A Decade of Progress in Regional ST-Segment Elevation Myocardial Infarction Systems of Care: A Tale of Two Cities.

Over the past 20 years, care for patients with ST-elevation myocardial infarction (STEMI) has rapidly evolved, not just in terms of how patients are treated, but where patients are treated. The advent of regional STEMI systems of care has decreased the number of "eligible but untreated" patients while improving access to primary percutaneous coronary intervention for patients. These regional STEMI systems of care have consistently demonstrated that rapid transport of STEMI patients is safe and effective, and have shown marked improvements in a variety of clinical outcomes. However, no two STEMI systems are alike, and each must be tailored to the unique geographic, political, and socioeconomic challenges of the region. This article takes an in-depth look at two of the earliest STEMI systems within the United States: the Minneapolis Heart Institute and the Los Angeles County STEMI receiving network.

Barriers to adoption of evidence-based prehospital airway management practices in California.

OBJECTIVE: To describe current prehospital airway management practices for adults and children and barriers to adoption of evidence-based airway management practices in California. METHODS: We surveyed local medical directors of California's 31 emergency medical services (EMS) agencies regarding prehospital airway management, including provider scope of practice, continuous quality improvement practices, and perceptions regarding barriers to the implementation of evidence-based airway management practices. The survey instrument was a Web-based, closed-response form ( www.surveymonkey.com ) that medical directors could access by an e-mailed link provided by investigators. Medical directors were contacted by phone, mail, and e-mail to request their participation in the Web-based survey. RESULTS: Twenty-five of 31 (81%) EMS medical directors completed the survey. Five medical directors completed surveys for two agencies over which they had responsibility. All responding medical directors employ bag-mask ventilation (BMV), airway adjuncts, and adult endotracheal intubation (ETI), which are procedures widely accepted in EMS practice. Rapid-sequence intubation (RSI), which has been shown to cause harm in certain patient subgroups, was not employed by any of the respondents. Prehospital pediatric ETI, which has been shown not to provide any benefit over BMV, was employed by 22 of 25 (88%) medical directors. Thirteen of 23 (57%) respondents identified "more evidence is needed" or "these results do not apply to my EMS system" as the top reasons to continue the practice of prehospital pediatric ETI. CONCLUSIONS: The results of our study suggest that in areas of EMS where robust evidence exists, medical directors (100%) will discontinue or not adopt skills that potentially harm patients, such as RSI, but are unlikely (12%) to discontinue procedures that show no benefit to patients (such as pediatric ETI). Barriers to adoption of evidence-based practice include difficulty in generalizing results of studies across diverse EMS systems and perceived lack of evidence that the procedure should be abandoned.

Potential impact of a verbal prehospital DNR policy.

BACKGROUND: Forgoing resuscitation in prehospital cardiac arrest has previously required a written prehospital do-not-resuscitate (DNR) order. Some emergency medical services (EMS) agencies, including Los Angeles County (LAC), have implemented policies allowing surrogate decision makers to verbally request to forgo resuscitation. The impact of a verbal DNR policy is unclear, given the absence of information about how often cardiac arrest occurs at home, or in the presence of a family member. OBJECTIVE: To determine the prevalence of written DNR forms, rate of resuscitation, location of cardiac arrest, and availability of a family member in nontraumatic cardiac arrest prior to implementation of the new policy in LAC. METHODS: All prehospital run sheets for nontraumatic cardiac arrest in LAC were reviewed for the first seven days of each month (August 2006-January 2007) for DNR status, location of cardiac arrest, presence of family members, and whether resuscitation was attempted. RESULTS: Of the 897 cardiac arrests, 492 occurred at home, 111 in a public place, and 93 in a nursing home (location was unknown for 201). Fifty-five patients (6%) had a written DNR order, although it was not always available. Of these 55 patients, ten were resuscitated, the majority of the time because the family could not produce the paperwork. A family member was listed as present 29% of the time (261 of 897 cases). A medical history was obtained in an additional 465 cases (52%), indicating that someone familiar with the patient's medical history was present more than half the time, even when a family member was not mentioned. CONCLUSIONS: A written DNR order is uncommonly used in the prehospital setting as a reason to forgo resuscitation in LAC. Even when family members state that the patient has a DNR order, patients are often resuscitated. A majority of cardiac arrests occurs at the patient's home, and in many cases in the presence of family members, some of whom may be able to express a patient's preferences regarding end-of-life care.

Five-Year Follow-up of a Severe Case of Pertussis in Oregon, 2012.

Oregon continues to face epidemics of pertussis, and infants younger than 2 months of age have the highest incidence and rates of hospitalization and complications. We describe the medical course and sequelae of an infant's severe pertussis illness through age 5½ years. The child has failed to meet developmental milestones, requires substantial medical care, and bears the burdens of chronic lung disease, stroke, epilepsy, impaired neurodevelopment, and problems with vision. The medical and social burden of pertussis among infants too young to be vaccinated underscores the importance of tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccination during pregnancy.

Rationale for establishing regional ST-elevation myocardial infarction receiving center (SRC) networks.

Recent developments have provided a unique opportunity for the organization of regional ST-elevation myocardial infarction (STEMI) receiving center (SRC) networks. Because cumulative evidence has demonstrated that rapid primary percutaneous coronary intervention (PCI) is the most effective reperfusion strategy for acute STEMI, the development of integrated SRC networks could extend the benefits of primary PCI to a much larger segment of the US population. Factors that favor the development of regional SRC networks include results from recently published clinical trials, insight into contemporary STEMI treatment patterns from observational registries, experience with the nation's current trauma system, and technological advances. In addition, the 2004 American College of Cardiology/American Heart Association STEMI guidelines have specified that optimal "first medical contact-to-balloon" times should be <90 minutes, so a clear benchmark for timely reperfusion has been established. Achievement of this benchmark will require improvements in the current process of care as well as increased multidisciplinary cooperation between emergency medical services, emergency medicine physicians, and cardiologists. Two types of regional SRC networks have already begun to evolve in role-model cities, including prehospital cardiac triage and interhospital transfer. Regional coordination of SRC networks is needed to ensure quality monitoring and to delineate the ideal reperfusion strategy for a given community based on available resources and expertise.

Effect of Therapeutic Hypothermia on Survival and Neurologic Outcome in the Elderly.

Old age is considered a negative prognostic factor after out-of-hospital cardiac arrest (OHCA). The purpose of this study was to assess the benefit of therapeutic hypothermia (TH) on survival and neurologic outcome in the elderly. This is a retrospective study of patients treated for OHCA from April 2011 to August 2013 in a regional cardiac system. Patients with return of spontaneous circulation (ROSC) are directed to designated cardiac receiving centers with established TH protocols. The decision to initiate TH is determined by the treating physician. All patients 65 years or older were identified. Patients were excluded if awake and responsive in the emergency department, died before hospital admission, or had preexisting coma. The adjusted odds ratio for survival with good neurologic outcome (defined as cerebral performance category [CPC] 1 or 2) was calculated for patients who received TH compared to a reference group without TH. There were 1612 patients, of whom 552 (34%) received TH. Median age was 78 (inter-quartile range [IQR] 71-85); 56% was male. 493 (31%) patients survived to hospital discharge, 266 (17%) with CPC of 1 or 2. Of 1292 patients considered for TH, 192 (25%) of 552 patients who received TH survived to hospital discharge and 97 (18%) with good neurologic outcome compared to 150 (20%) and 57 (8%), respectively, without TH. The adjusted odds ratio for survival with good neurologic outcome for TH was 2.0 (95% CI 1.3-3.3). TH is associated with improved neurologic outcome in the elderly population.

Suffer the Infants: A Severe Case of Pertussis in Oregon, 2012.

Pertussis remains a public health concern in Oregon, especially among young infants. The disease can be severe in this age group and is associated with a high inpatient cost. This report describes an Oregon infant who was hospitalized with pertussis for 90 days, required extracorporeal oxygenation for 43 days, suffered complications including stroke, and had hospital charges totaling $1.5 million. Pertussis morbidity among young infants argues for vaccination of women during each pregnancy and of infants beginning promptly at two months of age.

Translation of evidence-based clinical standards into a new prehospital resuscitation policy in Los Angeles County.

OBJECTIVE: To translate a set of evidence-based clinical standards designed to allow paramedics to forego unnecessary and potentially harmful resuscitation attempts into a feasible new policy. DATA SOURCES/SETTING: Policy documents, meeting minutes, and personal communications between a large urban Emergency Medical Services (EMS) agency serving all of Los Angeles County (LAC) and a research group were reviewed over 12 months. STUDY DESIGN: LAC EMS and University of California, Los Angeles (UCLA) formed a partnership (the EMS-UCLA Collaborative) to develop and translate the standards into new EMS protocols. Clinical indicators considered appropriate and feasible by an expert panel were submitted to the agency for inclusion in the new policy. FINDINGS: The Collaborative submitted the results to the LAC EMS Commission and a physician advisory group for review. Of the 41 indicators approved by the expert panel, 22 would have resulted in changes to the current policy. All six involved asking family members about or honoring written and verbal Do Not Attempt Resuscitate requests, but only 4 of the 16 indicators based on clinical characteristics were included in the new policy. Ultimately, 10 of the 22 indicators that would have changed policy were approved and implemented. CONCLUSIONS: By collaboration, a large EMS agency and a research team were able to develop and implement a revised resuscitation policy within 1 year.

"Call 911" STEMI protocol to reduce delays in transfer of patients from non primary percutaneous coronary intervention referral Centers.

Primary percutaneous coronary intervention (PPCI) is the preferred method of reperfusion for ST-segment elevation myocardial infarction (STEMI), if it can be performed in a timely manner by an experienced interventional cardiologist at a high volume STEMI Receiving Center. However, an estimated 50% of STEMI patients present to STEMI Referral Centers without PPCI capability. Transfer of STEMI patients for PPCI has been shown to improve outcomes as compared with fibrinolysis given at the presenting hospital. Nonetheless, transfer of STEMI patients for PPCI has not been used extensively in the United States and is associated with markedly prolonged transfer times. This study demonstrates that rapid transfer of STEMI patients from community hospitals without PPCI capability to a STEMI Receiving Center is both safe and feasible using a standardized protocol with an integrated transfer system.

The LA story: what happened after a new policy allowing paramedics to forgo resuscitation attempts in prehospital cardiac arrest.

BACKGROUND: Despite potential harm to patients, families, and emergency personnel, a low survival rate, and high costs and intensity of care, attempting resuscitation after prehospital cardiac arrest is the norm, unless there are signs of irreversible death or the presence of a valid, state-issued DNR. OBJECTIVE: To determine whether there was a change in the rate of forgoing resuscitation attempts in prehospital cardiac arrest after implementation of a new policy allowing paramedics to forgo resuscitation based on a verbal family request or the presence of certain arrest characteristics. METHODS AND RESULTS: All prehospital run sheets for cardiac arrest in Los Angeles County were reviewed for the first seven days of each month August 2006-January 2007 (pre-policy) and January-June 2008 (post-policy). Paramedics were more likely to forgo resuscitation attempts after the policy change (13.3% vs. 8.5%, p<0.01). In addition, the percentage of patients with documented signs of irreversible death decreased post-policy, from 50.4% to 35.8%, p<0.01. After adjustment for potential confounders (patient demographics, clinical characteristics and EMS factors), as well as exclusion of patients with signs of irreversible death, paramedics are significantly more likely to forgo a resuscitation, and less likely to attempt resuscitation, after the policy change (OR 1.67 [95% CI 1.07, 2.61], p=0.024). CONCLUSIONS: Paramedics are more likely to forgo, and less likely to attempt, resuscitation in victims of cardiac arrest after implementation of a new policy. There was also an associated decrease in the percentage of patients who had signs of irreversible death, which might reflect a change in paramedic behavior.

Paramedic and emergency medical technicians views on opportunities and challenges when forgoing and halting resuscitation in the field.

OBJECTIVES: The objective was to assess paramedic and emergency medical technicians (EMT) perspectives and decision-making after a policy change that allows forgoing or halting resuscitation in prehospital atraumatic cardiac arrest. METHODS: Five semistructured focus groups were conducted with 34 paramedics and 2 EMTs from emergency medical services (EMS) agencies within Los Angeles County (LAC), 6 months after a policy change that allowed paramedics to forgo or halt resuscitation in the field under certain circumstances. RESULTS: Participants had an overwhelmingly positive view of the policy; felt it empowered their decision-making abilities; and thought the benefits to patients, family, EMS, and the public outweighed the risks. Except under certain circumstances, such as when the body was in public view or when family members did not appear emotionally prepared to have the body left on scene, they felt the policy improved care. Assuming that certain patient characteristics were present, decisions by paramedics about implementing the policy in the field involve many factors, including knowledge and comfort with the new policy, family characteristics (e.g., agreement), and logistics regarding the place of arrest (e.g., size of space). Paramedic and EMT experiences with and attitudes toward forgoing resuscitation, as well as group dynamics among EMS leadership, providers, police, and ED staff, also play a role. CONCLUSIONS: Participants view the ability to forgo or halt resuscitation in the field as empowering and do not believe it presents harm to patients or families under most circumstances. Factors other than patient clinical characteristics, such as knowledge and attitudes toward the policy, family emotional preparedness, and location of arrest, affect whether paramedics will implement it.

Integration of pre-hospital electrocardiograms and ST-elevation myocardial infarction receiving center (SRC) networks: impact on Door-to-Balloon times across 10 independent regions.

OBJECTIVES: The aim of this study was to evaluate the rate of timely reperfusion for ST-elevation myocardial infarction (STEMI) with primary percutaneous coronary intervention (PPCI) in regional STEMI Receiving Center (SRC) networks. BACKGROUND: The American College of Cardiology Door-to-Balloon (D2B) Alliance target is a >75% rate of D2B

A Bayesian sensitivity analysis of out-of-hospital 12-lead electrocardiograms: implications for regionalization of cardiac care.

BACKGROUND: The effectiveness of out-of-hospital regionalization of ST-elevation myocardial infarction (STEMI) patients to hospitals providing primary percutaneous coronary intervention depends on the accuracy of the out-of-hospital 12-lead electrocardiogram (PHTL). Although estimates of sensitivity and specificity of PHTL for STEMI have been reported, the impact of out-of-hospital STEMI prevalence on positive predictive value (PPV) has not been evaluated. OBJECTIVES: To describe the relationship between varying population STEMI prevalences and PHTL predictive values, using ranges of PHTL sensitivity and specificity. METHODS: The authors performed a Bayesian analysis using PHTL, where values for sensitivities (60%-70%), specificities (98%), and two prevalence ranges (0.5%-5% and 5%-20%) were derived from a literature review. PPV prediction intervals were compared with three months of prospective data from the Los Angeles County Emergency Medical Services Agency STEMI regionalization program. RESULTS: When the estimated prevalence of STEMI in the out-of-hospital population is 5%-20%, the median PPV of the PHTL is 83% (95% credible interval [CrI] = 53% to 97%). However, if the population prevalence of STEMI is between 0.5% and 5%, the median PPV is 43% (95% CrI = 12% to 86%). When the PPV prediction intervals were incorporated with the Los Angeles County Emergency Medical Services Agency data, the PPV was 66%. CONCLUSIONS: Even when assuming high specificity for PHTL, the false-positive rate will be considerable if applied to a population at low risk for STEMI. Before broadening application of PHTL to low-risk patients, the implications of a high false-positive rate should be considered.

Emergency medical services system changes reduce pediatric epinephrine dosing errors in the prehospital setting.

OBJECTIVE: The goal was to describe the change in the rate of epinephrine dosing errors in the treatment of pediatric patients in prehospital cardiopulmonary arrest after the Los Angeles County Emergency Medical Services Agency instituted a program in which paramedics were required to use the Broselow tape and to report color zone categories to the base station and base stations were given and instructed formally in the use of the color-coded drug dosing chart. METHODS: An observational analysis of a natural experiment was performed. Children < or = 12 years of age who were determined to be in prehospital cardiopulmonary arrest and who received prehospital epinephrine treatment by paramedics, in the periods of 1994 to 1997 and 2003 to 2004, were included in the study. RESULTS: In the 1994 to 1997 cohort, we identified 104 subjects in prehospital cardiopulmonary arrest who received epinephrine with a documented weight and route of administration. Only 29 of 104 subjects in the 1994 to 1997 cohort received the correct dose, whereas 46 of 104 subjects received a first dose within 20% of the correct dose. In the 2003 to 2004 cohort, we identified 41 children < or = 12 years of age who were in cardiopulmonary arrest and received prehospital epinephrine treatment but 4 children were excluded, leaving 37 subjects. Twenty-one of 37 subjects received the correct dose, whereas 24 of 37 subjects received a dose within 20%. The odds ratio for obtaining the correct epinephrine dose after the system changes versus before was 3.0, and that for obtaining a dose within 20% of the correct dose was 2.5. CONCLUSIONS: The program seems to have resulted in reduction of the rate of epinephrine dosing errors in the prehospital treatment of children in cardiopulmonary arrest in Los Angeles County.