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Biomedical subjects

S Mehta

Publications and source records attributed to S Mehta.

At least 451 records · Page 25Linked to original sources
PubMed1979

Presence of elevated circulating levels of LH during the pre-menstrual period in some copper IUD users and the possibility of their confusion with hCG.

A heterologous radioimmunoassay (RIA) capable of discriminating between LH and hCG was used to measure LH levels in sera obtained during the pre- and post-menstrual periods from 80 women bearing copper intrauterine contraceptive devices (IUD). hCG levels in these samples were also estimated by use of a homologous beta-hCG radioimmunoassay and a radioligand-receptor assay. Only two IUD users during the pre-menstrual period had detectable, but low hCG levels. However, LH levels, as estimated by specific RIA, in the serum of these two women were elevated to a level that would cause detection at low levels in the hCG assays. The data thus provide direct evidence to indicate that the positive hCG levels observed by others during the pre-menstrual period in some copper IUD users could be due to the interference in hCG assays by elevated LH.

Adult↗
PubMed1979

Kala-azar in north-western India: a study of 24 patients.

Twenty-four sporadic cases of kala-azar diagnosed over an 11-year period in a referral medical centre in north-western India are reported. Most of the patients were residents of non-endemic areas or where endemicity was low. Certain unusual clinical and laboratory features were seen in some of the cases, namely, lymphadenopathy, nasopharyngeal growth, acute and chronic hepatic involvement and portal hypertension. Awareness of the occurrence of the disease and of its protean modes of presentation was found to be an important factor in early diagnosis.

Adolescent↗
PubMed1979

Ventricular septal defect in infancy: a combined vectorgraphic and echocardiographic study.

Echocardiograms (echo) and vectorcardiograms (VCG) from 40 infants with ventricular septal defects (VSD) were compared with cardiac catheterization data to assess noninvasively the hemodynamics of VSD. The specific aim was to use VCG parameters of right ventricular hypertrophy and echo parameters which reflect pulmonary artery pressure to identify all patients with a nonrestrictive VSD. The configuration of the QRS vector in the horizontal plane was more reliable than individual voltages in assessing right ventricular systolic pressure. Among patients older than 2 months with a clockwise or anterior two-main-vector horizontal loop, 73% (eight of 11) had a nonrestrictive VSD. However, a counterclockwise or posterior two-main-vector loop was also frequently found (43%, six of 14) in infants with a nonrestrictive VSD. The most useful echo parameter was the ratio of right ventricular preejection period-to-right ventricular ejection time (RPEP/RVET), which closely (r = 0.74) reflected the pulmonary artery diastolic pressure. An elevated RPEP/RVET to greater than 0.30 was always associated with a nonrestrictive VSD, although many patients (36%, five of 14) with a nonrestrictive VSD had a normal ratio. By combining both echo and VCG parameters, a nonrestrictive VSD was correctly identified in all patients, while a restrictive VSD was correctly identified in 81% (21 of 26).

Cardiac Catheterization↗
PubMed1979

Echocardiographic estimation of ventricular hypoplasia in complete atrioventricular canal.

Echocardiograms from 10 patients with complete atrioventricular canal (CAVC) were compared with autopsy specimens to determine the capabilities of echocardiography in identifying patients with ventricular hypoplasia. On the basis of echographic ventricular size, patients could be divided into three groups: 1) "balanced" CAVC patients had both increased right and left ventricular end-diastolic dimensions (RVED and LVED) and an increased RVED/LVED ratio; 2) "dominant left ventricular" CAVC patients had an increased LVED and small or normal RVED and a diminished RVED/LVED ratio; 3) "dominant right ventricular" CAVC patients had an increased RVED, but small LVED, and increased RVED/LVED. There was complete agreement between echographic ventricular dominance and pathologic findings. This study demonstrates that echocardiography may be valuable in assessing ventricular dominance in the presence of CAVC.

Child, Preschool↗
PubMed1979

The syndrome of inappropriate secretion of antidiuretic hormone (SIADH): an overview.

We have reviewed 14 cases of water intoxication in psychiatric patients. In these cases the possibility of the syndrome of inappropriate antidiuretic hormone secretion (SIADH) was suspected or diagnosed. The SIADH should be suspected in psychotic patients who drink water excessively, develop seizures, disorientation and deterioration of mental status.

Adult↗
PubMed1979

Primate model of sprue-like syndrome.

An experimental model resembling so-called tropical sprue has been produced in young, growing rhesus monkeys kept on a protein-deficient diet. At a 2% level of protein intake, the animals became frankly diseased after two months, but at a 5% protein intake the symptoms appeared after five months. The animals lost weight, their skin became brittle, the fur lost luster, and facial edema appeared. The hematocrit, and serum folate, protein and albumin were significantly decreased, and intestinal absorption of fat, D-xylose, radioactive vitamin B12 and folic acid showed marked depression. The jejunal mucosa showed moderate villous atrophy. Histochemical and electron microscopy changes were consistent with those seen in the human tropical sprue syndrome. It appears, therefore, that protein malnutrition plays an important role in the experimental tropical-sprue-like syndrome in monkeys.

Animals↗
PubMed1979

Low dose steroid from the day following renal transplantation.

Azathioprine combined with a low dose of steroid (20mg of prednisolone) commencing the day following transplantation has been used for immunosuppression for 151 consecutive renal transplants in 141 patients (146 cadaver grafts, 5 living related donor grafts). Immunosuppression was satisfactory as 109 grafts function from 6 months to 10 years, 17 of 42 grafts lost failed from rejection. No patient died from infection before 90 days, 4 died later from infection, 2 associated with anti-rejection therapy. Seven patients developed gastrointestinal complications, 1 died; 4 developed diabetes, all survived; only 1 patient developed avascular necrosis of bone.

Adolescent↗
PubMed1978

Effect of amino-oxyacetic acid (AOAA) on focal penicillin seizures.

The biochemical and behavioral effects of the anticonvulsant amino-oxyacetic acid (AOAA) have been studied in a model of focal penicillin seizures in rats. At 20 mg/Kg AOAA treatment results in a progressive 11 fold increase in GABA levels in cortex over three hours. There is a decrease in aspartate, ketoglutarate, alanine and glutamine, and an initial decrease followed by an increase in pyruvate and glutamate. These results reflect a functional inhibition of several B-6 dependent aminotransferase enzymes. When rats are pretreated 30 min before the onset of focal penicillin seizures there is a 60% reduction in the number of discharges and a 34% reduction in seizure duration. Pretreatment beyond 75 min results in progressively less anticonvulsant effect, such that seizures eventually become more severe than control. There is an increase in the number and duration of discharges, seizure spikes become complex, and tonic-clonic events develop. Penicillin seizures do not cause a change in levels of GABA, but result in a decrease in glutamate within the focus. AOAA pretreatment initially prevents this decrease in glutamate but later accentuates it. The biochemical effects of AOAA are complex, but biphasic anticonvulsant properties coincide in time with a change in the balance of excitatory and inhibitory amino acids in the seizure focus.

Acetates↗
PubMed1978

Monitoring of occupational exposure to nitrous oxide.

The occupational exposure of operating room personnel to nitrous oxide was investigated by using multiple spot sampling, integrated personal sampling and end-tidal sampling in an operating room which had no ventilation system. The effect of passive scavenging on occupational exposure was determined. The study showed that all three methods to determine occupational exposure can yield representative time-weighted exposure patterns. However, the integrated personal sampling was considered the preferable method as it involved considerable saving of time and labour compared with taking and analyzing multiple end-tidal and spot samples. Passive scavenging of waste anaesthetic gases led to a three-fold to six-fold reduction of exposure of operating room personnel to nitrous oxide.

Air Pollutants↗
PubMed1978

Suicide pact in a depressed elderly couple: case report.

An elderly depressed couple with multiple physical problems decided that death was preferable to their present lifestyle, and made a suicide pact. At the last minute the wife felt unable to go through with it and the couple entered a psychiartic hosptial. During their 3-week stay they were treated appropriately with amitriptyline and psychotherapy. Since discharge they have been followed closely for two years. Some psycho- and socio-dynamic and therapeutic aspects are discussed.

Adjustment Disorders↗
PubMed1978

Unusual abdominal complications of a suicidal overdose of analgesic and psychotropic drugs in an elderly patient.

A suicidal 67-year-old woman with manic-depressive psychosis took an overdose of asprin, amitriptyline and diazepam. The initial effects were pyrexia, tachycardia, hyperpnea, metabolic acidosis, electrocardiographic changes, hypoprothrombinemia, gastritis, and pancreatitis. Four to six weeks later, she was examined because of persistent abdominal pain with mausea, anorexia anemia, and possibly a malabsorption syndrome. An exploratory laparotomy was performed. The surgeon found several previous adhesions, a small intestinal volvulus, and a nodular pancreas. This suggested previous perforation of the small bowel from enteritis, causing a "blind-loop" syndrone. The invilved section of the small bowel was resected. With appropriate treatment, the patient is well three months after operation.

Aged↗
PubMed1978

Primary empty sella syndrome and bipolar affective illness: case report.

This report concerns an elderly woman with primary empty sella syndrome and bipolar affective illness. She had no endocrine, visual, or neurologic dysfunction and had received electroconvulsive therapy with no long-term adverse effects. Remission of the affective illness has been maintained for five years with lithium carbonate therapy.

Aged↗