Yesterday, a  mother to do an ECG and found that PR interval prolongation> 0.20 seconds. But that basic ECG screen is pure white, can not see the dynamic process of ECG, only random print.

　　To break out of only two records of heart rate, while the old man said a cardiac arrest situation. So I would like to pull a long lead, take a look at the situation of AV block, the old man said that once before, but now stop Bo and normal QRS waveform.

　　Do not know type Ⅰsecond time, that is, Wenckebach phenomenon? PR interval gradually extended until the P wave and the ventricular obstruction hiatus, but the ECG has never grasp the lacuna of the QRS wave.

　　Taking advantage of the opportunity, ring sokdam also under serious study AVB ECG situation.

　　First, once atrioventricular block: ① P-R interval> 0.20 seconds, ② after each P wave, QRS wave group were. 2, second degree atrioventricular block: some atrial ventricular not spread, some P waves without QRS wave after the group, the ratio may be 2:1 atrioventricular conduction; 3:2; 4:3 ... .... Second degree atrioventricular block can be divided into two types. Wenckebach phenomenon known as type Ⅰ, or Morse type Ⅰ, Ⅱ type known as Mohs Ⅱ.

　　(A) of the second type Ⅰ block - Man's phenomenon ① P-R interval gradually extended until the P wave and the ventricular obstruction hiatus, ② R-R interval gradually shortened until the P wave blocked; ③ contains blocked P waves R-R interval P-P ratio of between two and for a short period of.

　　(B) Second degree atrioventricular block type Ⅱ Morse type Ⅱ ① P-R interval fixed, regular or extended. ② QRS wave group with period of hiatus between, block level changes can often be 1:1; 2:1; 3:1; 3:2; 4:3 and so on. Downstream of the QRS wave group often isolated bundle branch block graphics.

　　First degree and second degree AV block type Ⅰ, multi-block area in the atrioventricular node, the QRS wave group is not widened; second-degree AV block type Ⅱ, many parts of the block in the His beam below, then often widened QRS wave group.

　　(C) of the complete atrioventricular block (third degree atrioventricular block): ① P wave and QRS wave group has nothing to do with each other; ② atrial rate faster than ventricular rate, atrial rhythm may be sinus or ectopic origin; ③ from the junction of ventricular arrhythmia or ventricular pacemaker to maintain independence.

　　QRS wave group shape depends on the site of block, such as bundle branch block is located above the Ocean pacemaker stroke is caused by atrioventricular junction and ventricular peak appears close to the bifurcation of spontaneous cardiac rhythm, QRS wave group is not broadening. Such as in the double-bundle branch block, while for the low ventricular escape rhythm of spontaneous cardiac rhythm, QRS wave group widened or deformity. High near atrioventricular junction escape rhythm rate of 40-60 times per minute, often in between, and low ventricular rate of spontaneous cardiac rhythm more than 30-50 times per minute in between.