Out-of-hospital cardiac arrest -optimal management

Cost-effectiveness of a community first responder system for out-of-hospital cardiac arrest in Belgium

OBJECTIVE

Out-of-hospital cardiac arrest (OHCA) is a major public health challenge across Europe, with a survival rate of only 8.5% to hospital discharge. Implementing a community first responder (CFR) system, including earlier Basic Life Support and defibrillation, can enhance survival rates and neurological outcomes. This study assesses the cost-effectiveness of two scenarios for implementing such a system in Belgium.

METHODS

A decision tree and the long-term Markov model were used to evaluate cost-effectiveness by comparing two scenarios with current care standards. Scenario 1 involved an awareness campaign on OHCA, while Scenario 2 included implementing a CFR system with automated external defibrillator (AED) integration, dispatch centre linkage and training for citizen responders. The analysis covered survival to the emergency department, hospital, discharge and neurologically intact survival, with sensitivity analyses to test robustness.

RESULTS

The awareness campaign and implementation of the CFR system resulted in an incremental cost-effectiveness ratio of €14,976 and €16,442 per quality-adjusted life year gained for scenarios 1 and 2, respectively. Both scenarios showed improvements in survival rates at various stages, including hospital discharge and neurologically intact survival.

CONCLUSION

This study highlights the benefits of enhancing Belgium's CFR for OHCA patients. It suggests that accessible AEDs, trained CFRs and an integrated emergency response system could improve survival rates and quality of life. These findings can guide policy and resource decisions, potentially improving the effectiveness and cost-efficiency of OHCA emergency services. Additionally, this approach could serve as a model for other regions aiming to strengthen their response to time-sensitive emergencies.

Cardiopulmonary resuscitation and basic life support guidelines for people with disability: a scoping review

PURPOSE

To explore literature, policies or procedures available to care providers on how to deliver CPR and BLS to people with a disability, for whom the current standard guidelines are not fit for purpose.

MATERIAL AND METHODS

A scoping review was conducted using four databases, namely, CINHAL, PubMed, Scopus, Medline and Google Scholar. Keywords used included, disab*, wheelchairs, cardiopulmonary, resuscitation, "basic life support", life support care, and bystander CPR. 1119 papers were retrieved and 1043 were screened following removal of 76 for duplication. 18 full text articles were reviewed and 5 met the inclusion criteria.

RESULTS

The five articles were from three counties and included one case study, three expert opinion papers and one intervention study. Four of the papers advocated in favour of improved CPR and BLS guidelines and three of the papers discussed techniques and ideas for supplementation of standard CPR and BLS.

CONCLUSION

The scoping review has uncovered a paucity of evidence explaining delivery of CPR and BLS for people with disability and highlights the need for further research. In the absence of further evidence, it is reasonable for educators to provide ideas and discussion about supplementing CPR and BLS for people with disability to carers.

Translation, Cross-Cultural Adaptation, and Validation of the Malay-Version of the Factors Influencing Community Willingness to Perform Cardiopulmonary Resuscitation and Use an Automated External Defibrillator Questionnaire

Limited factors influence community willingness to perform cardiopulmonary resuscitation and use an automated external defibrillator, making it difficult to take preventive and control measures to improve the survival of patients with out-of-hospital cardiac arrest. In this study, we translated and evaluated the Malay-language version of the cardiopulmonary resuscitation and an automated external defibrillator questionnaire. The translation and evaluation involved three phases: development, translation and cultural adaptation, and validation. Content validity was assessed by five experts, and demonstrated a content validity index of 0.98 and a Fleiss kappa index of 0.159. Construct validity for the multi-item scale performed using factor analysis and involving 100 participants was 0.777. Factor analysis using the varimax rotation method demonstrated the appropriateness of the data in the exploratory factor analysis. Cronbach’s alpha was 0.849, suggesting high reliability. Test–retest reliability involving 45 participants calculated using the intraclass correlation coefficient had a value of 0.723. The findings demonstrate that the Malay-version FIXED questionnaire is a valid and reliable instrument and is ready to be used by health care workers and policymakers to evaluate the factors influencing the community’s willingness to perform cardiopulmonary resuscitation and use an automated external defibrillator.

Out-of-hospital cardiac arrest patients with implantable cardioverter-defibrillators: What are their outcomes?

THE AIM OF THE STUDY

To identify the prognostic factors and effects of implantable cardioverter-defibrillators (ICDs) in out-of-hospital cardiac arrest (OHCA) patients with ICDs because the clinical characteristics and outcomes of OHCA patients with ICDs are unknown.

METHODS

The North American Resuscitation Outcomes Consortium (ROC) Cardiac Epistry Version 3 dataset was analyzed. Eligible patients were divided into OHCA patients with and without ICDs. Multivariable regressions were employed to analyze.

RESULTS

Of 51,634 eligible OHCA patients, 581 (1.13%) had implanted ICDs. Among them, 53 (9.1%) patients survived to hospital discharge, and 40 (6.9%) patients had favorable neurological outcome at hospital discharge. Multivariable regression showed ICDs were not associated with OHCA outcomes in the total OHCA patients. In the OHCA patients with ICDs, shockable initial emergency medical services (EMS)-recorded rhythms and the ICD-shock-only defibrillation pattern were independent favorable factors for survival to hospital discharge(OR = 3.3, 95%CI 1.7-6.2, P < 0.001; OR = 2.4, 95%CI 1.1-5.5, P = 0.035, respectively) and neurological outcome at hospital discharge (OR = 6.5, 95%CI 2.9-14.4, P < 0.001; OR = 3.6, 95%CI 1.4-9.1, P = 0.006, respectively). During field resuscitation in OHCA patients with ICDs, at least 34.9% of total patients and 64.6% of patients with initial EMS-recorded VT/VF rhythms needed additional external shocks.

CONCLUSIONS

Shockable initial EMS-recorded rhythms and ICD-shock-only defibrillation pattern were independent factors for the favorable outcomes of OHCA patients with ICDs. ICDs were not associated with the outcomes of OHCA, and additional external shocks were needed in a substantial number of OHCA patients with ICDs during field resuscitation.

Therapeutic hypothermia after out of hospital cardiac arrest improve 1-year survival rate for selective patients

Background

Therapeutic Hypothermia (TH) is a standard of care after out-of-hospital cardiac arrest (OHCA). Previous reports failed to prove a significant benefit for survival or neurological outcomes. We examined whether the proper selection of patients would enhance treatment efficacy.

Method

We conducted a retrospective cohort study. Data was collected from January 2000 and August 2018. Patients were enrolled after OHCA and classified into two groups, patients treated with TH and patients who were not treated with TH.

Results

A total of 92 patients were included in the study. 57 (63%) patients were in the TH Group and 34 (37%) in the Non-TH group. There was no statistical difference in favorable neurological outcomes between the groups. Patients presenting with ventricular fibrillation had a higher 1-year survival rate from TH, while patients with asystole were found to benefit only if they were younger than 65 years (p < .007, p < .02, respectively).

Conclusion

Therapeutic Hypothermia patients failed to demonstrate a significant benefit in terms of improved neurological outcomes. Patients treated with TH following ventricular fibrillation experienced the most benefit in terms of 1-year survival, while patients who had suffered from asystole experienced a modest benefit only if they were younger than 65 years of age. Guidelines should address age and primary arrhythmia for proper treatment selection.

Hyperspectral near-infrared spectroscopy assessment of the brain during hypoperfusion

Two-thirds of out-of-hospital cardiac arrest patients, who survive to hospital admission, die in the hospital from neurological injuries related to cerebral hypoperfusion. Therefore, noninvasive real-time monitoring of the cerebral oxygen metabolism in cardiac arrest patients is extremely important. Hyperspectral near-infrared spectroscopy (hNIRS) is a noninvasive technique that measures concentrations of the key chromophores in the brain, such as oxygenated hemoglobin, deoxygenated hemoglobin, and cytochrome C oxidase (CCO), an intracellular marker of oxygen consumption. We tested hNIRS on 10 patients undergoing transcatheter aortic valve insertion, where rapid ventricular pacing (RVP) is required to temporarily induce sudden hypotension and hypoperfusion that mimic cardiac arrest. Using multidistance hNIRS, we found that tissue oxygen saturation changes in the cerebral tissue were lower than those in the scalp during RVP. CCO redox changes were detected in cerebral tissue but not in the scalp during RVP. We have demonstrated that hNIRS is feasible and can detect sudden changes in cerebral oxygenation and metabolism in patients during profound hypotension.

Witnessed out-of-hospital cardiac arrest- effects of emergency dispatch recognition

BACKGROUND

Survival from an out-of-hospital cardiac arrest (OHCA) depends on the sequence of interventions in "the chain of survival". If OHCA is recognized in the emergency medical communication centre (EMCC), the proper emergency medical service (EMS) should be dispatched and cardiopulmonary resuscitation (CPR) instructions should be given to a bystander. The study aimed to examine the impact of OHCA recognition in the EMCC on survival rates and the main elements of the chain of survival.

METHODS

Data from the Helsinki University Hospital's registry of OHCA patients between 1997 and 2013 were studied. Altogether, 2054 EMCC-handled and bystander-witnessed OHCA proven events of cardiac origin were analysed.

RESULTS

In 80.5% of the victims, two EMS units were correctly dispatched and the OHCA was classified as recognized. Achieved return of spontaneous circulation (ROSC) and survival to hospital discharge were 49% and 23%, respectively, if cardiac arrest was recognized by the EMCC and 40% and 16% when it was not (P = 0.003 and 0.002). Dispatchers gave CPR instructions in 60% of the recognized OHCA cases. Bystander-performed CPR increased over time and was given in 58% of the recognized OHCAs and also in 17% of the unrecognized events. EMS delays were shorter if OHCA was recognized as opposed to unrecognized (8 min with an IQR 6.5-10 min vs. 9 min with an IQR 6.5-11 min; P = 0.001).

CONCLUSIONS

Recognition of OHCA by the EMCC was significantly associated with an increased rate of bystander-performed CPR, reduced EMS response time, and increased OHCA patient ROSC and survival rates.

Early recognition of sudden cardiac arrest in athletes during sports activity

INTRODUCTION

Sudden cardiac arrest (SCA) in athletes is an unexpected life-threatening event, which is often not recognised early and cardiopulmonary resuscitation (CPR) is not always initiated immediately. We describe key features to rapidly recognise non-traumatic SCA in athletes during sports activity.

METHODS

We reviewed videos and images of athletes suffering from non-traumatic SCA during sports activity. We searched Google images, Google videos and YouTube.com using the keywords 'sudden cardiac death athlete' and 'resuscitation athlete'. We analysed (1) the athlete's performance before syncope, (2) the athlete's performance at the start of syncope, (3) the position of the body, and (4) the athlete's facial expressions before CPR. We analysed our data by describing these four features to answer our research question.

RESULTS

We analysed the sequence of events in six well-known soccer players in whom a camera-witnessed non-traumatic SCA occurred during their athletic activity. All six athletes showed no changes before syncope. Four became unstable while standing and unexpectedly collapsed falling on their back. Two suddenly 'dropped dead' and fell face down. All six had their eyes wide open with a fixed gaze and fixed pupils.

CONCLUSIONS

Sudden unexpected loss of consciousness in an athlete in action and a fixed gaze eye position are key features of SCA. Immediate cardiac massage should follow. The described features to immediately recognise SCA in athletes during sports activity should be taught to everyone involved in athletic activity leading to earlier recognition of SCA followed by earlier CPR.

The influence of targeted temperature management on the pharmacokinetics of drugs administered during and after cardiac arrest: a systematic review

OBJECTIVE

Pharmacokinetic parameters of drugs are widely investigated under normothermic conditions and normal hemodynamic parameters. The European Resuscitation Council recommends the use of targeted temperature management (TTM) with a target temperature of 34 °C in cardiac arrest (CA) patients. The aim of this literature review is to investigate the influence of CA combined with TTM on the pharmacokinetics of drugs. Results of preclinical and clinical studies are compared with each other. Only the most important drugs, administered during CA in emergency setting, were studied.

METHODS

A literature search was conducted within PubMed and Google Scholar. The search terms included 'therapeutic hypothermia', 'TTM', 'drug metabolism', 'pharmacokinetics during hypothermia', 'cardiac arrest/etiology'. In Pubmed, MeSH-terms were also included: 'myocardial infarction/therapy', 'heart arrest/complications' and 'hypothermia'. To search for preclinical studies: the search terms 'pigs' and 'swine' were used. After the primary shift of relevant findings, further articles were found through references of these (snowballing method), as well as through related articles as suggested by the databases.

RESULTS

Due to the reduced cardiac output during TTM, most of the distribution volume ([Formula: see text]) of drugs included in this literature study is decreased. Only the [Formula: see text] of chlorzoxazone in CA rats and midazolam in non-CA patients are significantly increased during respectively deep and mild hypothermia. The renal, hepatic and biliary clearance of drugs administered during CA/TTM/hypothermia are decreased.

DISCUSSION

The combination of a decreased [Formula: see text] and a decrease in the metabolization/excretion of drugs during CA/TTM result in higher plasma concentrations compared to the plasma concentrations during CA without TTM.