India, Dec. 25 -- A 58-year-old marathon runner who had suffered multiple sudden collapses recently underwent a rare dual-chamber pacemaker implantation at Paras Health in Gurugram, with doctors describing it as "North India's first such procedure for this condition."

Doctors said the patient, despite being physically fit and having no known heart disease, was diagnosed with a rare and previously undetected cardiac electrical disorder that posed a serious life-threatening risk. The patient had experienced repeated episodes of sudden loss of consciousness, including collapses at his workplace.

Dr Amit Bhushan, director - cardiology at Paras Health, Gurugram, said the unexplained nature of the collapses led doctors to suspect an electrica...