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Biomedical subjects

R A Swor

Publications and source records attributed to R A Swor.

At least 19 recordsLinked to original sources
PubMed2000

Does advanced age matter in outcomes after out-of-hospital cardiac arrest in community-dwelling adults?

OBJECTIVE: To assess whether advanced age is an independent predictor of survival to hospital discharge in community-dwelling adult patients who sustained an out-of-hospital cardiac arrest in a suburban county. METHODS: A prospective cohort study was conducted in a suburban county emergency medical services system of community-dwelling adults who had an arrest from a presumed cardiac cause and who received out-of-hospital resuscitative efforts from July 1989 to December 1993. The cohorts were defined by grouping ages by decade: 19-39, 40-49, 50-59, 60-69, 70-79, and 80 or more. The variables measured included age, gender, witnessed arrest, response intervals, location of arrest, documented bystander cardiopulmonary resuscitation, and initial rhythms. The primary outcome was survival to hospital discharge. Results are reported using analysis of variance, chi square, and adjusted odds ratios from a logistic regression model. Age group 50-59 served as the reference group for the regression model. RESULTS: Of the 2,608 total presumed cardiac arrests, the overall survival rate to hospital discharge was 7.25%. Patients in age groups 40-49 and 50-59 experienced the best rate of successful resuscitation (10%). Each subsequent decade had a steady decline in successful outcome: 8.1% for ages 60-69; 7.1% for ages 70-79; and 3.3% for age 80+. In a post-hoc analysis, further separation of the older age group revealed a successful outcome in 3.9% of patients ages 80-89 and 1% in patients 90 and older. Patients aged 80 years or more were more likely to arrest at home, were more likely to have an initial bradyasystolic rhythm, yet had a similar rate of resuscitation to hospital admission. In the regression model, age 80 or older was associated with a significantly worse survival to hospital discharge (OR = 0.4, 95% CI = 0.20 to 0.82). CONCLUSIONS: There was a twofold decrease in survival following out-of-hospital cardiac arrest to discharge in patients aged 80 or more when compared with the reference group in this suburban county setting. However, resuscitation for community-dwelling elders aged 65-89 is not futile. These data support that out-of-hospital resuscitation of elders up to age 90 years is not associated with a universal dismal outcome.

Adult↗
PubMed1997

Who gets bystander cardiopulmonary resuscitation in a witnessed arrest?

OBJECTIVE: To identify characteristics associated with provision of bystander CPR in witnessed out-of-hospital cardiac arrest cases. METHODS: An observational, prospective, cohort study was performed using cardiac arrest cases as identified by emergency medical services (EMS) agencies in Oakland County. MI, from July 1, 1989, to December 31, 1993. All patients who sustained a witnessed arrest prior to arrival of EMS personnel were reviewed. RESULTS: Of the 927 patients meeting entry criteria, the 229 patients receiving bystander CPR were younger: 60.9 +/- 14.7 vs 67.9 +/- 14.7 years (p < 0.01). Most (76.6%) cardiac arrests occurred in the home. In a multivariate logistic model, only the location of arrest outside the home was a significant predictor of receiving bystander CPR [odds ratio (OR) 3.8; 99% CI 2.5, 5.9]. Arrests outside the home were associated with significantly improved outcome, with 18.2% of out-of-home and 8.2% of in-home victims discharged from the hospital alive (OR 2.5; 99% CI 1.4, 4.4). CONCLUSION: Patients who have had witnessed cardiac arrests outside the home are nearly 4 times more likely to receive bystander CPR, and are twice as likely to survive. This observation emphasizes the need for CPR training of family members in the authors' locale. This phenomenon may also represent a significant confounder in studies of out-of-hospital cardiac arrest and resuscitation.

Age Factors↗
PubMed1995

Clinical decision rules discriminate between fractures and nonfractures in acute isolated knee trauma.

STUDY OBJECTIVE: To develop criteria that optimize clinical decisionmaking in the use of radiography after isolated knee trauma in adults. DESIGN: A prospective survey of emergency department patients over a 7-month period. Standardized data forms were completed by emergency physicians, residents, and certified physician assistants. SETTING: A large suburban community teaching hospital. PARTICIPANTS: Two hundred forty-two patients older than 17 years with isolated knee injuries sustained less than 24 hours previously. RESULTS: We constructed a clinical decision model, calculating sensitivity, specificity, and odds ratios. Twenty-eight patients (11.6%) had fractures, with the patella the most commonly fractured osseous structure. Patients able to walk without limping had not experienced a fracture, nor had patients with twist injuries without effusion. Sensitivity of this model for detecting fracture was 1.0 (99% confidence interval, .97 to 1.0), and specificity was .337 (99% confidence interval, .26 to .42). CONCLUSION: Clinical decision rules are effective in detecting knee fractures with 100% sensitivity and with sufficient specificity to eliminate 29% of knee radiographs in the ED. These findings require prospective validation.

Adolescent↗
PubMed1995

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

STUDY OBJECTIVE: To assess whether bystander CPR (BCPR) on collapse affects initial rhythm and outcome in patients with witnessed, unmonitored out-of-hospital cardiac arrest (OHCA). DESIGN: Prospective cohort study. Student's t test, the chi 2 test, and logistic regression were used for analysis. SETTING: Suburban emergency medical service (EMS) system. PARTICIPANTS: Patients 19 years or older with witnessed OHCA of presumed cardiac origin who experienced cardiac arrest before EMS arrival between July 1989 and July 1993. RESULTS: Of 722 patients who met the entry criteria, 153 received BCPR. Patients who received BCPR were younger than those who did not: 62.5 +/- 15.4 years versus 66.8 +/- 15.1 years (P < .01). We found no differences in basic or advanced life support response intervals or in frequency of AED use. More patients initially had ventricular fibrillation (VF) in the BCPR group: 80.9% versus 61.4% (P < .01). The interval to definitive care for ventricular tachycardia (VT)/VF was longer for the BCPR group (8.59 +/- 5.3 versus 7.45 +/- 4.7 minutes; P < .05). The percentage of patients discharged alive who were initially in VT/VF was higher in the BCPR group: 18.3% versus 8.4% (P < .001). In a multivariate model, BCPR is a significant predictor for VT/VF and live discharge with adjusted ORs of 2.7 (95% CI, 1.7 to 4.4) and 2.4 (95% CI, 1.5 to 4.0), respectively. For those patients in VT/VF, BCPR predicted live discharge from hospital with an adjusted OR of 2.1 (95% CI, 1.2 to 3.6). CONCLUSION: Patients who receive BCPR are more often found in VT/VF and have an increased rate of live discharge, with controls for age and response and definitive care intervals. For VT/VF patients, BCPR is associated with an increased rate of live discharge.

Adult↗
PubMed1995

Sensitivity of the Ottawa rules.

STUDY OBJECTIVE: To validate criteria predicting ankle and mid-foot fractures with 100% sensitivity. DESIGN: Prospective validation study SETTING: A 929-bed community teaching hospital with an annual census of 76,488 ED visits. PARTICIPANTS: Convenience sample of patients older than 18 years with acute ankle or midfoot injury. INTERVENTIONS: Radiography was performed in each patient received after pertinent history and physical examination findings were recorded. RESULTS: Five hundred seventy radiographs were obtained in 484 patients. Four hundred twenty-one were of the ankle, and 149 were of the foot. There were 93 ankle fractures and 29 midfoot fractures, giving a fracture yield of 22.1% for ankle films and 19.5% for foot films. Decision rules had sensitivity of 94.6% and specificity of 15.5% for ankle fractures and sensitivity of 93.1% and specificity of 11.5% for midfoot fractures. Prospective criteria failed to predict fracture in five of the ankle group and two of the midfoot group. Physicians predicting fracture solely on the basis of clinical suspicion had a sensitivity of 69% in ankle injuries and 76% in midfoot injuries. CONCLUSION: We were unable to validate with 100% sensitivity the Ottawa rules predicting ankle and midfoot fractures. However, the Ottawa rules were more sensitive than clinical suspicion alone.

Adolescent↗
PubMed1995

Bystander vs EMS first-responder CPR: initial rhythm and outcome in witnessed nonmonitored out-of-hospital cardiac arrest.

OBJECTIVES: To assess whether outcome and first-monitored rhythm for patients who sustain a witnessed, nonmonitored, out-of-hospital cardiac arrest are associated with on-scene CPR provider group. METHODS: A retrospective, cohort analysis was conducted in a suburban, heterogeneous EMS system. Patients studied were > or = 19 years of age, had had an arrest of presumed cardiac origin between July 1989 and January 1993, had gone into cardiac arrest prior to ALS arrival, and had received CPR on collapse. First-monitored rhythms and survival rates were compared for two patient groups who on collapse either: 1) had received CPR by nonprofessional bystanders (BCPR) or 2) had received CPR by on-scene EMS system first responders (FRCPR). RESULTS: Of 217 cardiac arrest victims, 153 (71%) had received BCPR and 64 (29%) had received FRCPR. The BCPR patients were slightly younger (62.4 vs 68.4 years, p = 0.01) and had slightly shorter ALS response intervals (6.4 vs 7.7 minutes, p = 0.02). There was no difference in BLS response time intervals or automatic external defibrillator (AED) use rates. The percentage of patients with a first-monitored rhythm of pulseless ventricular tachycardia/ventricular fibrillation (VT/VF) and the percentage of patients grouped by CPR provider who survived to hospital admission or to hospital discharge were: [see text]

Adult↗
PubMed1993

Inter-rater agreement of paramedic rhythm labeling.

STUDY HYPOTHESIS: Substantial inter-rater agreement is present in the labeling by paramedics of ventricular fibrillation and asystolic rhythms. DESIGN: Prospective, cross-sectional study. TYPE OF PARTICIPANTS: One hundred five practicing paramedics from nonvolunteer agencies who are advanced cardiac life support certified. METHODS: Five static cardiac arrest rhythm strips, classified by Cummins' average peak amplitude method, were arranged into five different orders of presentation and placed into five booklets. The paramedics were instructed to label each rhythm ventricular fibrillation or asystole based on rhythm recognition, not on treatment plan. RESULTS: The overall kappa value for labeling the five rhythms was .63, indicating a moderate degree of inter-rater agreement. However, as the rhythm's amplitude decreased, the amount of inter-rater agreement also decreased. When the amplitude was approximately 1 mm, agreement was no different than chance; the proportion of paramedics labeling the rhythm ventricular fibrillation was .46 (95% confidence interval, .36, .56). Only a flat line (0 mm) demonstrated perfect inter-rater agreement, with no paramedic labeling the rhythm ventricular fibrillation. CONCLUSION: Inter-rater agreement of ventricular fibrillation rhythm labeling by paramedics in this emergency medical services system was amplitude dependent. An analysis of ventricular fibrillation rhythm data that does not address the degree of inter-rater agreement of rhythm labeling cannot ensure uniform reporting of out-of-hospital cardiac arrest data.

Cross-Sectional Studies↗
PubMed1992

Quality assurance in EMS systems.

QA activities in EMS systems are severely hampered unless a central agency exists to coordinate data collection, funding, and communication between agencies and field providers. EMS systems must address these issues successfully to maximize their efforts. Some regions (San Francisco, King County, Washington, Burbank, California) have developed dedicated organizations for the evaluation of prehospital care. These organizations can greatly reduce the logistic impediments to evaluating EMS care and initiating improvements. A clear goal of any QA program is improved patient care. This noble goal by itself will not move an EMS system to embrace needed changes. Other compelling reasons for organizations to support quality management activities include decreased costs resulting from improved efficiency. QA programs may improve provider morale as a result of participation in the move toward excellence, and pride in workmanship. One survey found an improved sense of teamwork after initiating these programs. Patients must receive quality emergency medical care from the moment they enter the health care system. Leadership by the medical community is crucial if this goal is to be realized.

Data Collection↗
PubMed1990

A computer-assisted quality assurance audit in a multiprovider EMS system.

Prehospital care delivered by multiple agencies and their paramedics in a suburban emergency medical services (EMS) system was compared to assess the impact of a receiving hospital quality assurance audit on paramedic and agency performance. A committee of physicians, nurses, and paramedics developed performance criteria based on a county EMS protocol. Run tapes were reviewed to assess accuracy of runsheets. Deviations were categorized and tabulated with Lotus 1-2-3 software. A profile was developed for each agency and paramedic. Results were returned to supervisors of each agency on an intermittent basis with subsequent feedback to paramedics. Four agencies and 100 paramedics were audited during the 18-month study period, with a total of 2,406 runsheets reviewed. Average deficiencies per run per quarter for all paramedics decreased from 0.47 to 0.34 (P less than .006). For one agency, deficiencies per run declined from 1.98 to 1.06, although this was not statistically significant (P = .068). During the second nine-month segment of the study, the records of 62 paramedics were reviewed. A mean deficiency per run of 0.39 +/- 0.55 was found, with four paramedics performing more than two standard deviations from the mean. This receiving hospital EMS quality assurance audit has helped document problems in agency procedure performance and individual paramedic performance. It also has improved compliance with county protocol on patients delivered to our institution.

Clinical Competence↗
PubMed1989

Outcomes in unsuccessful field resuscitation attempts.

To determine the outcomes of patients who did not regain vital signs after prehospital advanced cardiac life support, we studied adult patients who sustained nontraumatic out-of-hospital cardiac arrest. Our study consisted of a 20-month retrospective review of 244 charts beginning January 1986. Twelve patients were excluded for drug overdose, family request, or unavailable data. Of the remaining 232 patients, 51 had a rhythm and pulse on arrival at the emergency department. The record of each of the remaining 181 patients was analyzed for age, sex, location, witness, CPR initiator, advanced life support unit response time, initial field rhythm, and initial ECG rhythm. Outcome alternatives were dead in emergency department or hospital admission. All hospitalized patients were further evaluated for survival to discharge and neurologic status at discharge. Ten of the 181 patients (6%) who failed prehospital resuscitation survived to hospitalization, and one (0.6%) was discharged neurologically intact. Survival to hospital admission did not correlate with any of the variables studied except gender. The one patient who survived a failed prehospital resuscitation was not endotracheally intubated in the field. Our data support the practice of pronouncing adult nontraumatic cardiac arrest victims who fail to respond to advanced cardiac life support efforts in the field as dead at the scene.

Adolescent↗