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Biomedical subjects

M M Singh

Publications and source records attributed to M M Singh.

At least 127 records · Page 7Linked to original sources

A study of disseminated intravascular coagulopathy in hepatic coma complicating acute viral hepatitis.

Thirty cases of viral hepatitis with and without coma and 15 normal healthy age and sex matched controls were studied for disseminated intravascular coagulopathy (DIC). Cases of viral hepatitis with coma showed strong evidence of DIC in the form of increased plasma FDP (240 +/- 190.64 dilution), diminished fibrinogen half life (48.1 +/- 15.3 hours) and increased fractional catabolic rate (46.13 +/- 14.7% per day) with normal Euglobulin clot lysis time and reduced fibrinogen (147.33 +/- 43.5%) and platelet count (1.27 +/- 0.324 lakhs/cm.). The possible role of heparin in the reversal of coagulation abnormalities have been discussed.

Adult↗

Viability and development of 'tube-locked' mouse embryos.

'Tube-locked' morulae and blastocysts were recovered from the ampulla of the oviduct of centchroman-treated mice between Days 4 and 12 post coitum and transferred to the uteri of pseudopregnant female mice. Pregnancy and implantation rates were lower and the post-implantation resorption rate was higher in the treated than in the control group. There was little difference in the pregnancy or implantation rates between embryos recovered on Days 4 or 12 post coitum, but the resorption rate increased with increasing duration of embryos in the oviducts and was 100% for the Day-12 embryos. The resorption rate was similar even when these embryos were transferred to the sterile uterine horn of unilaterally pregnant mice. Centchroman did not produce any deleterious effect on embryos which survived until Day 19 of pregnancy in foster mothers. The average fetal weight was also comparable to those of control fetuses.

Animals↗

Diazepam-induced changes in tardive dyskinesia: suggestions for a new conceptual model.

Using an ABA' research design, the effects of a benzodiazepine gamma-aminobutyric acid (GABA)-ergic agent, diazepam, on various aspects of tardive dyskinesia (TD) were investigated in 21 patients. Videotaped recordings of the examinations were rated blind on the Abnormal Involuntary Movements Scale. In nonsedating amounts, diazepam had a significant anti-TD effect, especially in terms of limb dyskinesia. A significant portion of the therapeutic effect persisted after the medication was withdrawn. The results suggest that diazepam has a specific anti-TD action and that in some cases it may be able to produce a somewhat lasting correction of the deranged neurobiological mechanisms in TD. Since the main sites of action of benzodiazepines and the highest concentrations of benzodiazepine-linked GABA receptors are in the limbic and cortical structures that provide principal sources of inputs to the basal ganglia, it is suggested that the supra-striato-pallidal mechanisms of voluntary movement control should be considered in understanding the pathogenesis and treatment of TD.

Adult↗

Aggression control and structuring of social relations among recently admitted schizophrenics.

As part of a study using an ethological conceptual approach, three scales were constructed to reflect adaptive success in the structuring of social relations. Twenty recently admitted schizophrenics were studied longitudinally in an active therapeutic milieu, drug-free, and during neuroleptic treatment. Patients showed substantial failures in the ritualization of agonistic behavior, manifest in more overt flight and fight. Poor group integration and absence of bond formation characterized the sample and were correlated with social withdrawal and elevated resting pulse rate--a pattern highly reminiscent of that seen in monkeys after bilateral amygdalectomy. The paranoid subgroup was the least impaired. Four-month long intensive treatment, including neuroleptics and psychosocial therapies, produced significant but modest improvements. Considerable maladaptive functioning remained.

Adaptation, Psychological↗

Territorial behavior of schizophrenics. A phylogenetic approach.

Utilizing Tinbergen's concept of increasing phenotypic adjustability on the evolutionary scale leading to man and the ethological concept of territoriality, five Territorial Behavior Scales were designed to reflect increasing levels of adaptive behavior in humans. Twenty recently admitted schizophrenics were studied in an active therapeutic milieu during 2 drug-free weeks, followed by 14 weeks of neuroleptic treatment. Four trained raters scored each patient weekly from 0 to 3 on each scale. Ward nursing staff independently rated social behavior and obtained measures reflecting psychomotor activation and autonomic arousal. Two major types of maladaptive behaviors were identified. The first, involving a breakdown of the ability to make any territorial distinctions in structuring social relationships, correlated directly with psychomotor activation as well as autonomic arousal and was a labile, i.e., treatment-responsive, behavior. The second, involving restrictive territoriality in which the individual occupies physical space to the exclusion of social interactions with others, was unrelated to autonomic arousal but correlated inversely with psychomotor activation and was a stable, i.e., treatment-resistant, behavior. Restrictive territoriality most characterized the total group throughout the study. Adaptive territorial behaviors expected in healthy humans were rare. Following treatment, hebephrenics showed the least favorable overall territorial profile. Untreated catatonics showed the highest levels of undifferentiated or chaotic territorial behavior, but with treatment their profile approached that of the paranoids, who were the least impaired. The data support the concept that two distinct pathological processes are involved in schizophrenia and that the three diagnostic subtypes of this syndrome are meaningful clinicopathological entities.

Adult↗

Levamisole as an adjunct in the treatment of pulmonary tuberculosis.

An immunomodulatory drug levamisole (l-tetramisole) was used in the treatment of 50 patients with newly diagnosed sputum-positive pulmonary tuberculosis in addition to routine chemotherapy. A control group received routine chemotherapy for tuberculosis only. Patients in both groups had been chosen because of mild immunodepression, as shown by their insensitivity to skin tests with dinitrochlorobenzene (DNCB). The patients were followed for 3 months, and their clinical recovery was assessed and compared by recording the rate of sputum clearance, rate of weight gain, decrease in erythrocyte sedimentation rate (ESR), and clearance of radiologic lesions. The results showed that at the end of 3 months, 48% of the patients in the group receiving levamisole reacted to DNCB as against only 18% of the control group. The levamisole-treated group also showed significant radiologic clearing compared with the control group. However, the rate of sputum clearance, decrease in ESR, and weight gain did not show any significant difference.

Adolescent↗

Semen characteristics and fertility of rabbits subjected to exhaustive use.

Up to 26 ejaculations were obtained from male rabbits within a period of 8 hours. During the next 20 days, further ejaculates were collected to establish the pattern of restoration of normal values. Repeated ejaculation resulted in a marked and progressive decline in the 3 semen characters examined; sperm density returned only slowly (3 weeks) to the initial level whereas fructose and volume, in particular, responded much faster. No significant effect of ejaculate order on fertility, litter size or sex ratio was demonstrated.

Animals↗

Estrogenic and antiestrogenic activities of two new nonsteroidal antifertility agents.

Compounds E696 and E785 (Alkanoic acid derivatives) prevented pregnancy in rats following a single oral administration on day 1 post coitum. Both the compounds were found to possess potent estrogenic activity as revealed by increased uterine weight, premature opening of vagina and cornification of the vaginal epithelium in immature rats. In adult rats, the two compounds induced implantation of delayed blastocysts. Mild estrogenic response was discerned even 21 days after a single oral administration of each of these compounds to immature animals. However, neither of these compounds exhibited any estrogen antagonistic or synergistic property. The contraceptive and estrogenic activities of these compounds have been compared to ethinyl estradiol.

Animals↗