Motion and Noise Artifact-Resilient Atrial Fibrillation Detection Using a Smartphone

Jo Woon Chong, Chae Ho Cho, Fatemehsadat Tabei, Duy Le-Anh, Nada Esa, David D. McManus, Ki H. Chon

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We have recently found that our previously-developed atrial fibrillation (AF) detection algorithm for smartphones can give false positives when subjects' fingers or hands move, as we rely on proper finger placement over the smartphone camera to collect the signal of interest. Specifically, smartphone camera pulsatile signals that are obtained from normal sinus rhythm (NSR) subjects but are corrupted by motion and noise artifacts (MNAs) are frequently detected as AF. AF and motion-corrupted episodes have the similar characteristic that pulse-to-pulse intervals are irregular. We have developed an MNA-resilient smartphone-based AF detection algorithm that first discriminates and eliminates MNA-corrupted episodes in smartphone camera recordings, and then detects AF in MNA-free recordings. We found that MNA-corrupted episodes have highly varying pulse slope, large turning point ratio, or large kurtosis values in smartphone signals compared to MNA-free AF and NSR episodes. We first use these three metrics for MNA discrimination and exclusion. Then, AF is detected in MNA-free signals using our previous algorithm. The capability to discriminate MNAs and AFs separately in smartphone signals increases the specificity of AF detection. To evaluate the performance of the proposed MNA-resilient AF algorithm, 99 subjects, including 88 study participants with AF at baseline and in NSR after electrical cardioversion as well as 11 participants with MNA-corrupted NSR, were recruited. Using iPhone 4S, 5S, and 6S models, we collected 2-min pulsatile time series from each subject. The clinical results show that the accuracy, sensitivity, and specificity of the proposed AF algorithm are 0.97, 0.98, and 0.97, respectively, which are higher than those of the previous AF algorithm.

Original languageEnglish
Pages (from-to)230-239
Number of pages10
JournalIEEE Journal on Emerging and Selected Topics in Circuits and Systems
Volume8
Issue number2
DOIs
StatePublished - Jun 2018

Keywords

  • Atrial fibrillation
  • Shannon entropy
  • motion and noise artifact
  • root mean square of successive RR differences (RMSSD)
  • support vector machine (SVM)

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