Fully automatic external defibrillators in acute care: Clinicians' experiences and perceptions

Diagnostic accuracy and usability of the EMBalance decision support system for vestibular disorders in primary care: proof of concept randomised controlled study results

BACKGROUND

Dizziness and imbalance are common symptoms that are often inadequately diagnosed or managed, due to a lack of dedicated specialists. Decision Support Systems (DSS) may support first-line physicians to diagnose and manage these patients based on personalised data.

AIM

To examine the diagnostic accuracy and application of the EMBalance DSS for diagnosis and management of common vestibular disorders in primary care.

METHODS

Patients with persistent dizziness were recruited from primary care in Germany, Greece, Belgium and the UK and randomised to primary care clinicians assessing the patients with (+ DSS) versus assessment without (- DSS) the EMBalance DSS. Subsequently, specialists in neuro-otology/audiovestibular medicine performed clinical evaluation of each patient in a blinded way to provide the "gold standard" against which the + DSS, - DSS and the DSS as a standalone tool (i.e. without the final decision made by the clinician) were validated.

RESULTS

One hundred ninety-four participants (age range 25-85, mean = 57.7, SD = 16.7 years) were assigned to the + DSS (N = 100) and to the - DSS group (N = 94). The diagnosis suggested by the + DSS primary care physician agreed with the expert diagnosis in 54%, compared to 41.5% of cases in the - DSS group (odds ratio 1.35). Similar positive trends were observed for management and further referral in the + DSS vs. the - DSS group. The standalone DSS had better diagnostic and management accuracy than the + DSS group.

CONCLUSION

There were trends for improved vestibular diagnosis and management when using the EMBalance DSS. The tool requires further development to improve its diagnostic accuracy, but holds promise for timely and effective diagnosis and management of dizzy patients in primary care.

TRIAL REGISTRATION NUMBER

NCT02704819 (clinicaltrials.gov).

'It is not going to change his life but it has picked him up': a qualitative study of perspectives on long term oxygen therapy for people with chronic obstructive pulmonary disease

Background

Long-term oxygen therapy (LTOT) extends life in patients with chronic obstructive pulmonary disease with severe hypoxaemia. Questionnaire-based studies of the effects of LTOT have not suggested uniformly positive findings. The few qualitative studies suggest that patients report benefits but also concerns about dependency on oxygen therapy. The aim of the study was to explore the views and experiences of COPD patients, their carers and the healthcare professionals who deliver these services, on the long-term use of oxygen therapy.

Methods

Focus groups were conducted with 16 patients with from the LTOT service, six carers, and nine healthcare professionals (n = 31). Eleven patients with COPD, four carers and one staff manager (n = 16) participated in semi-structured interviews. Interviews and focus group were digitally recorded and field notes were taken. Data were analysed using the thematic network analysis approach.

Results

Patients and carers reported the benefits of LTOT including increased social activity, perceived improvements in health status and self-management in routine daily activities. Concerns were raised regarding stigma, dependency on LTOT and deterioration in health status. Staff accounts included negative perceptions, suggesting that LTOT was often inappropriately prescribed and under-used but recommended active patient management to address this challenge.

Conclusions

LTOT has some beneficial effects in improving daily activities and social interaction of patients with COPD but also some limitations. Increased support and monitoring by healthcare professionals would address some concerns, as would better information for patients, carers and the general public.

"Everything was spiraling out of control": experiences of anxiety in people with chronic obstructive pulmonary disease

OBJECTIVE

This study sought to elicit and describe the first-hand experiences of anxiety in community patients with stable chronic obstructive pulmonary disease (COPD). Anxiety is common among patients with COPD. Clinical anxiety affects up to two thirds of patients, leading to reduced quality of life and physical functioning. There has been little research exploring the experiences of anxiety in patients with COPD, particularly in individuals with stable respiratory symptoms.

METHODS

We interviewed 14 community patients with stable COPD and self-reported symptoms of anxiety. Data were analyzed using thematic network analysis to develop basic, organizing, and global themes.

RESULTS

Patients reported intense thoughts of fear, hopelessness, and confusion that were associated with the anxiety and panic attacks. Self-management was important, particularly self-talk coping strategies.

CONCLUSIONS

Unmanaged anxiety seems to be particularly distressing for patients with COPD. Self-management strategies can be highly effective in preventing and managing anxiety.

Defibrillation and resuscitation in a piglet model of pediatric ventricular fibrillation following AHA 2005 guidelines

OBJECTIVE

To evaluate the efficacy and safety of defibrillation on children according to AHA 2005 recommendations

METHODS

Pig resembles human in the chest configuration, anatomy and physiology of the cardiovascular and pulmonary systems. Piglets weighing 7.0 Kg ± 1.4kg, 14.0kg ± 2.8kg, 25.0kg ± 5.0kg respectively, which represented children 1 to 8 yr old were induced ventricular fibrillation (VF). An adult biphasic AED was used in conjunction with pediatric attenuating electrodes which could deliver 50-J shock for 2 min and two min of cardiopulmonary resuscitation (CPR) immediately followed it. If VF did not reverse, 70-J shock combined with CPR was used, and the protocol was repeated five times. If an organized cardiac rhythm with mean aortic pressure more than 60 mmHg persisted for an interval of 5 minutes, the animal was regarded as successfully resuscitated. If the AED recognized a "non-shockable" rhythm, CPR was also performed immediately for 2 min. The same resuscitation program was exercised on piglets of manual defibrillator group. Neurologic alertness score, hemodynamic and myocardial functions were evaluated, autopsy was routinely performed to document possible injuries.

RESULTS

In the AED group, 14 out of 15 animals, were successfully resuscitated, among them 11 piglets were resuscitated by 50-J defibrillation combined with cardiopulmonary resuscitation, and other three recovered to normal by 1 or 2 times of 70-J shocks and CPR. All animals in manual defibrillator group were successfully resuscitated by 50-J shocks and CPR. Left ventricular ejection fraction and fractional area change were reduced significantly during 3-4 hr post-resuscitation (P<0.05) and returned to baseline ranges at the end of 72 hr. There was no evidence of myocardial and pulmonary damage during autopsy, and neurologic recovery was also normal. Data of blood gas analysis, blood electrolytes and myocardial enzymes does not show any statistically significant difference (P> 0.05) in the groups. 50 J biphasic dose defibrillation combined with effective CPR, successfully terminated VF without adverse effects on myocardial function and survival in a piglet defibrillation model for young children 1 to 8 yr of age.

CONCLUSIONS

The new guidelines recommendation that one shock immediately followed by CPR is reasonable. Adults AED combined with pediatric electrodes is feasible to the diagnosis and treatment of pediatric VF model. But the user should not rely too much on AED's "automatic" function, but should accumulate and integrate his experience with AED technology.