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Home > About Us > Clinical Outcomes > Heart Surgery

Heart Surgery


A variety of heart operations are performed by the cardiothoracic surgeons in National University Heart Centre, Singapore (NUHCS).


This site provides an overview of the volume and types of common adult heart operations and clinical outcomes of the patient population who underwent heart surgery at the National University Hospital (NUH) from 2009 until 2016.


Type of heart surgery performed includes but not limited to:

  • Coronary Artery Bypass Graft surgery (CABG) – a surgery to treat coronary artery disease
  • Valve surgery
  • Thoracic aortic surgery
  • Other heart operations (such as those performed to treat the heart rhythm or septal defect – a “hole in the heart”)
  • Combination of any of the above operations


The bar chart below illustrates the proportions of the heart surgeries performed in the NUHCS between the years 2009 and 2016.


Survival Rates after Heart Surgery


Survival after heart surgery is defined as "no death within 30 days of surgery or within the same hospital admission (as the heart surgery)".


Survival rate  = (Number of patients who survive a heart surgery per year / Total number of patients underwent a heart surgery per year) x 100%



The actual survival rates slipped back in 2013 and 2014 due to a surge in high risk operations, which is coherent with the lower predicted survival rates in 2013 and 2014.


For the most common heart surgery, CABG shows a better performing survival rate as seen in the graph below.



In both graphs, the higher observed survival rates in comparison to the expected survival rates over the last 8 years suggests that our surgeons’ performance and clinical outcomes following the heart surgery have been better than expected over the years of 2009 – 2016.




Despite the increasing complexity of heart operations performed and higher risk profile of our patients, our patient’s survival rate has exceeded the expectations over the years. We have also established dedicated programs like the Aortic Surgery, Minimally Invasive Heart Surgery, and Beating Heart Surgery to treat our complex patients with better outcomes. This is in accordance with the NUH’s mission in striving to deliver quality and value to the patients.