Fast-Track Recovery in Noncoronary Cardiac Surgery Patients

Enhanced Recovery After Cardiac Surgery: Where Do We Stand?

Purpose of Review

Enhanced recovery after surgery (ERAS) protocols are multimodal and multi-professional strategies to enhance postoperative convalescence and thereby reduce the length of hospital stay and hospital-associated complications. This review provides an up-to-date overview about basic principles of enhanced recovery after surgery protocols, their transfer into cardiac surgery, and their current state of evidence. It is supposed to offer clinical implications for further adaptations and implementations of such protocols in cardiac surgery.

Recent Findings

ERAS protocols are a story of success in numerous surgical disciplines and led to a paradigm shift in perioperative care and the establishment of ERAS Cardiac Society, a non-profit organization that provides evidence-based guidelines and recommendations for further development of enhanced recovery protocols, trying to harmonize the many existing efforts of individual approaches for cardiac surgery.

Summary

Promising results from comprehensive ERAS protocols in cardiac surgery emerged. Nevertheless, there is a paucity of high-quality data about holistic approaches in cardiac surgery and further efforts need to be promoted.

Contemporary Outcomes of Surgical Aortic Valve Replacement in Japan

BACKGROUND

Given the rapid expansion in the use of transcatheter aortic valve implantation (TAVI), recent outcomes of surgical aortic valve replacement (SAVR) should be re-evaluated.

METHODS AND RESULTS

Using the data from the Japan Cardiovascular Surgery Database of 160 enrolled hospitals, trends in elective isolated SAVR were evaluated until the introduction of TAVI in Japan. Trend analyses were performed over 4 periods: period 1, 2008-2009 (4,415 cases); period 2, 2010-2011 (4,861 cases); period 3, 2012-2013 (5,674 cases); and period 4, 2014-2015 (5,563 cases). Baseline risk, evaluated on JapanSCORE, increased significantly over the 4 periods, from a median of 1.56 (IQR, 0.99-2.61) in period 1 to 2.08 (IQR, 1.33-3.96) in period 4 (P<0.001, trend test). Despite the increased risk, the composite major complication and operative mortality rate decreased significantly (10.7% in period 1 to 9.2% in period 4, P=0.01). Using a risk-adjusted model, the OR of operative mortality was 1.61 (95% CI: 1.29-2.02) in period 1 (P<0.0001) compared with period 4. An increase in the use of bioprostheses was also observed, from 60.4% to 76.8% (P<0.001) over the 4 periods.

CONCLUSIONS

Even in a short 8-year period, SAVR outcomes improved in Japan. This should be taken into account when discussing the indications for aortic valve intervention.

Establishing the Content Validity of an Early Extubation Protocol: A Quality Improvement Project for Improving Early Extubation of Coronary Artery Bypass Graft Patients

Introduction: Patients undergoing coronary artery bypass graft surgery will require intubation and the use of mechanical ventilation during and after surgery. It is well accepted that early extubation is associated with not only positive patient outcomes but also organizational outcomes as well. Patients who are not extubated early are at risk for complications associated with prolonged intubation. The literature supports the use of protocol aid with early extubation. The goal and expected outcome of this project is to establish the usability of an early extubation protocol by assessing its appropriateness for use in the postoperative cardiac surgical adult patient. Methods: For the purpose of establishing content validity of an early extubation protocol, 2 protocols were chosen from the literature. Fifteen cardiac surgery experts were invited to select the protocol they felt was most appropriate for use in this patient population. These reviewers were then asked to further analyze the protocol based on a 5-question survey. Their response was used to calculate a scale-content validity index (S-CVI) and an item-content validity index (I-CVI). Results: Twelve of 15 experts participated in the project. The content validity was estimated using (a) interrater agreement for relevance for each item (I-CVI) and (b) S-CVI. The means were established for each item. Content validity was estimated using (a) interrater agreement for relevance for each item (I-CVI: 0.75-1.00); and the S-CVI/average = 0.92. Cronbach's alpha was estimated to establish reliability (0.972). Conclusion: Selecting an appropriate protocol to be used in this patient population is the first step in implementing an effective early extubation process. The results highly suggest that the content of this protocol is quite relevant in this patient population. It is hoped that this will set the stage for early extubation in postoperative cardiac surgery patients.

Mild Hypercapnia After Uncomplicated Heart Surgery Is Not Associated With Hemodynamic Compromise

OBJECTIVE

The aim of this study was to examine the effects of small changes in PaCO(2) on hemodynamic parameters after uncomplicated heart surgery with cardiopulmonary bypass.

DESIGN

This was a prospective, randomized crossover study.

SETTING

A large academic medical center.

PARTICIPANTS

Twenty-four subjects who were scheduled for elective cardiac surgery were enrolled in this study.

INTERVENTIONS

Each subject underwent the normal procedures that are associated with cardiac surgery. General anesthesia, including muscle relaxation, were continued in the immediate postoperative period. Measured tidal volumes and minute ventilation were kept constant for the duration of the study. Target PaCO(2) concentrations of 30, 40, and 50 mmHg were achieved by adding varying amounts of exogenous CO(2) gas to the inhaled oxygen. Various measurements were made at each target PaCO(2), including cardiac index, mixed venous oxygen saturation, blood pressure, heart rate, and pulmonary artery pressure.

MEASUREMENTS AND MAIN RESULTS

Twenty-four patients were enrolled. Seven were withdrawn before commencement of the study. The cardiac index increased when the PaCO(2) was increased from 30 to 40 mmHg (p < 0.001) and remained unchanged between 40 and 50 mmHg. Mixed venous oxygen saturation increased (p < 0.001) with elevations in PaCO(2) up to 50 mmHg and decreased again when the PaCO(2) was returned to 30 mmHg. The blood pressure decreased (p < 0.001) with increasing PaCO(2). The pulmonary pressure increased (p < 0.001) with elevations in PaCO(2). No patient became hemodynamically unstable or had any arrhythmias.

CONCLUSION

The findings of this study suggest that unless there is a specific contraindication to mild hypercapnia, such as pulmonary hypertension or hemodynamic instability, concerns about mild respiratory acidosis should not prevent weaning of sedation and mechanical ventilation after uncomplicated heart surgery.

Fast-track failure after cardiac surgery: Development of a prediction model*

OBJECTIVE

Risk factors for unsuccessful fast-tracking of cardiac surgery patients have not been collectively defined in the literature. The aim of this study was to determine risk factors for fast-track failure and incorporate them into a predictive fast-track failure score.

DESIGN

Prospective observational study.

SETTING

Cardiothoracic Department of St Mary's Hospital, London.

PATIENTS

Data were collected from April 2003 to April 2005 including 1,084 patients undergoing heart surgery who were admitted into the fast-track unit.

INTERVENTIONS

Multifactorial logistic regression was used to develop a propensity score for estimating the likelihood of fast-track failure.

MEASUREMENTS AND MAIN RESULTS

One hundred and sixty-nine patients failed fast-track management (15.6%). Independent predictors for fast-track failure were impaired left ventricular function with or without recent acute coronary syndrome (odds ratios 2.89 and 1.65 respectively), re-do operation (one, two, or more vs. none, odds ratio 1.75, 7.98), extracardiac arteriopathy (odds ratio 2.63), preoperative intra-aortic balloon pump (odds ratio 3.09), raised serum creatinine in micromol/L (120-150, >150 vs. <120, odds ratio 1.57, 11.24), and nonelective (odds ratio 3.43) and complex surgery (odds ratio 2.70). Model validation showed very good discrimination (area under the curve = 0.815) and calibration (ĉ statistic = 8.527, p = .129).

CONCLUSIONS

The fast-track failure score incorporates several preoperative factors and has been successfully internally validated; after undergoing external validation and possible recalibration it may be used as a tool to facilitate planning and flow of cardiac surgery patients, based on the predicted probability of failure. Application of this score may limit fast-track failure rates and help to reduce morbidity and cost.