Right Ventricular Pressure Waveform Monitoring in Cardiac Surgery

Study Overview
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Brief Summary
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RV dysfunction has been associated with increased mortality in the ICU and cardiac surgical patients. Thus, early identification of RV dysfunction at less severe stages will allow for earlier intervention and potentially better patient outcomes. However, so far, no studies have reported prospectively the prevalence of abnormal RV pressure waveform during cardiac surgery and in the ICU. The investigator's primary hypothesis is that the prevalence of abnormal RV pressure waveform occurs in more than 50% of cardiac surgical patients throughout their hospitalization. Those patients with abnormal RV pressure waveform will be more prone to post-operative complications related to RV dysfunction and failure in the OR and ICU.

Detailed Description
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Right ventricular (RV) dysfunction is mostly associated to a decrease in contractility, right ventricular pressure overload or right ventricular volume overload. RV dysfunction can occur in a number of clinical scenarios in the intensive care unit (ICU) and operating room (OR): pulmonary embolism, acute respiratory distress syndrome (ARDS), septic shock, RV infarction, and in pulmonary hypertensive patients undergoing cardiac surgery. Unfortunately, identifying which patients will develop RV dysfunction and then progress towards RV failure have proven difficult. One of the reasons for delaying the diagnosis of RV dysfunction could be the lack of uniform definition, especially in the perioperative period. Echocardiographic definitions of RV dysfunction have been described: RV fractional area change (RVFAC) < 35 %, tricuspid annular plane systolic excursion (TAPSE) < 16 mm, tissue Doppler S wave velocity <10 cm/s, RV ejection fraction (RVEF) <45% and RV dilation. However, echocardiographic indices alone are insufficient in describing RV function. The diagnosis of fulminant RV failure is more easily recognised as a combination of echocardiographic measures, compromised hemodynamic measures and clinical presentation. RV dysfunction is inevitably associated with absolute or relative pulmonary hypertension because of the anatomic and physiological connection between the RV and pulmonary vascular system. The gold standard for measuring pulmonary pressure is still the pulmonary artery catheter. However, RV output can initially be preserved despite of pulmonary hypertension. It is therefore mandatory that early, objective, continuous, easily obtainable and subclinical indices of RV dysfunction are found and validated to initiate early treatment of this disease.

Official Title
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Early Identification and Prediction of Right Ventricular Dysfunction and Failure in Critically Ill Patients: An Observational Non-Interventional Cohort Study

Conditions
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Right Ventricular Dysfunction, Right Heart Failure, Congestive Heart Failure

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: -Male or female patients, age 18 and older, undergoing cardiac surgery and receiving standard of care monitoring utilizing a pulmonary artery catheter. Exclusion Criteria: Emergency surgery or inability to obtain consent Concomitant diseases such as pericardial constriction, congenital heart disease, severe valvular regurgitation, right ventricular systolic dysfunction, or right ventricular infarction.

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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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Proportion of abnormal diastolic RV waveforms before CPB, after CPB and in the ICU | Abnormal RV pressure waveform will be defined as a difference between the RV end-diastolic minus the early-diastolic pressure > 4 mmHg. | From thermodilution catheter insertion until 2 hours after ICU arrival | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Proportion of patients with difficult and complex separation from cardiopulmonary bypass at the end of cardiac surgery | Difficult separation from cardiopulmonary bypass: instability requiring at least two different types of pharmacological agents (i.e., inotropes ± vasopressors ± inhaled agents) Complex separation from cardiopulmonary bypass: Hemodynamic instability requiring return on cardiopulmonary bypass or addition of mechanical support (intra-aortic balloon pump or extra-corporeal membrane oxygenator) | From the discontinuation of cardiopulmonary bypass until ICU arrival after surgery, assessed up to 4 hours. | 
| Cumulative time of Persistent Organ Dysfunction or Death (TPOD) during the first 28 days after cardiac surgery | TPOD is a continuous variable representative of the burden of care and morbidity during the first 28 days following cardiac surgery and was chosen to circumvent issues arising for using other clinical endpoint such as ICU length of stay | Up to 28 days or until hospital discharge | 
| Incidence of deaths during hospitalisation | Death from any cause | Up to 30 days or until hospital discharge | 
| Incidence of acute kidney injury (AKI) | Acute kidney injury (AKI) according to KDIGO serum creatinine criteria: Stage 1: ≥50% or 27 umol/L increases in serum creatinine, Stage 2: ≥100% increase in serum creatinine, Stage 3 ≥200% increase in serum creatinine or an increase to a level of ≥254 umol/L or dialysis initiation. | Up to 28 days or until hospital discharge | 
| Incidence of major bleeding | Major bleeding is defined by the Bleeding Academic Research Consortium (BARC) as one of the following: Perioperative intracranial bleeding within 48h Reoperation after closure of sternotomy for the purpose of controlling bleeding Transfusion of ≥5 units of whole blood of packed red blood cells within a 48 hours period Chest tube output ≥2L within a 24 hours period | Up to 28 days or until hospital discharge | 
| Incidence of surgical reintervention for any reasons | Re-operation after the initial surgery for any cause | Up to 28 days or until hospital discharge | 
| Incidence of deep sternal wound infection or mediastinitis | Diagnosis of a deep incisional surgical site infection or mediastinitis by a surgeon or attending physician | Up to 28 days or until hospital discharge | 
| Incidence of delirium | Delirium is defined as an intensive care delirium screening checklist (ICDSC) score(18) of ≥4 in the week following surgery or positive result for the Confusion Assessment Method for the ICU (CAM-ICU). | Up to 28 days or until hospital discharge | 
| Incidence of stroke | Central neurologic deficit persisting longer than 72 hours | Up to 28 days or until hospital discharge | 
| Total duration of ICU stay in hours | Number of hours passed in the ICU | Up to 28 days or until hospital discharge | 
| Duration of vasopressor requirements (in hours) | Vasopressors include norepinephrine, epinephrine, dobutamine, vasopressin, phenylephrine, milrinone, isoproterenol and dopamine. | Up to 28 days or until hospital discharge | 
| Duration of hospital stay (in days) | Number of days hospitalized from the day of surgery to discharge | Up to 28 days or until hospital discharge | 
| Duration of mechanical ventilation (in hours) | A duration of >24 hours will be considered prolonged ventilation requirements. | Up to 28 days or until hospital discharge | 
| Incidence of major morbidity or mortality | Including death, prolonged ventilation, stroke, renal failure (Stage ≥2), deep sternal wound infection and reoperation for any reason. | Up to 28 days or until hospital discharge | 
| Right ventricular ejection fraction | Assessed by the American Society of Echocardiography guidelines | From arrival to the operating room until 2 hours after ICU arrival | 
| Right ventricular fractional area change | Assessed by the American Society of Echocardiography guidelines | From arrival to the operating room until 2 hours after ICU arrival | 
| Right ventricular strain | Assessed by the American Society of Echocardiography guidelines | From arrival to the operating room until 2 hours after ICU arrival | 
| Tricuspid annular plane systolic excursion | Assessed by the American Society of Echocardiography guidelines | From arrival to the operating room until 2 hours after ICU arrival | 
| Right ventricular performance index | Assessed by the American Society of Echocardiography guidelines | From arrival to the operating room until 2 hours after ICU arrival | 
| Portal flow pulsatility fraction | Defined as the difference between the maximal and the minimal velocity during the cardiac cycle divided by the maximal velocity | From arrival to the operating room until 2 hours after ICU arrival | 
| Right ventricular stroke work index | 0.0136x Stroke volume index x (Mean pulmonary artery pressure-mean right atrial pressure) | From arrival to the operating room until 2 hours after ICU arrival | 
| Relative pulmonary pressure | The ratio of the mean systemic arterial pressure divided by the mean pulmonary artery pressure | From arrival to the operating room until 2 hours after ICU arrival | 
| Right ventricular function index | Defined as (isovolumic contraction time + isovolumic relaxation time)/RV ejection time | From arrival to the operating room until 2 hours after ICU arrival | 
| Pulmonary artery pulsatility index (PAPi) | Defined as (systolic pulmonary artery pressure - diastolic pulmonary artery pressure)/central venous pressure] | From arrival to the operating room until 2 hours after ICU arrival | 
| Compliance of the pulmonary artery (CPA) | Stroke volume divided by the pulmonary artery pulse pressure (systolic minus the diastolic pulmonary artery pressure) | From arrival to the operating room until 2 hours after ICU arrival | 
| Pulsatility of femoral venous flow | Velocity variations of blood flow in the femoral vein during the cardiac cycle | From arrival to the operating room until 2 hours after ICU arrival | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Right Ventricular Pressure Waveform