Chathura Siriwardhana

Dr. Chathura Siriwardhana


Research Focus & Metrics

Academic Career Length

10Years (2017-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 June 2018 in BMC Public Health
Verified
Journal Article
Open access
PDF file
CSChathura Siriwardhana
Chathura Siriwardhana
Eunjung LimEunjung Lim
Eunjung Lim
JDJames Davis
James Davis
JCJohn J. Chen
John J. Chen
Diabetes mellitus, ischemic heart disease, and chronic kidney disease are three major chronic conditions that develop with increasing risks among adults as they get older. The interconnectedness of these three chronic conditions is well known, while each condition acts as a prognostic risk factor for the other two. It is important to understand the progressive relationships of these three conditions over time in terms of transitioning between clinical states and the impact on patients’ survival. We investigate the survival characteristics of a Medicare population aged 65 years and above in a multistate system that contained clinical states specified by death and diagnosis combinations of three chronic conditions. The study was conducted using Hawaii Medicare claims data from 2009 to 2013. To evaluate the progression of a subject with one of the newly diagnosed chronic conditions, we analyzed quantities such as state occupation probabilities in eight states and hazards of sixteen transition types. We quantified effects and significances of potential covariates such as age, gender, race/ethnicity, comorbidity burden and financial status on these temporal functions. Nonparametric method of estimating state occupation probabilities and pseudo-value based method for estimating covariate effects of a survival system were utilized. We found a range of age, gender, race/ethnicity and financial status based interesting covariate influences on transitions and state occupation probabilities of the system. Survival characteristics of the disease system are influenced by subject-specific effects. Subgroup-specific interventions/screenings should be considered for the optimal prevention and care.

8 January 2019 in BMC Cancer
Verified
Journal Article
Open access
PDF file
CSChathura Siriwardhana
Chathura Siriwardhana
VKVedbar Singh Khadka
Vedbar Singh Khadka
JCJohn J. Chen
John J. Chen
Youping DengYouping Deng
Youping Deng
We utilized miRNAs expression and clinical data to develop a prognostic signature for patients with lung adenocarcinoma, with respect to their overall survival, to identify high-risk subjects based on their miRNA genomic profile. MiRNA expressions based on miRNA sequencing and clinical data of lung adenocarcinoma patients (n = 479) from the Cancer Genome Atlas were randomly partitioned into non-overlapping Model (n = 320) and Test (n = 159) sets, respectively, for model estimation and validation. Among the ten miRNAs identified using the univariate Cox analysis, six from miR-8, miR-181, miR-326, miR-375, miR-99a, and miR-10, families showed improvement of the overall survival chance, while two miRNAs from miR-582 and miR-584 families showed a worsening of survival chances. The final prognostic signature was developed with five miRNAs—miR-375, miR-582-3p, miR-326, miR-181c-5p, and miR-99a-5p—utilizing a stepwise variable selection procedure. Using the KEGG pathway analysis, we found potential evidence supporting their significance in multiple cancer pathways, including non-small cell lung cancer. We defined two risk groups with a score calculated using the Cox regression coefficients. The five-year survival rates for the low-risk group was approximately 48.76% (95% CI = (36.15, 63.93)); however, it was as low as 7.50% (95% CI = (2.34, 24.01)) for the high-risk group. Furthermore, we demonstrated the effect of the genomic profile using the miRNA signature, quantifying survival rates for hypothetical subjects in different pathological stages of cancer. The proposed prognostic signature can be used as a reliable tool for identifying high-risk subjects regarding survival based on their miRNA genomic profile.

10 November 2018 in Journal of Mental Health
Verified
Journal Article
Closed access
Eunjung LimEunjung Lim
Eunjung Lim
KGKrupa Gandhi
Krupa Gandhi
CSChathura Siriwardhana
Chathura Siriwardhana
JDJames Davis
James Davis
JCJohn J. Chen
John J. Chen
Background: Racial/ethnic differences have not been adequately addressed in the utilization of mental health services among Medicaid populations. Aim: This study aimed to examine racial/ethnic differences in the utilization of health services for mental disorders in a Medicaid adult population aged between 21 and 64 years. Methods: Racial/ethnic differences in inpatient, outpatient and emergency department services utilization were assessed using 2010 Hawaii Medicaid data. Zero-inflated negative binomial regressions were employed adjusting for age, sex and residential area. Results: Among 73,200 beneficiaries, 29.7% were Whites, 28.5% Asians, 34.7% Native Hawaiians and Pacific Islanders (NHPIs); 60.2% were younger (21–44 years) and 58.6% were females. The patterns of utilization of health services differed across race/ethnicity. Compared to Whites, Asians and NHPIs were less likely to use outpatient services and had lower rates of inpatient visits. NHPIs were also estimated to have lower rates of outpatient and emergency department visits. Conclusion: Variation in the utilization of health services emphasizes the importance of race/ethnicity in mental health management. Various factors, such as language barriers and cultural differences, should be considered in developing clinical interventions or integrative health programs that aim to reduce racial/ethnic disparities among people with mental disorders.

6 July 2020 in Biometrical Journal
Verified
Journal Article
Closed access
PDF file
CSChathura Siriwardhana
Chathura Siriwardhana
KKKB Kulasekera
KB Kulasekera

16 March 2022 in Statistics in Medicine
Verified
Journal Article
Closed access
KKKB Kulasekera
KB Kulasekera
CSChathura Siriwardhana
Chathura Siriwardhana

15 February 2025 in EXPLORE
Verified
Journal Article
Open access
JCJudy Carlson
Judy Carlson
GRG․wEbster Ross
G․wEbster Ross
CTCaitlin Tyrrell
Caitlin Tyrrell
BFBelkys Fiame
Belkys Fiame
CNCourtnee Nunokawa
Courtnee Nunokawa
KSKim Schaper
Kim Schaper
The purpose of this study was to ascertain the impact infra-low-frequency neurofeedback (ILF NFB), a new paradigm in the field, has on post-concussive symptoms of headache, sleep and attention disorders experienced by combat Veterans. ILF NFB, a non-invasive integrative health intervention, has demonstrated clinical efficacy in treating several physical and psychological conditions, including headaches, dysregulated sleep, and attentional dysfunctions. Given that 20-40 % of combat Veterans who experienced concussions during recent military operations suffer chronically from these disorders, this study aims to determine whether ILF NFB might be an effective treatment option. Eighty-seven participants were enrolled in this randomized controlled trial, with 36 completing the intervention (Twenty 1/2-hour sessions of ILF NFB and 4 assessment sessions) and 38 completing the control procedures (8 weekly 15-minute health related discussions and 4 assessment sessions). Both groups continued treatment as usual throughout participation in study. Data were analyzed on intent to treat principle. Eighty-six percent of the participants were male and 14 % female, mean age was 45 for both groups. When comparing baseline to end of treatment measures, findings were clinically and statistically significant for headache (<0.0001), sleep (<0.0001) and attention (0.0022). Additional variables of interest were also significantly improved following ILF NFB, including quality of life (p < .0001), depressive symptoms (p < .0001), and symptoms of posttraumatic stress disorder (p = .0001). ILF NFB holds promise to be a safe and effective intervention for those who suffer with post-concussive symptoms of chronic headache, sleep, and attention disorders.