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Gastroenterology
Offers video consultation
22 years of experience
Inflammatory Bowel Diseases (IBD) such as ulcerative Colitis or Crohn's Disease, Pancreaticobiliary Medicine (Bile Ducts & Pancreas), Hepatology + 2more

Dr Chatu is a clinician with extensive experience in every aspect of gastroenterology, hepatology and general medicine. He is not only a clinician but also an academic. As an academic, he is an Honorary Senior Clinical Lecturer with King’s College London. As a clinician, he is a Consultant Gastroenterologist at King’s College Hospital. 

He was trained at the distinguished St Bartholomews and Royal London Medical School in London and completed his training in 2000. He received a variety of distinctions and prizes while he was on training due to his academic achievements. He completed a five-year specialist training programme in Gastroenterology & General Medicine at London Deanery, and obtained experience at various London Hospitals. Dr Chatu worked in Brisbane, Australia for one year to have additional clinical experience. He moved forward to complete a 3-year full-time higher research degree and earned M.D. Research at the University of London. His publications are in a number of high quality peer-reviewed international journals. He received a Medical Research Council grant and authored a successful textbook called ‘Hands-on Guide to Clinical Pharmacology’. It was a moment of honour when Dr Chatu presented his work on how to manage gastrointestinal cancer at The Houses of Parliament. 

Current memberships include the British Society of Gastroenterology, American Gastroenterological Association, British Medical Association and The Royal College of Physicians.

Dr Chatu is a down-to-earth and friendly professional who will listen to you and expertly guide you through your diagnostic and treatment options to determine a bespoke plan tailored to your individual needs. Furthermore, Dr Chatu has dual accreditation in general medicine and is an advanced life support instructor and always has a holistic approach.


Diseases, Medical Tests and Treatments

  • Diagnostic and therapeutic Gastroscopy
  • Diagnostic and therapeutic Colonoscopy
  • Oesophageal physiology tests (High Resolution Manometry, PH & Impedance, BRAVO)
  • Small bowel & colon video capsule endoscopy (to examine the small bowel & large bowel)
  • Insertion of feeding tubes: Percutaneous endoscopic gastrostomy (PEG)
  • Flexible sigmoidoscopy
  • Oesophageal stenting
  • Endoscopic mucosal resection of polyps 

Advanced Endoscopy: Diagnostic and therapeutic Gastroscopy and Colonoscopy;

Oesophageal Manometry, PH and Impedance testing 

Complex and simple gastroesophageal reflux disease; Swallowing problems; Achalasia, Barrett’s oesophagus; Nausea; Vomiting, Dyspepsia; Indigestion, Small intestinal bacterial overgrowth.

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Gastroenterology
26 years of experience
General (Internal) Medicine

Dr Clive Onnie is a Consultant Gastroenterologist at the Whittington Hospital NHS Trust since 1997. He qualified from The London Hospital Medical School with distinction and continued his postgraduate training at St Mark's Hospital and Guys and St Thomas Hospital. He undertook a Masters in Medical Science at the Hammersmith hospital and obtained his PhD from Kings College, London, studying the genetics of inflammatory bowel disease. He was awarded a Digestive Diseases Foundation Research Fellowship. Dr Onnie is also Honorary Senior Lecturer at the University College London Medical School and the medical adviser to the North London Chapter of the Crohn's and Colitis UK Organisation.

Dr Onnie sees patients with all aspects of general gastroenterology conditions. He is an expert in the management of inflammatory bowel disease, irritable bowel syndrome, dyspepsia and reflux. He applies a holistic approach to the treatment of bowel problems, combining conventional and alternative medicine with particular emphasis on the importance of diet. 

Dr Onnie is actively involved in research and is particularly focused on the genetics of inflammatory bowel disease and colorectal cancer. He has published extensively in some of the most renowned medical journals and has also co-authored several book chapters. 

 

 

 

 

 

 

 


Diseases, Medical Tests and Treatments
  • Gastroscopy OGD
  • Colonoscopy
  • Flexible sigmoidoscopy
  • ERCP
  • Video capsule endoscopy
  • Irritable Bowel Syndrome (IBS)
  • Inflammatory Bowel Disease (IBD)
  • Reflux
  • Dyspepsia
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Gastroenterology
Offers video consultation
Recommended by 1 specialist
21 years of experience
Irritable Bowel Syndrome (IBS), Neuro-Gastroenterology

*Dr Zeki offers consultations via Skype and telephone at convenient times. Please send a message to arrange*

Dr. Sebastian Zeki is a gastroenterologist at St Thomas' Hospital in London one of the country's leading tertiary referral centres. He is also a senior clinical lecturer at Kings College University and Barts cancer institute.

He prioritises making the patient experience of gastroenterology as comfortable as possible whilst resolving symptoms and illnesses as quickly. He sees patients with a wide range of conditions, making certain that the patient is at ease when explaining their symptoms and is attentive to the wider impact that a patient's illness is having on their life.

Dr. Zeki qualified in medicine from Cambridge University and University College London in 2001. He undertook his postgraduate medical training in London during which time he also completed a PhD on the genomics of oesophageal cancer, under Professor Sir Nicholas Wright and Dr Stuart Macdonald. This was recognised and presented at national and international meetings and recognised with several prizes from British, European and American Gastroenterological Societies. He subsequently completed further clinical training alongside postdoctoral research at Addenbrooke's Hospital and the Medical Research Council Hutchison laboratory, Cambridge and Jikei University Hospital, Tokyo.

Dr Zeki's extensive experience has given him a unique skill set in the detection, accurate diagnosis and therapy of a number of gastroenterological complaints from reflux to performing endoscopic cancer resections.

His main research interests include upper gastrointestinal cancer (stomach and oesophagus) diagnosis and therapy as well as the detection of their precursors. He also has an active clinical and research interest in food allergies and their effect on the gut encompassing conditions such as eosinophilic oesophagitis as well as movement disorders of the oesophagus and acid reflux related conditions.

Special Interests

Heartburn; chest pain; indigestion; bloating; dyspepsia; irritable bowel syndrome; swallowing disorders; hoarse voice; chronic cough and throat clearing; endoscopic cancer diagnosis and resection; Barrett's oesophagus; gastric cancer screening; high quality endoscopy; food allergies; spastic disorders of the gut


Diseases, Medical Tests and Treatments

  • Upper Gastrointestinal Endoscopy
  • Therapeutic Endoscopy
  • Radiofrequency ablation
  • Endoscopic mucosal resection
  • Endoscopic submucosal resection 
  • Stricture dilatation
  • Gatrointestinal Cancers
  • Oesophageal Cancer
  • Barrett’s Oesophagus
  • Eosinophilic Oesophagitis
  • Gastroesophageal Reflux Disease
  • Dysphagia
  • Dysmotility
  • Achalasia
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Gastroenterology
Recommended by 3 specialists
22 years of experience
Inflammatory Bowel Diseases (IBD) such as ulcerative Colitis or Crohn's Disease, Irritable Bowel Syndrome (IBS)

Dr Aathavan Loganayagam trained in medicine at Guy’s, King's and St. Thomas’ medical schools. He then underwent rigorous structured specialty training in gastroenterology and general internal medicine in the well respected South London training programme.
He then spent two years during postgraduate training as a research and endoscopy fellow at Guy’s and St Thomas’ Hospitals, London. His research was in the fields of pharmacogenetics, inflammatory bowel disease and gastrointestinal malignancy. He has received awards and grants for outstanding research work, including the prestigious NHS Innovation London Award.
Dr Loganayagam has numerous publications in peer reviewed journals on all aspects of gastroenterology. He is actively involved in clinical research. He has particular local expertise in the practice of personalised medicine and the utilisation of novel therapeutic agents in the treatment of complex inflammatory bowel disease. He is currently the lead clinician for endoscopy at Queen Elizabeth Hospital, Woolwich.
Diagnostic and advanced therapeutic endoscopy remains a major part of his clinical expertise, including assessment and treatment of inflammatory bowel disease, strictures, polyps and cancers.
Dr Loganayagam is an approachable doctor who takes pride in his communication skills with patients. He is keen to ensure that patients are fully informed and involved in all aspects of their care. 


Diseases, Medical Tests and Treatments

Polypectomy

Endoscopic mucosal resection (EMR)

Breath Testing

Oesophageal manometry

Therapeutic endoscopy

Colonoscopy

Upper GI endoscopy

Diagnostic and therapeutic endoscopy

Diagnosis and screening or surveillance of gastrointestinal cancers

Inflammatory Bowel disease (IBD)

Bowel/colorectal cancer

Pancreatic cancer

Stomach/gastric cancer

Oesophageal cancer

Anaemia

Bacterial overgrowth/Intestinal Dysbiosis

Food tolerances/allergy

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General Surgery
Offers video consultation
37 years of experience
Laparoscopic (Key-Hole) Surgery, Upper GI (Gastrointestinal) Surgery, Hepatobiliary & Pancreatic Surgery

Professor Ameet Patel is a Consultant HPB/Liver Surgeon, appointed as Consultant Surgeon at King's College Hospital in 1999, developing one of London’s leading Bariatric Centres in the last 10 years, continuing to push the boundaries of day case surgery and Single Incisional Laparoscopic Surgery (SILS) as a new technique of minimal access surgery.

Professor Patel qualified from St George's Hospital, London in 1985, training in Surgery in the UK (London, Norwich and Cambridge) with a Fellowship in Minimal Access, HPB, Upper GI and Bariatric Surgery in Australia and a Research Fellowship in Pancreatic Surgery at University College, Los Angeles, USA with Professor Howard Reber. 

Professor Patel has also been invited to perform live surgical demonstrations and present at National and International conferences.


Diseases, Medical Tests and Treatments

  • Laparoscopic (keyhole) surgery
  • Innovative minimal access techniques
  • Single incision surgery
  • Mini laparoscopy
  • Liver resections
  • Pancreatic resections
  • Biliary resections
  • Cholesytectomy
  • Fundoplication
  • Gastric band insertion
  • Gastric resections
  • Splenectomy
  • Gastric bands
  • Gastric Bypass
  • Gastric Sleeve
  • Revision surgery
  • Endobarrier
  • Hepatobiliary
  • Upper GI surgery
  • Weight Loss Surgery


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General Surgery
Offers video consultation
Recommended by 1 specialist
28 years of experience
Laparoscopic (Key-Hole) Surgery, Upper GI (Gastrointestinal) Surgery

Mr Khaled Dawas is Head of the UGI Surgery Service at University College London Hospitals (UCLH) and an Honorary Clinical Lecturer at University College London.

He was awarded his medical degree at the University of Cambridge in 1994. He trained as a General Surgeon in London and Oxford. Subspecialisation in Upper GI Surgery was then honed in Oxford, Birmingham and Australia, qualifying as a Consultant Surgeon in 2007. During his training, Mr Dawas completed a fellowship in Perth, Australia where he dedicated a significant amount of time to perfecting his laparoscopic “keyhole” surgical skills.

Since his appointment, Mr Dawas has contributed significantly to building and improving the Upper Gastrointestinal Services at UCLH. It is now one of the larger units inthe UK. His specialist interest lies in the diagnosis and surgical treatment of cancer of the stomach and oesophagus as well as the surgical treatment of hiatus hernias and acid reflux. His surgery data is available on the national NOGCA database. He is also a specialist in the surgical management of gallstones and hernias through open and “keyhole” surgery. On the endoscopy front, Mr Dawas provides routine endoscopy as well as advanced nutrition access eg PEG.

Mr Dawas is an expereinced teacher and mentor. He holds a position as an Honorary Clinical Lecturer at UCL where he furthers his academic interests. He regularly teaches medical students and is a supervisor for surgical trainees at all levels of training. He has been described by his junior doctors as“an inspirational mentor”. He chairs the UCLH GI Surgery Eduational Forum.

In his private practice, he ensures all his patients’ questions are answered. He believes in tailored patient plans and has a flexible appointment system in Harley Street and Chelsea. He strives to give his patients as much data and information to help them make an informed decision about their treatment.

If you can’t find him in the operating room you will probably find him swimming, running or cycling.


Diseases, Medical Tests and Treatments

Gall bladder removal (cholecystectomy)

Hernia repair

Oesophagus cancer surgery (Oesophagectomy)

Stomach cancer surgery (gastrectomy)

Endoscopy

Upper-gastrointestinal disease

Hernia repair (laparoscopic and open)

Gall bladder surgery

Acid Reflux surgery

Achalasia surgery

Cancer of the stomach

Cancer of the oesophagus

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General Surgery
23 years of experience
Colorectal Surgery, Laparoscopic (Key-Hole) Surgery

Mr Efthymios Ypsilantis is a Consultant General Surgeon with an interest in Laparoscopic and Colorectal Surgery. His NHS practice is based at King’s College Hospital NHS Foundation Trust - Princess Royal University Hospital site in Orpington, while he also sees private patients at BMI The Sloane Hospital in Beckenham, BMI Chelsfield Park Hospital in Orpington and at BMI The Blackheath Hospital in Blackheath. 

Mr Ypsilantis qualified from the Medical School of Athens, Greece in 1999. He completed his Core Surgical Training in the East of England and became a Member of the Royal College of Surgeons of England in 2006. He completed his research at the University of Cambridge and was awarded an MPhil in Surgery in 2007. He trained in the Eastern Deanery and London Deanery Higher Surgical Training National Programs and was admitted as a Fellow of the Royal College of Surgeons of England in 2014, gaining the Certificate of Completion of Training (CCT) in General Surgery in 2015. 

He consolidated his surgical and laparoscopic experience in the treatment of gastrointestinal disease during training at King’s College Hospital, Medway Hospital and Guy’s and St. Thomas’ Hospitals. He undertook a Post-CCT Fellowship (RSO) at St Mark’s Hospital in 2016, further expanding his experience and skills in the treatment of colorectal cancer, inflammatory bowel disease, pelvic floor diseases, intestinal failure and complex abdominal surgery. 

He was the ACPGBI Travelling Fellow at the Memorial Sloan-Kettering Cancer Centre in New York, USA, in 2015. He is accredited by JAG for diagnostic and therapeutic endoscopy. His academic qualifications also include a Master's of Science (MSc) Degree in Perioperative Care (Cardiff University, 2006) and a Master's of Surgery (MS) in Coloproctology (University of East Anglia, 2016). He was admitted as a Fellow of the European Board of Coloproctology after succeeding in the EBSQ examinations in 2017. 

He is a member of the Association of Coloproctology of Great Britain and Ireland, the European Society of Coloproctology and the Royal Society of Medicine. He has published extensively in peer-review journals, textbooks and has presented many papers in international conferences. He is a keen trainer and holds the roles of Training Faculty Lead and the College Tutor on behalf of the Royal College of Surgeons of England. 


Diseases, Medical Tests and Treatments

  • Abdominal Wall Reconstruction
  • Abdominoperineal Resection
  • Anal Fissure Treatment
  • Appendicectomy
  • Botox for Anal Fissure
  • Bowel Diversion Surgery
  • Bowel Surgery (Colectomy)
  • Colonoscopy
  • Coloproctology
  • Colorectal Surgery
  • Fistula Surgery
  • Haemorrhoid Surgery
  • Laparoscopy
  • Open Hernia Repair
  • Pilonidal Sinus Surgery
  • Polypectomy
  • Removal Of Rectum And Colon (Proctocolectomy)
  • Skin Lesion Removal
  • Skin Lesion Removal
  • Skin Lesion Treatments
  • Skin Lesion Treatments
  • Stoma
  • THD
  • Anal Fistula
  • Bowel Obstruction
  • Constipation
  • Crohn’s Disease
  • Diarrhoea
  • Diverticulitis
  • Faecal Incontinence
  • Femoral Hernia
  • Haemorrhoids
  • Hernia
  • Inguinal Hernia
  • Obstructive Defaecation
  • Pilonidal Sinus Disorders
  • Pilonidal Sinus Disorders
  • Rectal Bleeding


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Gastroenterology
18 years of experience
General (Internal) Medicine, Hepatology, Inflammatory Bowel Diseases (IBD) such as ulcerative Colitis or Crohn's Disease + 1more

Dr. Arun Rajendran is a Consultant Gastroenterologist with over a decade of experience in the treatment and management of gastroenterological issues, including inflammatory bowel disease, reflux, and irritable bowels syndrome. He sees private patients at the BMI Clementine Churchill Hospital.

He graduated in 2001 and completed his postgraduate specialist gastroenterology training in North West London. He spent 3 years in St Marks Hospital for his postgraduate research and teaching fellowship. He was awarded a research MD from Kings College London (2020) following the submission of his thesis examining the learning curve of colonoscopic polypectomy. He has peer reviewed publications arising from this research and has been awarded the 2016 NIHR CLAHRC support award, 2016 ASGE Cook Medical Marsha Dreyer Award and 2016 BSG best teaching abstract award. He has also presented his work in both national and international meetings.


He completed his PG certificate in Medical Education in 2015 leading to the accreditation to the Higher Education academy (FHEA) in 2017. He maintains an active research and teaching interest as Senior Clinical Teacher (Imperial College, London) and continues to peer review articles for international journals, contribute to research by recruiting patients for clinical trials, present in national and international meetings on topics of cancer screening, training, inflammatory bowel disease. He regularly contributes nationally and internationally as multidisciplinary working group member for improving quality of endoscopy training


Dr Rajendran was appointed as a full-time substantive consultant in Gastroenterology and General Internal Medicine at Hillingdon Hospital NHS Foundation Trust in 2018. He is the Endoscopy Training Lead for the Trust. He offers outpatient and interventional endoscopy services at both Hillingdon and Mount Vernon Hospitals in addition to seeing patients with a full range of gastroenterology, general hepatology and Inflammatory bowel disease in his NHS practice. He also covers emergency cases at Harefield Hospital.


He is well versed in English, Hindi, Tamil and Kannada.

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Gastroenterology
Offers video consultation
25 years of experience
Hepatology, Inflammatory Bowel Diseases (IBD) such as ulcerative Colitis or Crohn's Disease, Irritable Bowel Syndrome (IBS) + 1more

Dr Michael Chapman is a Consultant Gastroenterologist and Hepatologist with specialist interests in Pancreaticobiliary medicine, Hepatology, Interventional Endoscopy. As well as a broad interest in most areas of gastroenterology, he has a particular interest in conditions of the liver and pancreas, with an expertise in performing general endoscopy and complex ERCP including pancreatic endotherapy and SpyGlass Cholangioscopy for strictures and complex gallstone disease.

Dr Chapman qualified in 1997 from UCL Medical School, completing his specialist training in London.


Diseases, Medical Tests and Treatments

  • Endoscopy
  • Endoscopic Retrograde Cholangiopancreatography (ERCP)
  • Duodenal polyp EMR
  • Cholangioscopy
  • Duodenal and colonic stent
  • Venesection
  • General gastroenterology
  • Hepatology
  • HPB medicine
  • Abdominal pain
  • PSC
  • PBC
  • Gastroenteritis
  • Pancreatic cancer
  • Cholangiocarcinoma
  • Liver disease
  • Hepatitis
  • Jaundice
  • Acute pancreatitis
  • Chronic pancreatitis
  • Gallstones
  • Diarrhoea
  • Abdominal pain
  • Diarrhoea
  • Indigestion
  • Dyspepsia
  • Constipation
  • Irritable bowel syndrome (IBS)
  • Inflammatory bowel disease (IBD)
  • Heartburn
  • Acid reflux
  • Haemochromatosis

It is important that HCA is transparent about our relationship with those doctors who provide us with clinical guidance on delivering the best possible care to patients and operating our hospitals safely and efficiently. We set out here some of the ways in which we work together and the amount we pay this doctor for such services.

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Gastroenterology
29 years of experience
Inflammatory Bowel Diseases (IBD) such as ulcerative Colitis or Crohn's Disease, Irritable Bowel Syndrome (IBS)

James Lindsay is the Professor of Inflammatory Bowel Disease and a Consultant Gastroenterologist. He studied medicine at the Universities of Cambridge and Oxford and qualified in 1993. He completed his PhD in mucosal immunology at Imperial College London. His NHS base is Barts Health NHS Trust and he also holds an academic position at Barts and the London School of Medicine and Dentistry, Queen Mary University of London. Along with a full multidisciplinary team he runs the adolescent and adult IBD service at The Royal London Hospital as well as a private clinic at the London Digestive Centre. He performs endoscopy and colonoscopy at the Princess Grace Hospital and is an accredited bowel cancer screening colonoscopist.  

He is a past Education Officer and Governing Board Member of the European Crohn’s and Colitis Organisation (ECCO). He has chaired working groups for the ECCO consensus on the management of Crohn’s disease and ulcerative colitis. He is the British Society of Gastroenterology (BSG) national societies representative to United European Gastroenterology and is a member of the International Organisation of IBD (IOIBD).

Professor Lindsay serves on the BSG IBD Clinical Trials Steering Group and is Chief Investigator for a series of investigator-led and commercial clinical trials in IBD. In addition, he leads a program of translational science research.



Diseases, Medical Tests and Treatments
  • General Gastroenterology
  • IBD
  • Gastroscopy OGD
  • Colonoscopy
  • Flexible sigmoidoscopy
  • Crohn's disease
  • Ulcerative colitis
  • Endoscopy
  • General Gastroenterology
  • IBD
  • Gastroscopy OGD
  • Colonoscopy
  • Flexible sigmoidoscopy
  • Crohn's disease
  • Ulcerative colitis
  • Endoscopy
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