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In the third degree atrioventricular block, P wave has nothing to do with QRS wave, and can randomly overlap in different positions of QRS-T wave.

adams-stokes syndrome

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In some well-trained individuals, such as heavy laborers, athletes, etc., ECG may show significant sinus bradycardia, which does not indicate abnormal sinus node function.

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ischemic heart disease, myocardial infarction, sudden death, ventricular tachycardia, ventricular fibrillation, amaurosis, syncope, shock, palpitations, chest pain, angina, dyspnea, coronary arteries,

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Although the diagnostic criteria of sinus pause defined by ESC and AHA are greater than or equal to 2S and 3S, respectively, some exceptions sometimes occur.

anesthetic accidents

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When the pacemaker cells of sinoatrial node are diseased, they will stop producing action potential, form sinus pause, and have a long P-P interval in ECG.

action potential

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In the third degree of atrioventricular block, the PR interval variation was irregular. In the second degree of type I atrioventricular block, the PR interval changes periodically.

adams-stokes syndrome

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When sinus arrest or third degree sinoatrial block occurs, the timely appearance of escape beats or escape rhythms can prevent excessively slow ventricular rates and avoid amaurosis or syncope.

atrioventricular junction

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When the long P-P interval is an integral multiple of the basic sinus P-P interval, it is sinoatrial block. When it is more than 2 times, it is a high sinus block.

action potentials

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When sinus pause occurs, timely escape or escape rhythm can avoid ventricular rate from being too slow, and avoid amaurosis or syncope.

atrioventricular junction

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Bradycardia mainly includes sinus node lesion, atrioventricular block or both, with slow ventricular rate and even transient ventricular arrest.

atrioventricular block

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Only one of every two impulses generated by sinoatrial node can be transmitted to atrium, resulting in sinus P wave, and the other one is blocked, which is called 2:1 sinoatrial block.

action potential

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In high degree AV block, more than 2 consecutive P waves fail to descend to the ventricles, including the AV node or subnodal block. Patients are prone to fainting.

absolute refractory period

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When malignant arrhythmias cause a sudden decrease in cardiac output, the patient will experience symptoms such as amaurosis, syncope, and convulsions, which is called Adams-Stokes syndrome.

adams-stokes syndrome

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In atrioventricular block, the difference between P-P interval with QRS wave and P-P interval without QRS wave is more than 30ms, which can diagnose ventriculophasic sinus arrhythmia.

2:1 atrioventricular block

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In the third degree atrioventricular block, P wave has nothing to do with QRS wave, showing PR interval without fixed interval, and P wave overlaps in different positions of QRS-T wave.

adams-stokes syndrome

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In third-degree atrioventricular block, all sinus P waves cannot be transmitted down to the ventricles, and the ventricular rhythm is controlled by the escape rhythm.

adams-stokes syndrome

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