VICA: Ventilation in Cardiac Arrest
Study Details
Study Description
Brief Summary
Over the last decades, research in cardiopulmonary resuscitation was primarily focused on uninterrupted chest compressions to restore sufficient circulation. Ventilation during ongoing chest compressions was regarded as potentially deleterious and thus not given any major scientific focus. Current guidelines advise that ventilation be monitored by end-tidal CO2 and emphasize that hyperventilation be avoided. Recent findings from arterial blood gas analyses showed high levels of arterial pCO2, resulting in a frequent occurrence of hypercapnic acidosis, which may be caused by iatrogenic hypoventilation. Ventilation during ongoing chest compressions can be hard to achieve, as nearly every breath may be terminated by simultaneous chest compressions. In case of bag ventilation the applied tidal volumes have not yet been measured und mechanical ventilators so far were not able to ventilate during chest compressions, because pressure limit settings induced termination of inspiration.
The aim of this study is to provide patients with the best possible ventilation, even under ongoing cardiac massage. Patients are ventilated with a new turbine-driven ventilator (Monnal T60, Air Liquide, France), which can deliver adequate tidal volumes within a very short inspiratory phase due to the inspiratory flow of > 200l/min. Thus, in deviation from the current recommendations, the ventilation rate can be doubled to 20/min, so that inspiration coincides with cardiac massage less often. The study compares effective ventilation volumes applied by two regimes, 10 breaths/min and 20/min. Success in gas exchange is monitored by arterial blood gas analysis; ventilation parameters are adapted for each patient to requirements accordingly
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
N/A |
Detailed Description
Restoration of circulation is undoubtedly the base of success in cardiopulmonary resuscitation (CPR). Current guidelines on CPR require that hyperventilation be avoided during CPR. Blood gas analysis results from the "BABICA trial" demonstrate that more than 90% of patients have highly elevated levels of pCO2 and are acidotic, mainly due to hypercapnia. No hyperventilated or alkalotic patients were found during CPR. Furthermore, higher pO2 values were found to be associated with improved outcomes. Current recommendations to limit ventilation frequency to 10/min was also critically questioned in a recent study from Belgium, which did not show any positive effect of low respiration rate compared to higher ones, cut-off 10/min. There are currently no clinical trials addressing optimal tidal volumes or minute volumes during CPR.
A major obstacle to continuous measurement of respiratory minute volumes during CPR is ongoing cardiac massage. In a retrospective study in which respiratory volumes were derived from bioimpedance curves, better outcomes were found in the group of more frequent ventilations. Common machine ventilators display set values, while expiratory volumes are averaged and may be overlaid by volume shifts of cardiac massage. In a recent study, investigators analyzed flow curves, where each breath can be evaluated individually and volumes can be derived correctly using dedicated software. We were able to test this method on a comparative study of three ventilators study on anatomical cadavers.
This study aims to detect whether a higher rate of ventilation using a turbine driven ventilator is able to provide higher breathing volumes during ongoing chest compressions in individuals suffering from out-of-hospital cardiac arrest (OHCA). Higher ventilation and oxygenation parameters as well as optimized acid-base-balance and increased rates of ROSC are expected.
Patient care (chest compressions, venous access, endotracheal intubation, application of drugs, defibrillation if necessary) is conducted according to current recommendation for Advanced Life Support (ALS) as issued by the European Resuscitation Council (ERC). Ventilation is performed at one of two patterns: the control group is ventilated at 10 breaths per minute, the intervention group is ventilated at 20 breaths per minute. Patterns are selected randomly by opening a sealed envelope which is fixed on the ventilator. After successful endotracheal intubation mechanical ventilation is carried out using a turbine-driven ventilator (Monnal T60, AirLiquide, France). Ventilator settings are pre-set: respiratory frequency is set at 10/min or 20/min (see above), other ventilator parameters remain identical: Positive End-Expiratory Pressure (PEEP) 5 mmHg, FiO2 1,0, tidal volume 6ml/kg ideal body weight [men: 50+(0.91x(body length-152.4)), women: 45+(0.91y(body length-152.4))]. These calculations can be performed on the ventilator itself by entering patients' age, height and gender. Chest compressions are carried out without interruptions and without considerations regarding the respiratory cycle. After initiation of ventilation arterial cannulization and arterial blood gas analysis - if possible- is performed after 5 and 10 minutes of CPR. If these analyses yield critically abnormal results (pCO2<35mmHg or
75mmHg) changes in ventilation may be made by the prehospital care physician. Study measurements end after disconnecting the ventilator.
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Active Comparator: Alternative Ventilation Rate ventilation is performed at 20 breaths/min |
Procedure: mechanical ventilation
change of ventilation frequency
|
| Active Comparator: Conventional Ventilation Rate ventilation is performed at 10 breaths/min |
Procedure: mechanical ventilation
change of ventilation frequency
|
Outcome Measures
Primary Outcome Measures
- Minute ventilation [during ongoing chest compressions]
exspiratory ventilatory volume per minute
- adequacy of ventilation - pH [during ongoing cardiopulmonary resuscitation]
Evaluation of ventilation success per using arterial blood gas analyses (pH)
- adequacy of ventilation - paCO2 [during ongoing cardiopulmonary resuscitation]
Evaluation of ventilation success per using arterial blood gas analyses (paCO2)
Secondary Outcome Measures
- ROSC [during prehospital resuscitation efforts]
Return of Spontaneous Circulation
Eligibility Criteria
Criteria
Inclusion Criteria:
-
out-of-hospital cardiac arrest (OHCA)
-
cardio-pulmonary resuscitation (CPR) efforts
-
endotracheal intubation
Exclusion Criteria:
-
children and adolescents (age<18 years at inclusion)
-
pregnant women
-
previous documented lack of legal capacity
-
previous documented refusal to participate in trials
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Medical University of Graz | Graz | Styria | Austria | 8036 |
Sponsors and Collaborators
- Medical University of Graz
Investigators
- Principal Investigator: Gerhard Prause, MD, Medical University of Graz
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- VICA