Photo for Heart Catheterization Registry

Heart Catheterization Registry

Official Title

Heart Catheterization Registry




To quantify the waiting times, morbidity and mortality of patients waiting for catheterization and to identify predictors of cardiac events that occur while patients are waiting. The study reported that patients awaiting cardiac catheterization may experience major adverse events, such as death, myocardial infarction and congestive heart failure, which may be preventable. These findings impacted health care delivery in Canada contributing to increased heart catheterization facilities and improved prioritization schemes that allow earlier access for patients at higher risk.

Study Design

Observational study

Primary Endpoint

Primary Outcome: Cancellation of the procedure, death, MI, congestive heart failure (CHF) and other hospital admission for a primary cardiac diagnosis. Events were not adjudicated.

Number of Patients


Number of Sites


Number of Countries


Study Period


Principal Investigator

Madhu Natarajan

Program Manager

Susan Chrolavicius

Research Coordinator

Cheryl Christmas

Key Publications

  • Natarajan MK, Mehta SR, Holder DH, Goodhart DR, Gafni A, Shilton D, Afzal R, Teo K, Yusuf S. The risks of waiting for cardiac catheterization: a prospective study. CMAJ. 2002;167(11):1233-40.
  • Mercuri M, Mehta S, Xie C, Valettas N, Velianou JL, Natarajan MK. Radial artery access as a predictor of increased radiation exposure during a diagnostic cardiac catheterization procedure. JACC Cardiovasc Interv. 2011 Mar;4(3):347-52.
  • Mercuri M, Natarajan MK, Norman G, Gafni A. An even smaller area variation: differing practice patterns among interventional cardiologists within a single high volume tertiary cardiac centre. Health Policy. 2012 Feb;104(2):179-85.
  • Schwalm JD, Ahmad M, Velianou JL, Pericak D, Natarajan MK. Long-term outcomes with paclitaxel-eluting stents versus bare metal stents in everyday practice: a Canadian experience. Can J Cardiol. 2010 Feb;26(2):e40-4.
  • Mercuri M, Natarajan MK, Holder DH, Xie C, Gafni A. Insight into capacity planning for cardiac catheterization services: policy lessons learned from “Looking in the Mirror” over a decade. Health Policy. 2009 Aug;91(3):314-20.
  • Gupta D, Natarajan MK, Gafni A, Wang L, Shilton D, Holder D, Yusuf S. Capacity planning for cardiac catheterization: a case study. Health Policy. 2007 Jun;82(1):1-11.