in the section receiving type A behavioral as well as cardiologic counseling. These data suggest that type A behavior can be altered in a sizable fraction of postinfarction patients and that such alteration is associated with a significantly reduced rate of nonfatal myocardial infarctions.

Behavior↗
PubMedDate not supplied

Can the type A behavior pattern be altered after myocardial infarction? A second year report from the recurrent coronary prevention project.

The feasibility of altering a Type A style of life was investigated in 1012 nonsmoking predominantly male postinfarction volunteers in the San Francisco Bay area. A total of 862 were randomly allocated into an experimental section receiving a combination of Type A and cardiac counseling, or a control section receiving cardiac counseling alone. The remaining 150 formed a nonrandom but statistically equivalent comparison section. Assessments of change in Type A behavior were made by the participant, his or her spouse, a work colleague, and an independent rater of a videotaped structured interview. Psychometric analyses indicated that these instruments were valid and reliable measures of Type A behavior. After 24 months, participants receiving Type A/cardiac counseling exhibited a significantly greater reduction in Type A behavior than the other two sections, and had a lower cardiovascular recurrence rate than the comparison section only. No differences among the three sections were observed in total cholesterol or resting blood pressure. The results suggest that Type A behavior can be altered by group counseling in postinfarction volunteers and that such alteration is superior to no group counseling at all in the secondary prevention of coronary heart disease.

Attitude↗