AS a leading Cardiologist of  India , Dr Nigam has served the nation with utmost sincerity and dedication, both as a practicing cardiologist and researcher, published innumerable papers, presented lectures on his new research and findings all over the world , provided team leadership to several groups of doctors and researchers from different parts of the country , worked as a member of the inspection team of the Medical Council of India and as an examiner for  MD and DM exainations and served the rich and the poor, privileged and the underprivileged alike with equal care and devotion. Even after joining Apollo as a Senior Consultant , Dr Nigam has been providing expert professional advice and care to one and all including those who serve the nation as national and community leaders on preventive and curative heart_care lifestyle which is detrimentl to the health of the nation..