None listed
Conditions
Brief summary
Patients with suspected heart rhythm disorders or syncope are often offered insertable cardiac monitors (ICM) for prolonged cardiac rhythm monitoring. Early models required surgical implantation (larger incision, more complicated implant tools) which limited acceptance by physicians and patients. Improved technology allowed miniaturization of ICM size and a simplified insertion method with an “injectable” tool which has increased acceptance. One manufacturer's recommended insertion position for ICM spans the V2–V3 electrocardiogram (ECG) electrode location in an oblique 45 degree angle, although data supporting this recommendation for adequate cardiac sensing is limited to R-wave signal analysis only. We will analyze non-invasive surface ECG recordings from healthy participants to measure the P-wave signal seen at the manufacturer's recommended insertion point and in other locations to find the optimal location for p-wave visualisation.
Interventions
Surface electrocardiogram (ECG) recordings will be obtained using a holter monitor from participants in sinus rhythm. Holter monitor ECG is a normal routine practice for patients with heart rhythm disorders.
Participants will have ECG electrodes attached to the chest to allow recording of heart signals. This will be performed by trained cardiology technicians of the research team. ECG strips will be obtained from a specific set of vectors at the standard precordial V2/V3 electrode position of a
Surface electrocardiogram (ECG) recordings will be obtained using a holter monitor from participants in sinus rhythm. Holter monitor ECG is a normal routine practice for patients with heart rhythm disorders. Participants will have ECG electrodes attached to the chest to allow recording of heart signals. This will be performed by trained cardiology technicians of the research team. ECG strips will be obtained from a specific set of vectors at the standard precordial V2/V3 electrode position of a 12-lead ECG. The vector will be varied by (1st) inter-electrode lengths {45mm vs 75mm}, (2nd) vector orientation {vertical vs oblique 45 degrees from vertical vs oblique 75 degrees from vertical}, (3rd) intercontercostal spacing {normal V2/V3 position vs one intercostal space superior}. Recordings will last 30 seconds each. Recordings for all vectors should be obtained from each participants and the entire observation will last up to 10 minutes on only a single occasion. Each ECG strip will be analyzed offline and compared for p-wave amplitude by caliper measurement.
Sponsors
Dr Dennis Lau
Study design
Allocation
Non-randomised trial
Primary purpose
Diagnosis
Eligibility
Sex/Gender
All
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
• Participant must be in sinus rhythm (cardiology inpatients will have telemetry ward monitoring to allow rhythm identification for inclusion). • Cardiac situs solitus. • Greater than or equal to 18 years of age. • Able to provide consent.
Exclusion criteria
• Unable to provide written informed consent to participate in this study. • Participating in another clinical research trial which prevents acquisition of surface ECG. • Cardiac situs inversus or other abnormal cardiac gross displacement. • Participant not in sinus rhythm. • Known allergic reaction to ECG electrode dots.
Outcome results
None listed