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Biomedical subjects

S M Ahmed

Publications and source records attributed to S M Ahmed.

At least 19 recordsLinked to original sources
PubMed2000

A simple kinetic spectrophotometric method for the determination of oxamniquine in formulations and spiked biological fluids.

A simple and sensitive kinetic method for the determination of oxamniquine in pharmaceutical preparations and biological fluids was developed. The procedure is based upon a kinetic investigation of the oxidation reaction of the drug with alkaline potassium permanganate at room temperature for a fixed time of 20 min. The absorbance of the colored manganate ions was measured at 610 nm. Alternatively, the decrease in the absorbance of potassium permanganate after addition of the drug was measured at 525 nm. The absorbance concentration plots in both procedures were rectilinear over the range 0.5-4 microg ml(-1). The concentration of oxamniquine is calculated using the corresponding calibration equation for the fixed-time method. The determination of oxamniquine by fixed-concentration and rate-constant methods was feasible with the calibration equations obtained but the fixed time method had been found to be more applicable. Both procedures were applied to the determination of oxamniquine in formulations. The results obtained were in good agreement with those obtained using the official method. The fixed time method of 20 min was further applied to spiked human urine and plasma, the recoveries (%) were 100.94 +/- 0.57 and 98.07 +/- 0.88 for urine and plasma, respectively, at 610 nm, and 97.51 +/- 1.27 and 95.69 +/- 1.23 for urine and plasma, respectively, at 525 nm.

Body Fluids↗
PubMed2000

Gender, socioeconomic development and health-seeking behaviour in Bangladesh.

In efforts to reduce gender and socioeconomic disparities in the health of populations, the provision of medical services alone is clearly inadequate. While socioeconomic development is assumed important in rectifying gender and socioeconomic inequities in health care access, service use and ultimately, outcomes, empirical evidence of its impact is limited. Using cross-sectional data from the BRAC-ICDDR,B Joint Research Project in Matlab, Bangladesh, this paper examines the impact of membership in BRAC's integrated Rural Development Programme (RDP) on gender equity and health-seeking behaviour. Differences in health care seeking are explored by comparing a sample of households who are BRAC members with a sample of BRAC-eligible non-members. Individuals from the BRAC member group report significantly less morbidity (15-day recall) than those from the non-member group, although no gender differences in the prevalence of self-reported morbidity are apparent in either group. Sick individuals from BRAC member households tend to seek care less frequently than non-members. When treatment is sought, BRAC members rely to a greater extent on home remedies, traditional care, and unqualified allopaths than non-member households. While reported treatment seeking from qualified allopaths is more prevalent in the BRAC group, non-members use the para-professional services of community health care workers almost twice as frequently. In both BRAC member and non-member groups, women suffering illness report seeking care significantly less often than men. The policy and programmatic implications of between group and gender differences in care seeking are discussed with reference to the literature.

Adolescent↗
PubMed2000

LC assay method for oxfendazole and oxyclozanide in pharmaceutical preparation.

A method has been developed for the simultaneous determination of oxfendazole and oxyclozanide in a pharmaceutical preparation. The method involves reversed phase chromatography with isocratic elution of the mobile phase and detection at 300 nm. The range of quantification for oxfendazole and oxyclozanide was found to be 2-7 microg ml(-1) and 3-10 microg ml(-1), respectively. The validity of the method was evaluated in terms of linear regression analysis, precision, specificity and accuracy.

Antiplatyhelmintic Agents↗
PubMed2000

ECG data compression using optimal non-orthogonal wavelet transform.

This paper introduces an effective technique for the compression of electrocardiogram (ECG) signals. The technique is based on a new class of non-orthogonal discrete wavelet transform (DWT). The performance of ECG compression algorithm is measured by its ability to minimize distortion while retaining all clinically significant features of the signal. The percent root-mean square difference (PRD) is used as an accepted standard for measuring the signal distortion. However, there is no standard for measuring the clinically significant features retained after signal reconstruction. The coefficients of the DWT are calculated such that the square of the difference between the original signal and the reconstructed one is minimum in least mean square sense. The resulting transforms deal with signals of arbitrary lengths; that means the signal length is not restricted to be a multiple of power of 2. Numerical results comparing the performance of the constructed non-orthogonal transform with that of W-transform and Daubechies D(4) orthogonal transform are given. These results show that, independent of signal length, the decomposition of the signal up to the fourth level is sufficient for getting minimum PRD. In addition, the proposed technique yields the lowest PRD compared to the other two algorithms and for a compression ratio less than 10 the optimal transform can be obtained for only one ECG period. However, for a higher compression ratio the PRD is smaller for long signals.

Algorithms↗
PubMed2000

"The history of health in Dayton": a community-academic partnership.

Academic institutions have always found it a challenge to persuade community members to participate in academic research projects. Starting an open dialogue is usually the critical first step. To begin this dialogue with community members in Dayton, Ohio, in 1999, staff from Wright State University decided to organize a community forum, "The History of Health in Dayton." The forum was intended as the first project of a new research organization, the Alliance for Research in Community Health (ARCH), established with federal funding from the Health Resources and Services Administration in 1998. ARCH was created as a bridge between the Department of Family Medicine of Wright State University School of Medicine and the Center for Healthy Communities, a health advocacy and service organization committed to health professions education. ARCH's mission is to improve the health of citizens of Dayton through research involving community participation. Through ARCH, community members help researchers define priorities, resolve ethical issues, refine procedures, and interpret results. Guidelines for participatory research, proposed by the National Primary Care Research Group in 1998 and adopted by the alliance, emphasize the importance of open dialogue among researchers, subjects, academics, and community members. The initial response to the forum was enthusiastic, with a majority of community residents expressing interest in attending future presentations.

Community Health Planning↗
PubMed2000

Stretch-induced injury alters mitochondrial membrane potential and cellular ATP in cultured astrocytes and neurons.

Energy deficit after traumatic brain injury (TBI) may alter ionic homeostasis, neurotransmission, biosynthesis, and cellular transport. Using an in vitro model for TBI, we tested the hypothesis that stretch-induced injury alters mitochondrial membrane potential (delta(psi)m) and ATP in astrocytes and neurons. Astrocytes, pure neuronal cultures, and mixed neuronal plus glial cultures grown on Silastic membranes were subjected to mild, moderate, and severe stretch. After injury, delta(psi)m was measured using rhodamine-123, and ATP was quantified with a luciferin-luciferase assay. In astrocytes, delta(psi)m dropped significantly, and ATP content declined 43-52% 15 min after mild or moderate stretch but recovered by 24 h. In pure neurons, delta(psi)m declined at 15 min only in the severely stretched group. At 48 h postinjury, delta(psi)m remained decreased in severely stretched neurons and dropped in moderately stretched neurons. Intracellular ATP content did not change in any group of injured pure neurons. We also found that astrocytes and neurons release ATP extracellularly following injury. In contrast to pure neurons, delta(psi)m in neurons of mixed neuronal plus glial cultures declined 15 min after mild, moderate, or severe stretch and recovered by 24-48 h. ATP content in mixed cultures declined 22-28% after mild to severe stretch with recovery by 24 h. Our findings demonstrate that injury causes mitochondrial dysfunction in astrocytes and suggest that astrocyte injury alters mitochondrial function in local neurons.

Adenosine Triphosphate↗
PubMed1999

Is spinal anaesthesia safe in pre-eclamptic toxaemia patients?

Thirty-three patients of pre-eclamptic toxaemia underwent caesarean section (CS) under general anaesthesia (n = 16) and spinal anaesthesia (n = 17). The Apgar score at 1, 5 and 10 minutes of the babies following spinal anaesthesia (SA) were only marginally better than that of general anaesthesia (GA; P > 0.05). The incidence of complication following GA (68.8%) were significantly (P < 0.05) more than that of SA (47.1%). Commonest complications following GA were intra-operative hypertension (68.8%) followed by difficult intubation (25%), pulmonary oedema (12.8%), delayed recovery (12.8%) and mortality (4.3%). While following SA complications were intra-operative hypotension (47.1%), difficult SA (29.4%) and intra-operative vomiting (5.9%). The nature of complications following GA were more serious which may even lead to mortality (4.3%), whereas following SA it was less serious and easily manageable. Hence SA is not as unsafe as it is thought.

Anesthesia, General↗
PubMed1998

Management of dyslipidemia in adults.

The importance of treating dyslipidemias based on cardiovascular risk factors is highlighted by the National Cholesterol Education Program guidelines. The first step in evaluation is to exclude secondary causes of hyperlipidemia. Assessment of the patient's risk for coronary heart disease helps determine which treatment should be initiated and how often lipid analysis should be performed. For primary prevention of coronary heart disease, the treatment goal is to achieve a low-density lipoprotein (LDL) cholesterol level of less than 160 mg per dL (4.15 mmol per L) in patients with only one risk factor. The target LDL level in patients with two or more risk factors is 130 mg per dL (3.35 mmol per L) or less. For patients with documented coronary heart disease, the LDL cholesterol level should be reduced to less than 100 mg per dL (2.60 mmol per L). A step II diet, in which the total fat content is less than 30 percent of total calories and saturated fat is 8 to 10 percent of total calories, may help reduce LDL cholesterol levels to the target range in some patients. A high-fiber diet is also therapeutic. The most commonly used options for pharmacologic treatment of dyslipidemia include bile acid-binding resins, HMG-CoA reductase inhibitors, nicotinic acid and fibric acid derivatives. Other possibilities in selected cases are estrogen replacement therapy, plasmapheresis and even surgery in severe, refractory cases.

Adult↗
PubMed1998

Evaluation and treatment of urinary tract infections in children.

Urinary tract infections (UTIs) are among the most common bacterial infections encountered by primary care physicians. Although UTIs do not occur with as great a frequency in children as in adults, they can be a source of significant morbidity in children. For reasons that are not yet completely understood, a minority of UTIs in children progress to renal scarring, hypertension and renal insufficiency. Clinical presentation of UTI in children may be nonspecific, and the appropriateness of certain diagnostic tests remains controversial. The diagnostic work-up should be tailored to uncover functional and structural abnormalities such as dysfunctional voiding, vesicoureteral reflux and obstructive uropathy. A more aggressive work-up, including renal cortical scintigraphy, ultrasound and voiding cystourethrography, is recommended for patients at greater risk for pyelonephritis and renal scarring, including infants less than one year of age and all children who have systemic signs of infection concomitant with a UTI. Antibiotic prophylaxis is used in patients with reflux or recurrent UTI who are at greater risk for subsequent infections and complications.

Child↗
PubMed1998

Chronic energy deficiency in women from rural Bangladesh: some socioeconomic determinants.

This paper explores a number of socioeconomic factors thought to explain the wide prevalence of undernutrition among rural Bangladeshi women. The 1992 baseline survey data of the BRAC-ICDDR,B Joint Research Project at Matlab were used. Anthropometry was performed on a random sub-sample of 1462 currently married, non-pregnant women between 15 and 49 years of age. Women's nutritional status was defined in terms of Body Mass Index (BMI = wt in kg/ht in m2). Compared with women from better-off households, the mean weight (41.2 vs 43.0 kg; p < 0.0001), mid-upper arm circumference (MUAC) (22.1 vs 22.7; p < 0.0001), and BMI (18.5 vs 19.1; p < 0.0001) of poor women were consistently lower. However, no significant difference in mean height was found between the two groups. The results showed that women aged more than 35 years are twice as likely to have a BMI < 18.5 compared with younger women. Both years of schooling received and socioeconomic status are found to be important predictors of women's BMI. Women who have received one or more years of formal education are nearly half as likely to suffer chronic energy deficiency (BMI < 18.5) than women with no schooling. Again, better-off women are found to be 0.77 times less likely to have chronic energy deficiency than women from poor households. The implications of these findings in improving the nutritional status of rural Bangladeshi women are discussed.

Adolescent↗
PubMed1998

An alternative method for dealing with cerebrospinal fluid fistulae in inner ear deformities.

OBJECTIVE: This study aimed to review the management of cerebrospinal fluid (CSF) fistulae in the setting of developmental inner ear deformity. STUDY DESIGN: The study design was a case review, close examination of preoperative radiology, and corresponding intraoperative images. TECHNIQUE: A definitive method of CSF fistula closure is described using previously known techniques used commonly in skull base surgery. CONCLUSIONS: The use of a multiple-level, reinforced wound closure technique is necessary to definitively close CSF fistulae in extreme inner ear deformity and to prevent further episodes of CSF leak and meningitis.

Audiometry, Pure-Tone↗
PubMed1997

A method for assigning authorship in multiauthored publications.

BACKGROUND AND OBJECTIVES: Determining authorship for publications is often a difficult process, even more so when individuals from several disciplines collaborate with community organizations to conduct projects. Although multidisciplinary and community-academic partnerships provide fertile ground for publication efforts, disputes about authorship and ownership of data may hinder efforts to disseminate information. This article describes a process for dealing with authorship in multi-professional collaborations. It provides an authorship scale, similar to a neonatal Apgar scale, to determine order of authorship in multi-professional projects. Key components or activities in the process of authorship are identified, and points are assigned to each component in proportion to an investigator's level of activity in each component/activity. Scores are summed and can range from 1 to 35 for each author. The order of authorship is then determined by the relative score of each participant.

Authorship↗
PubMed1997

Intra-operative suggestions reduce incidence of post hysterectomy emesis.

The influence of therapeutic intraoperative auditory suggestions on the incidence and severity of emetic episodes was investigated in 50 adults ASA I and II patients undergoing elective abdominal hysterectomy. The patients were randomly divided into two groups, each consisting of 25 patients. In group I, a blank tape was played and in group II, positive suggestion was played via headphones throughout the anaesthetic period. It was observed that there was statistically significant difference (P < 0.05) between the incidence of vomiting in group I (60%) and group II (36%). The number of vomiting episodes per patient in group I was 3.1 +/- 1.2 as compared to 1.7 +/- 0.6 in group II. This difference was statistically significant. The patients requiring rescue antiemetic was significantly higher (P < 0.05) in group I (66.6%) as compared to group II (22.2%). It is concluded that positive therapeutic suggestion may be considered as an alternative to antiemetic therapy.

Adult↗
PubMed1997

Lansoprazole potentiates vecuronium paralysis.

The effect of lansoprazole, a newer second generation proton pump inhibitor, on vecuronium induced muscle paralysis was evaluated. Fifty adult patients comprising grade I (normal healthy patient) and grade II (patient with a mild systemic disease) as classified by the American Society of Anesthesiologists were randomly allocated into two different groups each consisting of 25 patients. Group I (control) did not receive lansoprazole and group II (study) received 30 mg lansoprazole in the night before operation. There was no statistically significant difference (p > 0.05) in the time required for complete paralysis between group I (215.7 +/- 15.19 seconds) and group II (197.5 +/- 14.13 seconds). However, the duration of paralysis was significantly different (p < 0.05) between group I (32.7 +/- 8.7 minutes) and group II (43.9 +/- 9.3 minutes). It was concluded that there is a potential for interactions and one should carefully and closely monitor the patients to prevent prolonged paralysis in patients receiving lansoprazole, as a pre-anaesthetic medication.

2-Pyridinylmethylsulfinylbenzimidazoles↗