Bradycardia Clinical Trial
Official title:
Reduction Or Elimination Of Radiation During Implantation of Cardiac Devices Using Ultrasound (RADICAl USe)
Specialized equipment is required to put pacemakers in the heart. This requires use of radiation to see the wires or leads being implanted in the heart. Repeated radiation use can result in permanent injury to the patient and to the doctor. The investigators aim to investigate if they can use ultrasound to guide and help in the implantation of leads into the heart. Ultrasound is a safe method and requires only a small handheld probe and a small screen to see different structures in the heart. If ultrasounds proves successful as a tool to reduce radiation then this would be very useful technical breakthrough. It would help develop smaller centres where pacemakers can be implanted without purchasing xray equipment and expensive setups.
Radiation quantity used in medicine is expanding year on year with increasing clinical uses for medical illnesses and to visualize instruments being used during procedures such as cardiac devices including pacemakers. The effects of radiation are not only on the patients for their procedure but also a cumulative effect of radiation on the operators. The stochastic effects of radiation have been well reported in the literature. Advancing technologies such as 3-dimensional(3D) mapping systems have allowed for leads to be identified using a 3D matrix and safely deployed to the myocardium. However, there are significant costs associated with the use of 3D mapping systems resulting in this approach not being widely adopted. Ultrasound use during implantation of cardiac implantable electronic devices (CIED) has been utilized in the past to gain vascular access via the axillary vein with good safety results. Experimental studies to visualize leads in the heart and venous systems using 3D ultrasound showed optimism but has not translated to clinical use due to lack of technology to improve the spatial and temporal resolution. The technology in imaging resolution has improved over the last 5 years and likely can be used to visualize a pacing lead in the heart. Techniques such as intravascular cardiac ultrasound have been used to assist in implanting lead via coronary sinus in individuals who can have contrast allergies. Therefore, transthoracic echocardiogram and ultrasound should be now of sufficient quality to allow for successful pacemaker insertion. To date, there has not been a feasibility study to evaluate complete ultrasound and echocardiography-assisted pacemaker insertion. In this study, the investigators aim to utilize ultrasound and echocardiography to gain vascular access and to direct the pacing lead into the right ventricle to allow for safe pacemaker implantation. If this is successful, then this will allow for a larger study to be conducted for single chamber devices including implantable cardioverter defibrillators. Moreover, the investigators will be able to analyze the cost-effectiveness of this new technique compared to the conventional technique of pacemaker implantation. ;
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