RSS 1.0Accident and Emergency
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Diagnostic accuracy of the Troponin-only Manchester Acute Coronary Syndromes (T-MACS) decision aid with a point-of-care cardiac troponin assayObjective: Point-of-care (POC) cardiac troponin (cTn) assays have a rapid turnaround time but are generally less sensitive than laboratory-based assays. Previous research found that the Abbott i-Stat cardiac troponin I (cTnI) assay has good diagnostic accuracy when used with the Troponin-only Manchester Acute Coronary Syndromes (T-MACS) decision aid and serial sampling over 3 hours. Accuracy of other assays may differ. We therefore evaluated the diagnostic accuracy of a different POC cTnI assay with serial sampling over 3 hours, both with T-MACS and when used alone. Methods: In a prospective diagnostic accuracy study at eight EDs in England (July 2015-October 2017), we collected clinical data from consenting adults with suspected ACS at the time of assessment in the ED. Blood samples were drawn on arrival and 3 hours later for POC cTnI (Cardio 3 Triage, Alere). The target condition was an adjudicated diagnosis of acute myocardial infarction (AMI), based on reference standard serial laboratory-based cTn testing. We calculated test characteristics for POC cTnI using the limit of detection (LoD, 0.01 µg/L) and the T-MACS decision aid. Results: Of 347 participants, 59 (14.9%) had AMI. With serial POC cTnI testing over 3 hours, POC cTnI at the LoD cut-off ruled out AMI in 193 (55.6%) patients with 98.1% sensitivity (95% CI 89.9% to 100.0%) and 99.5% negative predictive value (NPV, 95% CI 96.5% to 99.9%). T-MACS ruled out AMI in 117 (33.7%) patients with 98.1% sensitivity (95% CI 89.9% to 100%) and 99.2% NPV (95% CI 94.3% to 99.9%). T-MACS ruled in AMI with 97.9% specificity (95% CI 95.8% to 99.5%) and 83.7% positive predictive value (95% CI 70.6% to 91.7%). Conclusions: With serial sampling over 3 hours, the Alere Cardio 3 Triage cTnI assay has relatively high NPV for AMI using either the LoD cut-off alone or the T-MACS decision aid. However, wide CIs around the measures of diagnostic accuracy mean that further prospective testing of this strategy is required before clinical implementation. Trial registration number: UKCRN 18000. Keywords: acute coronary syndrome; acute myocardial infarct.
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Recognition and management of button battery ingestion amongst emergency practitionersIntroduction Button battery ingestion (BBI) carries a significant risk of morbidity and mortality. We conducted a regional analysis following an NHS England national patient safety alert to evaluate the knowledge base in the emergency management of BBI amongst emergency practitioners. Methods A ten-point questionnaire was distributed electronically and in hardcopy formats to emergency departments across 15 hospitals within the West Midlands, United Kingdom. The questionnaire assessed participants' knowledge of emergency management of BBI. The effect of clinician grade and previous otorhinolaryngology experience on knowledge scores was evaluated. Results A total of 176 responses were received from 11 hospitals. A small proportion (18%) were aware of a local department protocol. The majority of participants (70%) routinely screened for a button battery in their history taking. Our findings highlighted a lack of awareness of the timeframe for mucosal injury, potential complications, radiological signs, and the necessity for immediate retrieval. The median knowledge score was 18.8% (IQR=12.5-31.3%). Both registrars and consultants scored the highest (median 25%). Previous otorhinolaryngology experience was associated with a higher median score (P=0.002). Conclusion Our multi-center regional emergency medicine analysis demonstrated knowledge deficiency in the initial assessment and management of BBI. A high index of suspicion for button battery ingestion is needed. In view of the time-critical nature of button battery impaction in the esophagus, a "golden hour" concept should be integrated into acute management pathways with the early involvement of otorhinolaryngologists.
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Cardiac arrest in the ICU: measuring performance to drive improvements in careAn editorial on measuring performance to drive improvements in the care of patients following cardiac arrest in the ICU.
