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Diagnostic accuracy of an automatic blood pressure device for ankle brachial index determination in ischemic stroke patients

J.J. Arévalo-Manso, B. Juárez-Martín, G. Fernández-Rodríguez, P. Martínez-Sánchez, P. Parrilla-Novo, E. Pérez-Fernández, B. Fuentes [REV NEUROL 2012;55:129-136] PMID: 22825973 DOI: https://doi.org/10.33588/rn.5503.2011679

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Volumen 55 | Number 03 | Nº of views of the article 4.929 | Nº of PDF downloads 515 | Article publication date 01/08/2012

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ABSTRACT

INTRODUCTION Ankle brachial index (ABI) is not widespread in clinical practice because the need for specific equipment and training. Doing it without these requirements, quicker and with a cheaper method would facilitate their routine use. AIMS. To evaluate sensitivity and specificity of an automatic blood pressure device detecting ABI < 0.90, when technique is performed by nurses. To evaluate agreement between two techniques for the ABI determination.

PATIENTS AND METHODS Diagnostic accuracy study in 30 ischemic stroke patients. For each patient, three measurements were performed with the automatic device, and one with the reference method.

RESULTS The automatic blood pressure device performance detecting ABI < 0.90 was acceptable for each of the three measurements (sensitivity: 78%, 87% and 100%; specificity: 95%, 100% and 100%; positive predictive value: 87%, 100% and 100%; negative predictive value: 91%, 96% y 100%; accuracy: 90%, 97% y 100%). The intraclass correlation coefficients for intra-observer, inter-observer and inter-method variability showed acceptable levels, with results of 0.64, 0.83 and 0.75, respectively. In the Bland Altman test only inter-method comparison had less than 5% of its values out of range.

CONCLUSIONS Sensitivity and specificity of an automatic blood pressure device detecting ABI < 0.90 shows acceptable levels when technique is performed by nurses. This suggests its potential as screening tool in transient ischemic attack/ischemic stroke patients. KeywordsAnkle brachial index Brain infarction Oscillometry Peripheral arterial disease Sensitivity Specificity Transient ischemic attack Ultrasonography Doppler CategoriesPatología vascular

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Diagnostic accuracy of an automatic blood pressure device for ankle brachial index determination in ischemic stroke patients

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