Conference Papers
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This collection contains abstracts of conference papers, presented at local and international conferences by the staff of the Faculty of Medicine
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Item Development of a Snakebite risk map for Sri Lanka(Sri Lanka Medical Association, 2016) Ediriweera, D.S.; Kasturiratne, A.; Pathmeswaran, A.; Gunawardena, N.K.; Wijayawickrama, B.A.; Jayamanne, S.F.; Isbister, G.K.; Dawson, A.; Giorgi, E.; Diggle, P.J.; Lalloo, D.G.; de Silva, H.J.INTRODUCTION: Snakebite is a public health problem in Sri Lanka and about 37,000 patients are treated in government hospitals annually. At present, health care resources which are required to manage snakebite are distributed based on the administrative boundaries, rather than based on scientific risk assessment. OBJECTIVES: The aim of the study is to develop a snakebite risk map for Sri Lanka. METHOD: Epidemiological data was obtained from a community-based island-wide survey. The sample was distributed equally among the nine provinces. 165,665 participants (0.8%of the country’s population) living in 1118 Grama Niladhari divisions were surveyed. Generalized linear and generalized additive models were used for exploratory data analysis. Model-based geostatistics was used to determine the geographical distribution of snakebites. Monte Carlo maximum likelihood method was used to obtain parameter estimates and plug-in spatial predictions were obtained. Probability contour maps (PCM) were developed to demonstrate the spatial variation in the probability that local incidence does or does not exceed national snakebite incidence. RESULTS: Individual point estimate snakebite incidence map and PCM were developed to demonstrate the national incidence of snakebite in Sri Lanka. Snakebite hotspots and cold spots were identified in relation to the national snakebite incidence rate. Risk maps showed a within-country spatial variation in snakebites. CONCLUSIONS: The developed risk maps provide useful information for healthcare decision makers to allocate resources to manage snakebite in Sri Lanka.Item Snakebite in children: a two year retrospective review of victims admitted to a tertiary care hospital in sri lanka(Sri Lanka College of Paediatricians, 2010) Jayasinghe, Y.C.; Kasturiratne, A.; Rajindrajith, S.; Samaraweera, S.A.S.G.; de Silva, H.J.INTRODUCTION: Snakebite is an incident which causes great parental concern and medical unease, and envenomation is always more serious in a child. OBJECTIVE: To determine the pattern and characteristics of snake bites in children admitted to a tertiary care hospital in Southwest Sri Lanka. DESIGN, SETTING AND METHOD: A retrospective descriptive study was conducted to collect data on circumstances of the bite, clinical manifestations and management of paediatric victims of snakebite. Patient records of children admitted to the paediatric wards of Colombo North Teaching Hospital, Ragama, from January 2008 to December 2009 were reviewed. RESULTS: Our study population comprised 41 children (1.6 per 1000 admissions). Malerfemale ratio was 23:18. Mean age was 6 (SD=3.46) years. The bites were definite in 4 subjects and circumstantial (fang marks, signs of local and systemic envenomation) in the others. Twenty five (61%) were between 5 to 12 years of age. Nine (22%) bites occurred indoors and 13 (31.7%) in the home garden. In 12 (29.3%) the place of bite was not documented. In 42% the bite took place between 4pm-8pm. The snake species was identified by carers in 19 (46%) and confirmed by a doctor in 16 (39%) by identifying the dead snake. Of the 16 snakes brought for identification., 8 were hump-nosed vipers, 2 were Russell vipers, one was a krait and the rest were non-venomous species. Definite puncture marks were seen in 17 (41.4%) and were on the lower limbs in 11 (26.8%) and on the upper limbs in 6 (14.6%). First aid was given to 12 (29%) of the victims and the median time taken to reach hospital was 30 minutes (range 10 minutes to 15 hours). Nephrotoxicity developed in 1 (2.4%) (Russell viper bite). Antivenom was required by only 4 children in whom Russell viper bite was either suspected or confirmed. Three children developed reactions to antivenom. There were no deaths. None required intensive care. The median stay in hospital was 1 day (range 1-5 days) with 35 (94.6%) children being discharged home within 2 days. CONCLUSIONS: Snakebite in children was mainly diagnosed on circumstantial evidence, and mostly occurred in and around their homes. The outcome was good in all patients probably because the hump-nosed viper or non-venomous snakes were the offenders in most cases in this study.Item Estimates of disease burden due to snakebite in Sri Lankan hospitals(Sri Lanka Medical Association, 2003) Kasturiratne, A.; Pathmeswaran, A.; Fonseka, M.M.D.; Lalloo, D.G.; Brooker, S.; de Silva, H.J.INTRODUCTION: There have been no country-wide studies or estimates of disease burden due to snakebite in Sri Lankan hospitals. OBJECTIVES: To assess disease burden due to snakebite and estimate relative frequency of the biting species in hospitals situated in different parts of the country. METHODS: Hospital morbidity and mortality data on snakebite was obtained for each administrative district. Sri Lanka was divided into 5 zones based on climate and available data on snake habitat (Zone 1-wet zone altitude <900m; Z2-intermediate zone; Z3-dry zone, Z4-wet zone altitude >900m; Z5-northern and north-western dry zone). Administrative districts were allocated to zones based on their geographical location and population using geographical information systems technology. Hospital morbidity and mortality data were collated for the 5 zones. A survey among physicians (37 physicians in 42 hospitals covering the 5 zones) was used (Delphi technique) to estimate the proportion of snakebites by different species and requirement of hospital resources, in each zone. Results: There was a clear difference in incidence of hospital admissions due to snakebite in the different zones (Z3-3.5 and Z4-0.4 per 1000 population). The distribution of bites by individual species also varied between zones (deadly venomous species Z3-85%, Z2-45%), moderately venomous and mildly-venomous species Z4-100%, Zl-70%). These trends corresponded to estimates of requirements for AVS and other hospital facilities (in 2000, Z3-86100 vials of AVS, 7380 Intensive care unit patient-days; Zl-26400 vials of AVS, 2640ICU patient-days). CONCLUSIONS: Incidence of hospital admissions due to snakebite and estimates of relative medical importance of different snake species show geographic variation within the country. This is reflected in estimates of requirements for facilities. Zoning based on environmental information rather than on political boundaries could lead to better distribution of health care resources for management of snakebite in hospitals situated in different parts of the country.Item Beliefs and knowledge regarding snakebite in rural Sri Lanka: a qualitative survey(Sri Lanka Medical Association, 2003) Makita, L.S.; Nandasena, S.; Costa, M.R.A.; Kasturiratne, A.; Pathmeswaran, A.; Lalloo, D.G.; de Silva, H.J.OBJECTIVES: To identify common beliefs and assess knowledge regarding snakebite in rural Sri Lanka, and their influence on health-seeking behaviour. METHODS: Qualitative methods (focus group discussions and key informant interviews) were used to obtain data in five rural locations in wet, intermediate and dry zones. Data was subjected to "framework analysis" involving familiarisation, identification of thematic frame, indexing and coding, charting, mapping, and interpretation. RESULTS: People are aware of risk-behaviour associated with snakebite, and have reasonable knowledge regarding venomous and non-venomous snakes. However, differences in nomenclature sometimes lead to confusion in identifying species. Beliefs and legends, which are linked to religion, have lead people to respect the cobra. Traditional healers claim they can determine the snake species, clinical manifestations that may occur, and prognosis, based on phenomena, such as, day of the week and phase of the moon when the bite took place. They still employ treatment methods, such as wound incision with broken glass and scalp incision for applying potions. Although there is respect for traditional healing, there is acceptance of the efficacy of western medicine. Beliefs, such as, anti-venom though effective is toxic, long-term effects of snake venom can be completely neutralised only by traditional medicine, and producing the dead snake is essential for treatment in hospitals, lead people to seek treatment by traditional healers rather than in hospitals. CONCLUSIONS: Beliefs and misconceptions influence health-seeking behaviour following snakebite. There seems to be a growing acceptance of western medicine. However, traditional healing methods are still popular, but include harmful^rjractices. This information could form a basis for. educational intervention.Item Snakebites in children - a five year retrospective review of victims admitted to two hospitals in Sri Lanka(Sri Lanka Medical Association, 2012) Jayasinghe, Y.C.; Kasturiratne, A.; Somaraweera, S.A.S.G.; de Silva, H.J.INTRODUCTION: Snakebite in children causes great parental concern and medical unease. AIMS: To determine characteristics of paediatric snakebite in two hospitals, in the wet zone (Colombo North Teaching Hospital (CNTH) and dry zone (Base Hospital Polonnaruwa-BHP). METHODS: A retrospective study collected data on snakebite by reviewing records of children admitted to CNTH and BHP from January 2007 to December 2011. RESULTS: There were 188 snakebite victims (CNTH 71, BHP 117).Similarities in the two cohorts were (CNTH and BHP -M:F=35:36and 64:53; mean age 6 years (SD3) and 7 years (SD3); definite bites 30(53.6%) and 39(37.5%); circumstantial evidence in 57(80.3%) and 84(71.8%);time of bite: between 4- 8pm 42.6% and 47.2%. Majority of confirmed bites were HNV (60%) in CNTH and Kraits (30.8%) in BHP. Differences in the cohorts were :place of bite: in and around the home, median time from bite to hospital, administration of first aid, antivenom use, intensive care, median (range) duration of hospitalization and deaths (CNTH vs BHP): 37(56.9%) and 29(27.6%),35 vs 102.5 minutes, 21.4% vs 1%, 5.6% vs 17.1%, 1.4% vs 5.1%, 1 (1-7) days vs 2 (1-13), 0 vs 3.4% (Krait bites). CONCLUSIONS: Snakebites occur in ambulatory children, diagnosed mainly on circumstantial evidence and occur in and around homes irrespective of geographic location. Clinical features and outcome depend on offending species and availability of resources.Item Community incidence of snakebite in the Amiradhapura district(Sri Lanka Medical Association, 2013) Kasturiratne, A.; Gunawardena, N.K.; Wijayawickrama, B.A.; Jayamanne, S.F.; Pathmeswaran, A.; Isbister, G.; Dawson, A.; de Silva, H.J.INTRODUCTION AND OBJECTIVES: The community incidence of snakebite in Sri Lanka is unknown. To investigate incidence of snakebite, we undertook a community study in the Anuradhapura district as part of an ongoing countrywide survey on snakebite. METHODS: The survey was designed to sample at least 1% of the population in each district Within the district, a Grama Niladhari (GN) division, was defined as a cluster for data collection. The number of clusters required to sample at least 1 % of the population was first determined, and clusters were then selected using simple random sampling. In each selected cluster 40 households were sampled consecutively from a random starting point. Population estimates of snakebite were constructed for the district. RESULTS: The Anuradhapura district has a total of 694 GN divisions, and 84 were surveyed. This included 3357 households and a population of 13,428 (1.6% of the district's population). Eightysix snakebites were reported within the last 12 months. Extrapolating this to the district (mid-year population=855,373), the estimated snakebites in Anuradhapura district was 5478. The crude community incidence of snakebite in the Anuradhapura district was 640.5 per 100, 000 population. CONCLUSIONS: The incidence of snakebite in the community is high in the Anuradhapura district, with one in 156 persons bitten annually.Item Underestimation of snakebite mortality by hospital statistics in the Monaragala District(Sri Lanka Medical Association, 2005) Fox, S.; Rathuwithana, A.C.; Kasturiratne, A.; Lalloo, D.G.; de Silva, H.J.INTRODUCTION: Estimates of snakebite mortality rely upon deaths recorded in hospital. This study compared the number of recorded snakebite deaths in hospitals with registered deaths from the same district. METHODS: Snakebite mortality data for the period 1999-2003 were obtained for all hospitals in Monaragala District from the Medical Statistics Unit, Colombo. Data on snakebite as a certified cause of death for the district were obtained from the Registrar General's Department. Hospital mortality data were cross-checked at 7 of the 18 hospitals in the district [Base Hospital Monaragala, District Hospitals Bibile, Kataragama, Siyambalanduwa, Medagama and Wellawaya, and Rural Hospital Ethimale], accounting for 66% of recorded deaths. Registrar General's data were cross-checked at 19 of the 33 Divisional Secretariats in the District. RESULTS: We found that the data recorded centrally corresponded to what was documented in hospitals and Divisional Secretariats that we visited. For the 5-year period, there were 27 snakebite deaths recorded in hospitals in the Monaragala District. However, death registrations for the same district identified 72 deaths due to snakebite. The true number of snakebite deaths in Monaragala District was, therefore, 2.7 (95% confidence interval 2.0 - 3.7) times higher than the number of deaths recorded in hospitals. CONCLUSION: Our study convincingly demonstrates that hospital data underestimate the true burden of snakebite mortality; many victims probably die before reaching hospital. Although our study was limited to the Monaragala district, the findings probably reflect the situation in many areas of Sri Lanka where snakebite is a problem and public amenities are limited. We recommend large scale community surveys to more accurately determine the magnitude of snakebite mortality in this country.Item Development and assessment of a psychological intervention for snakebite victims(Sri Lanka Medical Association, 2014) Wiiesinahe, C.A.; Williams, S.S.; Dolawatta, N.; Wimalaratne, A.K.G.P.; Kasturiratne, A.; Wijewickrema, B.; Jayamanne, S.F.; Lalloo, D.G.; Isbister, G.K.; Dawson, A.; de Silva, H.J.INTRODUCTION AND OBJECTIVES: There is significant delayed psychological morbidity and negative psycho-social impact following snakebite. However, no psychological support is provided to victims. We aimed to develop and assess the effectiveness of a brief intervention which can be provided by non-specialist medical officers aimed at reducing psychological morbidity. METHODS: In a single blind clinical trial at Polonnaruwa Hospital, 187 snakebite victims were randomised into three arms. One arm received no psychological intervention (Group A; n=59; control). Group B (n=60) received psychoeducation at discharge from hospital. Group C (n=68) received psychoeducation and a.second intervention one month later based on cognitive behavioural principles. All patients were assessed six months after discharge from hospital using standardised tools for presence of psychological symptoms and level of functioning. RESULTS: Compared with Group A, there was a significant reduction in anxiety symptoms measured by the Hopkins Psychiatric Symptom check list (16.9% vs. 5.9%, p=0.047, Chi-Squared test) and a non-significant trend towards improvement in the level of functioning measured by the Sheehan Disability inventory (6.47 vs. 4.69) in Group C, but not in Group B. There was no difference in rates of depression and post-traumatic stress disorder (PTSD) between the three groups. CONCLUSIONS: Our preliminary findings suggest that brief psychological interventions which include psychoeducation plus cognitive behavioural therapy given by non-specialist doctors, but not psychoeducation alone seem to reduce anxiety and facilitate a trend towards improved function in snakebite victims. However, these interventions had no effect on depression or PTSD.