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Potassium Chloride in Out-of-hospital Cardiac Arrest Due to Refractory Ventricular Fibrillation

Phase 2
Withdrawn
Conditions
Out-of-hospital Cardiac Arrest (OHCA)
Interventions
Registration Number
NCT04316611
Lead Sponsor
Assistance Publique - Hôpitaux de Paris
Brief Summary

The purpose of this study is to evaluate, in patients presenting with out-of-hospital cardiac arrest (OHCA) by ventricular fibrillation, refractory to 3 external electric shocks, the efficacy of a direct intravenous injection of 20 mmol KCl on their survival at hospital arrival.

Detailed Description

Out-of-hospital cardiac arrest (OHCA) has a poor prognosis, with an overall survival rate of about 5% at discharge. Shockable rhythm cardiac arrests (ventricular fibrillation (VF) and pulseless ventricular tachycardia) have a better prognosis.

In case of shockable rhythm, treatment is based on defibrillation, thereafter failure of 3 external electric shocks, on direct intravenous administration of 300 mg amiodarone, followed in case of ineffectiveness by an additional direct intravenous administration of 150 mg amiodarone. Lidocaine, which has long been used in this indication, is currently only recommended when amiodarone is unavailable or inefficient. Nevertheless, these 2 drugs, while they may be effective in converting refractory ventricular fibrillation to normal rhythm, have marked cardiodepressant effects (bradycardia, and/or negative inotropic effect) that persist after direct intravenous administration. This explains, at least partially, why a recent study did not show a significant difference in hospital discharge survival between amiodarone, lidocaine and placebo in patients presenting with OHCA by refractory ventricular fibrillation.

During surgical procedures under extracorporeal circulation, a cardioplegia solution is administered to interrupt cardiac activity and facilitate the surgical procedure. From a patho-physiological level, the mode of action of these solutions is based on a high concentration of potassium, which reduces the membrane resting potential of the myocytes. By extension, direct intravenous administration of 20 mmol potassium chloride (KCl) has been shown to convert ventricular fibrillation, resulting in a return to an hemodynamically efficient organized heart rate within a few minutes. The kalemia were at the upper limit of normal (5.5 mmol/l) 10 min after this injection, and normal at 20 min. A recent clinical case of a patient under extracorporeal circulation resuscitation, presenting with a refractory ventricular fibrillation, demonstrated the efficacy of direct intravenous injection of 3 g potassium chloride, resulting in a return to a sinus rhythm within a few minutes.

The immediate advantage of potassium chloride, compared to amiodarone (and also lidocaine), is the absence of cardiodepressant effect (bradycardia and/or hypotension) persisting after a while from the injection time. The mode of action of direct intravenous injection of potassium chloride to reduce ventricular fibrillation is indeed linked to the peak of hyperkalemia, whereas since the kalaemia are afterwards rapidly normalized in a few minutes, there is no persistent deleterious effect following this injection of potassium chloride. In addition, in the case of cardiac arrest, since the patient is already under continuous external cardiac chest compressions, no supplementary deleterious consequences related to this transient hyperkalemia are expected.

Direct intravenous injection of potassium chloride into a patient in out-of-hospital cardiac arrest with refractory ventricular fibrillation with 3 external electric shocks, instead of amiodarone, should interrupt this ventricular fibrillation and then allow a rapid return to an organized heart rhythm, and thus restore effective spontaneous cardiac activity.

Recruitment & Eligibility

Status
WITHDRAWN
Sex
All
Target Recruitment
Not specified
Inclusion Criteria
  • Adult patient (age 18 or over).
  • Patient suffering from an outpatient cardiac arrest of presumed cardiac origin and presenting refractory ventricular fibrillation despite 3 external electric shocks.
  • Patient with a health insurance plan.
Exclusion Criteria
  • Proven pregnancy.
  • Major incompetent (patient under guardianship or curatorship).
  • Patient who does not yet have a functional venous pathway after the 3 external electric shocks have been performed.

Study & Design

Study Type
INTERVENTIONAL
Study Design
SINGLE_GROUP
Arm && Interventions
GroupInterventionDescription
Potassium chloridePotassium chloridePotassium chloride
Primary Outcome Measures
NameTimeMethod
Survival at hospital admissionAt hospital admission up to 1 day

Survival (return of spontaneous circulation) at hospital admission

Secondary Outcome Measures
NameTimeMethod
Blood pressure at hospital admissionAt hospital admission, up to 1 day

Measurement of systolic and diastolic blood pressure when the patient arrives on the hospital ward

Number of pre-hospital return of spontaneous circulation (ROSC)Pre-hospital setting, up to 1 day

Return of spontaneous circulation in pre-hospital setting

Time to pre-hospital return of spontaneous circulation (ROSC)Pre-hospital setting, up to 1 day

Time, in minutes, from cardiac arrest to return of spontaneous circulation in pre-hospital setting

Total pre-hospital epinephrine dosePre-hospital setting, up to 1 day

Total epinephrine dose in mg administered in the pre-hospital setting

Total number of pre-hospital external electric shocksPre-hospital setting, up to 1 day

Total number of external electric shocks delivered in the pre-hospital setting

Total number of persistent or recurrent shockable rhythm disordersPre-hospital setting, up to 1 day

Total number of persistent or recurrent rhythm disorders requiring an external electric shock in pre-hospital setting

Total number of persistent or recurrent rhythm disorders requiring an external electric shock in pre-hospital setting

Total number of persistent or recurrent rhythm disorders requiring an external electric shock in pre-hospital setting

Heart rate at hospital admissionAt hospital admission, up to 1 day

Measurement of heart rate when the patient arrives on the hospital ward

Survival with good neurological outcome (Cerebral Performance Category (CPC) 1 or 2)at hospital dischargeAt hospital discharge, up to maximum 3 months

Survival with a good neurological prognosis (CPC scores 1 and 2) at hospital discharge

Survival with good neurological outcome (Cerebral Performance Category 1 or 2)at 3 monthsAt 3 months

Survival with a good neurological prognosis (CPC scores 1 and 2) at 3 months

Trial Locations

Locations (1)

AP-HP - SAMU de Paris

🇫🇷

Paris, France

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