Browsing by Author "Senanayake, S."

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Adaptation and validation of a Sinhala version of the radbound oral motor inventory (ROMP) for Parkinson's disease
(Medknow, 2022) Gamage, P.D.M.H.; Mohideen, M.S.; Galhena, P.; Weerasinghe, N.; Kumbukage, M.P.; Herath, T.; Senanayake, S.; Sirisena, D.; Senanayake, S.J.; Gooneratne, I.K.
Background: The Radboud Oral Motor Inventory for Parkinson's disease (ROMP) is a patient-rated assessment measuring patients' perceptions of speech, swallowing, and saliva control among patients with idiopathic Parkinson's disease (IPD). Objective: The present study was carried out to adapt and validate the Sinhala version of the ROMP questionnaire in a Sinhala-speaking patient cohort diagnosed with IPD. Materials and methods: The study population consisted of patients diagnosed with IPD attending a tertiary care neurology clinic at the National Hospital of Sri Lanka. ROMP was translated from English to Sinhala, and an expert committee verified its content. Construct validity was assessed by correlating the Sinhala ROMP scores with the subscales in speech, salivation, and swallowing of the Unified Parkinson's Disease Rating Scale and with five-point Likert-type scale to assess dysarthria, dysphagia, and drooling by a speech and language therapist. Test-retest reproducibility was assessed by repeating the questionnaire in 2 weeks. Results: A cohort of 21 patients was evaluated (male to female ratio = 2.5:1, mean age was 58.8 [±8.3] years). The Spearman's correlations between ROMP and the Likert-type scale assessment, that is, speech r = 0.85 (P < 0.01), swallowing r = 0.86 (P < 0.01), and drooling r = 0.88 (P < 0.01), and subscales of the UPDRS were statistically significant, that is, speech r = 0.75 (P < 0.01), swallowing r = 0.96 (P < 0.01), and salivation r = 0.94 (P < 0.01). Reproducibility of the three domains and total intraclass correlation coefficients indicated a high level of agreement in test-retest reproducibility (range: 0.98-0.99). The three subdomains of the instrument also had excellent internal consistency (total Cronbach's α = 0.99). Conclusion: The Sinhala version of ROMP has proved to be a good assessment tool for dysphagia, dysarthria, and drooling in the early stage of IPD patients.
Assessment of knowledge and perceptions on leishmaniasis: An island-wide study in Sri Lanka
(Public Library of Science, 2022) Dewasurendra, R.; Silva, H.; Samaranayake, N.; Manamperi, N.; de Silva, N.; Karunanayake, P.; Senarath, U.; Senanayake, S.; Zhou, G.; Karunaweera, N.
Cutaneous leishmaniasis (CL) is a notifiable disease in Sri Lanka with increasing case numbers reported from every part of the country. In addition to disease treatment and vector control measures, knowledge and perceptions in a community are key contributors to a successful intervention program. An island-wide survey was carried out to assess the knowledge and perceptions regarding CL across the island, with 252 confirmed CL cases and 2,608 controls. Data was collected by trained personnel, using a pre-tested Case Reporting Form (CRF). Although the percentage who referred to CL by its correct name was low (1.4%), majority stated that it is a fly induced skin disease (79.1%). Knowledge on the symptoms, curability and the name of the vector was high in these communities, but specific knowledge on vector breeding places, biting times and preventive methods were poor. The patients were more knowledgeable when compared to the controls. Differences in the level of knowledge could be identified according to the level of education of the participants as well as across the different areas of the country. The main source of information was through the healthcare system, but the involvement of media in educating the communities on the disease was minimal. While this study population was unaccustomed to the use of repellants or sprays, the use of bed nets was high (77.7% of the participants) in this study population. Although misconceptions and incorrect practices are rare in Sri Lankan communities, promoting health education programs which may improve disease awareness and knowledge on vector and its control will further strengthen the control and prevention strategies.
Ma-Lena, a marble cave in Sri Lanka
(University of Kelaniya, 2011) Jayasingha, P.; Dandeniya, A.S.; Senanayake, S.; Champika, W.G.M.; Dewaka, R.; Welianga, W.S.
Ma-Lena which is located at the western foothills of the peak wilderness mountain range and close to Kaluganaga is an underground cave complex. The cave is situated in Guruluwana of Rathnapura District. Physiographically the cave area belongs to wet zone of the country. During a field visit the cave was scientifically explored and speleological aspects were primarily studied with an idea of carrying out a complete research study in future. Though it has several entrances two are the main which have wide mouths to the North and South. North entrance opens to a higher elevated chamber complex while the other entrance opens to a lower elevated chamber complex. Both chamber complexes are connected by vertical tunnels and small chambers at various places. In addition, several small chambers are connected to a main chamber in each complex. The cave complex is hydrologically active. Geologically, the cave is made up of impure marble of highland complex. Floated country rocks in the marble are highly weathered and some mineralized zones can be observed. The grain size of the marble varies from place to place. The formation of cave chambers is directly correlated with a fluvial weathering process. The chamber walls and ceilings are being nicely polished by the flowing water. The fluvial weathering is further evidenced by weathering features of the bed rock marble which extends up to the land surface. In addition, some elluvial deposits are brecciated. Speleothems are characterized by the presence of rim pools, cave curtains, stalagmites, stalactites, cave pearls, siliceous deposits, cave pillars, helictites and flowstones. The cave is home for mainly chiropteran bats which are definitely in thousands of numbers. Their guano deposits make a thick carpet on the floor of the chambers. In addition, insects, mollusks and shrimp species were also found in the cave stream. This cave is the largest limestone cave recorded by our team in Sri Lanka.
Neurological disorders associated with COVID-19 in Sri Lanka
(BioMed Central,, 2023) Chang, T.; Wijeyekoon, R.; Keshavaraj, A.; Ranawaka, U.; Senanayake, S.; Ratnayake, P.; Senanayake, B.; Caldera, M.C.; Pathirana, G.; Sirisena, D.; Wanigasinghe, J.; Gunatilake, S.; ASN COVID-19 Study Group
BACKGROUND: Neurological manifestations of SARS-CoV-2 infection have been reported from many countries around the world, including the South Asian region. This surveillance study aimed to describe the spectrum of neurological disorders associated with COVID-19 in Sri Lanka. METHODS: COVID-19 patients manifesting neurological disorders one week prior and up to six weeks after infection were recruited from all the neurology centres of the government hospitals in Sri Lanka from May 2021 – May 2022. Data was collected using a structured data form that was electronically transmitted to a central repository. All patients were evaluated and managed by a neurologist. Data were analysed using simple descriptive analysis to characterise demographic and disease related variables, and simple comparisons and logistic regression were performed to analyse outcomes and their associations. RESULTS: One hundred and eighty-four patients with neurological manifestations associated with COVID-19 were recruited from all nine provinces in Sri Lanka. Ischaemic stroke (31%) was the commonest neurological manifestation followed by encephalopathy (13.6%), Guillain–Barre syndrome (GBS) (9.2%) and encephalitis (7.6%). Ischaemic stroke, encephalitis and encephalopathy presented within 6 days of onset of COVID-19 symptoms, whereas GBS and myelitis presented up to 10 days post onset while epilepsy and Bell palsy presented up to 20 – 40 days post onset. Haemorrhagic stroke presented either just prior to or at onset, or 10 – 25 days post onset of COVID-19 symptomatic infection. An increased frequency of children presenting with encephalitis and encephalopathy was observed during the Omicron variant predominant period. A poor outcome (no recovery or death) was associated with supplemental oxygen requirement during admission (Odds Ratio: 12.94; p=0.046). CONCLUSIONS: The spectrum and frequencies of COVID-19 associated neurological disorders in Sri Lanka were similar to that reported from other countries, with strokes and encephalopathy being the commonest. Requiring supplemental oxygen during hospitalisation was associated with a poor outcome.
Ocular trematodiasis in children, Sri Lanka
(National Center for Infectious Diseases, 2023) Mallawarachchi, C.H.; Dissanayake, M.M.; Hendavitharana, S.R.; Senanayake, S.; Gunathilaka, N.; Chandrasena, T.G.A.N.; Yahathugoda, T.C.; Wickramasinghe, S.; de Silva, N.R.
Using histopathology and phylogenetic analysis of the internal transcribed spacer 2 gene, we found >2 distinct trematode species that caused ocular trematode infections in children in Sri Lanka. Collaborations between clinicians and parasitologists and community awareness of water-related contamination hazards will promote diagnosis, control, and prevention of ocular trematode infections.
Risk factor analysis of cutaneous leishmaniasis in Sri Lanka through a nationwide survey
(American Society of Tropical Medicine and Hygiene, 2024) Dewasurendra, R.; Samaranayake, N.; Silva, H.; Manamperi, N.; Senerath, U.; Senanayake, S.; De Silva, N.; Karunanayake, P.; Zhou, G.; Karunaweera, N.
Leishmaniasis in Sri Lanka was first reported in the early 1990s. Cutaneous leishmaniasis (CL) cases have markedly increased in recent years, demanding due attention from health authorities. The spatial distribution of CL is not homogeneous. This case-control study investigated factors that may contribute to this heterogeneous distribution through a nationwide study. Information on sociodemographic, economic, and environmental characteristics was collected from study participants (cases, n = 303; controls, n = 2,762). All individuals were followed up for 3 years, and signs of CL or associated complications were recorded. Differences in possible risk factors between cases and controls were analyzed. Individuals <18 years old, electricity supply, spending >2 hours outdoors, visiting jungles/water bodies, and living near CL patients were identified as risk factors. Household members of 1.3% of cases, 2.3% of controls residing within a perimeter of 500 m from a patient, and 0.8% of controls living beyond 2 km from a case developed CL. Thus, CL in Sri Lanka appears intertwined with living environment and host behavior. Common environmental factors may be responsible for the higher risk of CL in individuals living in close proximity to CL patients. This may at least partly explain the clustering of CL cases in selected areas of the country.
Spatial epidemiologic trends and hotspots of leishmaniasis, Sri Lanka, 2001-2018
(Centers for Disease Control and Prevention (CDC), 2020) Karunaweera, N.D.; Ginige, S.; Senanayake, S.; Silva, H.; Manamperi, N.; Samaranayake, N.; Siriwardana, Y.; Gamage, D.; Senerath, U.; Zhou, G.;
ABSTRACT: Leishmaniasis, a neglected tropical disease, is on the decline in South Asia. However, cases of cutaneous leishmaniasis have risen in Sri Lanka since 2001, and the lack of in-depth research on its epidemiologic characteristics hampers control efforts. We analyzed data collected from patients with cutaneous leishmaniasis in Sri Lanka during 2001-2018 to study temporal and geographic trends and identify and monitor disease hotspots. We noted a progression in case rates, including a sharp rise in 2018, showing temporal expansion of disease-prevalent areas and 2 persistent hotspots. The northern hotspot shifted and shrank over time, but the southern hotspot progressively expanded and remained spatially static. In addition, we noted regional incidence differences for age and sex. We provide evidence of temporally progressive and spatially expanding incidence of leishmaniasis in Sri Lanka with distinct geographic patterns and disease hotspots, signaling an urgent need for effective disease control interventions. KEYWORDS: Asia; Indian subcontinent; Leishmania donovani; Sri Lanka; cutaneous leishmaniasis; dermatological pathologies; epidemiology; infectious diseases; leishmaniasis; parasites; protozoa; skin lesions; vector-borne infections.
Spatiotemporal distribution of cutaneous leishmaniasis in Sri Lanka and future case burden estimates
(Public Library of Science, 2021) Karunaweera, N.D.; Senanayake, S.; Ginige, S.; Silva, H.; Manamperi, N.; Samaranayake, N.; Dewasurendra, R.; Karunanayake, P.; Gamage, D.; de Silva, N.; Senarath, U.; Zhou, G.
BACKGROUND: Leishmaniasis is a neglected tropical vector-borne disease, which is on the rise in Sri Lanka. Spatiotemporal and risk factor analyses are useful for understanding transmission dynamics, spatial clustering and predicting future disease distribution and trends to facilitate effective infection control. METHODS: The nationwide clinically confirmed cutaneous leishmaniasis and climatic data were collected from 2001 to 2019. Hierarchical clustering and spatiotemporal cross-correlation analysis were used to measure the region-wide and local (between neighboring districts) synchrony of transmission. A mixed spatiotemporal regression-autoregression model was built to study the effects of climatic, neighboring-district dispersal, and infection carryover variables on leishmaniasis dynamics and spatial distribution. Same model without climatic variables was used to predict the future distribution and trends of leishmaniasis cases in Sri Lanka. RESULTS: A total of 19,361 clinically confirmed leishmaniasis cases have been reported in Sri Lanka from 2001-2019. There were three phases identified: low-transmission phase (2001-2010), parasite population buildup phase (2011-2017), and outbreak phase (2018-2019). Spatially, the districts were divided into three groups based on similarity in temporal dynamics. The global mean correlation among district incidence dynamics was 0.30 (95% CI 0.25-0.35), and the localized mean correlation between neighboring districts was 0.58 (95% CI 0.42-0.73). Risk analysis for the seven districts with the highest incidence rates indicated that precipitation, neighboring-district effect, and infection carryover effect exhibited significant correlation with district-level incidence dynamics. Model-predicted incidence dynamics and case distribution matched well with observed results, except for the outbreak in 2018. The model-predicted 2020 case number is about 5,400 cases, with intensified transmission and expansion of high-transmission area. The predicted case number will be 9115 in 2022 and 19212 in 2025. CONCLUSIONS: The drastic upsurge in leishmaniasis cases in Sri Lanka in the last few year was unprecedented and it was strongly linked to precipitation, high burden of localized infections and inter-district dispersal. Targeted interventions are urgently needed to arrest an uncontrollable disease spread.
Sri Lankan clinical practice guidelines: A methodological quality assessment utilizing the AGREE II instrument.
(Wiley-Blackwell, 2019) Talagala, I. A.; Samarakoon, Y.; Senanayake, S.; Abeysena, C.
RATIONALE, AIMS, AND OBJECTIVES: Clinical practice guidelines (CPG) play a major role in patient care in Sri Lanka. This study evaluates the methodological quality of the Sri Lankan CPGs developed in 2007. METHODS: A total of 94 CPGs developed by several professional colleges in Sri Lanka in the year 2007 were evaluated by 2 independent reviewers using AGREE II instrument for their methodological quality. Item score being ≤3 points was defined as "poor quality". Each domain score was calculated according to AGREE II. A guideline was labelled as "strongly recommended" if 4 or more domains scored above 60%, "recommended for use with certain modification" if only 3 domain scores were above 60% or if 4 or more domain scores were between 30% and 60%, and "not recommended" if 4 or more domains scored less than 30%. RESULTS: Most (22.3%) guidelines were developed by the College of Pathologists. Most of the guidelines (>55%) poorly reported on all the items, except for items 1, 2, and 22 of AGREE II. Median domain scores [range] and the proportion of the guidelines with domain score of <30% were as follows: domain on scope and purpose (33.3% [2.8%-83.3%]; 42.6%), stakeholder involvement (14.9% [0.0%-61.1%]; 81.9%), rigour of development (6.1% [0.0%-49%]; 98.9%), clarity and presentation (30.5% [8.3%-61.1%]; 46.8%), and applicability (8.3% [4.2%-14.6%]; 100%). All CPGs scored 50% for "editorial independence". Reviewers reported the overall quality was poor in 86 (91.5%). Based on the definitions used in the study, of 94 CPGs, 8 (8.5%) could be recommended to be used with modifications, while 86 (91.5%) could not be recommended for clinical practice. CONCLUSIONS: The methodological quality of the CPGs was poor irrespective of the source of development. Major efforts are essential to update the CPGs according to the principles of evidence based medicine.