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Predictors of inotrope use during separation from cardiopulmonary bypass
Kenneth H McKinlay1, David B Schinderle, Madhav Swaminathan
1Division of Cardiothoracic Anesthesiology and Critical Care, Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA.
Insights
Six factors predict the need for inotropic support after heart surgery. These include specific echocardiographic findings and surgical details, aiding clinical decisions during cardiopulmonary bypass weaning.
Area of Science:
- Cardiology
- Cardiac Surgery
- Anesthesiology
Background:
- Inotropic support is frequently required after cardiopulmonary bypass (CPB) during cardiac surgery.
- Predicting the need for inotropic support can optimize patient management and outcomes.
Purpose of the Study:
- To identify demographic, clinical, and echocardiographic predictors of inotropic support use at separation from CPB.
- To establish a framework for anticipating and managing hemodynamic instability post-cardiac surgery.
Main Methods:
- Retrospective analysis of 1009 patients undergoing coronary artery bypass graft (CABG) or combined CABG and valve surgery with CPB.
- Intraoperative transesophageal echocardiography (TEE) was used to assess cardiac function.
- Inotropic support defined by specific drug dosages (dopamine, epinephrine, norepinephrine, dobutamine, milrinone) or intra-aortic balloon pump (IABP) insertion.
Main Results:
- 39% of patients required inotropic support upon separation from CPB.
- Six independent predictors identified: Wall Motion Score Index, combined CABG and mitral valve surgery, left ventricular ejection fraction <35%, reoperation, moderate-to-severe mitral regurgitation, and aortic cross-clamp time.
Conclusions:
- Intraoperative TEE findings, combined with clinical and surgical data, can reliably predict the need for inotropic support.
- These predictors offer valuable insights for anesthesiologists and surgeons managing patients after CPB.
Objective:
To identify the demographic, clinical, and echocardiographic features that predict the use of inotropic support at separation from cardiopulmonary bypass (CPB).
Design:
Retrospective study of consecutive patients undergoing coronary artery bypass graft (CABG) surgery.
Setting:
Referral center for cardiothoracic surgery at a university hospital.
Participants:
One thousand nine patients undergoing either CABG or combined CABG and valve surgery with CPB in whom an intraoperative transesophageal echocardiography (TEE) examination was performed.
Interventions:
Inotropic support was defined as the use of dopamine >/=5 microg/kg/min; any dose of epinephrine, norepinephrine, dobutamine, and milrinone; or the insertion of an IABP during separation from CPB. Support was implemented by the anesthesia care team as clinically indicated. Comprehensive TEE examinations were conducted before CPB in all patients according to published guidelines and subsequently reviewed by a single, independent operator.
Measurements And Main Results:
Inotropic support was used in a total of 394 patients (39%) at separation from CPB. The study identified 6 significant, independent predictors of inotrope use: (1) Wall Motion Score Index, (2) combined CABG and mitral valve repair or replacement surgery, (3) left ventricular ejection fraction <35%, (4) reoperation, (5) moderate-to-severe mitral regurgitation, and (6) aortic cross-clamp time.
Conclusions:
Incorporating data from a comprehensive intraoperative TEE examination, the authors identified 6 reproducible factors that independently predict the use of inotropic support at separation from CPB.
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