Intraoperative Global Longitudinal Strain and Global Longitudinal Strain Rate as Predictors of Unfavorable Outcome in On-Pump Mitral Surgery

Study Overview
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Brief Summary
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The aim of the present study is to assess the best echocardiographic parameters (GLS, GLS rate and standard echocardiographic parameters) predicting LCOS in on-pump mitral surgery.

Detailed Description
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Low cardiac output syndrome (LCOS) is a common complication in cardiac surgery after weaning from cardiopulmonary bypass (CPB) associated with high morbidity and mortality. Its prompt recognition and management may mitigate the effect of LCOS on the outcome. To date, advanced age, prolonged CPB, urgent surgery and impaired left ventricular function assessed by left ventricular ejection fraction (LVEF) are commonly considered strong predictors of postoperative LCOS. Nevertheless, LVEF has several limitations including image quality, operator experience, limited reproducibility, inter- and intra-observer discrepancy and load/volume dependency. Global Longitudinal Strain (GLS), with automated speckle-tracking echocardiography (STE) may overcome several of the LVEF limitations. In fact, while the LVEF detects changes in left ventricular chamber volume, GLS reflects myocardial longitudinal deformation due to contraction. The rate of myocardial deformation over time (expressed as 1/s) is called GLS Rate. Global Longitudinal Strain, mostly evaluated from transthoracic echocardiography (TTE), has shown lower inter- and intra-observer variability, a better reproducibility and prognostic value compared to LVEF in a generic cardiac population. In addition the results of the GLS with TTE (GLS-TTE) may not be shifted in cardiac surgery due to the effect of the general anesthesia (GA) and positive pressure ventilation. Thus, these factors should be considered when the global longitudinal strain, evaluated from transesophageal echocardiography (GLS-TEE) is used as predictor of early outcome. Amabili et al. have shown that GLS-TEE is better than LVEF in predicting LCOS in a general cardiac surgery population. Similarly Sonny et al. in patients undergoing aortic valve surgery for stenosis have reported that a GLS-TEE and GLS-TEE Rate are superior to standard echocardiographic parameters in predicting a complicated course. To the best of our knowledge, there are no studies investigating the role of intraoperative evaluation of GLS-TEE and GLS-TEE Rate as predictors of LCOS in mitral valve surgery. In this setting LVEF is not a reliable marker of cardiac function due to a systematic overestimation of the ejection fraction. Moreover these patients are at high risk of postoperative cardiac dysfunction and LCOS owing to the afterload mismatch after mitral surgery. For the reasons mentioned above, more effective predictors are advocated. In the present study we try to fill the gap. Thus, aim of present study is to assess the role of GLS-TEE, GLS-TEE Rate and standard echocardiographic parameters in predicting LCOS in on-pump mitral surgery. In doing so, the best cut-off for each echocardiographic parameter will be provided. Finally to detect the effect of the GA, the echocardiographic parameters calculated after the induction of GA will be compared with those collected preoperatively. A telephonic follow-up will be performed at 30 days and 12-months investigating mortality and rehospitalization due to heart failure.

Official Title
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Intraoperative Transesophageal Echocardiography in On-pump Mitral Surgery: A Single Center Prospective Observational Study of Global Longitudinal Strain and Global Longitudinal Strain Rate as Predictors of Unfavorable Outcome

Conditions
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Mitral Valve Disease, Low Cardiac Output Syndrome

Intervention / Treatment
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* Device: Philips QLAB Ultrasound Quantification Software


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All patients undergoing elective or urgent open mitral valve repair or mitral valve replacement over 18 years Ability to sign informed consent Availability of pre-CBP and after-CPB intraoperative transesophageal echocardiography which include a 4-chambers, 2-chambers and a long axis view at a minimum frame rate of 50 Hz Good quality echocardiographic images with a optimal endocardial definition Good quality ECG tracing Exclusion Criteria: All patients undergoing emergent open mitral valve repair or mitral valve replacement Unavailability of pre-CBP and after-CPB intraoperative transesophageal echocardiography which include a 4-chambers, 2-chambers and a long axis view at a minimum frame rate of 50 Hz Poor quality echocardiographic images ECG artefacts

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Device: Philips QLAB Ultrasound Quantification Software|Offline processing of intraoperative transesophageal echocardiography would be performed with Global Longitudinal Strain on apical 4 chamber, apical 2 chamber and long axis views in order to analyze left ventricle and left atrium contractility and right ventricle free wall motion|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Global longitudinal strain of myocardium in mitral valve surgery | Offline processing of GLS, GLS Rate | Intraoperative 6 hours | 
| Number of patients with low cardiac output syndrome after mitral valve surgery |  | 30 days | 
| Global longitudinal strain threshold associated with LCOS after mitral valve surgery |  | Intraoperative 6 hours | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Effect of general anesthesia on systole and diastole |  | Intraoperative 6 hours | 
| All-cause mortality during the follow-up |  | 30 days and 1years | 
| Length of intensive care unit stay |  | 30 days | 
| Length of hospital stay |  | 30 days | 
| 30-day or in hospital mortality |  | 30 days | 
| Duration of post-operative mechanical ventilation |  | 30 days | 
| Post-operative rate of acute kidney injury |  | 30 days | 
| Post-operative rate of hepatic dysfunction |  | 30 days | 
| Readmission rate in intensive care |  | 30 days |