Outcomes in unsuccessful field resuscitation attempts

The Current Discussion Regarding End-of-Life Care for Patients with Out-of-Hospital Cardiac Arrest with Initial Non-Shockable Rhythm: A Narrative Review

Despite recent advances in resuscitation science, outcomes in patients with out-of-hospital cardiac arrest (OHCA) with initial non-shockable rhythm remains poor. Those with initial non-shockable rhythm have some epidemiological features, including the proportion of patients with a witnessed arrest, bystander cardiopulmonary resuscitation (CPR), age, and presumed etiology of cardiac arrest have been reported, which differ from those with initial shockable rhythm. The discussion regarding better end-of-life care for patients with OHCA is a major concern among citizens. As one of the efforts to avoid unwanted resuscitation, advance directive is recognized as a key intervention, safeguarding patient autonomy. However, several difficulties remain in enhancing the effective use of advance directives for patients with OHCA, including local regulation of their use, insufficient utilization of advance directives by emergency medical services at the scene, and a lack of established tools for discussing futility of resuscitation in advance care planning. In addition, prehospital termination of resuscitation is a common practice in many emergency medical service systems to assist clinicians in deciding whether to discontinue resuscitation. However, there are also several unresolved problems, including the feasibility of implementing the rules for several regions and potential missed survivors among candidates for prehospital termination of resuscitation. Further investigation to address these difficulties is warranted for better end-of-life care of patients with OHCA.

The Death Watch: Certifying Death Using Cardiac Criteria

In the past, inadequate diagnostic instruments sometimes led to incorrect diagnoses of death, so careful and prolonged observation—the “death watch”—was required. Diagnostic instruments are now accurate and determining the presence or absence of circulation and cerebral function is easy in virtually all cases. Still, ambiguity and controversy in diagnosing death persists because the current criteria, irreversible cessation of cardiac or whole brain function, are ambiguous. Recent reintroduction of Non—Heart-beating organ donation has highlighted the controversy. Data on the ability to achieve restoration of spontaneous circulation are quite consistent, but they support several different sets of reasonable death criteria. This article concludes with a rejection of a fixed notion of “irreversibility” because it does not conform to current practice, is potentially deleterious to social events at the time of death, and the reversibility of cardiopulmonary arrest is dependent on available means of resuscitation. Finally, the time required to ensure irreversible cessation of cardiac function despite potential intervention is too broad to be clinically applicable and is unreasonable. Diagnosis of death should be based on the context in which it occurs because the medical means available determine what is irreversible.

Prehospital vs. emergency department pronouncement of death: a cost analysis

Objective:

National survival rates for out-of-hospital cardiac arrests are less than 5%, and substantial resources are associated with transporting cardiac arrest victims to hospital for emergency department (ED) resuscitation. The low overall survival rate and the identification of predictors of unsuccessful resuscitation have opened debate on the “futility” of transporting such patients to the ED. This study compares the costs of prehospital pronouncement of death to the costs of transporting patients to a hospital ED for physician pronouncement.

Methods:

The study was a retrospective chart review on a matched cohort of out-of-hospital cardiac arrest patients. Patients were included if documentation was adequate and ambulance response time was less than 8 minutes. A cohort of 20 patients pronounced dead in the field were matched to 20 patients pronounced dead in an ED. Cases were matched on 6 evidence-based predictors of unsuccessful resuscitation. Direct medical costs and mean physician and prehospital provider times were compared.

Results:

The total cost of pronouncement of death in the ED was $45.35 higher than the cost of field pronouncement (p < 0.001). Paramedics spent more time delivering care when death was pronounced in the field (83.3 vs. 55.9 min; p < 0.001). Base hospital physicians spent more time when patients were transported to hospital for ED pronouncement (16.3 vs. 4.3 min; p < 0.001). Total provider time for field pronouncement was 15.5 min longer (p = 0.004), but field pronouncement consumed 12.0 min less physician time.

Conclusions:

Paramedic pronouncement of death in the field is less costly than transporting patients to hospital for physician pronouncement. Pronouncement in the field requires more paramedic time but less physician time.

Year in review 2013: Critical Care--out-of-hospital cardiac arrest, traumatic injury, and other emergency care conditions

In this review, we discuss articles published in 2013 contributing to the existing literature on the management of out-of-hospital cardiac arrest and the evaluation and management of several other emergency conditions, including traumatic injury. The utility of intravenous medications, including epinephrine and amiodarone, in the management of cardiac arrest is questioned, as are cardiac arrest termination-of-resuscitation rules. Articles discussing mode of transportation in trauma are evaluated, and novel strategies for outcome prediction in traumatic injury are proposed. Diagnostic strategies, including computerized tomography scan for the diagnosis of smoke inhalation injury and serum biomarkers for the diagnosis of post-cardiac arrest syndrome and acute aortic dissection, are also explored. Although many of the articles discussed raise more questions than they answer, they nevertheless provide ample opportunity for further investigation.

Pre-arrest predictors of survival after resuscitation from out-of-hospital cardiac arrest in the elderly a systematic review

Background

To enable older people to make decisions about the appropriateness of cardiopulmonary resuscitation (CPR), information is needed about the predictive value of pre-arrest factors such as comorbidity, functional and cognitive status on survival and quality of life of survivors. We systematically reviewed the literature to identify pre-arrest predictors for survival, quality of life and functional outcomes after out-of-hospital (OHC) CPR in the elderly.

Methods

We searched MEDLINE (through May 2011) and included studies that described adults aged 70 years and over needing CPR after OHC cardiac arrest. Prognostic factors associated with survival to discharge and quality of life of survivors were extracted. Two authors independently appraised the quality of each of the included studies. When possible a meta-analysis of odd’s ratios was performed.

Results

Twenty-three studies were included (n = 44,582). There was substantial clinical and statistical heterogeneity and reporting was often inadequate. The pooled survival to discharge in patients >70 years was 4.1% (95% CI 3.0-5.6%). Several studies showed that increasing age was significantly associated with worse survival, but the predictive value of comorbidity was investigated in only one study. In another study, nursing home residency was independently associated with decreased chances of survival. Only a few small studies showed that age is negatively associated with a good quality of life of survivors. We were unable to perform a meta-analysis of possible predictors due to a wide variety in reporting and statistical methods.

Conclusions

Although older patients have a lower chance of survival after CPR in univariate analysis (i.e. 4.1%), older age alone does not seem to be a good criterion for denying patients CPR. Evidence for the predictive value of comorbidities and for the predictive value of age on quality of life of survivors is scarce. Future studies should use uniform methods for reporting data and pre-arrest factors to increase the available evidence about pre arrest factors on the chance of survival. Furthermore, patient-specific outcomes such as quality of life and post-arrest cognitive function should be investigated too.

Factors affecting survival after prehospital asystolic cardiac arrest in a Basic Life Support-Defibrillation system

OBJECTIVES

Previous studies have shown a low but meaningful survival rate in cases of prehospital cardiac arrest with an initial rhythm of asystole. There may be, however, an identifiable subgroup in which resuscitation efforts are futile. This study identified potential field criteria for predicting 100% nonsurvival when the presenting rhythm is asystole in a Basic Life Support-Defibrillation (BLS-D) system.

METHODS

This prospective cohort study, a component of Phases I and II of the Ontario Prehospital Advanced Life Support (OPALS) Study, was conducted in 21 Ontario communities with BLS-D level of care, and included all adult arrests of presumed cardiac etiology according to the Utstein Style Guidelines. Analyses included descriptive and appropriate univariate tests, as well as multivariate stepwise logistic regression to determine predictors of survival.

RESULTS

From 1991 to 1997, 9899 consecutive cardiac arrest cases with the following characteristics: male (67.2%), bystander-witnessed (44.7%), bystander CPR (14.2%), call response interval (CRI) </= 8 minutes (82%) and overall survival (4.3%) were enrolled. Of 9529 cases with available rhythm strip recordings, initial arrest rhythms were asystole in 40.8%, pulseless electrical activity in 21.2% and ventricular fibrillation or ventricular tachycardia in 38%. Of 3888 asystolic patients, 9 (0.2%) survived to discharge; 3 of these cases were unwitnessed arrests with no bystander CPR. There were no survivors if the CRI exceeded 8 minutes. Logistic regression analysis demonstrated that independent predictors of survival to admission were "CRI in minutes" (odds ratio [OR] = 0.87; 95% confidence interval [CI], 0.77-0.98) and "bystander-witnessed" (OR = 2.6; 95% CI, 1.5-4.4).

CONCLUSIONS

In a BLS-D system, there is a very low but measurable survival rate for prehospital asystolic cardiac arrest. CRIs of over 8 minutes were associated with 100% nonsurvival, whereas unwitnessed arrests with no bystander CPR were not. These data add to the growing literature that will help guide ethical decision-making for protocol development in emergency medical services systems.

Analysis of Prehospital Scene Time and Survival from Out-of-Hospital, Non-Traumatic, Cardiac Arrest

The purpose of this study was to determine whether shorter prehospital scene time (ST) is associated with an increased survival rate in non-traumatic, out-of-hospital, cardiac arrest (CA) in a medium-sized, metropolitan EMS system. Information was retrieved for all adult victims (age ≥18 years) of CA treated and transported by a metropolitan fire department over a 16month period (6/87–9/88). Data were retrieved from the fire department's database, hospital records, and death certificates. Statistical analysis of continuous variables was performed using the two-tailed, Student's t-test and non-parametric evaluations were performed by square analysis with p<0.05 considered significant. Two hundred ninety-eight cases were recorded of which 293 patients (98.3%) had documented ST (study group). Seventy-nine patients (27.0%) had ST <12 minutes, while 214 (73.0%) had ST≥12 minutes. Patients with ST <12 minutes were more likely to have return of spontaneous circulation in the field (26.6% vs. 15.9%, p<0.05) and also were more likely to survive than were patients with ST ≥12 minutes (13.9% vs. 6.5%, p<0.05). Mean ST for survivors was significantly less than for non-survivors (12.8 vs. 15.3 min., p<0.05).

We conclude that, in our system, adult victims of CA with ST <12 minutes are more likely to survive than are patients with longer ST. In addition, the mean ST for survivors is shorter than for non-survivors. It remains unclear whether shorter ST actually has an impact on survival or is merely a reflection of a sub-group with rapid resuscitation and consequently a higher likelihood of survival. Future investigations are needed to determine whether shorter ST actually impacts the likelihood of survival from CA.

Predictors of survival from out-of-hospital cardiac arrest: a systematic review and meta-analysis

BACKGROUND

Prior studies have identified key predictors of out-of-hospital cardiac arrest (OHCA), but differences exist in the magnitude of these findings. In this meta-analysis, we evaluated the strength of associations between OHCA and key factors (event witnessed by a bystander or emergency medical services [EMS], provision of bystander cardiopulmonary resuscitation [CPR], initial cardiac rhythm, or the return of spontaneous circulation). We also examined trends in OHCA survival over time.

METHODS AND RESULTS

An electronic search of PubMed, EMBASE, Web of Science, CINAHL, Cochrane DSR, DARE, ACP Journal Club, and CCTR was conducted (January 1, 1950 to August 21, 2008) for studies reporting OHCA of presumed cardiac etiology in adults. Data were extracted from 79 studies involving 142 740 patients. The pooled survival rate to hospital admission was 23.8% (95% CI, 21.1 to 26.6) and to hospital discharge was 7.6% (95% CI, 6.7 to 8.4). Stratified by baseline rates, survival to hospital discharge was more likely among those: witnessed by a bystander (6.4% to 13.5%), witnessed by EMS (4.9% to 18.2%), who received bystander CPR (3.9% to 16.1%), were found in ventricular fibrillation/ventricular tachycardia (14.8% to 23.0%), or achieved return of spontaneous circulation (15.5% to 33.6%). Although 53% (95% CI, 45.0% to 59.9%) of events were witnessed by a bystander, only 32% (95% CI, 26.7% to 37.8%) received bystander CPR. The number needed to treat to save 1 life ranged from 16 to 23 for EMS-witnessed arrests, 17 to 71 for bystander-witnessed, and 24 to 36 for those receiving bystander CPR, depending on baseline survival rates. The aggregate survival rate of OHCA (7.6%) has not significantly changed in almost 3 decades.

CONCLUSIONS

Overall survival from OHCA has been stable for almost 30 years, as have the strong associations between key predictors and survival. Because most OHCA events are witnessed, efforts to improve survival should focus on prompt delivery of interventions of known effectiveness by those who witness the event.

Developing Quality Indicators for the Appropriateness of Resuscitation in Prehospital Atraumatic Cardiac Arrest

OBJECTIVE

The vast majority of out-of-hospital cardiac arrest victims do not survive or suffer severe neurological impairment. We sought to develop a set of straightforward clinical indicators that paramedics could use to better match resuscitation attempts to those most likely to benefit.

METHODS

In partnership with the Los Angeles County Emergency Medical Services, we used the RAND/UCLA appropriateness method of quantifying expert opinion regarding the risks and benefits of medical procedures. We presented available scientific evidence related to potential indicators of the quality of resuscitative care to stakeholder-nominated experts. Forty-one candidate indicators incorporated key variables, including initial rhythm, patient preferences, presence of witnesses, and place of arrest. Nine panelists, including palliative care and emergency medical specialists, rated the appropriateness of paramedic use of each indicator by using a 1-9 scale. An indicator was considered appropriate if the potential benefits outweighed the potential harm to the patient or their family. Indicators were retained if median score was >/=7.

RESULTS

The expert panel voted to retain 28 quality indicators. Three addressed signs of irreversible death (e.g., dependent lividity), 8 addressed patient preferences (e.g., inquiring about DNR status), and the remainder addressed combinations of initial rhythm and other prognostic signs (e.g., "If initial rhythm is asystole and patient is known by apparent surrogate decision maker to have a terminal illness, then forgo resuscitation."). Our experts recommended a series of much more liberal criteria for forgoing resuscitation than is currently practiced. This includes ascertaining and honoring patient preferences, either through written documents or family members, and combinations of clinical criteria that predict poor neurological outcome, such as asystole, terminal illness, age greater than 70, and response time greater than 15 minutes.

CONCLUSIONS

These quality indicators expand on the previously limited circumstances in which paramedics might forgo field resuscitation and implementation could reduce future harm from such procedures among seriously ill patients. Our current efforts focus on using these indicators to aid implementation of a new resuscitation policy for seriously ill patients in our county.

Validation of 3 termination of resuscitation criteria for good neurologic survival after out-of-hospital cardiac arrest

STUDY OBJECTIVE

Several termination of resuscitation criteria have been proposed to identify patients who will not survive to hospital discharge after out-of-hospital cardiac arrest. However, only 1 set has been derived to specifically predict survival to hospital discharge with good neurologic function. The objectives of this study were to externally validate the basic life support (BLS) termination of resuscitation, advanced life support (ALS) termination of resuscitation, and neurologic termination of resuscitation criteria and compare their abilities to predict survival to hospital discharge with good neurologic function after out-of-hospital cardiac arrest.

METHODS

This was a secondary analysis of the Denver Cardiac Arrest Registry. Consecutive adult nontraumatic cardiac arrest patients in Denver County from January 1, 2003, through December 31, 2004, were included in the study. The BLS termination of resuscitation, ALS termination of resuscitation, and neurologic termination of resuscitation criteria were applied to the cohort, and their predictive proportions and 95% confidence intervals (CIs) were calculated for each set of criteria.

RESULTS

Of the 715 patients included in this study, the median age was 65 years (interquartile range 52 to 78 years), and 69% were male patients. In addition, 223 (31%) had return of spontaneous circulation, 175 (24%) survived to hospital admission, 58 (8%) survived to hospital discharge, and 42 (6%) survived to hospital discharge with good neurologic function. The proportion of patients with good neurologic survival to hospital discharge correctly identified for continued resuscitation was 100% (95% CI 92% to 100%) for all 3 termination of resuscitation criteria. The proportion of patients with poor neurologic survival to hospital discharge or no survival to hospital discharge correctly identified as eligible for termination of resuscitation was 36% (95% CI 32% to 40%) with the BLS termination of resuscitation criteria, 25% (95% CI 22% to 29%) with the ALS termination of resuscitation criteria, and 6% (95% CI 4% to 8%) with the neurologic termination of resuscitation criteria. Use of the BLS termination of resuscitation criteria would have reduced transport of the largest number of patients.

CONCLUSION

All 3 termination of resuscitation criteria had equally high abilities to identify patients requiring continued resuscitation. The BLS termination of resuscitation criteria, however, had the best combined ability to predict good neurologic survival and poor neurologic survival or death. These findings and the relative simplicity of the BLS termination of resuscitation criteria support their use.

Independent evaluation of an out-of-hospital termination of resuscitation (TOR) clinical decision rule

OBJECTIVES

Recently, investigators described a clinical decision rule for termination of resuscitation (TOR) designed to help determine whether to terminate emergency medical services (EMS) resuscitative efforts for out-of-hospital cardiac arrests (OOHCA). The authors sought to evaluate the hypothesis that TOR would predict no survival for patients in an independent cohort of patients with OOHCA.

METHODS

This was a retrospective cohort analysis conducted in the state of Arizona. Consecutive, adult, OOHCA were prospectively evaluated from October 2004 through October 2006. A statewide OOHCA database utilizing Utstein-style reporting from 30 different EMS systems was used. Data were abstracted from EMS first care reports and hospital discharge records. The TOR guidelines predict that no survival to hospital discharge will occur if 1) an OOHCA victim does not have return of spontaneous circulation (ROSC), 2) no shocks are administered, and 3) the arrest is not witnessed by EMS personnel. Data were entered into a structured database. Continuous data are presented as means (+/-standard deviations [SD]) and categorical data as frequency of occurrence, and 95% confidence intervals (CIs) were calculated as appropriate. The primary outcome measure was to determine if any cohort member who met TOR criteria survived to hospital discharge.

RESULTS

There were 2,239 eligible patients; the study group included 2,180 (97.4%) patients for whom the data were complete; mean age was 64 (+/-11) years, and 35% were female. The majority of patients in the study group met at least one or more of the TOR criteria. A total of 2,047 (93.8%) patients suffered from cardiac arrest that was unwitnessed by EMS; 1,653 (75.8%) had an unwitnessed arrest and no ROSC. With respect to TOR, 1,160 of 2,180 (53.2%) patients met all three criteria; only one (0.09%; 95% CI = 0% to 0.5%) survived to hospital discharge.

CONCLUSIONS

The authors evaluated TOR guidelines in an independent, statewide OOHCA database. The results are consistent with the findings of the TOR investigation and suggest that this algorithm is a promising tool for TOR decision-making in the field.

Transfer of care is associated with longer unsuccessful resuscitations

OBJECTIVE

Accepted guidelines define when to terminate unsuccessful resuscitations. We examined whether such resuscitations last longer for transported arrests in the field compared with those occurring in the emergency department (ED).

METHODS

This was a retrospective study of patients who died in an urban, academic ED over 32 months starting from January 2001. Total length of resuscitation and the interval occurring in-ED were compared for arrests in the ED and transported arrests from the field.

RESULTS

A total of 132 patients met the criteria, of whom 71 (53.8%) arrested in the field. Mean overall resuscitation times were longer for arrests occurring in the field (44 minutes; 95% confidence interval [CI], 39-48) compared with those in the ED (19 minutes; 95% CI, 16-22; P < .001). Mean resuscitation intervals occurring in the ED were no different for arrests occurring in the field (16 minutes; 95% CI, 13-19) than in the ED (19 minutes; 95% CI, 16-22; P > .05).

CONCLUSIONS

Unsuccessful resuscitations were longer and beyond guideline recommendations when arrests occurred in the field and were transported. The interval of resuscitation that occurred in the ED was the same whether or not prehospital resuscitation occurred.

Derivation and evaluation of a termination of resuscitation clinical prediction rule for advanced life support providers

OBJECTIVES

The primary aim was to derive a new termination of resuscitation (TOR) clinical prediction rule for advanced life support paramedics (ALS) and to measure both its pronouncement rate and diagnostic test characteristics. Secondary aims included measuring the test characteristics of a previously derived and published basic life support termination of resuscitation (BLS TOR) clinical prediction rule [Morrison LJ, Visentin LM, Kiss A, et al. Validation of a rule for termination of resuscitation in out-of-hospital cardiac arrest. N Engl J Med 2006;355(5):478-87] on the same cohort of patients for comparison purposes.

METHODS

Secondary data analysis of adult cardiac arrests treated by ALS in rural and urban EMS systems participating in the OPALS study (data extracted from Phase III). A previous study for a basic life support termination of resuscitation (BLS TOR) clinical prediction rule proposed Termination of Resuscitation if the patient had no return of spontaneous circulation (ROSC) before transport; no shock administered; EMS personnel did not witness the arrest [Morrison LJ, Visentin LM, Kiss A, et al. Validation of a rule for termination of resuscitation in out-of-hospital cardiac arrest. N Engl J Med 2006;355(5):478-87]. Multivariable logistic regression was used to examine the relationship between these variables, additional Utstein variables, and the primary outcome of survival to hospital discharge. Diagnostic test characteristics were measured for both the ALS TOR and BLS TOR models on this derivation cohort.

RESULTS

Four thousand six hundred and seventy-three cardiac arrest patients were included; 3098 (66%) were male, mean (S.D.) age 69 (15); 239 (5.1%; 95% CI 4.5-5.8) survived to hospital discharge; 3841 patients had no ROSC (82%) and of these only three survived (0.08%; 95% CI 0.02, 0.23). The final ALS TOR model associated with survival, included: ROSC (OR 260.9; 95% CI 96.3, 706.7), bystander witnessed (OR 2.0; 95% CI 1.3, 3.1), bystander CPR (OR 2.8; 95% CI 1.9, 4.1), EMS witnessed (OR 12.3; 95% CI 7.1, 21.3) and shock prior to transport (OR 6.4; 95% CI 4.1, 10.1). A new ALS TOR clinical prediction rule based on these variables was 100% sensitive (95% CI 99.9-100) for survival and had 100% negative predictive value (95% CI 99.9-100) for death. Under the ALS TOR clinical prediction rule, 30% of patients would be pronounced in the field. The BLS TOR clinical prediction rule, was 100% sensitive (95% CI 99.9, 100), had 100% negative predictive value (95% CI 99.9-100) and the field pronouncement rate was 48%.

CONCLUSION

Cardiac arrest patients may be considered for prehospital ALS TOR when there is no ROSC prior to transport, no shock delivered, no bystander CPR and the arrest was not witnessed by bystanders or EMS. A single EMS termination clinical prediction rule for all levels of providers would be optimal for EMS systems to implement. Prospective evaluation of the ALS TOR clinical prediction rule in the hands of ALS providers will be required before implementation.

Inter-rater reliability and comfort in the application of a basic life support termination of resuscitation clinical prediction rule for out of hospital cardiac arrest

STUDY OBJECTIVE

This study evaluates inter-rater reliability and comfort of BLS providers with the application of an out-of-hospital Basic Life Support Termination of Resuscitation (BLS TOR) clinical prediction rule. This rule suggests that continued BLS cardiac resuscitation is futile and can be terminated in the field if the following three conditions are met: (1) no return of spontaneous circulation; (2) no shock given prior to transport; (3) cardiac arrest not witnessed by EMS personnel.

METHODS

Providers hypothetically applied the rule and rated their comfort level on a five-point Likert-type scale, from "very comfortable" to "very uncomfortable" during the prospective validation of a BLS TOR clinical prediction rule in out-of-hospital cardiac arrest conducted in 12 rural and urban communities [Morrison LJ, Visentin LM, Kiss A, et al. Validation of a rule for termination of resuscitation in out-of-hospital cardiac arrest. New Engl J Med 2006;355(5):478-87]. A Kappa score measured agreement between providers and compared to the correct interpretation of the rule.

RESULTS

We compared mean comfort levels of providers who interpreted the rule correctly versus incorrectly. Of 1240 enrolled cases, 1184 (95.5%) had paramedic attendant forms and 1211 (97.7%) had driver forms and 1175 (94.7%) had both. Kappa for interpretation agreement between driver and attendant was 0.90 (95% CI, 0.87-0.92); between attendant and correct interpretation of the BLS TOR clinical prediction rule, 0.88 (95% CI, 0.85-0.91); between driver and correct interpretation of the BLS TOR clinical prediction rule, 0.88 (95% CI, 0.85-0.91). For instances in which both providers applied the rule correctly (607/635 [95.6%]), the providers were significantly more comfortable (chi(2)(4)=30.5, p<0.0001) than those instances in which they did not (28/635 [4.4%].

CONCLUSIONS

The vast majority of providers were able to apply the BLS TOR clinical prediction rule correctly and were comfortable doing so. This suggests that both reliability and comfort will remain high during routine application of the rule when paramedics are well trained as users of the rule.

Validation of a rule for termination of resuscitation in out-of-hospital cardiac arrest

BACKGROUND

We prospectively evaluated a clinical prediction rule to be used by emergency medical technicians (EMTs) trained in the use of an automated external defibrillator for the termination of basic life support resuscitative efforts during out-of-hospital cardiac arrest. The rule recommends termination when there is no return of spontaneous circulation, no shocks are administered, and the arrest is not witnessed by emergency medical-services personnel. Otherwise, the rule recommends transportation to the hospital, in accordance with routine practice.

METHODS

The study included 24 emergency medical systems in Ontario, Canada. All patients 18 years of age or older who had an arrest of presumed cardiac cause and who were treated by EMTs trained in the use of an automated external defibrillator were included. The patients were treated according to standard guidelines. Characteristics of diagnostic tests for the prediction rule were calculated. These characteristics include sensitivity, specificity, and positive and negative predictive values.

RESULTS

Follow-up data were obtained for all 1240 patients. Of 776 patients with cardiac arrest for whom the rule recommended termination, 4 survived (0.5 percent). The rule had a specificity of 90.2 percent for recommending transport of survivors to the emergency department and had a positive predictive value for death of 99.5 percent when termination was recommended. Implementation of this rule would result in a decrease in the rate of transportation from 100 percent of patients to 37.4 percent. The addition of other criteria (a response interval greater than eight minutes or a cardiac arrest not witnessed by a bystander) would further improve both the specificity and positive predictive value of the rule but would result in the transportation of a larger proportion of patients.

CONCLUSIONS

The use of a clinical prediction rule for the termination of resuscitation may help clinicians decide whether to terminate basic life support resuscitative efforts in patients having an out-of-hospital cardiac arrest.

Resuscitation attempts in asystolic patients: The legal tail wagging the dog?

In today's litigious society, legal worries can cause Emergency practitioners to alter their delivery of clinical care. One clinical scenario in which this particularly true is in resuscitation of the so called "medically futile" patient. Patients who arrive to the Emergency Department in prolonged asystole have a uniformly dismal prognosis at best. Yet, many Emergency Physicians often continue resuscitative efforts for fear of being sued. These fears are largely unjustified. This article attempts to analyze the factors and elements involved in support of the assertion that the risk of a lawsuit is negligible at best.

Can we define patients with no chance of survival after out-of-hospital cardiac arrest?

OBJECTIVE

To evaluate whether subgroups of patients with no chance of survival can be defined among patients with out-of-hospital cardiac arrest.

PATIENTS

Patients in the Swedish cardiac arrest registry who fulfilled the following criteria were surveyed: cardiopulmonary resuscitation (CPR) was attempted; the arrest was not crew witnessed; and patients were found in a non-shockable rhythm.

SETTING

Various ambulance organisations in Sweden.

DESIGN

Prospective observational study.

RESULTS

Among the 16,712 patients who fulfilled the inclusion criteria, the following factors were independently associated with a lower chance of survival one month after cardiac arrest: no bystander CPR; non-witnessed cardiac arrest; cardiac arrest occurring at home; increasing interval between call for and arrival of the ambulance; and increasing age. When these factors were considered simultaneously two groups with no survivors were defined. In both groups patients were found in a non-shockable rhythm, no bystander CPR was attempted, the arrest was non-witnessed, the arrest took place at home. In one group the interval between call for and arrival of ambulance exceeded 12 minutes. In the other group patients were older than 80 years and the interval between call for and arrival of the ambulance exceeded eight minutes.

CONCLUSION

Among patients who had an out-of-hospital cardiac arrest and were found in a non-shockable rhythm the following factors were associated with a low chance of survival: no bystander CPR, non-witnessed cardiac arrest, the arrest took place at home, increasing interval between call for and arrival of ambulance, and increasing age. When these factors were considered simultaneously, groups with no survivors could be defined. In such groups the ambulance crew may refrain from starting CPR.

Analysis of clinical outcomes following in-hospital adult cardiac arrest

AIMS

The outcome of in-hospital resuscitation following cardiac arrest depends on many factors related to the patient, the environment and the extent of resuscitation efforts. The aim of the present study was to determine predictors of successful resuscitation and survival to -hospital discharge following in-hospital cardiac arrest and to assess functional outcomes of survivors (cerebral performance scores).

METHODS

Medical records of adult patients sustaining in-hospital cardiac arrest between June 2001 and January 2003 were reviewed. Successful resuscitation was defined as the return of spontaneous circulation at the completion of resuscitative efforts, irrespective of degree of inotropic/vasopressor support. Thirty demographic and clinical variables were analysed to determine predictors of successful resuscitation and in-hospital survival.

RESULTS

In 105 patients with cardiac arrest, 46 patients (44%) were successfully resuscitated and 22 (21%) survived to hospital discharge. Predictors of successful resuscitation included a primary cardiac admission diagnosis, monitoring at the time of the arrest, a longer duration of resuscitation and the absence of the need for endotracheal intubation. Patients with ventricular tachycardia/fibrillation were more likely to survive to hospital discharge than those with asystolic or pulseless electrical activity (45 vs 12 vs 20%, P = 0.01). The sole independent predictor of survival to hospital discharge was the absence of the need for endotracheal intubation (odds ratio 0.14, 95% confidence interval 0.02-0.88, P < 0.01). The majority of survivors (73%) had normal cerebral performance scores.

CONCLUSIONS

Identification of predictors of successful resuscitation following cardiac arrest is important for risk stratification. Ongoing appraisal of in-hospital cardiac arrests through a multicentre registry could improve clinical outcomes.

The perspective of paramedics about on-scene termination of resuscitation efforts for pediatric patients

OBJECTIVES

The purpose of this study was to assess the attitude of paramedics to on-scene termination of cardiopulmonary resuscitation (T-CPR) efforts in children prior to developing a pediatric T-CPR policy.

METHODS

A 26-item anonymous survey was conducted of all of the active paramedics in a large urban EMS system where T-CPR had been practiced routinely for adults. Questions addressed paramedic demographics, training level, experience with adult and pediatric advanced cardiac life support (ACLS), experience with T-CPR in adults, T-CPR case scenarios, and T-CPR in children.

RESULTS

All 201 paramedics in the system (mean age=34.2 years; mean years as paramedic = 8.5 ) completed all relevant items of the survey (100% compliance). Two-thirds had provided ACLS for cardiac arrest to >50 adults (93% >10 adults) and more than one-third had performed ACLS on >20 children (72% >5 children). In addition, 90% had participated in T-CPR for adults. The majority of paramedics reported at least occasional (pre-defined) difficulty with adult T-CPR including family confrontation, 43%; personal discomfort, 13%; disagreement with physician decision to continue efforts, 11%; and fear of liability, 10%. Paramedic self ratings of comfort with terminating CPR on a scale from 1 to 10 (1: very comfortable; 10: uncomfortable) for adults and children were 1 and 9, respectively (P<0.001). In addition, the clear majority (72%) responded that children deserve more aggressive resuscitative efforts than adults.

CONCLUSIONS

Paramedics feel relatively uncomfortable with the concept of terminating resuscitation efforts in children in the pre-hospital setting.

Prehospital cardiac arrest outcome is adversely associated with antiarrythmic agent use, but not associated with presenting complaint or medical history

STUDY OBJECTIVE

This study associated survival from prehospital cardiac arrest to patient historical variables including presenting complaint, medications used, and medical history as a secondary end point in a trial evaluating the effect of bicarbonate administration. This raises issues concerning extensive prehospital historical assessment that may potentially delay care and transport.

METHODS

This prospective multicentre trial enrolled 874 prehospital cardiac arrest patients encountered by urban, suburban, and rural emergency medical services. This group underwent conventional ACLS intervention followed by empiric early administration of sodium bicarbonate (1mEq/l). Survival was measured as the presence of vital signs on emergency department arrival. Data analysis used Student's t test, Fisher's exact test, chi2 with Pearson correlation, and logistic regression (p<0.05). Secondary end points were analysed including an association with common historical variables such as medical history, presenting complaint, or drugs used.

RESULTS

The overall survival rate was 13.9% (110 of 793) of prehospital arrest patients. There was no correlation between historical factors, such as chief complaint or history of present illness (p = 0.277), medical history (p = 0.425), presence of specific disease conditions (p = 0.1125-0.956), or overall drug use (p = 0.002-0.9848). However, there was an adverse association between specific antiarrhythmic use (p = 0.003) and outcome.

CONCLUSION

There is little relation of patient historical factors on the outcome from prehospital cardiac arrest raising issues of efficiency with history taking in prehospital care and transport.

Prehospital ACLS--does it work?

Cardiac disease is the most common cause of death in the United States, and sudden cardiac arrest frequently claims the lives of men and women during their most productive years. It is believed that much better survival rates can be achieved for victims of cardiac arrest through optimizing the "chain of survival" as described by the American Heart Association. The relative and incremental benefit of full prehospital ACLS over basic life support and defibrillation is unproven, however. This is an important issue in this era of cost containment. Some of the ongoing studies including the OPALS study may clarify the cost effectiveness and relative efficacy of rapid defibrillation and full ACLS programs for victims of prehospital cardiac arrest [6].

Termination of resuscitation: the art of clinical decision making

Despite all of the progress in reanimating patients in cardiac arrest over the last half century, resuscitation attempts usually fail to restore spontaneous circulation. Thus, the most common of all resuscitation decisions after initiation remains the decision to stop. An entire library of research and guidelines for terminating resuscitative efforts has been developed in the past decade. However, this most central decision is often left open to chance, provider preference, family wishes, futility judgments, and resource concerns-a host of subjective considerations at the bedside and beyond. This article sheds light on these considerations, acknowledging the pivotal role that resuscitation science and guidelines can play in the multifactorial decision to discontinue resuscitative efforts.

Avoiding the futility of resuscitation

PURPOSE

To identify patients who should not have resuscitation started or continued.

DESIGN

Multi-disciplinary prospective study.

SUBJECTS

Two hundred forty-one consecutive patients with cardiopulmonary arrests from January 1995 to February 1997 were evaluated, of which 200 were studied.

METHODS

Subjects were studied for age, sex, arrest location, CPR duration, recovery from arrest, hospital discharge, 6 weeks' survival, sepsis and co-morbid conditions.

RESULTS

Overall 69 (34.5%) recovered from the arrest, 24 (12.0%) left the hospital, and 17 (8.5%) survived 6 weeks. Of inpatients, 13.7% (16/117) were alive at 6 weeks in contrast to 1.2% (1/83) of field/emergency room (ER) arrests. Sepsis did not lessen the immediate recovery rate; however, none of 25 septic patients survived hospitalization. Outcomes were not different between men and women or regular floor and ICU/CCU arrests. Age of survivors was the same as non-survivors. Survivors were resuscitated for 18.7+/-16.5 min and non-survivors 33.1+/-18.4 min (P=0.15). The initial rhythm of asystole or the presence of three or more co-morbid conditions had a negative prognosis.

CONCLUSION

CPR survival is problematic, and it is especially poor in field/BR arrests. Emergency squads should terminate CPR for pulseless patients after communicating with the ER physician. Age is not a determinant of recovery or survival. Arrest outside of the hospital, sepsis, three or more co-morbid conditions, previous CPR, asystole or resuscitation for >25 min all decrease the chance of hospital discharge and survival. Instituting or continuing CPR in a great majority of these patients is futile. Families should be so advised.

Resuscitation research: future directions and ethical issues

Cardiopulmonary resuscitation research is a vital area of research that has made significant contributions to medical care over the last several decades. Abundant information currently exists in the medical literature, as a result of research in the areas of cardiac arrest and outcomes, physiology of cardiac arrest, pharmacologic treatments, mechanical interventions, and societal and ethical issues. Despite numerous clinical trials demonstrating physiologic benefit of various interventions, few interventions have had as much impact on outcomes of cardiac arrest as have improvements in out-of-hospital response times and rapid availability of medical treatment. Although abundant information exists regarding physiologic aspects of resuscitation, relatively little information exists about ethical, psychological, and social aspects of resuscitation. In addition to attempts to improve outcomes of cardiac arrest, researchers should also strive to improve the experiences of patients and families involved. These realities provide future strategies and directions for the best use of resuscitation research resources; although physiologic and pharmacologic research will always have significant roles in the improvement of medical care, the rapid delivery of out-of-hospital care and ethical issues will be indispensable areas of research focus in the future.

Decision making by emergency physicians when assessing cardiac arrest patients on arrival at hospital

OBJECTIVE

To investigate the factors which influence decision making by experienced emergency physicians when they decide whether to (a) pronounce 'life extinct' in adult patients with non traumatic cardiac arrest while in the ambulance, or (b) bring them into the resuscitation room in the Emergency Department for further assessment/management.

DESIGN

Qualitative study involving semi structured interviews and a focus group.

SETTING

Accident & Emergency (A&E) departments in the Yorkshire region.

PARTICIPANTS

Fifteen emergency physicians (two clinical fellows, nine specialist registrars and four consultants) working in the Yorkshire region.

RESULTS

Six main themes were identified that impacted upon the decision making process: the doctor's past experience, ambulance service issues, prehospital care, patient characteristics, presence and views of relatives, and organisational issues.

CONCLUSION

The reasoning behind decisions made when a patient arrives at the Emergency Department in cardiac arrest is multifactorial. Strict guidelines would be difficult to construct since individuals vary in the importance they attach to different factors.

The death watch: certifying death using cardiac criteria

In the past, inadequate diagnostic instruments sometimes led to incorrect diagnoses of death, so careful and prolonged observation--the "death watch"--was required. Diagnostic instruments are now accurate and determining the presence or absence of circulation and cerebral function is easy in virtually all cases. Still, ambiguity and controversy in diagnosing death persists because the current criteria, irreversible cessation of cardiac or whole brain function, are ambiguous. Recent reintroduction of non-heart-beating organ donation has highlighted the controversy. Data on the ability to achieve restoration of spontaneous circulation are quite consistent, but they support several different sets of reasonable death criteria. This article concludes with a rejection of a fixed notion of "irreversibility" because it does not conform to current practice, is potentially deleterious to social events at the time of death, and the reversibility of cardiopulmonary arrest is dependent on available means of resuscitation. Finally, the time required to ensure irreversible cessation of cardiac function despite potential intervention is too broad to be clinically applicable and is unreasonable. Diagnosis of death should be based on the context in which it occurs because the medical means available determine what is irreversible.

Impact of ethics consultations in the intensive care setting: a randomized, controlled trial

OBJECTIVE

To determine the following: a) whether ethics consultations in the intensive care setting reduce nonbeneficial treatments, defined as days in the intensive care unit (ICU) and treatments delivered to those patients who ultimately fail to survive to hospital discharge; and b) whether physicians, nurses, social workers, and patients/families agree that ethics consultations in the ICU are beneficial in addressing treatment conflicts.

DESIGN

Prospective, randomized, controlled trial of ethics consultations.

SETTING

Medical and pediatric ICUs in a university medical center.

PATIENTS

Seventy-four patients in whom value-based treatment conflicts arose during the course of treatment.

INTERVENTIONS

The patients were randomly assigned to an intervention (ethics consultation offered) or nonintervention (ethics consultation not offered) arm of the trial.

MEASUREMENTS

Medical data and ICU hospital days were compared between the intervention and control groups before and after the randomization. Likert scale and commentary responses were recorded to structured and open-ended interviews with the responsible physicians, nurses, social workers, and families of patients assigned to the intervention arm within 1 month after the patient's death or hospital discharge. Interviewees were asked whether ethics consultations helped with the following: a) to identify ethical issues; b) to analyze ethical issues; c) to resolve ethical issues; d) to educate about ethical issues; and e) to present personal views.

MAIN RESULTS

There were no differences in overall mortality between the control patients and patients receiving ethics consultations. However, ethics consultations were associated with reductions in ICU hospital days and life-sustaining treatments in those patients who ultimately failed to survive to discharge. Also, ethics consultations were regarded favorably by most participants.

CONCLUSIONS

Ethics consultations seem to be useful in resolving conflicts that may be inappropriately prolonging futile or unwanted treatments and are perceived to be beneficial.

The most important changes in the international ECC and CPR guidelines 2000

Many people involved with resuscitation have specific interests and enthusiasm. They will review the new guidelines to see how their favorite interventions fared. This essay lists a number of the new guidelines that merit special attention: support for family presence at resuscitations, pronouncing death at the scene rather than after futile transport efforts, honoring advance directives, comparable effectiveness of bag-mask ventilation versus tracheal intubation, revision of compression rates and compression-ventilation ratios, and devices to confirm tracheal intubation and prevent tube dislodgment. Even more important are the new principles and concepts that the International Guidelines 2000 endorse: international guideline science, international guideline development, evidence-based guidelines, training by objectives, expanded scope of ECC to first aid and periarrest conditions, avoidance of false-negative (type II) errors, video-mediated instruction, and a philosophy to 'do no harm.' The number and magnitude of these new guidelines reflect the dynamic nature of resuscitation at the start of the 21st century. There is great optimism that these new and revised guidelines will help achieve our ultimate objective. This objective is to be ready when fate brings some lives to a premature end. If we are, we can restore more of these people to a high-quality life, ready for many more years of living.

Ethical issues of resuscitation

There is a wide variety of ethical issues and dilemmas involving resuscitation, the act of restoring life to a patient in cardiorespiratory arrest. Decisions must be made rapidly and often must be based on suboptimal levels of information available at the time. Certain issues should be considered when one is making decisions in the resuscitation arena, including positive-aspects of resuscitation, not only the possibility of restoring life to the patient but also providing a sense of closure and resolution of guilt for the survivors. During and following resuscitative efforts, the psychologic and emotional well-being of the survivors should also be given close attention.

An evidence-based evaluation of EMS protocols

OBJECTIVE

To determine the extent to which prehospital patient care protocols incorporate the findings of the peer-reviewed scientific EMS literature.

METHODS

Using a computerized literature search, articles published from eight institutions known to be active in prehospital care research were identified and obtained from the local health sciences library. Animal or bench research, analysis of administrative practices, evaluation of educational or quality assurance techniques, collective reviews, and air medical articles were excluded. We compared the findings of each article with the guidelines contained in 12 sets of prehospital care protocols, ranking them as: 1) consistent; 2) partially consistent; 3) not discussed; or 4) not consistent. The rankings for the article-protocol comparisons for each EMS system were compared using the Kruskal-Wallis test.

RESULTS

Forty-nine papers were compared with 12 sets of protocols, resulting in 588 comparisons. More than half (53.1%, n = 312) of the comparisons were ranked as "consistent." Only 28 (4.8%) of the comparisons were found to be "not consistent." There was no significant difference in the rankings assigned to the comparisons for protocols from each individual system, nor in the rankings for protocols from the EMS system associated with the source of the article, from other systems with academic affiliations, and from systems without academic affiliations.

CONCLUSION

Most EMS protocols are consistent with the published peer-reviewed research. There is no difference in the level of consistency when comparing protocols from EMS systems associated with the source of the articles, those associated with other academic institutions, and those without strong academic affiliations.

The Ontario Prehospital Advanced Life Support (OPALS) Study: rationale and methodology for cardiac arrest patients

The Ontario Prehospital Advanced Life Support Study represents the largest prehospital study yet conducted, worldwide. This study will involve more than 25,000 cardiac arrest, trauma, and critically ill patients over an 8-year period. The study will evaluate the incremental benefit of rapid defibrillation and prehospital Advanced Cardiac Life Support measures for cardiac arrest survival and the benefit of Advanced Life Support for patients with traumatic injuries and other critically ill prehospital patients. This article describes the OPALS study with regard to the rationale and methodology for cardiac arrest patients.

Factors influencing hospital transport of patients in continuing cardiac arrest

STUDY OBJECTIVE

Prior research has established the futility of continued resuscitation efforts for patients in cardiac arrest who fail to respond to out-of-hospital advanced cardiac life support. Determination of both medical and nonmedical factors resulting in the transport of patients in continuing cardiac arrest to the hospital may encourage the development of new systems or strategies to increase the appropriateness of these transports.

METHODS

The attending paramedic completed a prospective survey after unsuccessful resuscitation efforts in our urban, hospital-based, two-tier emergency medical services (EMS) system. All nontraumatic adult arrests were included unless they were clearly noncardiac in nature.

RESULTS

Paramedics responded to 259 cardiac arrests between September 12, 1996, and April 31, 1997. Seventy-nine patients were pronounced dead without resuscitation efforts. Of the remaining 180 patients, 44 had return of spontaneous circulation and were transported to the hospital, 68 were pronounced dead in the field, and 68 were transported to the hospital in continuing cardiac arrest. The 68 patients transported while in cardiac arrest are the focus of this study. Rare problems with field termination were identified. Reasons for transport of the 68 patients in continuing cardiac arrest included arrest in ambulance or going to ambulance (n = 6), arrest in a public place (n = 17), environmental factors (n = 6), road hazard to paramedics (n = 1), possible reversible cause (n = 4), persistent ventricular dysrhythmia (n = 5), no intravenous access (n = 5), airway difficulties (n = 5), family unable to accept field termination (n = 3), cultural or language barrier (n = 1), EMS physician ordered transport (n = 1), and obesity (n = 1). A protocol allowing pronouncement of death in the ambulance and transport of the body to a designated area could have prevented lights-and-siren transport to the emergency department in 24 of the 68 cases.

CONCLUSION

Factors other than medical ones often influence the decision to transport patients in continuing cardiac arrest. In our urban system, physician, medical examiner, and paramedic education and protocols were needed to aid decision-making in this situation.

Implementation of an out-of-hospital termination of resuscitation policy

OBJECTIVE

To evaluate the implementation of an out-of-hospital termination of resuscitation policy in an urban EMS setting.

METHODS

A descriptive study characterizing the implementation of an out-of-hospital termination of resuscitation policy in the Chicago EMS system. It includes a retrospective telemetry record review analyzing the utilization and compliance with the policy. The newly implemented policy involved field termination of resuscitation for all nontraumatic, adult cardiac arrest victims presenting in asystole who were not responsive to a standard trial of resuscitation.

RESULTS

Over the three-month study period, 228 resuscitations of adult, nontraumatic cardiac arrest victims were identified and submitted for review. The group of 142 cardiac arrest victims who presented in asystole and received resuscitative efforts were categorized into four groups. Group I included 34 cardiac arrests for which resuscitation was terminated in the field following policy criteria. Group II included eight cardiac arrests for which resuscitation was terminated but the patients did not meet criteria for termination of resuscitation. Group III included 84 cardiac arrests for which resuscitation was not terminated because the patients did not meet criteria for out-of-hospital termination. Group IV included 16 cardiac arrests for which resuscitative efforts were continued, although the patients met indications for field termination.

CONCLUSIONS

Field termination of resuscitation is practical in the setting of asystole unresponsive to aggressive resuscitative efforts. The implementation of such an out-of-hospital termination of resuscitation policy is complicated by many problems and is best accomplished by a gradual implementation process. Through this process all members of the EMS community can address practical and ethical issues and grow comfortable with the ongoing evolution of out-of-hospital therapy.

Ethical issues of cardiopulmonary resuscitation: current practice among emergency physicians

OBJECTIVE

To determine current practice and attitudes among emergency physicians (EPs) regarding the initiation and termination of CPR.

METHODS

An anonymous survey was mailed to randomly selected EPs. Main outcome measures included respondents' answers to questions regarding outcome of resuscitation, and current practice regarding initiation, continuation, and termination of resuscitation for victims of cardiopulmonary arrest.

RESULTS

The 1,252 respondents were from all 50 states, a variety of practice settings, and varying board certification. Most (78%) respondents honor legal advance directives regarding resuscitation. Few (7%) follow unofficial documents, or verbal reports of advance directives (6%). Many (62%) make decisions regarding resuscitation because of fear of litigation or criticism. A majority (55%) have recently attempted numerous resuscitations despite expectations that such efforts would be futile. Most respondents indicated that ideally, legal concerns should not influence physician practice regarding resuscitation (78%), but that in the current environment, legal concerns do influence practice (94%).

CONCLUSIONS

Most EPs attempt to resuscitate patients in cardiopulmonary arrest, regardless of futility, except in cases where a legal advance directive is available. Many EPs' decisions regarding resuscitation are based on concerns of litigation and criticism, rather than their professional judgment of medical benefit or futility. Compliance with patients' wishes regarding resuscitation is low unless a legal advance directive is present. Possible solutions to these problems may include standardized guidelines for the initiation and termination of CPR, tort reform, and additional public education regarding resuscitation and advance directives.

Termination of nontraumatic cardiac arrest resuscitative efforts in the field: a national survey

OBJECTIVES

1) To describe elements of adult nontraumatic cardiac arrest protocols in those U.S. cities in which resuscitative efforts are being terminated in the out-of-hospital setting. 2) To determine the prevalence and methods of on-scene family grief counseling delivered in this setting.

METHODS

Emergency medical services (EMS) systems in each of the 200 largest cities in the United States were surveyed by telephone regarding the content of their adult cardiac arrest protocols. Type of arrest (medical vs trauma), final dysrhythmia, termination policies, and presence or absence of a grief counseling protocol were recorded.

RESULTS

All of the target population responded to the telephone survey. Most (135; 68%) EMS systems currently have written protocols that allow in-field termination of resuscitative efforts for adult nontraumatic cardiac arrest patients who remain asystolic. Only 47 (24%) EMS systems allow cessation of efforts for patients without return of spontaneous circulation regardless of the dysrhythmia. Base station contact is required for authorization to end resuscitative efforts in 120/135 (89%) EMS systems. Only 26/135 (19%) EMS systems that cease efforts in the field have written policies concerning on-scene family grief counseling. This counseling is most likely to be conducted by the out-of-hospital providers themselves.

CONCLUSION

Many U.S. urban EMS systems are terminating efforts for selected adult nontraumatic cardiac arrest patients, although few have written policies to address grief intervention for family members at the scene.

Continuation of CPR on admission to emergency department after out-of-hospital cardiac arrest. Occurrence, characteristics and outcome

AIM

To describe the occurrence, characteristics and outcome among patients with out-of-hospital cardiac arrest who required continuation of cardiopulmonary resuscitation (CPR) on admission to the emergency department.

PATIENTS

all patients in the municipality of Göteborg who suffered out-of-hospital cardiac arrest, were reached by the emergency medical service (EMS) system and in whom CPR was initiated. Period for inclusion in study: 1 Oct. 1980-31 Dec. 1992.

RESULTS

of 334 out-of-hospital cardiac arrests, 2,319 (68%) were receiving on-going CPR at the time of admission to hospital. Of these, 137 patients (6%) were hospitalized alive and 28 (1.2%) could be discharged from hospital. Of these patients, 39% had a cerebral performance categories (CPC) score of 1 (no cerebral deficiency), 18% had a CPC score of 2 (moderate cerebral deficiency), 36% had a CPC score of 3 (severe cerebral deficiency) and 7% had a CPC score of 4 (coma) at discharge. Among patients discharged. 76% were alive after 1 year.

CONCLUSION

among consecutive patients with out-of-hospital cardiac arrest, CPR was ongoing in 68% of them on admission to hospital. Among these patients, 6% were hospitalized alive and 1.2% were discharged from hospital. Thus, among patients with ongoing CPR on admission to hospital, survivors can be found but they are few in numbers and extensive cerebral damage is frequently present.

Firm myocardium in cardiopulmonary resuscitation

Firm myocardium in cardiopulmonary resuscitation (CPR) is a rarely described yet potentially important condition. To investigate the clinical nature and implications of firm myocardium in CPR, we retrospectively analyzed 59 adult patients with nontraumatic out-of-hospital cardiac arrest who underwent open-chest CPR in the emergency department and had heart consistency recorded. Consistency of the myocardium varied considerably between patients. Firm myocardium was noticed in 36 cases, mainly in the left ventricle (firm myocardium group). The remaining 23 hearts were not firm (soft myocardium group). Some hearts had an increase in their consistency during CPR. Patient characteristics were similar in the two groups. The firm myocardium group showed greater base deficit on arterial blood gas analysis, suggesting more severe ischemic injury. Very firm heart had a close association with an extremely low end-tidal CO2 tension. Histopathological examination revealed hypertrophy and fibrosis common to the two groups. Both groups received similar treatment except for a shorter duration of direct cardiac massage in the firm myocardium group, although a reasonably prolonged effort was made in most cases. The firm myocardium group responded poorly to treatment. Very firm myocardium never contracted, whereas less firm myocardium usually showed some, albeit insufficient, activity. Most cases in the soft myocardium group regained a pulse. Our results suggest that firm myocardium: (1) is common in patients who receive CPR in the emergency department, (2) indicates ischemic contracture, (3) is not uniform in firmness, reflecting the degree of ischemia and (4) is a grave prognostic factor in cardiac resuscitation.

Effectiveness of emergency medical services for victims of out-of-hospital cardiac arrest: a metaanalysis

STUDY OBJECTIVE

To determine the relative effectiveness of differences in response time interval, proportion of bystander CPR, and type and tier of emergency medical services (EMS) system on survival after out of hospital cardiac arrest.

METHODS

We performed a comprehensive literature search, excluding EMS systems other than those of interest (systems of interest were those comprising one tier with providers of basic life support [BLS] or advanced life support [ALS] and those comprising two tiers with providers of BLS or BLS-defibrillation followed by ALS), patient population of fewer than 100 cardiac arrests, studies in which we could not determine the total number of arrests of presumed cardiac origin, and studies lacking data on survival to hospital discharge. Metaanalysis using generalized linear model with dispersion estimation for random effects was then performed.

RESULTS

Increased survival to hospital discharge was significantly associated with tier (P < .01), response time interval (P < .01), and bystander CPR (P = .04). A significant interaction was detected between response time interval and bystander CPR (P = .02). For the studies analyzed, survival was 5.2% in a one-tier EMS system or 10.5% in a two-tier EMS system. A 1-minute decrease in mean response time interval was associated with absolute increases in survival rates of .4% and .7% in a one-tier and two-tier EMS systems, respectively.

CONCLUSION

Increased survival to hospital discharge may be associated with decreased response time interval and with the use of a two-tier EMS system as opposed to a one-tier system. The data available for this analysis were suboptimal. Policymakers need more methodologically rigorous research to have more reliable and valid estimates of the effectiveness of different EMS systems.

Family response to out-of-hospital death

OBJECTIVE

To better understand the perceptions, needs, and responses of family members after an out-of-hospital death.

METHODS

Over an 18-month period, phone interviews were conducted using a structured interview schedule modified from a similar study of survivors of in-hospital death. Subjects included 31 survivors of urban out-of-hospital deaths attended by paramedics from one ambulance company. Subjects were eligible if paramedics had arrived and death had been determined at the scene without transport. Survivors were interviewed 11 to 15 months after the death (mean = 12 months) to evaluate how well they coped with their loss, how they managed the experience of their loved ones' out-of-hospital deaths, and their feelings and beliefs about their loved ones' not being transported to a hospital.

RESULTS

None of the survivors believed their loved ones should have been transported to a hospital, and only one believed that something more could have been done for the individual. Although many of the survivors had suspected their loved ones had died, 64% had been informed of the death by emergency medical technicians (EMTs) or firefighters. Most thought the EMTs had informed them in a professional (81%) and gentle/supportive manner (74%). Some (29%) still had unanswered questions about the death, but most (58%) were adjusting well and no one had a "poor" adjustment.

CONCLUSION

In this small sample, survivors of out-of-hospital death were generally satisfied with the care their loved ones had received. None of the survivors believed their loved ones should have been transported to the hospital. They also believed the paramedics had been supportive and met their needs at the time of death. It appears that paramedics may be able to meet the needs of a patient's survivors by terminating out-of-hospital resuscitation efforts on the patient.

Use of end-tidal carbon dioxide to predict outcome in prehospital cardiac arrest

STUDY OBJECTIVE

End-tidal CO2 (ETCO2) measurement can be used to predict death in prehospital cardiac arrest patients with pulseless electrical activity (PEA).

DESIGN

A prospective, observational study.

SETTING

An urban and rural emergency medical services system in northwestern Washington state.

PARTICIPANTS

Ninety consecutive victims of prehospital cardiac arrest with PEA.

INTERVENTIONS

Patients were intubated in the field and treated using standard advanced cardiac life support protocols with online medical control. In addition, all patients were evaluated using mainstream ETCO2 monitoring. In this study, a hypothetical decision was made to cease resuscitative efforts based on an ETCO2 level of 10 mm Hg or less after 20 minutes of advanced cardiac life support.

RESULTS

The study included 90 patients (61 were men) with a mean age of 67.6 +/- 13.6 years (range, 27 to 95 years). The initial ETCO2 averaged 11.7 +/- 6.6 mm Hg in nonsurvivors (range, 5 to 50 mm Hg) and 10.9 +/- 4.9 mm Hg in survivors (range, 5 to 24 mm Hg) (P > .672 [NS]). After 20 minutes of advanced cardiac life support, ETCO2 averaged 3.9 +/- 2.8 mm Hg (range, 0 to 12 mm Hg) in patients in whom the theoretical decision was made to cease field resuscitation. In contrast, survivors' ETCO2, just before restoration of circulation, averaged 31 +/- 5.3 mm Hg (range, 16 to 35 mm Hg) (P < .0001). Using an ETCO2 of 10 mm Hg or less as a theoretical threshold to predict death in the field successfully discriminated between the 16 survivors to hospital admission (those that achieved return of spontaneous circulation) and 75 prehospital deaths. Of the 16 survivors to hospital admission, 9 died in the hospital, and 7 were discharged from the hospital alive. In 13 of the 16 survivors, the first evidence of return of spontaneous circulation, before a palpable pulse or blood pressure, was a rising ETCO2. The logistic-regression parameters for the model are 4.4391 + ETCO2*-0.3624 (P < .0001). Sensitivity was 97.3%; specificity 100%; positive predictive value 100%; and negative predictive value 88.9%.

CONCLUSION

This study suggests that a low ETCO2 (10 mm Hg or less) can be used to predict irreversible death in patients with pulseless electrical activity undergoing prehospital advanced cardiac life support. If future studies validate this model, use of ETCO2 may allow for triage decisions in the field.

Methodology-dependent variation in documentation of outcome predictors in out-of-hospital cardiac arrest

OBJECTIVE

To identify variation in outcome predictor documentation in out-of-hospital cardiac arrest associated with two different methods of data collection: concurrent questioning of personnel following a resuscitation attempt and archival report review.

METHODS

All patients > or = 18 years old who had out-of-hospital cardiac arrests, verified using the New York City 911 telephone system, between October 1, 1990, and April 1, 1991, were eligible for inclusion. The authors reviewed the first 200 cases of presumed primary cardiac arrest involving a resuscitation attempt among 3,243 consecutive ambulance call reports for cardiac arrest occurring during the study period. This archival data set was compared with data for the same 200 cases gathered through direct interview of field personnel by trained paramedics. The two data sets had been compiled independently by different individuals, using the same data collection instrument, which conformed to the Utstein template.

RESULTS

Comparison of the data obtained from ambulance records with the data obtained from interviews of prehospital personnel revealed several areas of variance. Of note was a significantly lower proportion of bystander-witnessed ventricular fibrillation (VF) in the data set gathered from written reports (7% vs 18%; 95% CI for the difference 4-18%; p = 0.001).

CONCLUSION

differences in methods of collection of out-of-hospital cardiac arrest data are associated with a more than twofold variation in the reported incidences of witnessed cardiac arrests manifesting as VF. Methodology-dependent variation in this important "denominator" may produce substantially different estimates of survival within the same cohort of patients.