Skip to main content
Fig. 1 | BMC Pulmonary Medicine

Fig. 1

From: QTc prolongation is associated with severe desaturations in stroke patients with sleep apnea

Fig. 1

At first, the desaturation was detected, and the electrocardiography (ECG) signal samples were extracted based on the start and end times of each desaturation (A). The ECG signal was examined in three parts: 10-s pre-desaturation ECG sample, ECG sample within-desaturation, and 15-s post-desaturation ECG sample (B). The R-wave fiducial points were detected (C) and an average waveform for electrical activity was computed for each ECG sample in all three parts (D). The average QT times are measured for 10 s pre desaturation (QT1), within-desaturation (QT2), and 15 post-desaturation (QT3)

Back to article page