Two-page Cardiac Data Registry table shows the number of open heart surgeries at each New Jersey hospital in 2020 and 2021. Scroll to Data Charts. Open heart surgery, diagnostic cardiac catheterization cases, PCI, total volume was almost 85,000 cases at 53 hospitals in 2020. This was down 22% from 2019, likely due to the pandemic. Morristown Memorial Hospital had the largest number of cardiac cases (over 8,000) in the state in 2020. Updated quarterly in 2022 by NJ Dept. of Health.