Biomedical subjects

Maaret Castrén

Publications and source records attributed to Maaret Castrén.

8 recordsLinked to original sources

PubMed2006

Increase in rapid defibrillation programmes after publication of guidelines.

OBJECTIVE: . To monitor the implementation of in-hospital resuscitation strategies including (i) rapid defibrillation programmes, (ii) the use of amiodarone for prolonged ventricular fibrillation, and (iii) uniform data collection on resuscitation, all recommended by international guidelines published in 2000 and by Finnish national resuscitation guidelines published in 2002. DESIGN: In 2004, a questionnaire was sent to the chief anaesthesiologists. The results were compared with those of a previous study performed using similar methods in 2000. SETTING: All public hospitals that provide anaesthetic services in Finland. MAIN OUTCOME MEASURES: Number of hospitals allowing nurses to perform defibrillation without the presence of physician and number of hospitals using amiodarone as primary antiarrhythmic drug in resuscitation and performing uniform data collection. RESULTS: The response rate was 95% (52/55). The proportion of the hospitals with rapid defibrillation programmes on general wards had increased from 15% in 2000 to 67% in 2004, and most (79%) hospitals had obtained automated external defibrillators. Amiodarone was used in 88% of the hospitals. Data collection of resuscitation attempts using definitions provided in the Utstein guidelines was performed only in 22% of the hospitals. CONCLUSIONS: Rapid defibrillation programmes have markedly increased, and the use of amiodarone has been established in Finnish hospitals since the publication of the international and the national resuscitation guidelines.

Advance Directives↗

PubMed2006

Effect of protocol compliance to cardiac arrest identification by emergency medical dispatchers.

OBJECTIVES: The objective of the study was to assess the effect of protocol compliance to the accuracy of cardiac arrest (CA) identification by the dispatchers. METHODS: The study was conducted prospectively over a 1-year period in 1996. The calls categorized as non-traumatic CAs by the dispatcher and calls where the patient was in non-traumatic CA when ambulance crew arrived were included in the study. The data was collected from emergency call tape recordings and ambulance run sheets. The compliance to the protocol was defined as gathering information to two questions: (1) Is the patient awake or can she/he be awakened? and (2) Is she/he breathing normally? RESULTS: The number of calls included in the study was 776 and the dispatchers identified 83% of the CAs. The protocol was adhered in 52.4% of calls, more often in witnessed than unwitnessed cases (72.3% versus 45.0%, P<0.001). In correctly identified CAs, the protocol compliance was 49.4%. The compliance was higher in cases of unidentified CAs (60.3%, P=0.0326) and in cases of wrongly identified as CAs (false positives, 61.9%, P=0.0276). CONCLUSIONS: A high identification rate of CAs seems to be achievable despite poor protocol compliance by dispatchers.

Allied Health Personnel↗

PubMed2006

Reduced survival following resuscitation in patients with documented clinically abnormal observations prior to in-hospital cardiac arrest.

BACKGROUND: Patients suffering in-hospital cardiac arrest (IHCA) often have abnormal clinical observations documented prior to the arrest. This study assesses whether these patients have a less favourable outcome following IHCA. METHODS: A multiple logistic regression analysis of retrospectively collected hospital chart data and prospectively collected Utstein style resuscitation data. Patients were defined as having abnormal clinical observations if they had one of the following documented 8 h before the arrest: systolic arterial blood pressure below 90 or over 200, pulse rate below 40 or over 140 beats per min or oxygen saturation below 90% with or without supplemental oxygen. Pre-arrest variables included were: age, sex and functional status, co-morbidities, reason for hospital admission, days in the hospital before the arrest, witnessed or un-witnessed arrest, arrest occurring outside regular working hours, monitored or non-monitored ward, whether basic life support was performed before the arrival of the resuscitation team, delay to arrival of resuscitation team and initial rhythm. RESULTS: Survival to hospital discharge of patients with clinically abnormal observations was 9% and among those without 18% (p=0.037). Independent pre-arrest predictors of survival were: un-witnessed arrest (odds ratio [OR] 0.1, confidence interval (CI) 0.01-0.8), initial rhythm other than ventricular fibrillation or ventricular tachycardia (OR 0.13, CI 0.05-0.3), delay to arrival of the resuscitation team exceeding 2 min (median) (OR 0.4, CI 0.15-0.9) and the presence of documented clinical abnormal observations prior to the arrest (OR 0.3, CI 0.09-0.95). CONCLUSIONS: Patients with documented clinically abnormal observations before IHCA have a worse outcome than those without, despite prompt resuscitation. Efforts should be made to identify these patients in time, thereby possibly avoiding the arrest. This can also be used when assessing the prognosis in IHCA.

Aged↗

PubMed2005

Layperson positioning of defibrillation electrodes guided by pictorial instructions.

BACKGROUND: Correct positioning of defibrillation electrodes is essential to achieve sufficient transmyocardial current to depolarize a critical mass of myocardium, and thus terminate ventricular fibrillation (VF). AIM: To evaluate the pictures on the self-adhesive defibrillation electrodes in guiding laypersons to place the electrodes in the recommended position. METHODS: Defibrillation electrodes from five manufactures (Access Cardio Systems, Schiller, Medtronic, Cardiac Science and Philips) were included in the study and compared with electrodes with a lateral view picture, designed for the study, showing the placement of the apical electrode. A total of 150 laypersons without any experience or training in use of a defibrillator participated in the study. The participants placed randomly selected electrodes on the chest of a resuscitation manikin without any guidance apart from the pictures on the electrodes. The distances of the electrodes from the recommended positions were measured. RESULTS: The proportion of participants who placed both electrodes within 5 cm from recommended position varied from 8% to 36% with the different electrodes. Usually, the apical electrode was placed too anteriorly. Electrodes placed with help of the lateral instruction picture, (designed for the study), showing the placement of the apical electrode were placed significantly more often within 5 cm than any of the others (64%, 95% confidence interval 44-80, P < 0.05). CONCLUSIONS: The current practice in designing pictures on the electrodes does not seem to be optimal in showing the recommended position of the apical electrode as recommended by Guidelines 2000. It is suggested that by showing a lateral view in the instructions, success in placing the apical electrodes correctly can be improved.

Adolescent↗

PubMed2005

Time matters; what is the time in your defibrillator? An observational study in 30 emergency medical service systems.

BACKGROUND: Measuring different intervals during cardiopulmonary resuscitation is a key element of resuscitation performance. For accurate time measurements, the internal clocks of automated external defibrillator (AEDs) need to be synchronized with the dispatch centre time. AIM: To determine the present practice of using and synchronizing the AED clocks in five regions in Finland. METHODS: During a single morning, the time of all AED clocks in the emergency medical service (EMS) systems of five large hospital districts were checked and compared with the dispatch centre time. A questionnaire about synchronisation policy and documentation of the first defibrillatory shock was also e-mailed to the local EMS medical supervisors. RESULTS: Eighty-eight AEDs were checked in 30 EMS systems. The mean deviation from dispatch centre time was 412 (+/-1001) s. There was no difference between EMS systems with (N = 7) or without (N = 23) written guidelines regarding synchronisation. Many EMSs reported that they document the time of the first shock without synchronisation of clocks. CONCLUSIONS: Synchronisation of AED clocks is not widespread in Finland. Instructions to synchronize have been issued in a minority of EMS systems. Despite this, time deviations are large, and erroneous times are recorded.

Cardiopulmonary Resuscitation↗

PubMed2004

Adherence to guidelines when positioning the defibrillation electrodes.

BACKGROUND: Placement of the defibrillation electrodes affects the transmyocardial current and thus the success of a defibrillation attempt. In the international guidelines 2000, the placement of the apical electrode was changed more laterally to the mid-axillary line. Finnish national guidelines, based on the international guidelines, were published in 2002. OBJECTIVES: The purpose of this study was to determine to what extent health care professionals adhere to the new guidelines when positioning the electrodes. METHODS: Professionals were recruited from emergency medical services, university hospitals and primary care. Not revealing the purpose of the test, participants were asked to place self-adhesive electrodes on a manikin as they would do in the resuscitation situation and to answer a questionnaire about resuscitation training and familiarity with the guidelines. The distance of electrodes from the recommended position was measured in horizontal and vertical planes. RESULTS: One-hundred and thirty six professionals participated in the study, and only 25.4% (95% CI 18.5-32.9) of them placed both electrodes within 5 cm from the recommended position. The majority of the participants placed the apical electrode too anteriorly. Of the participants, 36.0% were not aware of the new guidelines. Awareness of the guidelines did not increase the accuracy in electrode placement. CONCLUSIONS: The publication of the national evidence based resuscitation guidelines did not seem to have influenced the practice of placement of the defibrillation electrodes to any major extent. The correct placement of the electrodes needs be emphasized more in the resuscitation training.

Attitude of Health Personnel↗

PubMed2004

Preparedness for cardiopulmonary resuscitation in primary care.

OBJECTIVE: To evaluate preparedness for resuscitation of patients in cardiac arrest in primary care. DESIGN: Questionnaire study sent to every health centre in Finland (n = 277). SETTING: Primary care. MAIN OUTCOME MEASURES: Resuscitation training frequency and prevalence of automated external defibrillators and nurse-performed early defibrillation. RESULTS: One-hundred-and-forty-one health centres (51%) responded to the survey. Fifty-nine percent had appointed one person to be in charge of resuscitation training. The nurses in these health centres were trained to defibrillate (p < 0.001), physicians had advanced life support training (p < 0.001) and the first defibrillation was likely to be performed by a nurse on the ward (p < 0.01) more often. In 87% of health centres, it was not customary to defibrillate before the physician arrived beside the patient. Forty-four percent of the health centres used only manual defibrillators, 26% used automated external defibrillators and 30% used both. Only 18% of respondents considered resuscitation training in their health centre to be sufficient and systematic. CONCLUSION: Resuscitation training appears insufficient and non-systematic in most health centres in Finland. Automated external defibrillators are not in common use. In health centres with an appointed person in charge of resuscitation training, the training is more often regular.

Cardiopulmonary Resuscitation↗

PubMed2003

Public access defibrillation in Helsinki--costs and potential benefits from a community-based pilot study.

In cardiac arrest the interval between the collapse and defibrillation may be shortened by teaching lay people to use defibrillators. We conducted a 3-year prospective, community-based study on public access defibrillation (PAD) in an urban emergency medical services system. All public sites with a cardiac arrest incidence of at least one per year were equipped with automated external defibrillators. Twenty cardiac arrest patients were enrolled, seven in PAD and 13 in control group. Defibrillation was accomplished significantly earlier (P=0.01) in the PAD group. The direct costs were 110,270 Eur and only 13.5-16% of this figure would be related to the cost of defibrillators during their 8 years lifespan. This study showed that a community based model of PAD shortens the time to CPR and defibrillation significantly in an urban environment but various challenges have to be solved before wider implementation of PAD. In future projects the nature of the costs especially should be considered.

Aged↗