• Clinical Medicine
• Gastroenterology & Hepatology

• Inflammatory bowel disease
• Irritable bowel disease
• Nutrition
• Non-alcoholic fatty liver disease
• Cirrhosis
• Hepatobiliary

Research and Publications

• Menon S, Jayasena H, Nightingale P, Trudgill N. Influence of age and sex on endoscopic findings of gastro oesophageal reflux disease: an endoscopy database study. European Journal of Gastroenterology and Hepatology. 2011: 23(5):389-95
• Shepherd S, McGuire ND, de Lacy Costello B, Ewen R, Jayasena DH, Vaughan K, Ahmed I, Probert CSJ and Ratcliffe NM. The use of a gas chromatograph coupled to a metal oxide sensor for rapid assessment of stool samples from irritable bowel syndrome and inflammatory bowel disease patients. Journal of Breath Research. 2014; 8 (2). ISSN 1752-7155 
• Aggio RB, White P, Jayasena H, de Lacy Costello B, Ratcliffe NM, Probert CS. Irritable bowel syndrome and active inflammatory bowel disease diagnosed by faecal gas analysis. Aliment Pharmacol Ther. 2017 Jan;45(1):82-90
• Jayasena H, Chinthaka W. COVID-19 and developing countries: lessons learnt from the Sri Lankan experience. J R Soc Med. 2020 Nov;113(11):464-465
• Jayasena H, Abeynayake D, De Silva A, Niriella M, de Silva HJ. The use of personal protective equipment in endoscopy: what should the endoscopist wear during a pandemic? Expert Rev Gastroenterol Hepatol. 2021 Dec;15(12):1349-1359
• Niriella MA, Jayasena H, Withanage M, Devanarayana NM, De Silva AP. Chronic nausea and vomiting: a diagnostic approach. Expert Rev Gastroenterol Hepatol. 2022 Apr;16(4):311-320
• Govindapala D, Nakkawita D, Jayasena H, Jayasekera PMMPT, Navaratne V, Abeygoonawardena H, Kawayangana P, Gamage A, De Silva AD. A multicentre study on quarantined healthcare workers during the first wave of COVID-19 pandemic: Lessons learned in a resource limited setting. Journal of Ceylon College of Physicians. 2022 June; 53 (1):26
• de Silva AP, Niriella MA, Nishad N, Jayasundara H, Jayasena H, Samarawickrama VT, Ranawaka C, Basnayake K, de Silva ST, de Silva HJ. Splenic Stiffness Measurement Combined With Liver Stiffness Measurement Compared With Baveno VII Criteria in Predicting the Presence of Oesophageal and Gastric Varices in Patients With Compensated Advanced Liver Cell Disease (cALCD). Cureus. 2024 Aug 1;16(8):e65954.
• Niriella MA, Jayasena H, Withanachchi A, Premawardhena A. Mistakes in the management of iron deficiency anaemia: a narrative review. Hematology. 2024 Dec;29(1):2387987.
  
  Doctoral study:
• Volatile organic compounds and Lactoferrin as non-invasive biomarkers in inflammatory bowel disease
  Date, Supervisor: Aug 2010 - Sep 2013, Prof Chris Probert, Consultant Gastroenterologist, Bristol Royal Infirmary. Thesis published: 2013, University of Bristol, UK

Presentations
Poster presentation

• The shift in aetiology of cirrhosis in a lower-middle income country in Southeast Asia over a decade –- a single centre study from Sri Lanka. Presented at Annual Sessions of Sri Lanka Society of Gastroenterology 2024. Awarded the best poster award.
• Pancreatogram findings among patients who have undergone ERCP in Tertiary care centre in Sri Lanka. Presented at Asian Pacific Association for the study of the liver (APASL) annual meeting in Taiwan in Feb 2023
• Poster presentations at the annual meeting of the Clinical Society of Sri Jayewardhanapura General Hospital, December 2017
  The following posters were presented: 
  a. Use of Inferior Vena Cava Measurements in assessment of fluid status in Dengue Haemorrhagic Fever
  b. Misuse of Methotrexate leading to toxicity
  c. An interesting case of Overlap Syndrome
  d. Transient loss of consciousness due to Pulmonary Embolism secondary to antiphospholipid syndrome
• Diagnostic potential of volatile organic compounds as faecal biomarkers in inflammatory bowel disease
  Awarded best poster in Gastroenterology - Annual meeting of the British Society of Gastroenterology, UK (June 2013)
• Efficacy of Faecal Lactoferrin in IBD and IBS: a comparative study. Poster presentation at the annual meeting of the British Society of Gastroenterology, UK (July 2012)
• A descriptive study on the disease pattern of malignant otitis externa presenting to a tertiary care referral centre in Sri Lanka. Sri Lanka Medical Association Annual Scientific Session 2005, Sri Lanka

Oral presentations

• “ GERD : Answers to all of your burning questions” at Sri Lanka Society of Gastroenterology Annual Academic Sessions October 2024.  
• “ A difficult case of post transplant rejection” at Colombo North Centre for Liver Disease Lecture series for Medical Practitioners – August 2021
• “Management of a patient with cirrhosis on the transplant wait list” at Colombo North Centre for Liver Disease Lecture series for Medical Practitioners – May 2021
• “COVID-19 and the GI tract – more than meets the eye” at the Young Physicians Forum of Ceylon College of Physicians, Colombo Sri Lanka - Jan 2021
• “Palliative Medicine Care in Nephrology” at the Workshop in Palliative Medicine in Nephrology & Gastroenterology at Ceylon College of Physicians Annual Meeting 13th September 2018, held in Colombo Sri Lanka
• “Diagnostic potential of volatile organic compounds as urine biomarkers in inflammatory bowel disease.”
  Scientists in Gastroenterology symposium at British Society of Gastroenterologists, Annual Meeting 27th June 2013, held in Glasgow, United Kingdom
• “The future of alternative medicine in the hands of future doctors”: Winning essay and Opening speech at the World congress of Alternative Medicine, December 30th 2000, held in Colombo, Sri Lanka.

Other Publications

• Best of five MCQs for the Gastroenterology SCE :
  By Oxford University Press
  Chapter 1, Upper Gastrointestinal tract disorders
• British Society of Gastroenterology annual session - GUT magazine April 2012
  Lactoferrin as a faecal biomarker in inflammatory bowel disease
• British Society of Gastroenterology annual session - GUT magazine July 2013
  1) Volatile organic compounds as faecal biomarkers in inflammatory bowel disease
  2) Volatile organic compounds as urinary biomarkers in inflammatory bowel disease
• Get Ahead of Medicine: 150 EMQs for Finals
  By CRC Press
  Editor: Dr H Jayasena
  Awaiting publication

• Shire innovation research: Specialist Registrar grant award, UK 2011 
  Awarded for research into non-invasive faecal and urinary biomarkers in Inflammatory bowel disease. Grant awarded by Shire pharma £3000
• MERIT award at Young Physicians Forum, Ceylon College of Physicians 2021

• Director ,
  People In Need Foundation,
  Boossa, Sri Lanka

• International Research Conference 2015: FOM Coordinator Jan –Aug 2015
• Elective Program Co-Ordinator from 2024 to present