Figure 1 ECG analysis:
basal heart rhythm is sinus rhythm .
R3 and R12 appear in advance, with a large deformity, and then has sinus P wave, is inserted into a basic heart rhythm cardiac cycle , has no compensation interval, which is insertion ventricular premature beat (also known as ventricular premature).
R8 and R10 appear in advance, with a large deformity, and then has sinus P wave, which is ventricular premature ventricular attack. If the sum of the joint interval and the compensatory interval is greater than the two cardiac cycles of the basic heart rhythm, and the compensatory interval is shorter than the two cardiac cycles of the basic heart rhythm, the supercompensatory interval is accompanied by the supercompensatory interval.
Figure 2 Electrocardiogram analysis:
Basal heart rhythm is sinus rhythm.
R4-R9 is paroxysmal atrial tachycardia with the starting point of atrial premature , with an atrioventricular conduction ratio of 1:1.
Figure 3 ECG analysis:
basal heart rhythm is sinus rhythm.
R2 and R9 are insertion ventricular premature beat (also known as metastatic premature).
Figure 4 EKG analysis:
basal heart rhythm is sinus rhythm.
R7 and R10 are insertion ventricular premature beats.
R3, R5 are ventricular premature beats, with complete compensatory intervals.
R12 appears in advance, and it is preceded by P'. It is different from sinus P. The morphology is 0.6s in the joint interval, the P'R interval is 0.12s in the P.R interval, and the QRS is supraventricular, accompanied by incomplete compensatory interval, indicating atrial premature beat .
Figure 5 ECG analysis:
basal heart rhythm is sinus rhythm.
R3, R11 is insertion ventricular premature beat
R6-R8 is paroxysmal atrial tachycardia with the atrioventricular conduction ratio of 1:1.
33 Related knowledge points:
1. Ventricular premature beat
originated from the pre-period contraction of the Hercules bundle below the bifurcation, which is called ventricular pre-period contraction , also known as ventricular pre-period contraction.
Except for ventricular septal premature beat, there is no relevant atrial wave before QRS (except for ventricular fusion wave).
General characteristics:
1, the QRS wave group time of which appears broad-minded deformity in advance is ≥0.12s, and the T wave is opposite to the main wave direction.
2, there is no relevant P wave before it, and there is occasionally P´ wave after it.
3, most of them are compensatory intermittent , and a few are insertable.
2. Compensation interval of ventricular premature beats
3 Measurement method for compensatory interval of ventricular premature beats, a period from the start of the QRS starting point of the preventricular premature stroke to the starting point of the QRS of the next basic cardiac beats. Measuring the sum of the joint intervals of ventricular premature beats plus the compensatory intervals and comparing them with the cycle of the basic heart rhythm can help understand the types of compensated intervals of ventricular premature beats, making differential diagnosis of certain arrhythmia , etc.
1, 3 uncompensated interval
3. The pre-ventricular contraction and insertion into a cardiac cycle with a basic rhythm is called uncompensated interval.
2, 3 times equal-period compensation interval
times equal-period compensation interval is between equal-period compensation and uncompensated interval. The electrocardiogram shows that the compensatory interval of ventricular premature beat is shorter than one basic cardiac cycle, while the compensatory interval plus compensatory interval is longer than one basic cardiac cycle.
3, , etc. cycle compensation interval
Any cardiac cycle after ventricular premature beat is equal to a basic heart rhythm is called equal cycle compensation interval.
4, Incomplete compensatory interval
Any compensatory interval is longer than the basic cardiac cycle, and the sum of the joint interval and the compensatory interval is less than the two basic cardiac cycles is called incomplete compensatory interval.
5, Complete compensatory interval
Anyone who has the sum of the joint interval and the compensatory interval is equal to twice the basic cardiac cycle, it is called complete compensatory interval. The reason is that this compensatory interval happens to completely compensate or compensate for the shortened joint interval. Most ventricular premature beats show complete compensatory intervals.
6, 3 hypercomplete compensatory interval
Anyone who has the sum of the joint interval and the compensatory interval is greater than the two cardiac cycles of the basic heart rhythm, and the compensatory interval is shorter than the two cardiac cycles of the basic heart rhythm, is called supercompensatory interval.
7, 3 Special supercompensated interval
Anyone who has two cardiac cycles whose compensatory interval is greater than the basic heart rhythm after premature beats is called special supercompensated interval. Features of the compensatory interval of delayed
8, delayed compensatory interval of delayed
delayed compensatory interval: insertional prevention of ventricular contraction causes the first sinus P-R interval to be significantly prolonged, and the second sinus P wave is conduction interrupted due to falling into the previous heartbeat, and the QRS wave group is leaked. Deferred compensation intervals are relatively rare.
