Ventricular Stimulation as Predictor of Hypovolemia After Cardiac Surgery (TESTI)

Test of Ventricular Stimulation as Immediate Predictor of Hypovolemia After Cardiac Surgery: Non-randomized Open Label Trial.

The purpose of the study is to validate a ventricular pacing test as a predictor of preload dependency in post cardiac surgery patients.

Study Overview

• Status: Completed
• Conditions: Cardiac Surgery; Hypovolemia
• Intervention / Treatment: Diagnostic test: Detection of hypovolemia using a ventricular stimulation without atrial pacing

Detailed Description

In the immediate postoperative period of cardiac surgery and in intensive care unit (ICU), a systemic arterial hypotension is frequently observed. This hypotension is often due to hypovolemia but also to pump dysfunction and/or vasoplegia. Early recognition of the hypotensive mechanism is necessary because it requires immediate specific treatment.

The interest of a vascular filling is usually estimated by a preload dependence test (fluid responsiveness), showing an increase in the stroke volume when preload is increased according to the Starling the law of the heart. To date, a preload dependency test is usually performed by passive leg raise (PLR) or by measuring the respiratory pulse variation (ΔPP).

The PLR response varies according to the legs venous volume and capacitance. The derivation of ΔPP has been validated in patients intubated, sedated, and ventilated in standard conditions, in sinus rhythm but the ΔPP directly displayed by the monitors is unreliable and the manual calculation on pressure curve is fastidious. Faced with these difficulties, the trend is to realize a blind filling with physiologic saline solution and to judge his interest on clinical and / or hemodynamic criteria.

After cardiac surgery, ventricular epicardial electrodes are systematically placed allowing a temporary stimulation by an external pacemaker in case of postoperative atrio-ventricular blocks. The ventricular stimulation without atrial pacing (VESAP) leads to a loss of the atrial systole and therefore a decrease in the left ventricular preload. During the functional test of epicardial electrodes at a frequency greater than the patient's, it is possible to observe in certain circumstances a decrease of the arterial blood pressure, but of varying importance.

The investigators suspect that the eventual fall in blood pressure during a ventricular pacing test, could be correlated with preload dependence. Therefore, investigator hypothesize that ventricular pacing can be used to realize a functional testing of preload dependence, easy to achieve. Indeed, if doctors admit that during a brief ventricular stimulation, heart rate and systemic vascular resistance remain unchanged, the drop in blood pressure should reflect the decrease in stroke volume.

The main objective of this study is to demonstrate that the response to VESAP can predict the preload dependence of patients after a cardiac surgery. The primary endpoint will study the predictive value of the change in blood pressure during the VESAP and the change in stroke volume after an infusion of 500 cc of crystalloid solution. Secondary endpoints will 1) compare the predictive values of the VESAP and ΔPP; 2) look for pertinent VESAP threshold in correlation with the expected increase in stroke volume; and 3) collection of the possible complications due to the VESAP.

30 patients will be enrolled in this monocentric, open label, non-randomized study.

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Contacts and Locations

Study Locations

• France
  • Neuilly Sur Seine Ile De France
    • Neuilly-sur-Seine, Neuilly Sur Seine Ile De France, France, 92200
      • CMC Ambroise Paré

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Over 18 years old,

• Programmed for cardiac surgery with the need for invasive hemodynamic monitoring (pulmonary artery catheter) according to the recommendations:

  • Euroscore with predicted mortality> 10%
  • Left ventricular ejection fraction (LVEF) <40%
  • Left ventricular ejection fraction (LVEF) <50% for mitral insufficiency
  • pulmonary artery hypertension (PAH)> 50 mmHg
  • Tricuspid insufficiency> 3.4 m / s
  • Tricuspid annular plane systolic excursion (TAPSE) <16 mm
  • Dilatation of the inferior vena cava under respiratory collapse
• Sinus rhythm in immediate postoperative period,
• Sedated with mechanical ventilation,
• Having given their written participation consent in accordance with the regulations,
• Benefiting from a social security

Exclusion Criteria:

• Pregnant or lactating women,
• Patient under guardianship, Under curatorship or court of justice,
• Discomfort to communication or neuropsychic disorders,Inability to understand, to read or to write the French language,
• Patients for whom a fluids overload seems obvious to the intensivist and for whom a crystalloids filling would be contraindicated,
• Patients for whom respiratory changes in pulse pressure (ΔPP) measurement is not validated: patients with spontaneous ventilation, atrial fibrillation, non-sedated

Study Plan

How is the study designed?

Design Details

• Primary Purpose: DIAGNOSTIC
• Allocation: NA
• Interventional Model: SINGLE_GROUP
• Masking: NONE

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

EXPERIMENTAL: VESAP; patient receiving stimulation test to detect hypovolemia

Diagnostic test: Detection of hypovolemia using a ventricular stimulation without atrial pacing; Upon the return in intensive care: Baseline measurements: 1) Three measurements of blood pressure during inspiration and 3 during expiration will be collected for averaging systolic blood pressure, diastolic blood pressure, mean arterial pressure and ΔPP. Data from a pulmonary artery catheter will be also collected.; Realization of VESAP pacing with adjustment of the pacemaker (PM) at a heart rate 5 bpm higher than the heart rate of the patient. After 20 seconds of stimulation, recording of the blood pressure curve as done at baseline during at least 3 respiratory cycles,; Then vascular filling with 500 ml of physiologic saline solution over 10 minutes and new set of measurement (same than at baseline); Second realization of VESAP pacing, and new set of measurement (same than at Baseline); Then, if the ΔPP is >10%, new vascular filling with 500 ml of physiologic saline solution over 10 min and new set of measurements as previously performed.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Evaluate the correlation between thes stimulation test and the cardiac output	Measure the cardiac flow before and after the VESAP, and after an infusion of 500 cc of crystalloid solution.	1 hour

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Collection of the possible complications due to the VESAP	Number of participants with low blood presseur or with heart rhythm disorder.	2 hours and 24 hours
Evaluate the correlation between the VESAP and the ΔP	Measure the of the blood presser before and after stimulation test and after an infusion of 500 cc of crystalloid solution	1 hour
Look for pertinent VESAP threshold in correlation with the expected increase in stroke volume	Measure the of the strocke volume before and after stimulation test and after an infusion of 500 cc of crystalloid solution	1 hour

Collaborators and Investigators

• Sponsor: CMC Ambroise Paré
• Investigators: Principal Investigator: Philippe ESTAGNASIÉ, MD, CMC Ambroise Paré

Study record dates

Study Major Dates

• Study Start (ACTUAL): July 22, 2019
• Primary Completion (ACTUAL): October 13, 2020
• Study Completion (ACTUAL): October 14, 2020

Study Registration Dates

• First Submitted: April 17, 2019
• First Submitted That Met QC Criteria: April 23, 2019
• First Posted (ACTUAL): April 25, 2019

Study Record Updates

• Last Update Posted (ACTUAL): November 29, 2021
• Last Update Submitted That Met QC Criteria: November 26, 2021
• Last Verified: November 1, 2021

More Information

Terms related to this study

• Keywords: cardiac surgery; Fluid responsiveness; hypotension; PLR; Preload-dependency; delta PP
• Additional Relevant MeSH Terms: Pathologic Processes; Hypovolemia
• Other Study ID Numbers: 2018/13

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No