Biomedical subjects

Y K Sin

Publications and source records attributed to Y K Sin.

3 recordsLinked to original sources

PubMed2004

Deep hypothermic circulatory arrest in adults undergoing aortic surgery: local experience.

INTRODUCTION: The aim of our study was to evaluate the efficacy and safety of deep hypothermic circulatory arrest (DHCA) as a method of cerebral protection during aortic surgery. MATERIALS AND METHODS: We carried out a retrospective review of 59 consecutive patients (48 men, 11 women) undergoing elective or emergency aortic surgery requiring DHCA from January 1999 to April 2002 in 2 tertiary care hospitals. Data regarding demographics, clinical characteristics, operation type, duration of circulatory arrest, nasopharyngeal temperatures, use of retrograde cerebral perfusion and central nervous system (CNS) morbidity and perioperative mortality were collected and analysed. RESULTS: There were 47 (79.7 %) operations for aortic dissections and 12 (20.3 %) for aortic aneurysms. The mean duration of circulatory arrest was 42 +/- 23 minutes. The lowest nasopharyngeal temperature at the time of arrest was 16.5 degrees +/- 1.9 degrees C. Eight (13.6 %) patients had a new irreversible neurologic deficit postoperatively. These patients had a mean circulatory arrest time of 50 +/- 28 minutes. Temporary neurologic dysfunction occurred in 8 (13.6 %) patients. Intra-hospital mortality was 22 %. The mean circulatory arrest time for patients who died was 54 +/- 24 minutes. CONCLUSION: DHCA is a simple and effective method of CNS protection in aortic surgery with satisfactory outcomes. With increased surgical and anaesthetic experience, as well as selective use of adjuncts of cerebral protection, reductions in mortality and neurological morbidity will likely be achieved in the future.

Aged↗

PubMed2000

The Ultracor tilting disc heart valve prosthesis in the aortic position: mid-term follow up.

BACKGROUND AND AIM OF THE STUDY: The Ultracor valve is a recent introduction in the evolution of the tilting disc valve. This report summarizes a single surgeon's experience with the valve in the aortic position over a nine-year period. METHODS: Between 1990 and 1999, 94 patients received an Ultracor heart valve prosthesis in the aortic position. Forty-five patients (48%) had associated procedures, of which 32 (34%) were coronary artery grafts. Mean follow up was 2.6 years; total follow up was 229 patient-years. Follow up was 100% complete. RESULTS: The actuarial survival rate, including operative mortality rate, at five years was 82%. Actuarial freedom from valve-related death was 96% at five years. The linearized complication rate was 1.7%/year for late valve-related mortality, 1.7%/year for thromboembolism, 2.2%/year for anticoagulant-related hemorrhage (ACH), 1.3%/year for prosthetic valve endocarditis (PVE), and 1.7%/year for reoperation. The estimates of actuarial freedom from complications at five years were thromboembolism 89%, ACH 90%, PVE 96% and reoperation 96%. No structural failure or valve thrombosis was observed. CONCLUSION: Our experience over nine years showed the Ultracor heart valve prosthesis in the aortic position to be comparable with other currently evaluated mechanical heart valves in terms of durability and clinical results. Further study in this area should concentrate on the impact of valve type on left ventricular recovery post-implantation to provide additional information to the surgeon when selecting a valve from the plethora of choices available.

Adult↗

PubMedDate not supplied

Valve-sparing aortic root replacement.

Aortic root replacement with sparing of the aortic valve in selected patients with isolated sinus of Valsalva or sinotubular aneurysm and a normal valve provides the advantages of an anticoagulation-free milieu and a more physiological root hemodynamic. The clinical efficacy and durability have been documented. This report describes a simple and reproducible technique of aortic root remodeling that uses a prosthetic conduit as originally pioneered by Magdi Yacoub and later by Tirone David.

Aortic Aneurysm↗