Cervical schistosomiasis and neoplasia in HIV-infected patients.

We report two HIV-positive women with schistosomiasis of the uterine cervix, a disease that is being increasingly seen in developed countries. In both cases, there were no schistosoma ova in the cervical Papanicolaou smears. Both patients underwent LLETZ procedures that revealed an absence of a granulomatous response to the schistosoma ova, a finding that should alert the pathologist to the possibility of HIV infection. The absence of ova on cervical smears of HIV-infected women with schistosomiasis is probably related to the absence of granulomatous inflammation in these patients. A diligent search should be made for schistosoma ova in the cervical biopsy of patients from endemic areas. Treatment of schistosomiasis in HIV-infected patients should be prompt and complete to prevent recurrent high-risk HPV infection.     

Comparison of patients with idiopathic calcium phosphate and calcium oxalate stones

Our primary objective was to test the hypothesis that a defect in acidification is more common in patients who have idiopathic calcium phosphate kidney stones than in those whose stones are formed mainly of calcium oxalate. Additionally, other risk factors might differ for these 2 stone types. Urine pH was measured serially over 24 hours, and along with ammonium and titratable acid, it was measured before and serially after ingestion of ammonium chloride in 3 groups of subjects: 24 patients with predominantly calcium phosphate stones, 30 patients with calcium oxalate stones, and 15 health non-stone-formers. Twenty-six parameters potentially related to stone formation and acidification were assayed on urines collected over 24 hours, and 15 parameters on blood. The data base was a computerized list of 5900 analyses of stones from patients living in Newfoundland. Patients not known by their physician to have had urinary tract infection, anatomical abnormality, hyperparathyroidism, or renal tubular acidosis were asked to participate in the study. Differences between means were considered significant if p values were less than 0.05 for F by analysis of variance and also less than 0.01 by t-test. In all patients with calcium oxalate stones and all non-stone-formers, urine acidified to pH less than 5.25, but in 8 of the 23 phosphate stone formers who completed the ammonium chloride study urine failed to acidify to pH less than 5.25. As all 8 had normal values for venous pH, total CO2, and chloride, they were considered to have incomplete renal tubular acidosis (IRTA). The 8 phosphate stone formers with IRTA had greater mean values for urine pH on all 9 specimens collected serially over 24 hours (all means greater than 6.2), and after administration of ammonium chloride (p less than 0.01), as well as lower mean values for urine titratable acid excretion (p less than 0.01), both after administration of ammonium chloride and in 24-hour urine samples, compared with the remaining phosphate stone formers whose urine acidified and the oxalate and non-stone-forming control groups. Nearly all the phosphate stone formers had 1 or more risk factors for stone formation, but with frequencies not significantly higher than those found in the oxalate group. Hypercalciuria and hypocitruria were the commonest, but increased oxalate or urate also occurred. Thus, idiopathic calcium phosphate stone formation can be associated with 1 or more of several risk factors, and, with the possible exception of those with IRTA, treatment should be similar to that given to patients with calcium oxalate stones.     

o-Diphenoloxidase of Mycobacterium leprae separated from infecected armadillo tissues.

We reported earlier the occurrence of a unique o-diphenoloxidase in Mycobacterium leprae recovered from lepromatous human tissues. No other source of M. leprae fro biochemical studies was available at the time. In the present report, properties of phenoloxidase in M. leprae separated from infected armadillo tissues are presented. The results show that the o-diphenoloxidase remains unaltered in the passage of the bacilli from the human to the the animal host, indicating that the enzyme is an intrinsic characteristic of the leprosy bacteria.     

Methods for establishing a surveillance system for cardiovascular diseases in Indian industrial populations

OBJECTIVE: To establish a surveillance network for cardiovascular diseases (CVD) risk factors in industrial settings and estimate the risk factor burden using standardized tools. METHODS: We conducted a baseline cross-sectional survey (as part of a CVD surveillance programme) of industrial populations from 10 companies across India, situated in close proximity to medical colleges that served as study centres. The study subjects were employees (selected by age and sex stratified random sampling) and their family members. Information on behavioural, clinical and biochemical determinants was obtained through standardized methods (questionnaires, clinical measurements and biochemical analysis). Data collation and analyses were done at the national coordinating centre. FINDINGS: We report the prevalence of CVD risk factors among individuals aged 20-69 years (n = 19 973 for the questionnaire survey, n = 10 442 for biochemical investigations); mean age was 40 years. The overall prevalence of most risk factors was high, with 50.9% of men and 51.9% of women being overweight, central obesity was observed among 30.9% of men and 32.8% of women, and 40.2% of men and 14.9% of women reported current tobacco use. Self-reported prevalence of diabetes (5.3%) and hypertension (10.9%) was lower than when measured clinically and biochemically (10.1% and 27.7%, respectively). There was marked heterogeneity in the prevalence of risk factors among the study centres. CONCLUSION: There is a high burden of CVD risk factors among industrial populations across India. The surveillance system can be used as a model for replication in India as well as other developing countries.     

Isolated primary intracerebral mycetoma: presenting as a mass lesion in a patient with prostate cancer and multiple myeloma

We report a patient with a history of prostate cancer and multiple myeloma, with a solitary indolent intracerebral mass lesion without any constitutional symptoms and minimal neurologic symptoms. The radiographic appearance of the lesion was that of a tumor but resection revealed a mycetoma, consistent with Aspergillus. A brief review of the literature discusses the rarity, presentation, diagnosis, and management of primary intracerebral mycetomas.     

Application of conductive polymers, scaffolds and electrical stimulation for nerve tissue engineering

Among the numerous attempts to integrate tissue engineering concepts into strategies to repair nearly all parts of the body, neuronal repair stands out. This is partially due to the complexity of the nervous anatomical system, its functioning and the inefficiency of conventional repair approaches, which are based on single components of either biomaterials or cells alone. Electrical stimulation has been shown to enhance the nerve regeneration process and this consequently makes the use of electrically conductive polymers very attractive for the construction of scaffolds for nerve tissue engineering. In this review, by taking into consideration the electrical properties of nerve cells and the effect of electrical stimulation on nerve cells, we discuss the most commonly utilized conductive polymers, polypyrrole (PPy) and polyaniline (PANI), along with their design and modifications, thus making them suitable scaffolds for nerve tissue engineering. Other electrospun, composite, conductive scaffolds, such as PANI/gelatin and PPy/poly(ε-caprolactone), with or without electrical stimulation, are also discussed. Different procedures of electrical stimulation which have been used in tissue engineering, with examples on their specific applications in tissue engineering, are also discussed.     

Cardiovascular research in India: a perspective

With cardiovascular disease (CVD) emerging as a major cause of mortality in India, clinical research in CVD is becoming increasingly important. There are several favorable factors that offer robust growth of clinical research infrastructure in India: well-established system of governance, a large investment in medical education infrastructure, growing interest in building capacity in clinical research, the presence of regulatory mechanisms governing clinical research, a large pharmaceutical industry, and a highly developed information technology and data processing infrastructure. However, the lack of trained research manpower, inadequate public spending on health, uneven distribution of health infrastructure, and the large prevalence of pretransitional diseases are major weakness in undertaking high-quality clinical research in CVD. Analysis of the contemporary scenario reveals that there are 3 important opportunities for clinical research in India: the need to identify low cost but cutting edge and context-specific interventions to address the health needs of India's large population, the potential for high-quality research, and the high degree of interest (domestically and internationally) in investing in clinical research education and infrastructure.