Can better basic and advanced cardiac life support improve outcome from cardiac arrest?

Coma Following Cardiac Arrest: A Review of the Clinical Features, Management, and Prognosis

Sudden cardiac death is an important clinical problem that accounts for 750,000 deaths in the United States each year. There are 200,000 cardiac resuscitations each year, of which only 70,000 are successful. Survival depends upon early cardiopulmonary resuscitation and defibrillation. The brain's ability to tolerate no more than a few minutes of circulatory arrest is the major factor limiting the success of cardiopulmonary resusci tation. Cardiac arrest results in a spectrum of clinical disorders depending on the severity of cerebral anoxia. Neurological sequelae in survivors range from transient states of confusion and amnesia to prolonged uncon sciousness in a coma or in the vegetative state. Sequen tial neurological examinations alone or in conjunction with evoked potentials, electroencephalogram, com puted tomography, and positron emission tomography can indicate the degree of central nervous system dam age and the likely outcome. The clinical management of patients in coma following cardiac arrest involves resto ration of cardiopulmonary and metabolic homeostasis. No effective delayed therapy yet exists that can reverse anoxic damage, but several promising therapeutic agents are under laboratory and clinical investigation.

Retention of skills in neonatal resuscitation

OBJECTIVES

To evaluate the impact of a neonatal resuscitation course on the theoretical knowledge and practical skills of birthing room personnel, and to evaluate the performance of skills at different times after the course.

DESIGN

A program evaluation using a before and after cohort study.

SETTING

Seven level II perinatal centres in the central-east region of Ontario.

PARTICIPANTS

Seven hundred thirty-seven individuals (medical staff, nurses and respiratory technologists) who worked in birthing rooms.

INTERVENTION

During an eight-month period, a course in neonatal resuscitation was presented at the perinatal centres. A cohort of 108 (15%) participants received testing before and after the course; the theoretical knowledge and practical performance of 62 of these participants were retested after six and 12 months.

RESULTS

A significant improvement in both theoretical knowledge and practical skills was seen immediately after the course. Throughout the study, no difference was observed in the performance of nursing staff compared with that of medical staff, nor among the institutions involved. No significant difference in the decline of either theoretical knowledge or practical skills was seen among those who scored well in the original pre-test compared with those who scored poorly.

CONCLUSIONS

Neonatal resuscitation should be an integral part of continuing education for all personnel involved in obstetrical care because it improves both tested knowledge and performance. Practical skills appear to decline faster than theoretical knowledge. Inservice instruction is required, at least, every six months.

Hospital employees' theoretical knowledge on what to do in an in-hospital cardiac arrest

Background

Guidelines recommend that all health care professionals should be able to perform cardiopulmonary resuscitation (CPR), including the use of an automated external defibrillator. Theoretical knowledge of CPR is then necessary.

The aim of this study was to investigate how much theoretical knowledge in CPR would increase among all categories of health care professionals lacking training in CPR, in an intervention hospital, after a systematic standardised training. Their results were compared with the staff at a control hospital with an ongoing annual CPR training programme.

Methods

Health care professionals at two hospitals, with a total of 3144 employees, answered a multiple-choice questionnaire before and after training in CPR. Bootstrapped chi-square tests and Fisher's exact test were used for the statistical analyses.

Results

In the intervention hospital, physicians had the highest knowledge pre-test, but other health care professionals including nurses and assistant nurses reached a relatively high level post-test. Improvement was inversely related to the level of previous knowledge and was thus most marked among other health care professionals and least marked among physicians.

The staff at the control hospital had a significantly higher level of knowledge pre-test than the intervention hospital, whereas the opposite was found post-test.

Conclusions

Overall theoretical knowledge increased after systematic standardised training in CPR. The increase was more pronounced for those without previous training and for those staff categories with the least medical education.

Appropriateness of a Resuscitation Council (UK) advanced life support course for primary care dentists

OBJECTIVES

To investigate whether a standard Resuscitation Council (UK) ALS course is appropriate for primary care dentists or whether a course should be specifically designed for dentists.

DESIGN

Opinions canvassed by pre-course expectation and post-course evaluation questionnaires.

SUBJECTS

23 West Pennine primary care dentists providing a general anaesthetic or conscious sedation service who attended an ALS course.

RESULTS

Knowledge and skills were rated on a 5-point scale from 1 (not important at all) to 5 (extremely important). Basic airway management (mean = 5) and anaphylaxis (mean = 4.9) scored the highest on the 'expectation' questionnaire. Rhythm recognition (P < 0.001), defibrillation (P = 0.007) and arrest algorithms (P = 0.047) were rated as significantly more important after the course than before. Knowledge about rhythm disorder management, cardiac pacing, post-resuscitation care, blood gas interpretation and bereavement were not considered to be so important either before or after the course.

CONCLUSIONS

Despite rating some aspects as unimportant, all dentists stated that this course had been appropriate. They did not want a specially designed ALS course for dentistry. Taking exactly the same recognised course and assessments as other healthcare professionals and gaining the same certification was felt to be important to this group of dentists.

An evaluative study of the basic life support skills of nurses in an independent hospital

This paper reports on a research study carried out in an independent hospital in the south east of England. The aim of the study was to assess the basic life support skills of nurses in order to compare the results with those reported for nurses in public hospitals. The findings show that the basic life support skills of the nurses studied are poor but no worse than those of their public sector colleagues.

Evaluation of cardiopulmonary resuscitation skills of general practitioners using different scoring methods

In this study we evaluated the practical performance of 70 general practitioners in cardiopulmonary resuscitation (CPR) before and after instruction and compared checklist-based scores to mechanical recording scores in order to investigate which scoring method is preferable. Both checklist and recording strip-based scores showed significant improvement after instruction, but only 37% were judged proficient according to the American Heart Association standards (checklist scoring), and 47% according to the recording print-based scoring system, while rates judged 97% as satisfactory by general impression. Interrater reliability was highest for the recording print (0.97) and lower for the checklist (0.79), especially for CPR performance (0.56). Comparison of checklist and recording print showed that the checklist was specific but not very sensitive in identifying poor performance for cardiac compression rate, since observers overestimated performance. The correlation for CPR performance between checklist score and recording strip score was low (0.45), indicating that candidates were ranked differently. The correlation between diagnosis and performance score was low for checklist as well as recording print (0.22), indicating that the score on diagnosis was a poor predictor for the score on performance of CPR. These results support the use of the recording manikin as compared with the use of a checklist for formative evaluation of basic life support skills. However, as proficiency in diagnosis and performance in CPR are poorly correlated, assessment of diagnosis using a checklist must be included. Therefore we strongly recommend the combination of assessment by observers using a checklist for diagnostic procedures and the recording strip of the manikin for performance of CPR, as employed in most evaluation schemes.

Future directions for resuscitation research. II. External cardiopulmonary resuscitation basic life support

In sudden cardiac deaths outside hospitals, the present performance of external cardiopulmonary resuscitation-basic life support (CPR-BLS), as a bridge to advanced life support (ALS) attempts for restoration of spontaneous circulation (ROSC), still yields suboptimal results. Therefore, future education research should develop more effective, simpler and quicker ways to enable everyone to acquire the necessary BLS skills. Individualized self-training by lay persons is being revived. Although airway control and direct mouth-to-mouth ventilation skills are difficult to acquire, they must continue to be taught to the lay public and health professionals, primarily for use on relatives and friends where infection risk is not a problem. In children and trauma victims, steps A and B alone may be lifesavers. The best way to ventilate and oxygenate during the initiation of brief external CPR-BLS should be re-evaluated. There is a great difference between animals and humans in the behavior of the airway and thorax during coma, and thus in the need for added positive pressure ventilation. During chest compressions in humans, steps A and B are needed. Details deserve re-evaluation. The low perfusion pressures (borderline blood flows) produced by standard external CPR remain the most serious limitation of this method. In spite of extensive efforts so far, novel laboratory research to remedy this limitation is important for the development of more effective emergency artificial circulation. The results of such studies are greatly influenced by different details in animal models. Active compression-decompression (ACD) external CPR, also called 'push-pull' CPR, with a plunger-type device used by hand or a machine, and intermittent abdominal compression (IAC) external CPR are both promising modifications of standard external CPR. Both need further experimental and clinical clarification. For BLS, developing a more effective purely manual CPR-BLS method for help in rapid ROSC should be given high priority. Portable external CPR machines need improvements. They will serve for bridging ROSC-resistant cases through transport and ALS attempts, primarily by freeing the hands of health professionals for more effective sophisticated ALS measures.

Basic life support skill acquisition and retention in student nurses undertaking a pre-registration diploma in higher education/nursing course

Many studies have investigated the ability of health care professionals to provide competent Basic Life Support (BLS) and all results indicate that the majority of staff fail to demonstrate competence. However, it has not yet been shown whether this poor performance is due to deterioration of skill or the nonacquisition of the skill during BLS training. This study seeks to identify aspects of BLS acquisition and retention by student nurses during their three years of training. The two issues under consideration are the effect of teacher-student ratio and the effect of regular practice on BLS performance. This paper provides a review of the methodology and the initial findings.

Quality and efficiency of bystander CPR. Belgian Cerebral Resuscitation Study Group

Incorrectly performed bystander CPR might compromise survival of the cardiac arrest patient. We therefore evaluated the outcome in 3306 out-of-hospital primary cardiac arrests of which 885 received bystander CPR. bystanders performed CPR correctly in 52%, incorrectly in 11%, 31% performed only external chest compressions (ECC) and 6% only mouth-to-mouth ventilation (MMV). The initial ECG in cases without bystander CPR was ventricular fibrillation in 28% (95% confidence interval: 27-30%); 45% (41-50%) and 39% (29-48%), respectively when bystander CPR was performed correctly or incorrectly; 43% (37-49%) when only ECC was applied and 22% (11-33%) when only MMV was practiced. Long term survival, defined as being awake 14 days after CPR, was 16% (13-19%) in patients with correct bystander CPR; 10% (7-14%) and 2% (0-9%), respectively when only ECC or only MMV was performed; 7% (6-8%) when no bystander was involved; 4% (0-8%) when bystander CPR was performed incorrectly. Bystander CPR might have a beneficial effect on survival by maintaining the heart in ventricular fibrillation by ECC. A negative effect of badly performed bystander CPR was not observed compared to cases which had not received bystander CPR.

The Provision and Evaluation of a Neonatal Resuscitation Program

The need to train perinatal staff in neonatal resuscitation is widely accepted; however, standardized educational programs have not been available. This study used a randomized control trial to evaluate a one-day neonatal resuscitation education program with 190 nurses. Experimental subjects receiving the program had significantly improved knowledge and skill performance. Knowledge, but not skill performance, was maintained at six months for the experimental group. There was a significant relationship between subjects' self-rating of knowledge and performance, suggesting that this method could be used to prioritize staff for basic or refresher training. An effective format and evaluation instruments for neonatal resuscitation training have been developed. Strategies to maintain skills should be addressed in future research.

An investigation into why qualified nurses inappropriately describe their own cardiopulmonary resuscitation skills

Recent studies have indicated that significant numbers of nurses are ineffective in performing cardiopulmonary resuscitation (CPR). Furthermore, the studies indicate that many nurses are unable to appraise realistically their own CPR performance. This study sought to ascertain the reasons why qualified nurses are unable or unwilling to appraise themselves realistically with regard to resuscitation skills. The investigation employed both quantitative and qualitative methods to establish the existence of the phenomenon and facilitate its analysis. The findings of the study suggest that unrealistic self-appraisal arises out of poor and infrequent resuscitation training, nurses' attempts to identify with roles which they perceive they should fulfill and past experience of cardiac arrests. The data suggest that current resuscitation training is inadequate, inappropriate and inconsistent for the needs of practising nurses.

The problem of poor retention of cardiopulmonary resuscitation skills may lie with the instructor, not the learner or the curriculum

Many studies (several even before American Heart Association recommended in 1973 that lay public be trained in cardiopulmonary resuscitation (CPR] have documented that retention of CPR skills is poor, unaffected by modifications in curriculum or whether the students are lay or professional. We chose to investigate what actually occurs during a CPR course, and gained the following insights: despite clearly defined curricula, we found that instructors did not teach in a standardized way. Practice time was limited and errors in performance were not corrected. Instructors consistently rated the students' overall performance as acceptable; at the same time, using the same checklist, we consistently rated performance as unacceptable. The checklist is an inaccurate tool for evaluating CPR performance. Despite the poor performance that we documented, students and instructors were satisfied with the courses and believed that the level of performance was high. As a result of these studies, we discovered that the problem of poor retention of CPR skills may lie not with the learner or the curriculum, but with the instructor. But, since lives are being saved with bystander CPR, does this documented poor retention matter? Perhaps the solution is not only to improve instructor training to make certain that students receive adequate practice time and accurate skill evaluation, but also to modify the criteria for correct performance when testing for retention. These criteria should be based on the minimum CPR skills that are required to sustain life for the critical 4-8 min before defibrillation and other advanced cardiac life support are delivered.

Measuring cardiopulmonary resuscitation performance: a comparison of the Heartsaver checklist to manikin strip

Both checklists and recording manikin strips (strips) are used for evaluation of cardiopulmonary resuscitation (CPR) performance. To examine their relationship, we simultaneously evaluated single rescuer CPR of 255 subjects using both checklists and strips. For Group 1 (N = 192; general public tested in Heartsaver course) we compared the total number of initial ventilations and compressions judged to be correct by checklists with those judged to be correct by strips. For Group II (N = 63; physicians, nurses, general public tested in retention studies) we compared each subjects checklist with their own strip for evaluation of correct ventilations and compressions. In Group I, CPR was judged to be correct two to four times more frequently by checklists than by strips. In Group II, all correlations were poor. The most common disagreements were with performances evaluated as correct by checklist but not by strip. Therefore, the current checklist may be a poor instrument for measuring CPR. More accurate evaluation should improve learning and therefore improve outcome following cardiac arrest.

Cardiopulmonary resuscitation documentation: a survey of 135 medical centers

The pharmacist is an active member of the cardiopulmonary resuscitation (CPR) team in many hospitals, dispensing medications, maintaining records, providing drug information, calculating doses, and mixing intravenous fluids. We surveyed 135 emergency department nursing directors across the country to assess the methods of and persons responsible for documentation during CPR. Ninety-five (70 percent) completed surveys were returned, showing that documentations was usually done by a nurse (81 percent), by a nurse and pharmacist (9 percent), by a pharmacist (7 percent), or by others (ward clerks, paramedics, or physicians) (3 percent). CPR flowsheets (83 percent), nurses' notes (7 percent), or other methods (10 percent) including notes on paper towels and blackboards are used to record such information in the emergency department. Most respondents were fairly confident (49 percent) or very confident (48 percent) that they could recreate the resuscitative sequence from the information recorded; 2 percent did not have confidence in the reproducibility of the data. Respondents felt that cardiac rhythms (83 percent), drugs and dosages administered (34 percent), and temporal sequence of events (33 percent) could be more accurately recorded during CPR. A majority of respondents (57 percent) felt that an automated recording system would be useful. We conclude that there appears to be considerable variability in the method of documentation of events during CPR in emergency departments throughout the country. Future efforts in emergency care should include the involvement of pharmacists in the development and implementation of a uniform database for use by field and hospital personnel during CPR.