Bystander CPR, ventricular fibrillation, and survival in witnessed, unmonitored out-of-hospital cardiac arrest

Resuscitation ◽  
1996 ◽  
Vol 31 (1) ◽  
pp. 83-84 ◽  
Author(s):  
RA Swor ◽  
RE Jackson ◽  
M Cynar ◽  
E Sadler ◽  
E Basse ◽  
...  
Keyword(s):  
Cardiac Arrest ◽  
Ventricular Fibrillation ◽  
Bystander Cpr ◽  
Hospital Cardiac Arrest

scholarly journals Insights From the Ventricular Fibrillation Waveform Into the Mechanism of Survival Benefit From Bystander Cardiopulmonary Resuscitation

2021 ◽  
Vol 10 (19) ◽  
Author(s):  
Brooke Bessen ◽  
Jason Coult ◽  
Jennifer Blackwood ◽  
Cindy H. Hsu ◽  
Peter Kudenchuk ◽  
...  
Keyword(s):  
Cardiac Arrest ◽  
Ventricular Fibrillation ◽  
Cardiopulmonary Resuscitation ◽  
Survival Benefit ◽  
Amplitude Spectrum ◽  
Peak Frequency ◽  
Spectrum Area ◽  
Bystander Cardiopulmonary Resuscitation ◽  
Bystander Cpr ◽  
Hospital Cardiac Arrest

Background The mechanism by which bystander cardiopulmonary resuscitation (CPR) improves survival following out‐of‐hospital cardiac arrest is unclear. We hypothesized that ventricular fibrillation (VF) waveform measures, as surrogates of myocardial physiology, mediate the relationship between bystander CPR and survival. Methods and Results We performed a retrospective cohort study of adult, bystander‐witnessed patients with out‐of‐hospital cardiac arrest with an initial rhythm of VF who were treated by a metropolitan emergency medical services system from 2005 to 2018. Patient, resuscitation, and outcome variables were extracted from emergency medical services and hospital records. A total of 3 VF waveform measures (amplitude spectrum area, peak frequency, and median peak amplitude) were computed from a 3‐second ECG segment before the initial shock. Multivariable logistic regression estimated the association between bystander CPR and survival to hospital discharge adjusted for Utstein elements. Causal mediation analysis quantified the proportion of survival benefit that was mediated by each VF waveform measure. Of 1069 patients, survival to hospital discharge was significantly higher among the 814 patients who received bystander CPR than those who did not (0.52 versus 0.43, respectively; P <0.01). The multivariable‐adjusted odds ratio for bystander CPR and survival was 1.6 (95% CI, 1.2, 2.1), and each VF waveform measure attenuated this association. Depending on the specific waveform measure, the proportion of mediation varied: 53% for amplitude spectrum area, 31% for peak frequency, and 29% for median peak amplitude. Conclusions Bystander CPR correlated with more robust initial VF waveform measures, which in turn mediated up to one‐half of the survival benefit associated with bystander CPR. These results provide insight into the biological mechanism of bystander CPR in VF out‐of‐hospital cardiac arrest.

Bystander CPR, Ventricular Fibrillation, and Survival in Witnessed, Unmonitored Out-of-Hospital Cardiac Arrest

1995 ◽  
Vol 25 (6) ◽  
pp. 780-784 ◽  
Author(s):  
Robert A Swor ◽  
Raymond E Jackson ◽  
Mark Cynar ◽  
Edward Sadler ◽  
Eliezer Basse ◽  
...  
Keyword(s):  
Cardiac Arrest ◽  
Ventricular Fibrillation ◽  
Bystander Cpr ◽  
Hospital Cardiac Arrest

Outcomes and In-hospital Treatment of Out-of-Hospital Cardiac Arrest Patients Resuscitated From Ventricular Fibrillation by Early Defibrillation

2004 ◽  
Vol 79 (5) ◽  
pp. 613-619 ◽  
Author(s):  
T. Jared Bunch ◽  
Roger D. White ◽  
Bernard J. Gersh ◽  
Win-Kuang Shen ◽  
Stephen C. Hammill ◽  
...  
Keyword(s):  
Cardiac Arrest ◽  
Ventricular Fibrillation ◽  
Hospital Treatment ◽  
Early Defibrillation ◽  
Hospital Cardiac Arrest

scholarly journals 156 Prehospital determinants of successful resuscitation after traumatic and non-traumatic out-of-hospital cardiac arrest

2020 ◽  
Vol 37 (12) ◽  
pp. 825.1-825
Author(s):  
Ed Barnard ◽  
Daniel Sandbach ◽  
Tracy Nicholls ◽  
Alastair Wilson ◽  
Ari Ercole
Keyword(s):  
Overall Survival ◽  
Cardiac Arrest ◽  
Hospital Admission ◽  
Hospital Discharge ◽  
Multivariable Analysis ◽  
Discharge Data ◽  
Successful Resuscitation ◽  
Bystander Cpr ◽  
Number Percentage ◽  
Hospital Cardiac Arrest

Aims/Objectives/BackgroundOut-of-hospital cardiac arrest (OHCA) is prevalent in the UK. Reported survival is lower than in countries with comparable healthcare systems; a better understanding of outcome determinants may identify areas for improvement. Aim: to compare differential determinants of survival to hospital admission and survival to hospital discharge for traumatic (TCA) and non-traumatic cardiac arrest (NCTA).Methods/DesignAn analysis of 9109 OHCA in East of England between 1 January 2015 and 31 July 2017. Univariate descriptives and multivariable analysis were used to understand the determinants of survival for NTCA and TCA. Two Utstein outcome variables were used: survival to hospital admission and hospital discharge. Data reported as number (percentage), number (percentage (95% CI)) and median (IQR) as appropriate. Continuous data have been analysed with a Mann-Whitney U test, and categorical data have been analysed with a χ2 test. Analyses were performed using the R statistical programming language.Results/ConclusionsThe incidence of OHCA was 55.1 per 100 000 population/year. The overall survival to hospital admission was 27.6% (95%CI 26.7% to 28.6%) and the overall survival to discharge was 7.9% (95%CI 7.3% to 8.5%). Survival to hospital admission and survival to hospital discharge were both greater in the NTCA group compared with the TCA group: 27.9% vs 19.3% p=0.001, and 8.0% vs 3.8% p=0.012 respectively.Determinants of NTCA and TCA survival were different, and varied according to the outcome examined. In NTCA, bystander cardiopulmonary resuscitation (CPR) was associated with survival at discharge but not at admission, and the likelihood of bystander-CPR was dependent on geographical socioeconomic status.NTCA and TCA are clinically distinct entities with different predictors for outcome and should be reported separately. Determinants of survival to hospital admission and discharge differ in a way that likely reflects the determinants of neurological injury. Bystander CPR public engagement may be best focused in more deprived areas.

scholarly journals Outcomes of out-of-hospital cardiac arrest in Beijing: a 5-year cross-sectional study

BMJ Open ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. e041917
Author(s):  
Fei Shao ◽  
Haibin Li ◽  
Shengkui Ma ◽  
Dou Li ◽  
Chunsheng Li
Keyword(s):  
Cardiac Arrest ◽  
Urban Areas ◽  
Patient Characteristics ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Term Survival ◽  
Shockable Rhythm ◽  
Bystander Cpr ◽  
Hospital Cardiac Arrest

ObjectiveThe purpose of this study was to assess the trends in outcomes of out-of-hospital cardiac arrest (OHCA) in Beijing over 5 years.DesignCross-sectional study.MethodsAdult patients with OHCA of all aetiologies who were treated by the Beijing emergency medical service (EMS) between January 2013 and December 2017 were analysed. Data were collected using the Utstein Style. Cases were followed up for 1 year. Descriptive statistics were used to characterise the sample and logistic regression was performed.ResultsOverall, 5016 patients with OHCA underwent attempted resuscitation by the EMS in urban areas of Beijing during the study period. Survival to hospital discharge was 1.2% in 2013 and 1.6% in 2017 (adjusted rate ratio=1.0, p for trend=0.60). Survival to admission and neurological outcome at discharge did not significantly improve from 2013 to 2017. Patient characteristics and the aetiology and location of cardiac arrest were consistent, but there was a decrease in the initial shockable rhythm (from 6.5% to 5.6%) over the 5 years. The rate of bystander cardiopulmonary resuscitation (CPR) increased steadily over the years (from 10.4% to 19.4%).ConclusionSurvival after OHCA in urban areas of Beijing did not improve significantly over 5 years, with long-term survival being unchanged, although the rate of bystander CPR increased steadily, which enhanced the outcomes of patients who underwent bystander CPR.

Abstract 16924: Initial AMSA and Increased AMSA After CPR Predict Second Shock Success in Initially Shock-resistant VF During Out-of-hospital Cardiac Arrest

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Ulrich Herken ◽  
Weilun Quan
Keyword(s):  
Logistic Regression ◽  
Cardiac Arrest ◽  
Ventricular Fibrillation ◽  
Success Rate ◽  
Fourier Transformation ◽  
Amplitude Spectrum ◽  
Fast Fourier Transformation ◽  
Shock Delivery ◽  
Spectrum Area ◽  
Hospital Cardiac Arrest

Purpose: Amplitude spectrum area (AMSA), which is calculated from the ventricular fibrillation (VF) waveform using fast Fourier transformation, has been recognized as a predictor of successful defibrillation (DF) and as an index of myocardial perfusion and viability during resuscitation. In this study, we investigated whether a change in AMSA occurring during CPR would predict DF outcome for subsequent DF attempts after a failed DF. We hypothesized that a patient responding to CPR with an increase in AMSA would have an increased likelihood of DF success. Methods: This was a retrospective analysis of out-of-hospital cardiac arrest patients who received a second DF due to initially shock-resistant VF. A total of 193 patients with an unsuccessful first DF were identified in a manufacturer database of electrocardiographic defibrillator records. AMSA was calculated for the first DF (AMSA1) and the second DF (AMSA2) during a 2.1 sec window ending 0.5 sec prior to DF. A successful DF attempt was defined as the presence of an organized rhythm with a rate ≥ 40 / min starting within 60 sec from the DF and lasting for > 30 sec. After the failed first DF, all patients received CPR for 2 to 3 minutes before delivery of the second DF. Change in AMSA (dAMSA) was calculated as dAMSA = AMSA2 - AMSA1. Results: The overall second DF success rate was 14.5%. Multivariable logistic regression showed that both AMSA1 and dAMSA were independent predictors of second DF success with odds ratios of 1.24 (95% CI 1.12 - 1.38, p<0.001) and 1.27 (95% CI 1.16 - 1.41, p<0.001) for each mVHz change in AMSA or dAMSA, respectively. Conclusions: In initially DF-resistant VF, a high initial AMSA value predicted an increased likelihood of second shock success. An increase of AMSA in response to CPR also predicted a higher second shock success rate. Monitoring of AMSA during resuscitation therefore may be useful to guide CPR efforts, possibly including timing of second shock delivery. These findings also further support the value of AMSA as indicator of myocardial viability.

Abstract 184: AED Application in Non-Shockable Out-of-Hospital Cardiac Arrest Does Not Reduce Survival

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_2) ◽  
Author(s):  
Ross A Pollack ◽  
Siobhan P Brown ◽  
Thomas Rea ◽  
Peter J Kudenchuk ◽  
Myron L Weisfeldt
Keyword(s):  
Cardiac Arrest ◽  
Primary Outcome ◽  
Patient Characteristics ◽  
Neurological Status ◽  
Relative Safety ◽  
Initial Rhythm ◽  
Bystander Cpr ◽  
Rhythm Analysis ◽  
In Transit ◽  
Hospital Cardiac Arrest

Introduction: It is well established that AEDs improve outcome in shockable out-of-hospital cardiac arrest (OHCA). An increasing proportion (now the majority) of OHCAs present with non-shockable rhythms. Survival from non-shockable OHCA depends on high-quality CPR in transit to definitive care. Studies of AED use in non-shockable in-hospital arrest (as opposed to OHCA) have shown reduced survival with AED application possibly due to CPR interruptions to apply pads and perform rhythm analysis. We sought to determine whether AED application in non-shockable public, witnessed OHCA has a significant association with survival to discharge. Methods: This is a retrospective analysis of OHCA from 2010-2015 at 10 Resuscitation Outcomes Consortium centers. All adult, public, witnessed non-shockable OHCAs were included. Non-shockable arrest was defined as no shock delivered by the AED or by review of defibrillator tracings (10%). The initial rhythm on EMS arrival was used to confirm the rhythm. The primary outcome was survival to hospital discharge with favorable neurological status (modified rankin score <3). The OR was adjusted for the Utstein variables. Results: During the study period there were 1,597 non-shockable public, witnessed OHCA, 9.8% of which had an AED applied. The initial rhythm on EMS arrival was PEA or asystole in 86% of cases. Significantly more OHCA in the AED applied group had CPR performed. 6.5% of those without an AED applied survived with favorable neurologic status compared to 9% with an AED. After adjustment for the Utstein variables including bystander CPR, the aOR for survival with favorable neurologic outcome was 1.38 (95% CI:0.72-2.65). Conclusion: After adjusting for patient characteristics and bystander CPR, the application of an AED in non-shockable public witnessed OHCA had no significant association with survival or neurological outcome supporting the relative safety and potential benefit of AED application in non-shockable OHCA.

Abstract 170: Challenges in Implementing an ECPR Program for Out of Hospital Cardiac Arrest

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_2) ◽  
Author(s):  
Meshe Chonde ◽  
Jeremiah Escajeda ◽  
Jonathan Elmer ◽  
Frank X Guyette ◽  
Arthur Boujoukos ◽  
...  
Keyword(s):  
Cardiac Arrest ◽  
Inclusion Criteria ◽  
Extracorporeal Cardiopulmonary Resuscitation ◽  
Implementation Challenges ◽  
Shockable Rhythm ◽  
Bystander Cpr ◽  
Stay And Play ◽  
Load And Go ◽  
Mechanical Cpr ◽  
Hospital Cardiac Arrest

Introduction: Extracorporeal cardiopulmonary resuscitation (ECPR) can treat cardiac arrest refractory to conventional therapy. Many institutions are interested in developing their own ECPR program. However, there are challenges in logistics and implementation. Hypothesis: Development of an ECPR team and identification of UPMC Presbyterian as a receiving center will increase recognition of potential ECPR candidates. Methods: We developed an infrastructure of Emergency Medical Services (EMS), Medic Command, and an in-hospital ECPR team. We identified inclusion criteria for patients with an out of hospital cardiac arrest (OHCA) likely to have a reversible arrest etiology and developed them into a simple checklist. These criteria were: witnessed arrest with bystander CPR, shockable rhythm, and ages 18 to 60. We trained local EMS crews to screen patients and review the checklist with a Command Physician prior to transport to our hospital. Results: From October 2015 to March 31 st 2018, there were 1165 dispatches for OHCA, of which 664 (57%) were treated and transported to the hospital and 120 to our institution. Of these, five patients underwent ECPR. Of the remaining cases, 64 (53%) had nonshockable rhythms, 48 (40%) were unwitnessed arrests, 50 (42%) were over age 60 and the remaining 20 (17%) had no documented reasons for exclusion. Prehospital CPR duration was 26 [IQR 25-40] min. Four patients (80%) underwent mechanical CPR with LUCAS device. Time from arrest to arrive on scene was 5 [IQR 4-6] min and time call MD command was 13 [IQR 7-21] min. Time to transport was 20 [IQR 19-21] min. Time from arrest to initiation of ECMO was 63 [IQR 59-69] min. Conclusions: ECPR is a relatively infrequent occurrence. Implementation challenges include prompt identification of patients with reversible OHCA causes, preferential transport to an ECPR capable facility and changing the focus of EMS in these select patients from a “stay and play” to a “load and go” mentality.

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