心电基本知识（Basic knowledge of ECG）.docVIP

心电基本知识（Basic knowledge of ECG） Basic knowledge of ECG wave group consisting of: P wave: reflect potential changes in the atrium. QRS wave: reflect potential changes in ventricular pole. T wave: potential changes represent myocardial repolarization. P R: in addition to atrial ventricular interval represents extreme depolarization beginning time. Q - T: QRS complexes from the starting point to the end point of T wave time. S T: from QRS wave to T wave starting point line end point. Heart rate measurement 60 / P-P (or R-R) time interval 1500 / P-P (or R-R) small number Normal ECG waveform The normal ECG waveform in I, II, aVF, V4-V6 lead QRS main wave direction. AVR V1 V2, the downward main wave. (a) P wave The direction of lead aVR inversion, I, II, aVF and V3-V6 leads are upright; If I and II, P wave in lead aVF inversion in lead aVR erect, known as retrograde P wave, often expressed excitement originated in the atrioventricular junction area. (two) P-R interval The normal range of P-R interval is 0.12-0.20s. Too long, said atrioventricular block. (three) QRS wave group The 1. time 0.06-0.10s, not more than 0.11s. (wide) in prolonged ventricular hypertrophy, ventricular beat and intraventricular block. 2. waveform and amplitude Chest leads: Rv1-Rv5 gradually increased, while the S wave decreased gradually, V1, lead V2 is rS. Analysis of arrhythmia A note, waveform 1. ECG waveform can be divided into general QRS supraventricular waveform and waveform. Supraventricular waveform normal ventricular waveform malformation. Room 2. on the fluctuation can have sinus wave fluctuations and real fluctuation wave and borderline wave wave, the wave form basically normal. Room 3. of indoor fluctuation waveform can be ectopic pacing and ventricular block waveform waveform Two, to find out the dominant rhythm 1, according to the P wave to determine the direction of sinus rhythm or junctional rhythm. Sinus P direction should be upward, I and II aVF, lead V4~V6 upright, inverted PavR.