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Biomedical subjects

P K Mohan

Publications and source records attributed to P K Mohan.

At least 19 recordsLinked to original sources
PubMed1995

Prolonged brainstem auditory evoked potential latencies in tropical pancreatic diabetics with normal hearing.

Twenty patients with Tropical Pancreatic Diabetes (TPD) were evaluated by Brainstem Auditory Evoked Potentials (BAEP) in order to detect any possible subclinical involvement of auditory pathways. The latencies of BAEP Wave III (p < 0.009) and V (p < 0.47) as well as the Interpeak Latencies I-III (p < 0.002), and I-V (p < 0.019) were significantly prolonged in patients with TPD when compared to age and sex matched healthy volunteers. There was correlation between the abnormalities of BAEP and duration of diabetes (p < 0.006), male sex of patients (p < 0.05), and the presence of retinopathy (p < 0.003) and nephropathy (p < 0.38). There was no significant correlation with the age of the patients, type of treatment, blood sugar levels and presence of peripheral neuropathy. These changes suggest a subclinical involvement of the auditory pathways in TDP patients.

Adult↗
PubMed1994

Mycotic aneurysms of the intracranial vessels.

The salient clinical and pathological features are reported of Aspergillus cerebral aneurysms in four young women who had undergone intra-abdominal surgery under spinal anaesthesia and developed clinical features of meningitis 7-16 days postoperatively. The circle of Willis showed ruptured aneurysm in the basilar artery and its branches. The role of iatrogenic factors in the pathogenesis of Aspergillus cerebral aneurysms is highlighted.

Abdomen↗
PubMed1994

Necrotizing myelopathy--a report of two cases with review of literature.

Necrotizing myelopathy is an uncommon neurological disorder. Till 1991, only 31 cases have been described in the literature. In this report, clinical and neuropathological features in two patients with necrotizing myelopathy are described. The precise aetiological agent in first patient was undetermined, However in the second patient there was serological evidence, suggestive of Herpes simplex virus infection.

Antibodies, Viral↗
PubMed1994

Diagnosis of tuberculous meningitis by enzyme-linked immuno-sorbent assay (ELISA), using an affinity chromatography purified mycobacterial antigen.

Using an immunoabsorbent affinity chromatography, a mycobacterial antigen was isolated from culture filtrate of H37Ra Mycobacterium tuberculosis (MTB). The immunoabsorbents were prepared by coupling cynogen bromide-activated Sepharose-4B with human IgG antibody to MTB. Cerebrospinal fluids (CSF) from 10 culture positive, 30 culture negative patients with tuberculous meningitis (TBM) were assayed, for IgG antibody to this mycobacterial antigen by ELISA. CSFs from 50 patients with non-tuberculous neurological diseases were selected as control group. At a selected 'cut off' titre of 1:80, 21 out of 30 CSFs from culture negative patients gave positive results. No false negative result was observed in CSF from 10 culture positive patients with TBM. No false positive results were recorded in CSFs of 50 patients with non-tuberculous neurological diseases. Technical aspects involved in the isolation of this myobacterial antigen and its potential applications in the laboratory diagnosis of TBM have been emphasised in this study.

Antibodies, Bacterial↗
PubMed1994

Disseminated intra-cerebral microabscesses: a clinico-pathologic study.

In this retrospective study, clinical and neuropathological features were analysed in eight patients with disseminated intracerebral microabscesses. All the patients presented with clinical features, suggestive of an encephalopathic process of an acute onset. Neuroradiological and laboratory investigations were not helpful in establishing the diagnosis in any patient during their hospital stay. All the eight patients died in the hospital and at autopsy disseminated intracerebral microabscesses were the most striking feature. In two patients hyphae of Candida albicans were demonstrated within the microabscesses. Gram negative bacilli in two patients and gram positive and gram positive cocci in one patient were demonstrated in the microabscesses. Disseminated intra-cerebral microabscesses are usually an unrecognised manifestation of central nervous system infections and should be considered in the differential diagnosis of patients with encephalopathy of unknown aetiology.

Adult↗
PubMed1993

Visual evoked potential changes in patients with tropical pancreatic diabetes.

Visual impairment is an important complication of diabetes. There are conflicting reports on Visual Evoked Potential (VEP) changes in diabetes. P100 latency of VEP was evaluated in twenty patients with Tropical Pancreatic Diabetes (TPD) and compared with that of age and sex matched controls. There was no statistically significant difference in the P100 latency between the two groups. There was no correlation between the P100 latency and the severity of diabetes or presence of defective vision or retinopathy. The defective vision in diabetes is likely to be due to ocular causes rather than due to a defect in the central visual pathways.

Adult↗
PubMed1991

Syringohydromyelia: radiological evaluation of 82 patients in a developing country.

A series of 82 patients presenting with syringohydromyelia and confirmed at operation were studied by conventional radiological techniques and computed tomography (CT). Cord collapse was demonstrated in 71% of the patients with wide bony canals and only 11% of patients with normal bony canals. It was most reliably shown with high resolution CT. Intrathecal CT metrizamide myelography (CTMM) failed to demonstrate contrast percolation into many cavities shown in the plain scans. Obliteration of the subarachnoid space at C1-2 levels appreciated in the plain scans strongly indicated coexisting tonsillar herniation, making CTMM unnecessary. In almost all patients, CTMM was found to be non-contributory if the high resolution plain CT scan failed to reveal cord cavitation.

Adolescent↗
PubMed1990

ELISA of IgG antibody to Mycobacterium tuberculosis antigen-5, PPD in CSF in tuberculous meningitis patients.

IgG antibody to M. tuberculosis antigen-5 and tuberculin purified protein derivative (PPD) was measured by enzyme linked immunosorbent assay (ELISA) in cerebrospinal fluid (CSF) specimens of 55 patients with tuberculous meningitis (TBM) and 55 patients with non-tuberculous neurological diseases (control group). The geometric mean antibody titre in CSF specimens of TBM patients was 82.4 with antigen-5 and 96.5 with PPD. In the control group, the geometric mean antibody titres for these antigens in CSF specimens were 4.6 and 10.8 respectively. The antibody titres did not show any correlation with tuberculin reactor status, duration of chemotherapy and IgG levels in CSF specimens in patients with TBM. At dilution end point 1:80, specificity of the assay was 100 per cent with antigen-5 and sensitivity of the assay was 70.9 per cent. False positivity observed in the control group with PPD antigen could be eliminated in 1:80 dilution in the assay with antigen-5. Antigen-5 is more specific than PPD antigen for the diagnosis of tuberculous meningitis.

Antibodies, Bacterial↗
PubMed1987

Ambient ammonia effect on catalytic potential of muscle and gill AMP deaminase in fish.

AMP deaminase activity was inhibited in gill and muscle of Sarotherodon mossambicus, subjected to a week-long exposure to sublethal concentration of ambient ammonia. pH-dependent kinetic studies revealed decreased catalytic efficiency of the enzyme due to altered active site density and ionization pattern in the fish tissues at different phases of ammonia exposure.

AMP Deaminase↗
PubMed1987

Age-related changes in muscle ammonia detoxification potential in exhausted rats.

The changes in the pattern of production and detoxification of ammonia have been studied in the skeletal muscles and blood of rats of different age groups (1, 3, 6, 12 and 24 months), subjected to exhaustive exercise. The protein profiles at exhaustion showed a sharp drop in all muscles and the decrement was more in the senile rats. In general, the muscle and blood ammonia content increased with age with a corresponding increase in AMP deaminase activity implicating the possibility of elevated purine nucleotide deamination during senescence. However, glutamate oxidation was decreased and urea and glutamine formation was increased consequent to ammonia production during senescence under intensive physical stress. The possible alterations in protein levels and ammonia production and its disposal in different skeletal muscle types of senile exhausted rats have been discussed in relation to detoxication capacity of the fibre types.

AMP Deaminase↗
PubMed1987

Pharmacokinetics of Bevidox in functionally different muscles of albino rat during prolonged intense activity.

Intramuscular Bevidox treatment for five days influenced the metabolic status and functional efficiency of the different types of muscles in rat during exhaustion. Glycogen and protein depletion observed during exhaustion was alleviated by Bevidox treatment to a greater extent in cardiac and soleus over the other muscles. The improved metabolic function of the muscles during contractile stress has been related to stepped up energy cycle operations through increased transamination reactions and consequent feeding of glycogenic and ketogenic amino acids into oxidative pathway besides, rapid supply of glucose moieties by stimulated phosphorylase action on vitamin treatment.

Animals↗