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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.
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.

When the leads of the electrocardiogram fall off, most often in the chest leads, the ECG waves in that lead may suddenly disappear. Do not misdiagnose this as cardiac arrest.
When the leads of the electrocardiogram fall off, most often in the chest leads, the ECG waves in that lead may suddenly disappear. Do not misdiagnose this as cardiac arrest.

The right chest lead is to place a chest lead electrode on the right chest, which is the mirror image of the left chest lead, and is used to explore the right ventricular electrocardiogram.
The right chest lead is to place a chest lead electrode on the right chest, which is the mirror image of the left chest lead, and is used to explore the right ventricular electrocardiogram.

The right chest lead is to place a chest lead electrode on the right chest, which is the mirror image of the left chest lead, and is used to explore the right ventricular electrocardiogram.
The right chest lead is to place a chest lead electrode on the right chest, which is the mirror image of the left chest lead, and is used to explore the right ventricular electrocardiogram.

Lead Ⅲ is a standard limb lead, with the positive pole placed in the left lower limb and the negative pole placed in the left upper limb.
Lead Ⅲ is a standard limb lead, with the positive pole placed in the left lower limb and the negative pole placed in the left upper limb.

When the leads of the electrocardiogram fall off, most often in the chest leads, the ECG waves in that lead may suddenly disappear. Do not misdiagnose this as cardiac arrest.
When the leads of the electrocardiogram fall off, most often in the chest leads, the ECG waves in that lead may suddenly disappear. Do not misdiagnose this as cardiac arrest.

Lead Ⅱ is a standard limb lead, with the positive pole placed in the left lower limb and the negative pole placed in the right upper limb.
Lead Ⅱ is a standard limb lead, with the positive pole placed in the left lower limb and the negative pole placed in the right upper limb.

The conduction system of the heart is responsible for the generation and conduction of cardiac electrical impulses, and is the electrical system of the heart.
The conduction system of the heart is responsible for the generation and conduction of cardiac electrical impulses, and is the electrical system of the heart.

Female, 71 years old, clinically diagnosed with coronary heart disease. The electrocardiogram shows severe sinus bradycardia, with symptoms of dizziness and a blood pressure of 80 and 40mmHg.
Female, 71 years old, clinically diagnosed with coronary heart disease. The electrocardiogram shows severe sinus bradycardia, with symptoms of dizziness and a blood pressure of 80 and 40mmHg.

During subendocardial myocardial ischemia, ischemia is confined to subendocardial myocardium, and the main changes of ECG are ST segment depression and T wave inversion.
During subendocardial myocardial ischemia, ischemia is confined to subendocardial myocardium, and the main changes of ECG are ST segment depression and T wave inversion.

In a wide QRS rhythm, the nature of the P wave can be observed in leads with lower QRS wave amplitudes. In this case, retrograde P waves can be seen in leads aVR and aVL.
In a wide QRS rhythm, the nature of the P wave can be observed in leads with lower QRS wave amplitudes. In this case, retrograde P waves can be seen in leads aVR and aVL.

When the QRS axis is at -22°, the main QRS wave is positive in lead aVL and negative in lead aVF, and the average potential is most parallel to the positive side of the aVL axis.
When the QRS axis is at -22°, the main QRS wave is positive in lead aVL and negative in lead aVF, and the average potential is most parallel to the positive side of the aVL axis.