Teach you to understand the normal value of ECG and recording paper

Time : 2022-11-16

How to understand the ECG recording paper? The ECG recording paper is a method of reflecting the results of the ECG examination, so it is very important. Today, I will teach you to understand the normal value of ECG and the recording paper. Come and learn two tricks together.

How to understand the normal value of ECG

Each small grid on the ECG chart is 0.04s.

Heart rate: normal sinus rhythm is between 60 and 100bpm*, over 100bpm is sinus tachycardia, and under 60bpm is sinus bradycardia. arrhythmia

Heart rhythm: Healthy people have normal sinus rhythm most of the time, and occasional premature beats (see Chapter 12) are not abnormal. the valley

(P wave: In the limb leads, except for aVR which is inverted, the rest of the leads are mostly upright, or relatively flat. Most of the chest wall leads V1-6 are not obvious enough to be upright

PR interval: The normal range of time from the start of P wave to the start of QRS complex is 0.12-020s.

QRS complex: it is a narrow and diverse (qR, Rs rS or qRs) complex with a time within the narrow range of 0.06 to 0.10s

ST segment: It is a section from the J point of QRS to the beginning of _r wave. The normal shape is upright and shallow with the T wave. Parallel depression of sT segment or oblique F depression is abnormal, and mild elevation can be seen in normal people. It should be combined with clinical conditions to judge whether it is normal or not.

T wave; except that the aVR lead is inverted, the rest should be upright when the R wave is higher than 0.5mV. (For example, the I and II leads should be upright in aVR, and the chest leads should be upright from V4-6).

The small crossing after U crossing T wave is easy to see in V2-3, it should be upright normally, other leads may not be obvious

Q-T interval: the interval from the beginning of the qRS wave to the end of the T wave. The Q-T interval varies slightly with the heart rate, but the prolongation of the Q-T interval that does not match the heart rate has a more important significance. Abnormal shortening is mostly caused by drugs or electrolyte disturbances.

Then, what about the recording paper of the electrocardiogram?

The meaning of ECG recording paper

Electrogram recording paper. The electrocardiogram is recorded on paper covered with squares, so if you want to know how the electrocardiogram looks, the first thing is to know the meaning of these squares. In these grids, each thin vertical line is 1 mm apart, and each thin horizontal line is also 1 mm apart, and they form a small grid of 1 mm square. Thick lines are one for every five small grids, and the distance between each thick line is 5mm, and the horizontal and vertical thick lines form a large square. The electrocardiogram recording paper moves according to the international standard speed, the moving speed is 25mm/s, that is to say, each small grid in the horizontal direction represents 0.04s; the distance between every two thick lines represents 0.2s. There are also international regulations on the applied voltage when recording the ECG, that is, when the voltage of 1mV is applied, the baseline should be accurately raised by 10 small divisions, that is to say, each small horizontal division represents 0.1mV, and each large division It means 0.5mV, and every two large grids represent this 1mV.

After the ECG results come out, they should be brought to the doctor in time.

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