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Biomedical subjects

H Hemingway

Publications and source records attributed to H Hemingway.

At least 19 recordsLinked to original sources
PubMed2000

Waiting for coronary angiography: is there a clinically ordered queue?

Among over 3000 patients undergoing coronary angiography in the absence of a formal queue-management system, we found that a-priori urgency scores were strongly associated with waiting times, prevalence of coronary-artery disease, rate of revascularisation, and mortality. These data challenge the widely held assumption that such waiting lists are not clinically ordered; however, the wide variation in waiting times within urgency categories suggests the need for further improvements in clinical queueing.

Adult↗
PubMed1999

Angiotensin-converting-enzyme gene insertion/deletion polymorphism and response to physical training.

BACKGROUND: The function of local renin-angiotensin systems in skeletal muscle and adipose tissue remains largely unknown. A polymorphism of the human angiotensin converting enzyme (ACE) gene has been identified in which the insertion (I) rather than deletion (D) allele is associated with lower ACE activity in body tissues and increased response to some aspects of physical training. We studied the association between the ACE gene insertion or deletion polymorphism and changes in body composition related to an intensive exercise programme, to investigate the metabolic effects of local human renin-angiotensin systems. METHODS: We used three independent methods (bioimpedance, multiple skinfold-thickness assessment of whole-body composition, magnetic resonance imaging of the mid-thigh) to study changes in body composition in young male army recruits over 10 weeks of intensive physical training. FINDINGS: Participants with the II genotype had a greater anabolic response than those with one or more D alleles for fat mass (0.55 vs -0.20 kg, p=0.04 by bioimpedance) and non-fat mass (1.31 vs -0.15 kg, p=0.01 by bioimpedance). Changes in body morphology with training measured by the other methods were also dependent on genotype. INTERPRETATION: II genotype, as a marker of low ACE activity in body tissues, may conserve a positive energy balance during rigorous training, which suggests enhanced metabolic efficiency. This finding may explain some of the survival and functional benefits of therapy with ACE inhibitors.

Adipose Tissue↗
PubMed1999

Differences in biological risk factors for cardiovascular disease between three ethnic groups in the Whitehall II study.

This study compares risk factors for cardiovascular disease in civil servants of three ethnic groups screened as part of the Whitehall II cohort study. Previously identified risk factors for cardiovascular disease in 360 Afro-Caribbean and 577 South Asian subjects are compared with the 8973 white Caucasian subjects. Controlling for socio-economic status is more precise than in most previous studies of cardiovascular differences between ethnic groups. After controlling for socio-economic confounding factors, age and sex, South Asian subjects were found to have increased prevalence of hypertension (defined as either having systolic pressure of > 160, diastolic pressure of > 95 or being on antihypertensives) OR 2.3 (95% CI 1.6-3.3), diabetes OR 4.2 (95%, CI 3.0-5.8) and a high risk lipid profile, although total cholesterol was lower than in the white population. Afro-Caribbean subjects had more hypertension OR 4.0 (95% CI 2.8-5.7) and diabetes OR 2.8 (95% CI 1.7-4.6), but this was accompanied by a favourable lipid profile with low cholesterol and high HDL. Afro-Caribbean alcohol and smoking habits were low-risk. Socio-economic status was found to be an important confounding factor for ethnic differences in biochemical risk factors for cardiovascular disease. However, adjusting for socioeconomic class only attenuates observed differences; it does not abolish them.

Adult↗
PubMed1999

Determinants of socioeconomic differences in change in physical and mental functioning.

Continuous decline in functioning is not an inevitable consequence of ageing, as some individuals maintain high levels of functioning to old age. The origins of functional problems in old age are not only related to current circumstances, but may be traced back to earlier life-experiences. Previous analyses show that change in functioning is related to socioeconomic status, but it is uncertain to what extent these differences can be accounted for by the same health behaviours and material and psychosocial factors that are related to socioeconomic differences in morbidity and mortality. This paper investigates socioeconomic differences in change in mental and physical functioning in a relatively young and healthy population over a three year follow-up period. The data come from the Whitehall II Study of London based civil servants aged 39-63 in 1991-93. We measured functioning with the Short Form 36 (SF-36) General Health Survey and socioeconomic status by civil service employment grade. Among lower employment grade men the odds ratio of being in the quartile of rapid decline in mental and physical functioning was 1.79 and 1.56 respectively. For women the odds ratio for physical functioning was 1.34, but employment grade differences in mental functioning were inconsistent. Among men health behaviours were the most important determinants of employment grade differences in physical functioning change. In addition, material problems and job decision latitude accounted for employment grade differences in physical as well as mental functioning change. However, among women employment grade differences in change in physical functioning can not be accounted for with these risk factors. Analyses of change in determinants may provide further insight into the underlying pathways. Early detection of functional decline and intervention may be a key to better functioning in ageing populations.

Adult↗
PubMed1999

Are risk factors for atherothrombotic disease associated with back pain sickness absence? The Whitehall II Study.

STUDY OBJECTIVE: To explore the previously stated hypothesis that risk factors for atherothrombotic disease are associated with back pain. DESIGN: Prospective (mean of four years of follow up) and retrospective analyses using two main outcome measures: (a) short (< or = 7 days) and long (> 7 days) spells of sickness absence because of back pain reported separately in men and women; (b) consistency of effect across the resulting four duration of spell and sex cells. SETTING: 14 civil service departments in London. PARTICIPANTS: 3506 male and 1380 female white office-based civil servants, aged 35-55 years at baseline. MAIN RESULTS: In age adjusted models, low apo AI was associated with back pain across all four duration-sex cells and smoking was associated across three cells. Six factors were associated with back pain in two cells: low exercise and high BMI, waist-hip ratio, triglycerides, insulin and Lp(a). On full adjustment (for age, BMI, employment grade and back pain at baseline), each of these factors retained a statistically significant effect in at least one duration-sex cell. Triglycerides were associated with short and long spells of sickness absence because of back pain in men in fully adjusted models with rate ratios (95% confidence intervals) of 1.53 (1.1, 2.1) and 1.75 (1.0, 3.2) respectively. There was little or no evidence of association in age adjusted models with: fibrinogen, glucose tolerance, total cholesterol, apoB, hypertension, factor VII, von Willebrand factor, electrocardiographic evidence of coronary heart disease and reported angina. CONCLUSIONS: In this population of office workers, only modest support was found for an atherothrombotic component to back pain sickness absence. However, the young age of participants at baseline and the lack of distinction between different types of back pain are likely to bias the findings toward null. Further research is required to ascertain whether a population sub-group of atherothrombotic back pain can be identified.

Absenteeism↗
PubMed1999

Human angiotensin I-converting enzyme gene and endurance performance.

Human physical performance is strongly influenced by genetic factors. A variation in the structure of the human angiotensin I-converting enzyme (ACE) gene has been reported in which the insertion (I) variant is associated with lower ACE levels than the deletion (D) gene. We have previously reported that the I variant was associated with improved endurance performance in high-altitude mountaineers and British Army recruits. We now examine this genotype distribution in 91 British Olympic-standard runners (79 Caucasians). DNA was extracted from the buccal cells contained in 10 ml of saline mouthwash donated by the subjects, and the I and D variants of the ACE gene were identified by PCR amplification of the polymorphic region. There was an increasing frequency of the I allele with distance run [0.35, 0.53, and 0.62 for </=200 m (n = 20), 400-3,000 m (n = 37), and >/=5,000 m (n = 34), respectively; P = 0.009 for linear trend]. Among 404 Olympic-standard athletes from 19 other mixed sporting disciplines (in which endurance performance was not necessarily a key factor), the I allele did not differ significantly from that found in control subjects: 0.50 vs. 0.49 (P = 0.526). These results support a positive association of the I allele with elite endurance performance.

Alleles↗
PubMed1998

Current obesity, steady weight change and weight fluctuation as predictors of physical functioning in middle aged office workers: the Whitehall II Study.

OBJECTIVES: (i) To investigate the effects of current obesity, steady weight change and weight fluctuation on physical functioning and (ii) to determine whether associations are independent of coronary heart disease. DESIGN: Prospective cohort study with body mass index (BMI) measurements at four time points between the ages of 25 and 63 y. SETTING: British civil servants based in London offices at baseline. PARTICIPANTS: 6895 men and 3413 women aged 35-55 y at baseline. MAIN OUTCOME MEASURE: Physical functioning was assessed using the 10-item scale from the Short Form 36 Health Survey, with a score in the lowest quartile indicating poor physical functioning. RESULTS: After adjustment for age and confounders (employment grade, smoking, alcohol, exercise and menopausal status), current BMI was monotonically associated with poor physical functioning in women whereas a threshold effect at a BMI of 27 kg/m2 was seen in men. The odds ratio of poor physical functioning was 1.55 (95% confidence interval (CI) 1.02-2.35) amongst women and 1.04 (95% CI 0.77-1.41) amongst men with BMI 23-24.9 kg/m2 compared to those with BMI < 21 kg/m2. Women in the upper, compared to the lower, tertile of steady weight change, had an odds ratio of poor physical functioning of 1.79 (1.24-2.60) after adjustment for age, confounders, current BMI and weight fluctuation. Women in the upper, compared to the lower, tertile of weight fluctuation had an odds ratio of poor physical functioning of 1.70 (1.23-2.34) adjusting for age, confounders, current BMI and steady weight change. Adjustment for the presence of coronary heart disease did not substantially alter any of these associations. Steady weight change and weight fluctuation had no independent effects in men. CONCLUSION: Among women, current obesity, steady weight change and weight fluctuation are independently and monotonically associated with poor physical functioning. Development of overt coronary heart disease is unlikely to be the mechanism for these associations.

Adult↗
PubMed1998

Socio-economic status and blood pressure: an overview analysis.

BACKGROUND: Mortality rates from hypertension related diseases such as coronary heart disease, hypertensive heart disease, stroke and end stage renal disease show an inverse association with socio-economic status (SES). OBJECTIVES: To review the published literature in order to assess whether (i) there is an association between SES and blood pressure (BP), and if so whether this is explained by (ii) SES differences in treatment rates, or (iii) SES differences in established risk factors for hypertension, or (iv) psycho-social factors associated with SES. METHOD: A narrative systematic review of published articles identified from a MEDLINE search from 1966-1996 and manual searching of the retrieved articles' bibliographies. RESULTS: Lower SES was associated with higher mean BPs in almost all studies in developed countries. This inverse gradient was both stronger and more consistently found in women than in men. The magnitude of the association varied but generally was quite small, with age adjusted mean systolic BP differences of about 2-3 mm Hg between the highest and lowest SES groups. The finding of an SES gradient in BP, despite adjusting for treatment in some studies and the lack of consistent SES differences in hypertension treatment rates, makes differential treatment an unlikely explanation for the SES gradient in BP. A substantial part of the SES gradient was accounted for by the SES gradient in body mass index. Alcohol consumption across SES groups accounted for part of the association in men though few studies examined this issue specifically. In contrast, in undeveloped or developing countries a direct association between SES and BP has often been found which may reflect a higher prevalence of obesity, and higher salt and alcohol intakes among those of higher SES. The SES differences in BP were not detectable in most studies in children. There is little evidence that adverse psycho-social factors associated with low SES cause chronic elevations in BP. CONCLUSION: A major challenge in reducing the SES gradient in BP is to understand and prevent the SES differences in obesity, which are particularly large in women. Future research should be directed to this question.

Adult↗
PubMed1998

Cardiothoracic ratio and relative heart volume as predictors of coronary heart disease mortality. The Whitehall study 25 year follow-up.

AIM: To examine the association of radiographic measures of heart size with mortality from coronary heart disease. METHODS AND RESULTS: One thousand, one hundred and ninety-one male civil servants aged 40-69 years were followed-up for mortality over 25 years in relation to cardiothoracic ratio and relative heart volume. A high cardiothoracic ratio and relative heart volume predicted coronary (n = 196 deaths) and all-cause mortality, but not respiratory or malignant mortality. After adjustment for age, systolic and diastolic blood pressure, the highest (> or = 0.47) compared to the lowest quintile of the cardiothoracic ratio (< 0.40) was associated with a rate ratio of 1.84 (95% CI 1.14-2.97) for the effect on coronary heart disease mortality. Further adjustment for heart rate, smoking, cholesterol, angina and ECG ischaemia had little effect, reducing the rate ratio to 1.65 (95% CI 1.01-2.70). Similar rate ratios were observed for relative heart volume. CONCLUSIONS: Cardiothoracic ratio within the range considered 'normal' in clinical practice predicted coronary heart disease mortality independent of established coronary heart disease risk factors. The relative heart volume, which uses measurements from the lateral as well as the posteroanterior chest X-ray, did not predict coronary heart disease any better than the cardiothoracic ratio. The extent to which left ventricular mass and systolic dysfunction-- pathophysiological correlates of the cardiothoracic ratio and relative heart volume--are independent risk factors for coronary heart disease should be further investigated.

Adult↗
PubMed1998

Behavioural and biological correlates of physical functioning in middle aged office workers: the UK whitehall II study.

STUDY OBJECTIVES: (1) To identify behavioural and biological correlates of poor physical functioning and (2) to determine whether such associations are independent of disease. DESIGN: Potential correlates were obtained from questionnaires and screening visits at baseline and five year follow up. Physical functioning was measured at follow up using the 10 item scale from the short-form 36 health survey. SETTING: London offices at baseline. PARTICIPANTS: 10,308 civil servants (6895 men and 3413 women), with a median age (range) of 49 years (39-63) at follow up. MAIN RESULTS: Multiple logistic regression showed that cigarette smoking, physical activity, body mass index (BMI), triglycerides, fibrinogen, and insulin were independently associated with poor physical functioning for men. For women, physical activity, eating habits, body mass index, fibrinogen, and insulin were independently associated with poor physical functioning. For example, among men, current smokers who had smoked more than 20 pack years were 1.89 (95% CI 1.35 to 2.67) times as likely to have poor physical functioning as never smokers. Men with BMI of 30 kg/m2 or more were 1.71 (95% CI 1.13 to 2.59) times as likely to have poor physical functioning as those with BMI < 20 kg/m2. The corresponding odds ratio for women was 2.66 (95% CI 1.80 to 3.93). With the exceptions of fibrinogen and insulin, associations remained on exclusion of subjects with physical disease. CONCLUSIONS: Risk factors established for physical diseases are associated with poor physical functioning in a population of working age. These associations may be independent of current disease.

Adult↗
PubMed1998

Evaluation of a computer-generated discharge summary for patients with acute coronary syndromes.

The discharge summary from hospital to community physician contributes importantly to patient management, but deficiencies in its preparation are well documented. We sought to determine the preferences of general practitioners for standard dictated or computer-generated discharge summaries for patients with acute coronary syndromes. The majority (68.5%) of GPs preferred the computerized summary and particularly liked its comprehensive content, concise style, ease of access to relevant information, clarity and ease of reading. Most (66.9%) thought the computer-generated summary provided the clearer management plan and 70.8% recommended its use for other specialities. In addition, its speed of generation enables GPs to receive a summary within seven days of patient discharge.

Computers↗
PubMed1997

Is the SF-36 a valid measure of change in population health? Results from the Whitehall II Study.

OBJECTIVE: To measure within-person change in scores on the short form general health survey (SF-36) by age, sex, employment grade, and disease status. DESIGN: Longitudinal study with a mean of 36 months (range 23-59 months) follow up, with screening examination and questionnaire to detect physical and psychiatric morbidity. SETTING: 20 civil service departments originally located in London. PARTICIPANTS: 5070 male and 2197 female office based civil servants aged 39-63 years. MAIN OUTCOME MEASURES: Change in the eight scales of the SF-36 (adjusted for baseline score and length of follow up) and effect sizes (adjusted change standard deviation of differences). RESULTS: Within-person declines (worsening health) with age were greater than estimated by cross sectional data alone. General mental health showed greater declines among younger participants (P for linear trend < 0.001). Employment grade was inversely related to change; lower grades had greater deteriorations than higher grades (P < 0.001 for each scale in men; P < 0.05 for each scale in women except general health perceptions and role limitations due to physical problems). The greatest declines were seen among participants with disease at baseline, with the effects of physical and psychiatric morbidity being additive. Effect sizes ranged from 0.20 to 0.65 in participants with both physical and psychiatric morbidity. CONCLUSIONS: Health functioning, as measured by the SF-36, changed in hypothesised directions with age, employment grade, and disease status. These changes occurred within a short follow up period, in an occupational, high functioning cohort which has not been the subject of intervention, suggesting that the SF-36 is sensitive to changes in health in general populations.

Adolescent↗
PubMed1997

Association of angiotensin-converting enzyme gene I/D polymorphism with change in left ventricular mass in response to physical training.

BACKGROUND: The absence (deletion allele [D]) of a 287-base pair marker in the ACE gene is associated with higher ACE levels than its presence (insertion allele [I]). If renin-angiotensin systems regulate left ventricular (LV) growth, then individuals of DD genotype might show a greater hypertrophic response than those of II genotype. We tested this hypothesis by studying exercise-induced LV hypertrophy. METHODS AND RESULTS: Echocardiographically determined LV dimensions and mass (n=140), electrocardiographically determined LV mass and frequency of LV hypertrophy (LVH) (n=121), and plasma brain natriuretic peptide (BNP) levels (n=49) were compared at the start and end of a 10-week physical training period in male Caucasian military recruits. Septal and posterior wall thicknesses increased with training, and LV mass increased by 18% (all P<.0001). Response magnitude was strongly associated with ACE genotype: mean LV mass altered by +2.0, +38.5, and +42.3 g in II, ID and DD, respectively (P<.0001). The prevalence of electrocardiographically defined LVH rose significantly only among those of DD genotype (from 6 of 24 before training to 11 of 24 after training, P<.01). Plasma brain natriuretic peptide levels rose by 56.0 and 11.5 pg/mL for DD and II, respectively (P<.001). CONCLUSIONS: Exercise-induced LV growth in young males is strongly associated with the ACE I/D polymorphism.

Adult↗