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Biomedical subjects

M K Sridhar

Publications and source records attributed to M K Sridhar.

At least 19 recordsLinked to original sources
PubMed2001

Alternate nitrogen amendments for organic fertilizers.

The use of compost or manure in agriculture as an organic source of nutrients is common in many tropical, developing countries like Nigeria. One of the drawbacks of such materials is their low nitrogen (N) content (=1% N). Farmers commonly use chemical N fertilizers such as urea, calcium ammonium nitrate (CAN), and NPK formulations to obtain better crop growth and yield. These chemical supplements may have a negative impact on the environment through nitrate leaching into water, leading to eutrophication of surface waters that can affect public health. Gliricidia sepium, a fast-growing, tropical, perennial hedge plant was tested as a source of N in organo-mineral fertilizer formulations. Average nutrient content of Gliricidia is 3.8% N, 0.32% P, 1.8% K, 0.8% Ca, and 0.2% Mg. Using a sand culture and Amaranthus caudatus as a test crop, it was shown that amending commercial composts with 30% Gliricidia prunings would benefit many small-scale farmers and control environmental pollution.

Amaranthus↗
PubMed2000

Ground water in Nigerian urban centres: problems and options.

Results of a groundwater study in Nigeria in some of the major cities in the southern part, Lagos, Ibadan; in the eastern part, Warri, Benin, and Aba, and in northern part, Kano and Jos indicates that the quality of waters fell far below the WHO recommended levels for some of the quality parameters. The levels of nitrate, lead and coliform index were particularly far above the WHO limits, and some of the waters have higher levels of iron with low pH values. The quality is poor in high density or low-income areas. In addition Lagos waters also showed intrusion of salinity in the localities closer to the coast. Poor ground water quality was attributed to intrusion of sullage or gray water, indiscriminate defecation, and dumping of household refuse, industrial and hazardous wastes around the premises. Lead from locally produced gasoline and heavy road traffic in the urban centres, seepage of various leachates, inadequate governmental policies and poor implementation strategies, and indifferent attitudes of communities to the environment are some of the other identified reasons.

Developing Countries↗
PubMed1999

Nutrition and lung health.

There is an increasing interest in the relationship between nutrition and lung health. Epidemiological studies suggest that dietary habits may have an influence on lung function and the tendency to common lung diseases such as asthma, chronic obstructive pulmonary disease (COPD) and lung cancer. In particular, a diet rich in fresh fruit and fish has been associated with a salutary effect on lung health. End-stage COPD is associated with a state of nutritional depletion which is refractory to conventional nutritional supplementation. In contrast, malnutrition associated with cystic fibrosis is amenable to nutritional therapy, which has been shown to improve prognosis in this disease.

Animals↗
PubMed1998

Environmental and personal hygiene practices: risk factors for diarrhoea among children of Nigerian market women.

A Cross-sectional survey was carried out to determine the environmental and personal hygiene practices of mothers of children aged less than five years in two markets in Ibadan--one with poor sanitary conditions (Bodija) and the other one with better sanitation facilities (Gbagi). The study sought to identify the risk factors for diarrhoea among these children. Two hundred and sixty-six mothers in Bodija and 260 in Gbagi were interviewed. A questionnaire was used for collecting information on social and demographic characteristics, personal and environmental hygiene practices, including sources of food and water for their children, waste-disposal practices and occurrence of diarrhoea among their children aged less than five years. The educational status of the women in Bodija was lower than that of the women in Gbagi (p < 0.001). Sixty (23%) women of the Bodija market mentioned that tap water was the source of drinking water for their children, while 91 (34%) brought water from their homes, and 45 (17%) bought it from vendors in the market. The corresponding figures for women of the Gbagi market were 41 (16%), 98 (38%) and 19 (7%). Two hundred and thirty-four (90%) women in Gbagi prepared breakfast at home for their children compared to 216 (81%) women in Bodija. This difference was statistically significant (p < 0.05). Waste disposal and personal hygiene practices were poorer among the women in Bodija. Yet the occurrence of diarrhoea was not significantly different in both the markets. Risk factors for diarrhoea identified in this study were water and food bought from vendors, child defaecation practices, mothers' cleaning up practices after child's defaecation, and refuse-disposal practices. The inherent risk of sale of unwholesome food and water by vendors is a great concern for public health authorities in Nigeria. Efforts to control diarrhoea must not only be focused on improving mothers' knowledge about food hygiene but also on environmental hygiene practices within the community.

Adult↗
PubMed1998

Diarrhoea in children of Nigerian market women: prevalence, knowledge of causes, and management.

A cross-sectional survey was carried out among mothers of children aged less than five years in two markets in Ibadan, one with poor environmental sanitation and the other clean and well maintained. The study took place between September 1996 and March 1997. The questionnaire used for this survey sought information about the occurrence of diarrhoea among children aged less than five years, their mothers' knowledge about the management of diarrhoea and their practices, including care-seeking practices, and the use of oral rehydration solutions. Two hundred and sixty-six mothers were interviewed in the first market (Bodija) and 260 in the other (Gbagi). Thirty-seven percent of the children in the cleaner market (Gbagi) were said to have had diarrhoea within the last 3 months compared to 33% of the children in the unhygienic Bodija market (p > 0.05). These results suggest that environmental sanitation may not be a major determinant of diarrhoea among children of the two groups of market women. When their children had diarrhoea, 44% (Bodija) and 40% (Gbagi) of the mothers attended health centres, 33% (Bodija) and 32% (Gbagi) gave ORT at home, and 12% (Bodija) and 19% (Gbagi) purchased drugs at a chemist. The study further showed that, while only one-third of all respondents resorted to home-treatment of diarrhoea with ORS, more than 80% of them knew the components and composition of ORS solution. There is a need to continue to encourage mothers to use ORS and, thus, bridge the knowledge-practice gap in mothers' management of diarrhoea at home.

Adult↗
PubMed1995

An evaluation of integrated cardiopulmonary exercise testing in a pulmonary function laboratory.

Clinical exercise testing has been used mainly to assess the cardiac response to exercise. Integrative cardiopulmonary exercise tests (CPET) involving the measurement of the ventilatory, circulatory and metabolic response to exercise has largely been a research tool. We analysed the results of one hundred tests randomly chosen from a total of 472 exercise tests performed between January 1992 and June 1993 as clinical investigation in a pulmonary function laboratory. CPET was used (a) to identify the cause of effort limitation in patients where more than one illness could be relevant (26); (b) to obtain an objective measure of the exercise capacity of patients with respiratory or cardiac disease (31); (c) as monitor of response to treatment (11) and (d) in the investigation of unexplained dyspnoea (32). In 94 of the 100 cases CPET was able to provide an answer to the specific clinical question posed. In patients with unexplained dyspnoea (CPET identified a group who exhibit an inappropriate hyperventilatory response to exercise with no supportive evidence of cardiopulmonary disease. In a small minority of cases CPET gave non-specific results. We conclude that CPET is a useful investigation in the management of patients with cardiopulmonary disease and complements the various other investigations offered by a pulmonary function laboratory.

Adolescent↗
PubMed1994

Predicting resting energy expenditure in patients with musculoskeletal deformities.

UNLABELLED: The aim of this study was to assess the validity of the commonly used equations (Harris-Benedict (HB), Schofield (S) and equations based on midarm circumference (MAC) and midarm muscle circumference (MAMC) in predicting resting energy expenditure (REE) in a population of patients with musculoskeletal deformities. 20 kyphoscoliotic patients (15 female (F); 5 male (M); mean age 59.6 years) and 10 controls (7 F; 3M; 59.8 years) were studied. REE measured by indirect calorimetry (IC) with a ventilated canopy system (Deltatrac metabolic monitor) was not significantly different between patients and controls (Mean (SD) REE (MJ/24 h): PATIENTS: 5.48 (1.1); controls: 5.28(0.8)). In patients with deformities the Schofield equation gave values which were closest to measured REE (mean difference and limits of agreement IC vs S: 0.098 MJ/24 h; -0.822 and 1.018). The Harris-Benedict equation using height (Ht) and armspan (AS) in lieu of height also gave acceptable results (IC vs HB (Ht): 0.34; -0.638 and 1.318; IC vs HB (AS): 0.255; -0.683 and 1.253). Equations based on MAC and MAMC compared poorly (IC vs MAC equation: 0.398; -1.530 and 2.326; IC vs MAMC equation 0.687; -0.911 and 2.285). On regression analysis the equation REE = 0.295 (MAMC) + 0.0483 (AS) -0.0324 (age) -6.25 predicted REE best in the patient population (r(2) = 0.861).

Journal Article↗
PubMed1994

Resting energy expenditure and nutritional state of patients with increased oxygen cost of breathing due to emphysema, scoliosis and thoracoplasty.

BACKGROUND: Weight loss is a well recognised feature of patients with emphysematous chronic obstructive pulmonary disease (COPD). It has been suggested that this weight loss could be due to a hypermetabolic state resulting from the increased oxygen cost of breathing (OCB). To clarify the relation between resting energy expenditure (REE), nutritional state, and OCB these indices were measured in patients with respiratory impairment and an increased OCB due to COPD, scoliosis, and thoracoplasty. METHODS: Eighteen patients (six COPD, six scoliosis, six thoracoplasty) of mean (SD) age 59.9 (8.6) years (8M, 10F) and six controls (45.5 (9.9) years; 2M, 4F) were studied. OCB was estimated by the addition of dead space to the breathing circuit and REE was measured by indirect calorimetry using a ventilated canopy system. Height, arm span, weight, triceps skin fold thickness (TSF), mid-arm muscle circumference (MAMC), forced expiratory volume in one second (FEV1), and vital capacity (VC) were measured in all study subjects. RESULTS: OCB was elevated in all patient groups (mean 7.0 ml/l) compared with controls (1.9 ml/l). All patients with COPD, four with scoliosis, three with thoracoplasty, and none of the controls were < 90% ideal body weight. Mean (SD) measured REE as % predicted (Harris-Benedict equation) was 103.8 (7.6) in patients with COPD, 105.5 (10.9) in those with scoliosis, 106.3 (6.9) in the thoracoplasty patients, and 103.3 (3.4) in controls. One patient with COPD, two with scoliosis, two with thoracoplasty, but no controls were hypermetabolic (REE > 110% predicted). In all groups there was a negative relation between OCB and lung function (OCB v FEV1 r = -0.83 in COPD, -0.62 in scoliosis, -0.67 in thoracoplasty, and -0.76 in controls). There was no correlation between REE and OCB or MAMC. CONCLUSIONS: In patients with respiratory disease OCB (augmented ventilation) is related to lung function but not to REE. This is evidence against the hypothesis that hypermetabolism due to increased oxygen cost of breathing at rest is the sole or major cause of malnutrition in patients with lung disease.

Aged↗
PubMed1994

An out-patient nutritional supplementation programme in COPD patients.

Studies that have assessed the role of nutritional supplementation in patients with emphysematous chronic obstructive pulmonary disease (COPD) have shown conflicting results. Improved respiratory muscle strength and exercise capacity have been demonstrated following intensive and costly nutritional support programmes under controlled conditions. We have evaluated a simple programme of out-patient nutritional support in a clinical setting. Twelve malnourished COPD patients (9 male and 3 female; mean age 66 yrs; < 90% ideal body weight) were studied. Forced vital capacity (FVC), forced expiratory volume in one second (FEV1), estimation of maximal oxygen uptake (VO2max) during exercise, respiratory muscle strength (PImax and PEmax), and measurement of body weight, height, triceps skinfold thickness, and mid-arm muscle circumference were performed before and after a 4 month period of out-patient nutritional support. Patients were advised by a dietician on increasing their daily caloric intake by a minimum of 50% above estimated daily energy expenditure. Three patients withdrew from the study. The mean increase in body weight in the nine remaining patients after 4 months of supplementation was 0.3 kg. There was no significant improvement in the anthropometric measures, lung function, respiratory muscle strength or VO2max for the group as a whole. Three patients who gained more than 1 kg weight were from a higher socioeconomic background compared with those who failed to do so. We conclude that achieving weight gain and improving lung function by means of simple out-patient nutritional programmes in a clinical setting is difficult.

Aged↗