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As the market for leadless pacemakers grows in India, doctors point out definite advantages of the technology for heart disease patients but also call for more data and analyses on its long-term effects. At the same time, researchers have written about the lack of a national registry tracking pacemaker implants, including conventional ones. A pacemaker helps a heart patient control an irregular heartbeat. In November, Abbott, the US-based healthcare and medical devices company, introduced the AVEIR VR single-chamber ventricular leadless pacemaker in India for treating patients having slow heart rhythms. The device has been approved by the Central Drugs Standard Control Organization, Abbott said in a statement. The AVEIR VR device is implanted directly into the heart's right lower chamber (ventricle) through a "minimally invasive, catheter-based procedure from the groin", thereby requiring no surgical cuts to the chest or wires, it said. Doctors consider a 'leadless' pacemaker an