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Biomedical subjects

J M Bland

Publications and source records attributed to J M Bland.

At least 19 recordsLinked to original sources

Randomised controlled trial of effects of coordinating care for terminally ill cancer patients.

OBJECTIVES: To measure effects on terminally ill cancer patients and their families of coordinating the services available within the NHS and from local authorities and the voluntary sector. DESIGN: Randomised controlled trial. SETTING: Inner London health district. PATIENTS: Cancer patients were routinely notified from 1987 to 1990. 554 patients expected to survive less than one year entered the trial and were randomly allocated to a coordination or a control group. INTERVENTION: All patients received routinely available services. Coordination group patients received the assistance of two nurse coordinators, whose role was to ensure that patients received appropriate and well coordinated services, tailored to their individual needs and circumstances. MAIN OUTCOME MEASURES: Patients and carers were interviewed at home on entry to the trial and at intervals until death. Interviews after bereavement were also conducted. Outcome measures included the presence and severity of physical symptoms, psychiatric morbidity, use of and satisfaction with services, and carers' problems. Results from the baseline interview, the interview closest to death, and the interview after bereavement were analysed. RESULTS: Few differences between groups were significant. Coordination group patients were less likely to suffer from vomiting, were more likely to report effective treatment for it, and less likely to be concerned about having an itchy skin. Their carers were more likely to report that in the last week of life the patient had had a cough and had had effective treatment for constipation, and they were less likely to rate the patient's difficulty swallowing as severe or to report effective treatment for anxiety. Coordination group patients were more likely to have seen a chiropodist and their carers were more likely to contact a specialist nurse in a night time emergency. These carers were less likely to feel angry about the death of the patient. CONCLUSIONS: This coordinating service made little difference to patient or family outcomes, perhaps because the service did not have a budget with which it could obtain services or because the professional skills of the nurse-coordinators may have conflicted with the requirements of the coordinating role.

Anxiety

The Ring total knee replacement--a comparison of survivorship.

Long term results of joint replacement are frequently expressed as survivorship; it therefore becomes increasingly important to have the ability to make valid comparisons between survivorship tables in order to determine accurately the statistical significance of published differences. We present a statistical method for direct comparison of survivorship tables. We have applied this technique to evaluate the survivorship of the unconstrained, uncemented Ring total knee replacement first implanted in 1975 and compare this to contemporaneous constrained prostheses. There is a significant improvement in survival, which suggests a beneficial long-term effect on the bone/implant interface of this changing design concept.

Aged

[Correlation between the results of Doppler velocimetry with spectral analysis and the viscosity of cord blood].

The contribution of rheological factors to be impedance of blood flow in the umbilical artery as determined by continuous wave Doppler ultrasound was investigated. Of the 51 pregnancies recruited, six were complicated by pre-eclampsia, 10 by intrauterine growth retardation, 15 by both pre-eclampsia and fetal growth retardation, and there were 20 controls. A significant correlation was demonstrated between both plasma viscosity and gestational age and the resistance index used to characterize the Doppler waveform. Multiple regression analysis demonstrated that changes in plasma viscosity explained 55 p. cent of the variance seen in the resistance index and that this was statistically significant. This finding is, however, unlikely to be of clinical significance as whole blood viscosity had an insignificant effect on the impedance in the umbilical artery. We postulate that vascular factors such as the number and calibre of the placenta arterioles are a more important determinant of umbilical artery impedance.

Blood Flow Velocity

Inhibition of some mycotoxigenic fungi by iturin A, a peptidolipid produced by Bacillus subtilis.

Bacillus subtilis produces peptidolipid compounds of the iturin group that have been shown to have antifungal properties, but not all fungal species are sensitive to these compounds. In this study, the activity of iturin A, produced by B. subtilis strain B-3, was tested. Paper disks impregnated with various concentrations of iturin A were placed on agar plates seeded with conidia of toxigenic species of Fusarium, Gerlacia, Penicillium or Aspergillus. Most isolates were inhibited at iturin A concentrations as low as 4 micrograms/disk. Penicillium italicum, P. viridicatum, A. ochraceus and A. versicolor were most strongly inhibited by the iturin whereas P. citrinum and A. parasiticus were least sensitive to iturin A.

Anti-Bacterial Agents

The effect of nutritional intake on outcome of pregnancy in smokers and non-smokers.

The relationship between nutrient intake and pregnancy outcome (adjusted birth weight and gestational age) was investigated in randomly selected non-smokers (n97) and in heavy smokers (15 + cigarettes/d) (n72) booking for ante-natal care at a hospital in South London. Weighted dietary intakes (7d) were obtained at 28 and 36 weeks gestation. Birth weight was adjusted for gestational age, maternal height, parity and sex of infant. Compared with non-smokers, intakes of micronutrients and fibre were lower in smokers at both 28 and 36 weeks, and smokers reduced their intakes more in late pregnancy. The babies of smokers had a lower adjusted birth weight but there was no difference in length of gestation between smokers and non-smokers. After controlling for smoking, social class and alcohol consumption, nutrient intakes at 28 weeks were found to have no effect on adjusted birth weight. However, intakes of protein, zinc, riboflavin and thiamin at 36 weeks, and the change in intakes of these nutrients (plus iron) between 28 and 36 weeks, had independent positive effects on birth weight. Some of the effect of smoking on birth weight appeared to be mediated through differences in nutrient intakes. Smoking explained 14.3% of the variance in birth weight in this population and a further 2.4-7.2% was explained by change in nutrient intakes between 28 and 36 weeks. It is recommended that women in pregnancy do not reduce their dietary intakes in late pregnancy.

Analysis of Variance

Cigarette smoking and birthweight: type of cigarette smoked and a possible threshold effect.

The effects on birthweight of the number of cigarettes smoked and their tar, nicotine and carbon monoxide yields were investigated prospectively in 1309 pregnant women of whom 414 were smokers. Several approaches to modelling the effect of smoking were tried. These suggested that while both yield and quantity smoked were important, yield had the greatest effect. This led to an empirical approach whereby consistent smokers were divided into four categories according to whether they smoked a low or high quantity of cigarettes per day and whether they smoked low or high yield cigarettes. Using these four groups it emerged that women smoking a low quantity of low yield cigarettes had babies of a similar mean birthweight to those of non-smokers whereas those smoking a low quantity of high yield cigarettes had babies whose birthweight was reduced to the same degree (6% or more) as those of mothers who smoked higher quantities. This apparent threshold was estimated as 13 cigarettes/day and 15 mg/cigarette carbon monoxide. We conclude that brand smoked is at least as important as quantity and that in this population there is evidence for a threshold for tobacco smoke intake below which no discernible effect on birthweight is seen.

Birth Weight

The effects of smoking and drinking on the anthropometric measurements of neonates.

This study investigated the effects of smoking and alcohol consumption in pregnancy on length, head circumference, upper arm circumference and ponderal index, of neonates born to 1513 Caucasian women who delivered at St George's Hospital, south London. All measurements were adjusted for gestational age, maternal height, parity and sex of infant. Babies of smokers were shorter, had lower ponderal index and smaller upper arm circumference than those of non-smokers. After controlling for alcohol consumption, these differences remained (but with reduced statistical significance). There was no statistically significant difference in head circumference between smokers and non-smokers. Alcohol consumption at booking had no effect on growth measurements in non-smokers but had a significant, negative effect on all measurements in smokers. Drinking later in pregnancy had less effect. Alcohol appears to enhance the growth-retarding effect of smoking. It is suggested that both smoking and alcohol also have an inhibitory effect on fat deposition in babies, which contributes to the reduction in birthweight associated with smoking and drinking.

Alcohol Drinking

Effects on birthweight of alcohol and caffeine consumption in smoking women.

STUDY OBJECTIVE: Previous work found no effect on birthweight of alcohol and caffeine consumption in non-smokers but such an effect was found in smokers. This report investigates further the effects on birthweight of alcohol and caffeine at three stages of pregnancy in smoking women. DESIGN: This was a prospective population study. SETTING: District general hospital in inner London. PARTICIPANTS: Out of 1309 women who completed all pregnancy interviews, 895 were excluded because they did not smoke, leaving a sample of 414 smokers. MEASUREMENTS AND MAIN RESULTS: Number and brand of cigarettes smoked, and quantity of alcohol and caffeine consumed were obtained by interview at booking, 28, and 36 weeks gestation. Birthweight was corrected for gestation and adjusted for maternal height, sex of infant and parity. The effect on birthweight of alcohol consumption was not explained by the amount smoked in terms of quantity and yield. Similarly the effect of caffeine was independent of smoking. When alcohol, caffeine, and smoking were analysed together, alcohol and caffeine were both associated with reductions in birthweight. Alcohol was associated with a reduction of up to 8% after adjusting for tobacco and caffeine intake, and caffeine was associated with a reduction of up to 6.5% after adjusting for tobacco and alcohol intake. Women who at booking were heavy smokers (greater than or equal to 13 cigarettes/day or greater than or equal to 15 mg carbon monoxide/cigarette), heavy drinkers (greater than or equal to 100 g/week alcohol), and had high caffeine intake (greater than or equal to 2801 mg/week) had a predicted reduction in mean birthweight of 18% (95% CI 11% to 24%). CONCLUSIONS: It is well known that women who smoke in pregnancy have smaller babies than non-smokers. Our study suggests that if these women also drink alcohol and high quantities of caffeine then the risk of poor fetal growth is increased even further.

Alcohol Drinking

A note on the use of the intraclass correlation coefficient in the evaluation of agreement between two methods of measurement.

The intraclass correlation coefficient (rI) has been advocated as a statistic for assessing agreement or consistency between two methods of measurement, in conjunction with a significance test of the difference between means obtained by the two methods. We show that neither technique is appropriate for assessing the interchangeability of measurement methods. We describe an alternative approach based on estimation of the mean and standard deviation of differences between measurements by the two methods.

Blood Pressure Determination

Nutrient intakes during pregnancy: observations on the influence of smoking and social class.

The influence of smoking and social class on dietary intake in pregnancy was investigated in a random sample of smokers (greater than or equal to 15 cigarettes/d) and nonsmokers. A total of 206 subjects (94 smokers and 112 nonsmokers) completed a 7-d weighed dietary intake at 28 wk gestation and 178 completed a second assessment at 36 wk. Nonsmokers had higher intakes of almost all nutrients than did smokers and the nutrient density of their diet was greater. Energy intake was nonsignificantly higher in nonsmokers. Women in higher social classes had the highest nutrient intakes. Smokers were shorter than nonsmokers and tended to be of lower social class. After maternal height and social class were controlled for, smoking had a significant effect on intake of many micronutrients. Dietary intake was reduced in late pregnancy, particularly in smokers. These data suggest that smokers in all social classes have a poorer quality of diet.

Adult

Maternal activity and birth weight: a prospective, population-based study.

To determine the association between maternal activity and pregnancy outcome, the authors investigated the separate influences of time, physical effort, and posture at work, both at a job and in the home, on birth weight. Study subjects were 1,507 of 1,889 women appearing consecutively for antenatal care at a district general hospital in inner London, England, in 1982-1984. Data were collected prospectively by interview and examination at several stages of pregnancy. Multivariable linear regression was used to distinguish associations with physical activity from confounding by other factors. The mean birth weight of infants born to women in full-time employment was 49 g less than that for births to women not in paid work (95 percent confidence interval (Cl) 1-97 g). However, the difference was due to confounding, and after adjustment, full-time employment was associated with a 12-g increase in birth weight (95 percent Cl -39 to 63 g). There was little difference in birth weight related to gestational stage at leaving work. Duration, physical effort required, and energy expenditure in paid work and in work at home had no discernible association with birth weight. A small increase in birth weight was associated with increased hours of sleep. These data allow estimates of associations with birth weight as precise as 80 g. Within the range of activities performed by pregnant women in the population studied, birth weight is unlikely to be associated with maternal physical activity.

Adolescent

Social determinants of nutrient intake in smokers and non-smokers during pregnancy.

STUDY OBJECTIVE: The aim was to investigate the effects of social factors (education, income, marital status, partners' employment status, housing tenure, social class), smoking, and maternal height on the dietary intake of pregnant women. DESIGN: The study was a prospective investigation on a two phase sample. SETTING: The study involved women attending the antenatal clinic at a district general hospital. PATIENTS: A group of pregnant Caucasian women, selected because they were heavy smokers (15+ cigarettes/day) (n = 94) and a randomly selected sample of never smokers (n = 112) were studied. MEASUREMENTS AND MAIN RESULTS: Data on social factors were collected by interviewer administered questionnaire. A 7 day weighed intake method was used to determine dietary intake at 28 weeks gestation. In univariate analyses, income, housing tenure and social class had significant effects on intakes of both macro- and micronutrients, and maternal education and smoking had significant effects on intakes of micronutrients. Using a stepwise multivariate analysis with income, smoking and maternal education, income was a significant factor in the intake of most nutrients but this effect disappeared when social class and housing tenure factors were entered into the model. Only social class and housing tenure had any significant effect on intakes of macronutrients--energy, protein and fat. Smoking and maternal education were the most important determinants of quality of diet (nutrient density); other factors had only negligible effects. Income was the only significant factor in alcohol intake. It is suggested that the effects of social class and income are overlapping. CONCLUSIONS: Smoking, being renters of accommodation, and being of minimum education and low social class are risk factors for poor dietary intake. It is recommended that such higher risk groups be specifically targeted for nutritional advice in pregnancy.

Body Weight

Effects on birth weight of smoking, alcohol, caffeine, socioeconomic factors, and psychosocial stress.

OBJECTIVE: To investigate the effects of smoking, alcohol, and caffeine consumption and socio-economic factors and psychosocial stress on birth weight. DESIGN: Prospective population study. SETTING: District general hospital in inner London. PARTICIPANTS: A consecutive series of 1860 white women booking for delivery were approached. 136 Refused and 211 failed to complete the study for other reasons (moved, abortion, subsequent refusal), leaving a sample of 1513. Women who spoke no English, booked after 24 weeks, had insulin dependent diabetes, or had a multiple pregnancy were excluded. MEASUREMENTS: Data were obtained by research interviewers at booking (general health questionnaire, modified Paykel's interview, and Eysenck personality questionnaire) and at 17, 28, and 36 weeks' gestation and from the structured antenatal and obstetric record. Variables assessed included smoking, alcohol consumption, caffeine consumption, and over 40 indicators of socio-economic state and psychosocial stress, including social class, tenure of accommodations, education, employment, income, anxiety and depression, stressful life events, social stress, social support, personality, and attitudes to pregnancy. Birth weight was corrected for gestation and adjusted for maternal height, parity, and baby's sex. MAIN RESULTS: Smoking was the most important single factor (5% reduction in corrected birth weight). Passive smoking was not significant (0.5% reduction). After smoking was controlled for, alcohol had an effect only in smokers and the effects of caffeine became non-significant. Only four of the socioeconomic and stress factors significantly reduced birth weight and these effects became non-significant after smoking was controlled for. CONCLUSIONS: Social and psychological factors have little or no direct effect on birth weight corrected for gestational age (fetal growth), and the main environmental cause of its variation in this population was smoking.

Adolescent

Vitamin D deficiency and muscle strength in male alcoholics.

1. Chronic alcoholism may be complicated by proximal muscle weakness associated with a selective atrophy of type II skeletal muscle fibres. The histopathological findings are non-specific as identical changes are seen in proximal muscle weakness associated with various metabolic myopathies, including osteomalacia. 2. The maximum voluntary contraction (MVC) of the dominant quadriceps and plasma 25-hydroxycholecalciferol [25-(OH)D] were measured in male alcoholics and control subjects to determine whether vitamin D deficiency contributed to proximal muscle weakness. 3. In both groups MVC declined with age and was related to body build. The distribution of plasma 25-(OH)D was skewed in alcoholics, with the mean significantly lower than in control subjects. Seventeen per cent of patients (but none of the control subjects) had pronounced biochemical deficiency [plasma 25-(OH)D less than 10 nmol/l]. 4. Alcoholics were significantly weaker than control subjects, even after correcting for the effects of age, height and weight. The severity of associated liver disease (cirrhosis vs no cirrhosis) did not influence muscle strength. Variation in plasma 25-(OH)D and albumin made an insignificant contribution to the difference in MVC observed between patients and control subjects. 5. We conclude that proximal muscle strength is reduced in chronic alcoholism but that this is not due to associated vitamin D [25-(OH)D] deficiency or alcoholic cirrhosis.

Adult

Factors influencing the presence or absence of acute coronary artery thrombi in sudden ischaemic death.

Sudden ischaemic death results either from an episode of acute myocardial ischaemia consequent upon coronary thrombosis or from an arrhythmia arising within a scarred left ventricle. Very different proportions of these two groups have been reported in both clinical studies in resuscitated subjects with out-of-hospital ventricular fibrillation, and in necropsy series. In 168 cases of sudden death due to ischaemic heart disease coming to necropsy 73 (43.5%) had mural intraluminal coronary thrombi, 50 (29.8%) had occlusive intraluminal thrombi, and 45 (26.7%) had no intraluminal thrombi, giving a ratio of 2.7:1 for those with and without coronary thrombosis. Single vessel disease, the presence of acute infarction at autopsy and prodromal symptoms were positively associated with the presence of coronary thrombosis. Conversely, the presence of old myocardial infarction at necropsy, a known clinical history of ischaemic heart disease and triple vessel disease were associated with the absence of acute thrombosis. The reported variation in the incidence of coronary thrombi in sudden ischaemic death can be largely explained by selection of subjects with those clinical characteristics which are positively or negatively associated with coronary thrombosis.

Acute Disease

Correlation between Doppler flow velocity waveforms and cord blood viscosity.

The contribution of rheological factors to the impedance of blood flow in the umbilical artery as determined by continuous-wave Doppler ultrasound was investigated. Of the 51 pregnancies recruited, six were complicated by pre-eclampsia, 10 by intrauterine growth retardation, 15 by both pre-eclampsia and fetal growth retardation, and there were 20 controls. A significant correlation was demonstrated between both plasma viscosity and gestational age and the resistance index used to characterize the Doppler waveform. Multiple regression analysis demonstrated that changes in plasma viscosity explained 55% of the variance seen in the resistance index and that this was statistically significant. This finding is, however, unlikely to be of clinical significance as whole blood viscosity had an insignificant effect on the impedance in the umbilical artery. We postulate that vascular factors such as the number and calibre of the placental arterioles are a more important determinant of umbilical artery impedance.

Blood Flow Velocity