alexa Pre-emptive Maximization Of Oxygen Delivery In The Cardiac Surgical Patients Including The Low Ejection Fraction Patients | 9937
ISSN: 2161-1076

Surgery: Current Research
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2nd International Conference on Surgery and Anesthesia

Kanishka Indraratna
ScientificTracks Abstracts: Surgery Curr Res
DOI: 10.4172/2161-1076.S1.012
The tissue oxygen requirements of patients undergoing coronary artery bypass or cardio-pulmonary bypass are huge. The delivery of oxygen depends mainly on the stroke volume. The stroke volume depends on volume status, contractility and the afterload. These factors can be adversely affected intra operatively. The imbalance between oxygen delivery and requirement causes a poor outcome. This paper addresses this issue by pre-emptively maximizing oxygen delivery. In a patient with an ejection fraction of less than 30% having serious impairment of oxygen delivery, surgery will be started with Milrinone immediately prior to induction of anesthesia, to improve contractility and minimize further deterioration. Fluid boluses to optimize volume should only be given if there is volume deficiency and the patient can increase the cardiac output in response to fluid. Superior vena cava collapsibility and stroke volume variation were assessed with transoesophageal echocardiography. Fluid boluses were given accordingly. The afterload was optimized after measuring afterload reserve. The adequacy of tissue oxygenation was measured with superior vena cava oxygen saturation both before and after weaning off bypass. 85 successive patients have been done with this technique. 26% were with ejection fractions less than 30%. Overall mortality was 1.2%, the single mortality being in the low ejection fraction group (4.5%). The use of the intra aortic balloon pump was 0%. These results compare very favorably with other published studies.
Kanishka Indraratna is Consultant Anaesthesiologist at Sri Jayewardenepura General Hospital, Sri Lanka. He has also worked as a Consultant Anaesthesiologist in England. His interests are cardiac and neuro anesthesia, critical care and intra operative transoesophageal echocardiography. A review article by him on ?To give or not to give fluid challenges? was published in Trends in Anesthesia and Critical Care , June 2012.
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