Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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The electrocardiogram (ECG), introduced into clinical practice more than 100years ago by Einthoven, constitutes a lineal recording of the heart’s electricalactivity that occurs successively over time. An atrial depolarisation wave (Pwave), a ventricular depolarisation wave (QRS complex) and a ventricularrepolarisation wave (T wave) are successively recorded for each cardiac cycle(Figures 1A–C). As these different waves are recorded from different sites(leads) the morphology varies (Figure 2).Nevertheless, the sequence is alwaysP–QRS–T. An ECG curve recorded from an electrode facing the left ventricle isshown in Figure 1D. Depending on the heart rate, the interval between wavesof one cycle and another is variable....
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Basic Electrocardiography - NORMAL AND ABNORMAL ECG PATTERNS
