Health effects of the Bhopal gas leak: a review.

The methyl isocyanate (MIC) gas leak from the Union Carbide plant at Bhopal, India in 1984 was the worst industrial disaster in history. Exposure estimates of gas concentrations in the area range from 85 to 0.12 ppm. Of the approximately 200,000 persons exposed, 3598 deaths have resulted as of November 1989. Chronic inflammatory damage to the eyes and lungs appears to be the main cause of morbidity. Reproductive health problems in the form of increased spontaneous abortions and psychological problems have been reported. Questions about the nature of MIC toxicity have been raised by the persistence of multi-systemic symptoms in survivors. Animal studies using radio-labeled MIC given by the inhalation route have shown that the radio-label is capable of crossing the lung membranes and being distributed to many organs of the body. This paper reviews health effects of gas exposure from published studies and discusses some of the clinical and epidemiological issues being debated.

Perception of pharmacovigilance among doctors in a tertiary care hospital: influence of an interventional lecture.

INTRODUCTION: One of the important pillars of an efficient pharmacovigilance system is contribution by healthcare professionals in the form of spontaneous reporting. This study was aimed at investigating the knowledge, attitude and practice of spontaneous ADR reporting among doctors in a teaching hospital in Pune, and to analyze the effect of an informative lecture about Pharmacovigilance on the same. METHODOLOGY: This was an interventional study conducted among 220 doctors at a tertiary care teaching hospital, Pune. Each participant was explained the purpose of study and asked to fill in a questionnaire about their knowledge, attitude and practice of pharmacovigilance. Only 80 of them attended the interventional lecture on Pharmacovigilance and again filled up the questionnaire after a period of one month from this intervention. RESULTS: Merely 7.5% of the participants knew ADR reporting system in India. Majority of the respondents (95%) knew that, as doctors, they could report ADRs but were unaware about the methodology to report (92.5%) which affected their practice of Pharmacovigilance. All (100%) the participants expressed that proper training should be provided to clinicians for ADR reporting & 81% felt ADR reporting should be made mandatory. Only 80 participants (36.4%) attended the interventional lecture which reflected a poor response. Intervention improved their (96%) knowledge about ADR reporting system and now majority of them (92%) agreed that all sort of ADRs should be reported (p < 0.001). CONCLUSION: Attitude towards ADR reporting was positive but knowledge about ADR reporting system was inadequate among doctors working in a teaching hospital in Pune. Education helped in improving knowledge and had an impact on attitude of participants regarding pharmacovigilance.

Clinical utility of serum interleukin-8 and interferon-alpha in thyroid diseases.

Serum interleukin-8 (IL-8) and interferon-alpha (IFN-α) levels have been estimated from a total of 88 individuals of which 19 were disease-free healthy individuals, and 69 were patients with thyroid diseases: goitre (N = 21), autoimmune diseases (N = 16), and carcinomas (N = 32). Both IL-8 and IFN-α were significantly higher in all the patients as compared to healthy individuals. Serum IL-8 levels showed significant positive correlation with disease stage in thyroid cancer patients. Higher serum IL-8 levels were associated with advanced disease stage while no significant correlation was observed between serum IFN-α levels and any of the clinicopathological parameters. IL-8 and IFN-α significantly correlated with each other in anaplastic carcinoma patients. Finally concluding, monitoring the serum IL-8 and IFN-α levels can help differentiate patients with thyroid diseases from healthy individuals, and IL-8 seems to have a role in the pathogenesis of thyroid diseases and may represent a target for innovative diagnostic and therapeutic strategies.

Bhopal-A Case Study of International Disaster.

This paper outlines what is known about the probable events leading up to the disaster in Bhopal, India, in 1984, wherein release of a gas cloud from an industrial plant killed over 3,800 people. It briefly reviews the toxicology of methyl isocyanate, a major component of the cloud; presents an overview of the acute and chronic health effects of the gas exposure from published human and animal studies; identifies some of the clinical dilemmas and medical management and epidemiologic issues being debated; provides an insight into national and transnational implications; and summarizes the lessons learned or not learned from this disaster of global significance.

An assessment of a urinary biomarker for total human environmental exposure to benzo[a]pyrene.

Urinary banzo[a]pyrene (BaP) metabolite levels were compared to human environmental exposure to BaP through inhalation and dietary ingestion to assess the predictive validity of the exposure biomarker. These measurements were made for 14 adult volunteers over 14 consecutive days, once during summer/fall, again during winter periods. Based on personal air monitoring, median potential inhalation doses of 11.0 and 2.3 ng/day were estimated for the winter and summer/fall studies, respectively. A median potential ingested dose of 176 ng/day, estimated from "duplicate plate" sampling, exceeded inhalation by 6- and 122-fold for the winter and summer/fall studies, respectively. "Total" urinary BaP metabolites were measured using a published "reverse metabolism" (BaP) method of analysis. Median rates of urinary BaP metabolite elimination for the winter and summer/fall studies were 121 and 129 ng/day, respectively. The changes in inhaled and ingested potential doses were regressed on the change in urinary metabolite elimination from week 1 to week 2 to test the predictive validity of the biomarker measurement. The regression was statistically significant (r = 0.620, p = 0.015, n = 25) when body weight was included and two extreme values were removed. Consistent with the exposure measurements showing diet as the dominant route of exposure, most of the variation in urinary metabolite elimination was explained by the ingested dose. It is concluded that the measurement of urinary BaP by "reverse metabolism" is qualitative and of marginal predictive validity as an exposure biomarker due to the method's low recoveries and the large unexplained variance.