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Published on: February 26, 2013
Simplified electrocardiogram sampling maintains high diagnostic capability for atrial fibrillation: implications for
Jane C Caldwell1, Zoltan Borbas, Andrea Donald
1Manchester Heart Centre, Central Manchester University Foundation NHS Trust, Oxford Road, Manchester M13 9WL, UK.
Insights
A new hand-held device offers a rapid and accurate way to screen for atrial fibrillation (AF) in primary care. This 6-lead ECG method reliably detects AF, even with lower tracing quality compared to traditional methods.
Area of Science:
- Cardiology
- Medical Devices
- Public Health
Background:
- Atrial fibrillation (AF) is a significant contributor to cardiovascular morbidity, mortality, and healthcare costs.
- Current screening methods for AF, like conventional electrocardiograms (ECG), are often impractical for opportunistic screening in primary care settings.
- There is a need for rapid, accurate, and accessible screening tools to detect AF, especially in asymptomatic individuals.
Purpose of the Study:
- To evaluate a prototype hand-held electrode assembly for acquiring a 6-lead frontal-plane ECG.
- To determine if this prototype could accurately detect AF in seated, clothed patients compared to the gold standard 12-lead ECG.
- To assess the diagnostic performance and tracing quality of the prototype device.
Main Methods:
- Electrocardiograms were recorded from 157 patients (78 with AF, 79 with sinus rhythm) using four methods: conventional 12-lead ECG, 6-lead limb ECG, supine prototype ECG, and seated prototype ECG.
- Recordings were blindly assessed by two cardiologists for AF diagnosis and tracing quality (good, adequate, bad).
- Diagnostic accuracy metrics including sensitivity, specificity, and positive/negative predictive values were calculated.
Main Results:
- All tested methods demonstrated high diagnostic performance for AF detection compared to conventional 12-lead ECG.
- Sensitivities ranged from 90-99%, specificities from 94-100%, and accuracies from 93-99% across the new methods.
- While the prototype device, particularly in the seated position, yielded lower tracing quality (19-41% good) than the conventional 12-lead ECG (71-80% good), it still allowed reliable AF differentiation.
Conclusions:
- A simple, hand-held 6-lead ECG device can reliably differentiate atrial fibrillation from sinus rhythm.
- Despite suboptimal electrocardiographic quality, the prototype shows promise for opportunistic AF screening in primary care.
- This technology addresses the need for a more practical and accessible screening tool for widespread AF detection.
Aims:
Atrial fibrillation (AF) is a major cause of morbidity, mortality, and health resource consumption. However, as many patients with chronic AF are asymptomatic, rapid, accurate opportunistic screening is needed in primary care to detect AF. Conventional electrocardiogram (ECG) technology is too clumsy and time consuming for mass opportunistic screening, thus technology that allows easy, rapid, yet accurate AF screening is required. To address this requirement a prototype hand-held electrode assembly was developed. We hypothesized that a 6-lead frontal-plane ECG acquired from this apparatus in a seated, clothed patient would be as accurate at detecting AF as conventional 12-lead ECG in the undressed, supine patient (the 'gold standard').
Methods And Results:
Electrocardiograms were obtained from 78 patients with AF and 79 with sinus rhythm (SR). All had a conventional 12-lead ECG, a 6-lead ECG from conventionally positioned limb electrodes, a supine 6-lead recording using the prototype recorder placed on the lower thorax/upper abdomen, and a 6-lead prototype recording in the seated patient, the latter with loosened clothing only. Electrocardiograms were randomly and blindly assessed by two cardiologists for (i) diagnosis of AF vs. SR and (ii) tracing quality (subjectively assessed as good, adequate, or bad). Compared with conventional 12-lead ECG recordings, all 'new' recording methods performed satisfactorily with sensitivities ≥90% (90-99%), specificities ≥94% (94-100%), positive predictive values ≥94% (94-100%), negative predictive values ≥90% (90-99%), and accuracies ≥93% (93-99%). Tracing quality was higher in conventional 12-lead recordings (71 and 80% were assessed as good by the two observers) compared with conventional 6-lead (57 and 59%), supine prototype (41 and 31%), and sitting prototype (39 and 19%).
Conclusions:
Despite inferior electrocardiographic quality a 6-lead frontal plane ECG acquired by a simple prototype hand-held electrode assembly allowed reliable differentiation of AF from SR compared with standard 12-lead ECG.
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