There is a good career scope after B.Sc. Cardiology and Salary packages are also not bad. After completing graduation you may find job in Academic Institutes, Pvt./Govt. Hospitals and Clinics, Healthcare Offices, NGOs, Nursing Care Homes, Rehabilitation Centres and many more.
You may have one of these following job profiles-
The average salary package is around Rs. 40-50k per month(AS per some of the online data available online) In case of Government job, salary will be based on pay scale and grade.
I hope my answer helps. All the very best for your future endeavors!
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