Division of Cardiology

Nicholas Valettas

MSc (Biomedical Engineering, Toronto); MD (Toronto); FRCP(C), FSCAI

Associate Professor, Division of Cardiology, Department of Medicine






Educational and Professional Standing

  • Bachelor of Applied Science, Mechancial Engineering, University of Toronto
  • Masters of Applied Science, Biomedical Engineering, University of Toronto
  • MD degree, University of Toronto, 1993
  • Cardiology and Interventional Cardiology fellowships, University of Pennsylvania
  • Faculty member, University of Pennsylvania, Interventional Cardiology
  • Director of Cardiac Catheterization Laboratory, Philadelphia VA Medical Centre
  • Faculty Member, McMaster University, Division of Cardiology, 2003
  • Cardiology Clinical Service Chief, Henderson Hospital site
  • Certified, Cardiology, American Board of Internal Medicine
  • Specialist Certificate in Cardiology, Royal College of Physicians and Surgeons of Canada
  • Recipient, Ernest Fallen Cardiology Teaching Award

Clinical Interests

  • Acute Corononary Syndromes
  • Trans-radial Percutaneous Coronary Intervention
  • Cardiac Hemodynamics
  • Pulmonary Hypertension
  • Hypertrophic Cardiomyopathy

Selected Publications

  1. Ravandi A, Sun JC, Lamy A, Valettas N. Fluoroscopy of acutely thrombosed aortic valve. Circulation. 2008 Nov 25; 118(22): e705
  2. Ahmad M, Valettas N. Images in cardiology: giant left atrium. Clin Cardiol. 2006 Apr; 29(4): 179
  3. Valettas N. Does clopidogrel provide additional benefit to aspirin and fibrinolytic therapy in patients after STEMI? Nat Clin Pract Cardiovasc Med. 2005 Oct; 2(10): 500-1. 
  4. Valettas N, Gorman JH, Gorman RC. Pathophisiology and percutaneous coronary sinus repair of mitral regurgitation. In: Herrmann HC(ed.) Interventional Cardiology: Percutaneous Noncoronary Intervention. Humana Press Inc., Totowa, NJ, 2005, pp. 49-68
  5. Valettas N, Herrmann HC. Tirofiban in interventional cardiology: The RESTORE and TARGET trials. In: Lincoff MA(ed.) Platelet Glycoprotein IIb/IIIa Inhibitors in Cardiovascular Disease, 2ed. Humana Press Inc., Totowa, NJ, 2003, pp. 147-166.
  6. Woo YJ, Grand T, Valettas N. Off-pump coronary artery bypass grafting attenuates postoperative bleeding associated with preoperative clopidogrel administration. Heart Surg Forum. 2003; 6(5): 282-5
  7. Valettas N, Herrmann HC. The role of platelets and platelet inhibition in acute myocardial infarction. Coron Artery Dis. 2003 Aug; 14(5): 357-63
  8. Valettas N, Rho R, Beshai J, Lloyd CT, Ross HM, Kocovic D, Herrmann HC. Alcohol septal ablation complicated by complete heart block and permanent pacemaker failure. Catheter Cardiovasc Interv. 2003 Feb; 58(2): 189-93
  9. Herrmann HC, Swierkosz TA, Kapoor S, Tardiff DC, DiBattiste PM, Hirshfeld JW, Klugherz BD, Kolansky DM, Magness K, Valettas N, Wilensky RL Comparison of degree of platelet inhibition by abciximab versus tirofiban in patients with unstable angina pectoris and non-Q-wave myocardial infarction undergoing percutaneous coronary intervention. Am J Cardiol. 2002 Jun 1; 89(11): 1293-7
  10. Swierkosz TA, Valettas N, Herrmann HC. IIb or not IIb: when, how, and which GP IIb/IIIa inhibitor? Catheter Cardiovasc Interv. 2001 Apr; 52(4): 433-4.