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Biomedical subjects

R Singh

Publications and source records attributed to R Singh.

At least 577 records · Page 32Linked to original sources
PubMed1988

Changes in radicular function following low-back surgery.

Results of neurological assessment 1 year following surgical treatment of herniated lumbar intervertebral discs and lumbar stenosis are reported in 443 patients. The data were collected using separate series of questionnaires to be completed by the patient and the surgeon. Preoperatively, motor loss was reported by 12% of patients, while surgeons found motor weakness in 28%. Postoperative motor loss was still present in 24% and 25% of these cases, respectively; the operation had caused or aggravated motor loss in 5% and 3% of cases, respectively. Sensory phenomena were reported by 53% of the patients, while surgeons found sensory loss in 45%. Sensation was reported as abnormal 1 year after surgery both by patients and by surgeons in one-third of these cases. Sensory loss, considered by the patient to be caused or aggravated by operation, occurred in 15% of cases and in 12% of cases the surgeons agreed. Preoperatively, unilaterally diminished knee and Achilles tendon reflexes were found in 9% and 42%, respectively; at 1 year after surgery, these had recovered in 65% and 57% of cases, respectively. Surgery caused or aggravated unilaterally diminished knee or ankle jerks in 3% and 10% of cases, respectively.

Humans↗
PubMed1988

The spectrum of hepatic injury in enteric fever.

Thirty six patients with culture-proven enteric fever and 15 patients of fever with etiology other than enteric fever as a control group were studied, with special reference to hepatic dysfunction and its relation to clinical features of the disease. Hepatomegaly was observed in 55% of enteric fever patients, and was slightly more common than splenomegaly (50%). Its incidence in typhoid fever (67%) was three times higher than in paratyphoid fever (22%). Hepatic dysfunction occurred in 55% of cases. Jaundice was noted in only 8% of the cases, whereas hyperbilirubinemia (serum bilirubin greater than 1.8 mg %) was present in 17%. Although hepatic manifestations of enteric fever were mild, a small but important group had sufficient hepatic involvement to mimick the clinical picture seen in viral hepatitis, amebic liver disease, and malaria with jaundice. It may be considered of clinical significance, since enteric hepatitis responds very well to specific therapy.

Adolescent↗
PubMed1988

Long QT syndrome.

Explore the source record for details and available documents.

Arrhythmias, Cardiac↗
PubMed1987

Central cardiovascular effects of baclofen in spontaneously hypertensive rats.

This study was conducted to investigate the effects of centrally administered baclofen on blood pressure and heart rate in conscious spontaneously hypertensive (SHR) and normotensive Wistar-Kyoto (WKY) rats. Administration of baclofen (1.0 microgram/kg) into the lateral cerebral ventricle (icv) produced an increase in mean arterial pressure (MAP) in both SHR and WKY rats. The increase in MAP was significantly lower in SHR (13 +/- 3 mmHg) when compared with WKY (27 +/- 5 mmHg). The changes in heart rate (HR) were variable, from no change to a very small increase and did not differ significantly between SHR and WKY rats. The ability of baclofen to interfere with baroreceptor reflexes was also tested in separate experiments. In SHR, icv injection of baclofen (1.0 microgram/kg) significantly suppressed the pressor response and bradycardia evoked by phenylephrine 3.0 micrograms/kg iv, whereas in WKY, the pressor and HR responses to similar injections of phenylephrine were not affected by icv baclofen. Similarly, baclofen treatment modified hypotensive response and reflex tachycardia induced by nitroprusside (10.0 micrograms/kg) iv in SHR but not in WKY rats. Administration of sympathetic ganglionic blocker hexamethonium (HEX; 25 mg/kg) iv produced an equivalent decrease in MAP between SHR and WKY following icv injection of baclofen (1.0 microgram/kg). These results suggest that the effects of baclofen on the baroreceptor reflexes in SHR may not be mediated by a change in peripheral sympathetic tone.

Animals↗
PubMed1987

A new protein (J1-31 antigen, 30 kD) is expressed by astrocytes, Müller glia and ependyma.

Monoclonal antibody (MAb) J1-31 raised using human brain homogenate as immunogen in mice can be used as a cell type marker for certain types of CNS macroglia, namely astrocytes, Müller cells and tanycytes as well as ciliated ependymal cells. Except for the ciliated ependymal cells, these types of macroglia express glial fibrillary acidic protein (GFAP). J1-31 antigen is an intracellular protein which has a MW of 30 kD under reducing conditions for gel electrophoresis (Singh et al., 1986). This protein is distinct from GFAP (MW 50 kD) and vimentin (MW 55 kD), the two core proteins of 10 nm IFs known to be expressed in the above types of macroglia. This conclusion is based on several criteria including temporal differences in the onset of expression of GFAP and J1-31 antigen during development of the rat cerebellum. Also, there is no detectable (by immunofluorescence microscopy) expression of J1-31 antigen in the prenatal CNS or outside the CNS where vimentin has been reported to be abundant. The most direct evidence that J1-31 antigen and GFAP are distinct proteins comes from studies on the mature ciliated ependymal cells which do not express GFAP and yet show intense immunostaining for J1-31 antigen.

Animals↗
PubMed1987

Experience of a family clinic at Benghazi, Libya, and sociomedical aspects of its catchment population.

The article highlights the pioneering efforts towards establishment of a family clinic as a model for provision of primary health care to the community at family level in Libya. Home visits were undertaken by health teams to introduce the clinic and record demographic and sociomedical data. Families were invited to attend the clinic for a complete health examination. It was largely a young population with an average family size of 7.1. The houses were generally overcrowded. The majority of the heads of families had no formal education or skilled occupation but 98.1% had gainful employment. The vital statistics of the population, though comparable to the national figures, reflect a better health status. The infant mortality rate of the reference population was 25.9 per 1000 live births compared with 32.8 for the whole of Libya. Most reproductive age women (81.5%) breast fed their children for six months or more and 4% used contraceptives. The overall morbidity rate was 255 per 1000 population and the morbidity pattern, with a predominance of infections, was typical of a developing country. Each case diagnosed during the survey was appropriately treated and those with chronic diseases are being followed up. It is felt that such family based comprehensive health care units will go a long way in providing primary health care throughout Libya.

Adolescent↗
PubMed1987

Extrapulmonary localization of gallium in sarcoidosis.

This paper describes the spectrum of extrapulmonary localization of gallium in patients with sarcoidosis. The usefulness of Ga-67 scintiscans in detecting clinically occult lesions, in directing clinicians to accessible sites for biopsy, and in following the course of extrapulmonary sites of involvement with therapy is emphasized.

Bone Diseases↗