Clinical Trials Logo

Clinical Trial Summary

Obesity, rheumatoid arthritis (RA) and gene-specific dilated cardiomyopathy (DCM) are common medical conditions. Small-scale studies have shown that these are associated with proarrhythmic changes on 12-lead electrocardiogram (ECG) and a higher risk of sudden cardiac death (SCD). However, these studies lack the deep electrophysiological phenotyping required to explain their observations. Electrocardiographic imaging (ECGi) is a non-invasive alternative to 12-lead ECG, by which epicardial potentials, electrograms and activation sequences can be recorded to study adverse electrophysiological modelling in greater depth and on a more focussed, subject-specific scale. Therefore, this study proposes to better define the risk of arrhythmia and understand the underlying adverse electrophysiological remodelling conferring this risk in three groups (obesity, RA and DCM). Firstly, data from two large, national repositories will be analysed to identify associations between routine clinical biomarkers and proarrhythmic 12-lead ECG parameters, to confirm adverse electrophysiological remodelling and a higher risk of arrhythmia. Secondly,ECGi will be performed before and after planned clinical intervention in obese and RA patients, and at baseline in titin-truncating variant (TTNtv)-positive and -negative DCM patients, to characterise the specific and potentially reversible conduction and repolarisation abnormalities that may underlie increased arrhythmic risk.

Clinical Trial Description

Sudden cardiac death (SCD) occurs in groups that are neither traditionally considered high-risk nor have been the subject of large-scale studies. These include obesity, inflammatory arthropathy and gene-specific cardiomyopathy. Existing data to explain higher risk of arrhythmia in these cohorts rely on 12-lead ECG and therefore lack in-depth electrophysiological phenotyping. The investigators have access to the two large national data repositories providing a wealth of data to study risks of arrhythmia on a scale larger than any previously published study. They also have a proven track record of utilising electrocardiographic imaging (ECGi) to conduct in-depth investigation of electrophysiological remodelling to better characterise arrhythmic risk.

ECGi is a validated, noninvasive method of acquiring body surface potential data using 252-electrodes and combining it with subjectspecific heart-torso geometry from crosssectional imaging. Using inverse solution mathematical algorithms, the ECGi system reconstructs epicardial unipolar electrograms and panoramic activation and potential maps over a single sinus beat, which is visualised on a digitised image of the subject's heart. Various studies have demonstrated the efficacy of ECGi to localise ventricular arrhythmias; more accurately calculate QT interval dispersion than 12-lead ECGs in obesity; and characterise ventricular tachycardia (VT) with intramural re-entry following myocardial infarction-induced scarring.

The study aims to confirm that obesity, RA and DCM are risk factors for arrhythmia and associated with electrophysiological remodelling manifest on 12-lead ECG, using large data repositories. The investigators will also perform electrocardiographic imaging (ECGi) to investigate and understand specific, and potentially reversible, conduction and repolarisation abnormalities conferring risk of arrhythmia in these cohorts using ECGi.


1. Routine clinical biomarkers correlate with proarrhythmic 12-lead ECG parameters

2. Adverse (proarrhythmic) electrophysiological remodelling can be quantified with ECGi

3. Bariatric surgery reverses adverse electrophysiological remodelling in obesity

4. Pharmacological therapy reverses adverse electrophysiological remodelling in RA

5. TTNtv is associated with adverse electrophysiological remodelling in DCM

In-keeping with hypothesis 1, the study population will include participants from the UK biobank and Airwave Health Monitoring Study in which risk of arrhythmia will be defined. Participants in both data repositories provided informed consent for their data to be used for research.

With respect to hypotheses 2-5, the study will involve 3 distinct ECGi sub-studies, each in a well-defined cohort to identify specific, and potentially reversible, conduction and repolarisation abnormalities, and comparing the disease to healthy controls. These are:

i. Obesity (BMI >40) ii. RA iii. TTNtv-positive and -negative DCM ;

Study Design

Related Conditions & MeSH terms

NCT number NCT03910725
Study type Observational
Source Imperial College London
Contact Fu Siong Ng, BSc MRCP PhD
Phone +442075943614
Status Not yet recruiting
Start date May 1, 2019
Completion date December 31, 2021

See also
  Status Clinical Trial Phase
Recruiting NCT03640442 - Modified Ramped Position for Intubation of Obese Females. N/A
Recruiting NCT03042897 - Exercise and Diet Intervention in Promoting Weight Loss in Obese Patients With Stage I Endometrial Cancer N/A
Completed NCT03644524 - Heat Therapy and Cardiometabolic Health in Obese Women N/A
Recruiting NCT03227575 - Effects of Brisk Walking and Regular Intensity Exercise Interventions on Glycemic Control N/A
Recruiting NCT01870947 - Assisted Exercise in Obese Endometrial Cancer Patients N/A
Recruiting NCT03652987 - Endocrine and Menstrual Disturbances in Women With Polycystic Ovary Syndrome (PCOS)
Recruiting NCT03714646 - Beta Glucan and Acetate Production N/A
Recruiting NCT03255005 - Endomina Controlled Study N/A
Enrolling by invitation NCT03063606 - Behavioral and Pharmacologic Treatment of Binge Eating and Obesity: Specialist Treatment Phase 2/Phase 3
Terminated NCT03299881 - Safety and Effectiveness of Transcutaneous Electrical Nerve Stimulation (TENS)-Assisted Weight Loss N/A
Completed NCT03317587 - Inspiring Nutritious Selections and Positive Intentions Regarding Eating and Exercise (INSPIRE) N/A
Active, not recruiting NCT02558920 - Meta-analyses of Food Sources of Fructose-Containing Sugars and Obesity
Active, not recruiting NCT03610958 - Safety and Performance Evaluation of the Epitomee Device for Enhancing Satiety and Weight Loss. N/A
Completed NCT02235961 - Investigate Safety, Tolerability and Pharmacokinetics for Single Doses of NNC9204-0530 Alone and in Combination With Liraglutide in Overweight to Obese But Otherwise Healthy Male Subjects Phase 1
Completed NCT03195712 - Metabolically Healthy Obesity: Correlations Between BMI and Metabolic Syndrome Biomarkers N/A
Completed NCT00341406 - Fat Cell Size in Insulin Resistance
Recruiting NCT03678766 - CHARGE: Controlling Hunger and ReGulating Eating N/A
Not yet recruiting NCT03470272 - Effects of Red Light LED Therapy on Body Contouring N/A
Recruiting NCT03821961 - 18F-FDOPA PET/CT Imaging in Patients Undergoing Metabolic Surgery N/A
Recruiting NCT03627104 - Effect of Dietary Protein and Energy Restriction in the Improvement of Insulin Resistance in Subjects With Obesity N/A