Dr Duncan Guy is a Cardiologist at the Norwest Private Hospital and takes consultation appointments at the Specialist Services Medical Group in Castle Hill and Westmead. He is the Chairman of the Medical Advisory Committee at the Norwest Private Hospital. Working with the hospital executive on many projects including improving clinical outcomes and compliance with the national health standards, over the past five years. He has also been the Chairman of the Department of Cardiology for three years, introducing the Cardiac Electrophysiology and Ablation and structural heart disease procedures (left atrial appendage closures and atrial septal closures). Additionally, he also oversaw the establishment of a Transcutaneous Aortic Valve Implantation (TAVI) programme at the hospital.

Dr Guy is the Chief Executive Officer of the Specialist Services Medical Group, a company that manages 16 private practices in New South Wales and 3 in Queensland. Since he started running the company in 2006, he has grown it from 24 medical specialists to over 100, expanding their rooms from 4 to 16 in NSW.

Additionally, Dr Guy provides Echnocardiographic surveillance for patients undergoing chemotheraphy with cardiotoxic agents and assists with research in B-RAF inhibitors for Melanoma (the first in-human trial), conducting echocardiographic surveillance of patients being treated with this novel agent. He provides both in-patient and out-patient services to elderly cardiac disease patients in the area of geriatric cardiology, general community cardiology services, and perioperative medicine.

In 2005, Dr Guy completed his PhD Thesis on Microwave, Laser and Radiofrequency Ablation for treatment of Cardiac Arrythmias at the University of Sydney and the Department of Physics at Macquarie University. The thesis aimed to develop techniques for myocardial ablation of atrial arrhythmias, particularly Atrial Fibrillation.

Dr Guy has contributed to many publications and research grants, his most recent being with the Macquarie University and Westmead Hospital in 2003 to 2004 for the Australian Research Council Linkage Grant on “Optical devices for sideways delivery of laser light during keyhole surgery.” He was the author and educational designer of the Interactive ECG online learning resource which is used by NSW Health, Sydney University and other health departments and organisations in Australia. Additionally, he is the Programmer and Co-ordinator of the Medical Officer’s Handbook, an online version of the Westmead Medical Officers Handbook that is distributed via CIAP to all public hospitals in NSW. He has also had experience as a Locum lecturer of Biomedical Engineering (Faculty of Physics) at the University of Sydney as well as other Clinical Tutor roles.

Outside of his medical roles, he is the Foundation Director and Chairman for the Hawkesbury Living Cancer Trust which was founded in the Richmond community for a teenage boy who passed away from cancer. The fund which has raised $1.8 million dollars so far, was originally formed to raise money for his treatment and now continues to provide funding to the community for patients with cancer.

Procedures & Conditions

Procedures Performed
  • General Cardiology
  • Echocardiology
  • Geriatric Cardiology
  • Perioperative Medicine
Conditions Treated
  • Aortic Stenosis
  • Adult Congenital Heart Disease
  • Cardiac Disease


  • Chief Executive Officer
    Specialist Services Medical Group Present
  • Consultant Cardiologist
    Norwest Private Hospital Present
  • Chairman of the Medical Advisory Committee
    Norwest Private Hospital Present
  • Chairman of the Department of Cardiology
    Norwest Private Hospital Present
  • Research Fellow
    Department of Cardiology, Westmead 2001 - 2003
  • National Heart Foundation of Australia Postgraduate Medical Scholar
    Department of Cardiology, Westmead Hospital 1999 - 2001

Memberships & Awards

  • Frank Fay Prize for Surgery

  • Huntington's Association Prize

Research & Publications


1. Dewit D, Guy D, Foster K. Recurrent Legionella longbeachae pneumonia associated with re-exposure to potting soil? Aust NZ J Med 1996; 26 p856-857

2. Chiu HM, Mohan AS, Guy D, Ross DL. Coaxial slot array antenna for microwave catheter ablation. In 7th International Symposium on Recent Advances in Microwave Technology Proceedings, Camacho Penalosa C and Rawat BS (Eds), Centro de Ediciones de la Diputacion Provincial de Malaga, Malaga, Spain, 1999 pages 203-206

3. Eipper V, Guy DJ, Tanswell G, Ross DL. Should a negative electrophysiology study influence the decision to implant a defibrillator in patients presenting with a clinical ventricular arrhythmia? (abstract) Presented at Cardiac Society of Australia and New Zealand conference, Wellington New Zealand. 1999

4. Chiu HM, Guy DJR, Mohan AS, Thomas SP and Ross DL, “A Novel Array Antenna Based Catheter for Microwave Cardiac Ablation”, Proceedings of the ISAP2000, vol 4, pp 384-388, August 2000.

5. Chiu HM, Guy DJR, Mohan AS, Thomas SP and Ross DL, “Miniaturized Antennas for Microwave Ablation for the Cure of Cardiac Arrhythmias”, Proceedings of the APMC2000, pp. 50-53, December 2000.

6. Guy DJR, Chui HM, Mohan AS, Thomas SP, Ross DL. Microwave cardiac ablation: A comparison of lesions created with a novel coaxial slot array to lesions with a helical coil antenna. (Abstract) Presented at Cardiac Society of Australia and New Zealand conference, Melbourne. 2000

7. Guy DJR, Chui HM, Mohan AS, Thomas SP, Ross DL. Lesions suitable for atrial and ventricular ablation can be produced with a single novel microwave antenna. (Abstract) Presented at Cardiac Society of Australia and New Zealand conference, Melbourne. 2000

8. Chiu HM, Guy DJR, Mohan AS, Thomas SP and Ross DL, “Control of Lesion Sizes Generated by Coaxial Slot Array Antenna For Myocardial Tissue Ablation: A Comparative Study of Microwave Energy Delivery Method”, Proceedings of the ISMOT’01, pp. 523-526, June 2001.

9. Guy DJ, Thomas SP, Boyd AC, Nicholson I, Nunn G, Chard RB, Ross DL. Posterior left atrial floor-coronary sinus are critical sites for left atrial flutter after attempts at curative surgery for atrial fibrillation using radiofrequency energy. (Abstract) Presented at Cardiac Society of Australia and New Zealand conference, Auckland New Zealand 2001

10. Thomas SP, Guy DJR, Rees A, Collins L, Ross DL. Production of narrow but deep Duncan J R Guy lesions suitable for ablation of atrial fibrillation using a saline-cooled narrow beam Nd:YAG laser catheter. Lasers in Surgery and Medicine 2001;38:375-380

11. Thomas SP, Guy DJR, Boyd AC, Eipper VE, Ross DL, Chard RB. Comparison of epicardial and endocardial linear ablation using handheld probes. Ann Thorac. Surg 75:543-8

12. Guy DJR, Thomas SP, Boyd AC, Ross DL. Increasing power versus duration for radiofrequency ablation with high superfusate flow: Implications for pulmonary vein ablation? Pacing and Clinical Electrophysiology. 26(6):1379-85, 2003 Jun

13. Chui HM, Guy DJR, Wiley A, Ross DL, Mohan A. Analysis of a Novel Expanded Tip Wire (ETW) Antenna for Microwave Ablation of Cardiac Arrhythmias. IEEE Transactions on Biomedical Engineering. 2003 Jul;50(7):890-9

14. Thomas SP. Guy DJ. Boyd AC. Eipper VE. Ross DL. Chard RB. Comparison of epicardial and endocardial linear ablation using handheld probes. Annals of Thoracic Surgery. 75(2):543-8, 2003 Feb.

15. Thomas SP, Guy D, Wallace E, Crampton R, Kijvanit P, Eipper V, Ross DL, Cooper MJ. Rapid loading of Sotalol or amiodarone for management of recent onset symptomatic atrial fibrillation: a randomized, digoxin controlled trial. Am Heart J. 2004 Jan;147(1)

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