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Biomedical subjects

A L Kellermann

Publications and source records attributed to A L Kellermann.

At least 55 records · Page 3Linked to original sources
PubMed1994

Do blacks get bystander cardiopulmonary resuscitation as often as whites?

STUDY OBJECTIVE: To determine whether there is an association between the race of a victim of out-of-hospital cardiac arrest and the provision of bystander-initiated CPR. DESIGN: Record review of 1,068 consecutive cases of nontraumatic out-of-hospital cardiac arrest. SETTING: Memphis, Tennessee, a city of more than 600,000 with roughly equal numbers of white and black residents. PARTICIPANTS: Every adult who was seen by municipal emergency medical services personnel for nontraumatic cardiac arrest between March 1, 1989, and June 5, 1992. INTERVENTION: None. RESULTS: Although black and white cardiac arrest victims were similar in many respects, black victims received bystander CPR substantially less frequently than whites (9.8% versus 21.4%; odds ratio, 0.46; 95% confidence interval, 0.34 to 0.61). This difference was slightly more pronounced when the victim collapsed in a public place. In addition to race of the victim, location of the arrest outside the home and having the arrest witnessed were independent determinants of whether a victim was given bystander CPR. Multiple logistic regression analysis showed that the effect of race was independent of the other variables studied. CONCLUSION: Black victims of out-of-hospital cardiac arrest receive bystander CPR less frequently than white victims. Targeted training programs may be needed to improve the rates of bystander CPR among certain groups.

Black or African American↗
PubMed1994

Do guns matter?

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Firearms↗
PubMed1993

Impact of first-responder defibrillation in an urban emergency medical services system.

OBJECTIVE: To evaluate the impact of adding first-responder defibrillation by fire-fighters to an existing advanced life-support emergency medical services system. DESIGN: Nonrandomized, controlled clinical trial with periodic crossover. SETTING: Memphis, Tenn, a city of 610,337 people, which is served by a fire department-based emergency medical services system. All city ambulances provide advanced life support. PATIENTS: Adult victims of out-of-hospital cardiac arrest due to heart disease. INTERVENTION: Twenty of 40 participating engine companies were equipped with an automated external defibrillator and ordered to apply it immediately in all cases of cardiac arrest. The other 20 companies were ordered to start cardiopulmonary resuscitation (CPR) immediately and wait for paramedics to arrive. Every 75 days, group roles were reversed. Care otherwise proceeded according to 1986 American Heart Association guidelines. MAIN OUTCOME MEASURES: Return of spontaneous circulation in the field, survival to hospital admission, survival to hospital discharge, and neurological status at discharge. RESULTS: During the 39-month study interval, 879 patients were treated by a project engine company. Four hundred thirty-one (49%) of these were found in ventricular fibrillation. Bystander CPR was started in only 12% of cases. Overall, firefighters reached the scene a mean of 2.5 minutes faster than simultaneously dispatched paramedics. Although our automated external defibrillators proved to be reliable and efficacious for terminating ventricular fibrillation and pulseless ventricular tachycardia, patients treated by an automated external defibrillator-equipped engine company were no more likely than CPR-treated controls to be resuscitated (32% vs 34%, respectively), to survive to hospital admission (31% vs 29%), or to survive to hospital discharge (14% vs 10%). Neurological outcomes were also similar in the two treatment groups. CONCLUSIONS: In a fast-response, urban emergency medical services system served by paramedics, the impact of adding first-responder defibrillation appears to be small. Early defibrillation alone cannot overcome low community rates of bystander CPR. Careful attention to every link in the "chain of survival" is needed to achieve optimal rates of survival after cardiac arrest.

Aged↗
PubMed1993

Gun ownership as a risk factor for homicide in the home.

BACKGROUND: It is unknown whether keeping a firearm in the home confers protection against crime or, instead, increases the risk of violent crime in the home. To study risk factors for homicide in the home, we identified homicides occurring in the homes of victims in three metropolitan counties. METHODS: After each homicide, we obtained data from the police or medical examiner and interviewed a proxy for the victim. The proxies' answers were compared with those of control subjects who were matched to the victims according to neighborhood, sex, race, and age range. Crude and adjusted odds ratios were calculated with matched-pairs methods. RESULTS: During the study period, 1860 homicides occurred in the three counties, 444 of them (23.9 percent) in the home of the victim. After excluding 24 cases for various reasons, we interviewed proxy respondents for 93 percent of the victims. Controls were identified for 99 percent of these, yielding 388 matched pairs. As compared with the controls, the victims more often lived alone or rented their residence. Also, case households more commonly contained an illicit-drug user, a person with prior arrests, or someone who had been hit or hurt in a fight in the home. After controlling for these characteristics, we found that keeping a gun in the home was strongly and independently associated with an increased risk of homicide (adjusted odds ratio, 2.7; 95 percent confidence interval, 1.6 to 4.4). Virtually all of this risk involved homicide by a family member or intimate acquaintance. CONCLUSIONS: The use of illicit drugs and a history of physical fights in the home are important risk factors for homicide in the home. Rather than confer protection, guns kept in the home are associated with an increase in the risk of homicide by a family member or intimate acquaintance.

Adolescent↗
PubMed1993

Engineering excellence: options to enhance firefighter compliance with standing orders for first-responder defibrillation.

STUDY OBJECTIVE: To assess the quality of care delivered during first-responder defibrillation and to determine the potential efficacy of modifying existing automated external defibrillator designs to improve first-responder performance. DESIGN: Prospective case series. SETTING: An urban emergency medical services system providing first-responder defibrillation and paramedic care. TYPE OF PARTICIPANTS: Firefighters who completed a four-hour (two-session) course in automated external defibrillator operation. METHODS: Heartstart 2000 defibrillators (Laerdal Medical Corp, Armonk, New York) were used in 241 consecutive resuscitation attempts. Written reports and memory module printouts were abstracted to assess firefighter performance of 11 critical actions. The firefighter's response to each opportunity to perform a critical action was scored using explicit pass/fail criteria. RESULTS: Records of 235 automated external defibrillator uses (97.5%) were submitted for analysis. Firefighters shocked within 15 seconds of a "shock indicated" message in 95% of opportunities and reanalyzed the rhythm within 90 seconds of the third consecutive shock (ie, after one minute of CPR) in 80% of cases. However, firefighters reanalyzed the patient's rhythm too soon in 75% of cases, thereby interfering with recommended intervals of CPR. Firefighters failed to reanalyze the patient's rhythm after device-initiated "check patient" prompts 62% of the time. Memory modules were left in the automated external defibrillator during practice sessions in 64 cases, decreasing available memory to monitor automated external defibrillator use in the field. Three instances of failure to withhold CPR during rhythm analysis resulted in a single inappropriate patient shock. No firefighter was shocked inadvertently. CONCLUSION: Current device algorithms result in effective delivery of the initial three shocks. However, firefighters often fail to interpose recommended intervals of CPR between further attempts at defibrillation. Modification of existing device algorithms to provide additional visual and auditory cues may be preferable to relying on the user to recall accurately all the steps in this infrequently performed procedure.

Allied Health Personnel↗
PubMed1993

Criteria for dead-on-arrivals, prehospital termination of CPR, and do-not-resuscitate orders.

In contrast to the current consensus that governs the mechanics of prehospital advanced cardiac life support (ACLS), uniform criteria for determining when to initiate, withhold, or terminate ACLS in the field do not exist. Most emergency medical services (EMS) permit paramedics and other prehospital providers to withhold resuscitation when the victim obviously is dead, but the accuracy and appropriateness of this judgement in the field have not been subjected to empiric research. Do-not-resuscitate orders on patients in community settings often are problematic when paramedics and other prehospital providers are governed by standing orders that require them to initiate CPR when it is indicated medically. To date, eight states and a number of local EMS systems have developed a variety of policies to address this dilemma. Currently, few services permit paramedics to terminate ACLS in the field when such efforts fail to achieve return of spontaneous circulation. Studies have demonstrated convincingly that the rapid transport of such patients for further attempts at resuscitation in the hospital yields dismal rates of survival. The costs, risks, and benefits of this practice in community settings must be reviewed carefully to allocate EMS resources in an optimal manner.

Cardiopulmonary Resuscitation↗
PubMed1992

Suicide in the home in relation to gun ownership.

BACKGROUND: It has been suggested that limiting access to firearms could prevent many suicides, but this belief is controversial. To assess the strength of the association between the availability of firearms and suicide, we studied all suicides that took place in the homes of victims in Shelby County, Tennessee, and King County, Washington, over a 32-month period. METHODS: For each suicide victim (case subject), we obtained data from police or the medical examiner and interviewed a proxy. Their answers were compared with those of control subjects from the same neighborhood, matched with the victim according to sex, race, and age range. Crude and adjusted odds ratios were calculated with matched-pairs methods. RESULTS: During the study period, 803 suicides occurred in the two counties, 565 of which (70 percent) took place in the home of the victim. Fifty-eight percent (326) of these suicides were committed with a firearm. After excluding 11 case subjects for various reasons, we were able to interview 80 percent (442) of the proxies for the case subjects. Matching controls were identified for 99 percent of these subjects, producing 438 matched pairs. Univariate analyses revealed that the case subjects were more likely than the controls to have lived alone, taken prescribed psychotropic medication, been arrested, abused drugs or alcohol, or not graduated from high school. After we controlled for these characteristics through conditional logistic regression, the presence of one or more guns in the home was found to be associated with an increased risk of suicide (adjusted odds ratio, 4.8; 95 percent confidence interval, 2.7 to 8.5). CONCLUSIONS: Ready availability of firearms is associated with an increased risk of suicide in the home. Owners of firearms should weigh their reasons for keeping a gun in the home against the possibility that it might someday be used in a suicide.

Adult↗
PubMed1992

Physician staffing in the emergency departments of public teaching hospitals: a national survey.

STUDY HYPOTHESIS: To evaluate factors influencing emergency physician staffing patterns in an important subset of US hospitals. DESIGN: Survey of emergency department directors and hospital administrators. PARTICIPANTS: Member institutions of the National Association of Public Hospitals and the Council of Teaching Hospitals. MEASUREMENTS: Of 498 hospitals enrolled, two mailings and telephone follow-up yielded 277 replies (56% response rate). To adjust for differences in ED size and volume, levels of staffing were converted to full-time equivalents (FTEs) per 10,000 annual ED visits. RESULTS: Responding institutions included 160 private and 115 public hospitals, 74 of which were Veterans Administration hospitals. Formal medical school affiliation was noted by 86% of responding institutions, and 82 (30%) supported emergency medicine residency programs. Full-time attending emergency physician staffing varied widely, from less than one to more than three FTEs per 10,000 visits; however, mean levels of staffing at public hospitals did not differ significantly from private institutions (2.7 +/- 1.6 vs 2.5 +/- 3.1, respectively; P = .50). Three of four hospitals reported using part-time emergency physician attending but only 33% used nurse practitioners or physicians' assistants. Two thirds of responding hospitals used rotating house officers-in-training. Of note, hospitals that supported emergency medicine residency programs reported significantly higher levels of staffing by housestaff (2.2 +/- 1.8 vs 1.0 +/- 1.2 FTEs/10,000 visits; P less than .0004), but levels of total staffing by full- and part-time attending physicians were virtually identical (2.69 +/- 1.6 vs 2.67 +/- 2.6 FTEs/10,000 visits; respectively; P = .95). Marked variability in levels and patterns of ED staffing at public and teaching hospitals currently exists, but the differences are not explained by hospital ownership. The reasons for such variations and their implications for patient care must be explored.

Data Collection↗
PubMed1992

Men, women, and murder: gender-specific differences in rates of fatal violence and victimization.

To study the potential differences that distinguish homicides involving women as victims or offenders from those involving men, we analyzed Federal Bureau of Investigation Uniform Crime Reports data on homicides that occurred in the United States between 1976 and 1987. Only cases that involved victims aged 15 years or older were included. Persons killed during law enforcement activity and cases in which the victim's gender was not recorded were excluded. A total of 215,273 homicides were studied, 77% of which involved male victims and 23% female victims. Although the overall risk of homicide for women was substantially lower than that of men (rate ratio [RR] = 0.27), their risk of being killed by a spouse or intimate acquaintance was higher (RR = 1.23). In contrast to men, the killing of a woman by a stranger was rare (RR = 0.18). More than twice as many women were shot and killed by their husband or intimate acquaintance than were murdered by strangers using guns, knives, or any other means. Although women comprise more than half the U.S. population, they committed only 14.7% of the homicides noted during the study interval. In contrast to men, who killed nonintimate acquaintances, strangers, or victims of undetermined relationship in 80% of cases, women killed their spouse, an intimate acquaintance, or a family member in 60% of cases. When men killed with a gun, they most commonly shot a stranger or a non-family acquaintance.(ABSTRACT TRUNCATED AT 250 WORDS)

Family↗
PubMed1991

Too sick to wait.

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Emergency Service, Hospital↗
PubMed1991

Critical decision making: managing the emergency department in an overcrowded hospital.

Hospital and emergency department overcrowding is a serious and growing problem nationwide. Although EDs are organized around the goals of rapid patient assessment, stabilization, and prompt admission to the hospital, an increasing number are being required to hold admitted floor and critical care patients for extended periods due to lack of vacant inpatient beds. Provision of acceptable patient care under such circumstances requires a fundamental reordering of ED priorities and procedures. Overcrowding is the result of inadequate funding for emergency health care services during a period of increasing demand. The initial focus of management strategies to resolve this problem is the inpatient area and includes evaluation of length of stay, "intent to discharge" policies, flexible bed designations, restriction of in-house transfers, and the use of "over-census beds." If in-hospital management strategies fail, modifications in ED management may include staffing contingency plans, definition of physician responsibility, inpatient charts, revised pharmacy formulary, new floor plans, and modified accounting systems. Successful resolution of hospital and ED overcrowding may be the greatest challenge facing emergency medicine today.

Bed Conversion↗