I.Sinus Rhythms and Sinus Arrhythmias 1.ECG of Sinus Rhythms Sinus rhythm must originate in the sino-atrial node. 1).Regularly recurring sequences of P waves, QRS complexes,and T waves.P-P or R-R interval establishes a specific interval which should not vary more than 0.12 second
I.Sinus Rhythms and Sinus Arrhythmias ◼ 1.ECG of Sinus Rhythms Sinus rhythm must originate in the sino-atrial node. 1).Regularly recurring sequences of P waves, QRS complexes,and T waves.P-P or R-R interval establishes a specific interval which should not vary more than 0.12 second
I.Sinus Rhythms and Sinus Arrhythmias 2).The P wave is upward in lead I,II,avFV4-5 and downward in lead avR. 3).The PR interval>0.12 second. 4).Heart rate between 60 and 100 rates per minute
I.Sinus Rhythms and Sinus Arrhythmias ◼ 2).The P wave is upward in lead I,II, avF,V4-5 and downward in lead avR. 3).The PR interval>0.12 second. 4).Heart rate between 60 and 100 rates per minute
aVR 图3-3正常心电图
I.Sinus Rhythms and Sinus Arrhythmias ■2.Sinus Tachycardia 1).1).2).and3) 2).Heart rate exceeding 100 per minute
I.Sinus Rhythms and Sinus Arrhythmias ◼ 2. Sinus Tachycardia 1). 1).2).and 3) 2).Heart rate exceeding 100 per minute
Factors associated with Sinus Tachycardia: Physiologic Exercise Strong emotion Pain Anxiety states
◼ Factors associated with Sinus Tachycardia: Physiologic Exercise Strong emotion Pain Anxiety states