How to do an electrocardiogram

The electrocardiogram refers to the successive excitation of the pacemaker, atrium, and ventricle of the heart in each cardiac cycle, accompanied by

Changes in physical electricity, through electrocardiogram, the tracer draws out various forms of potential changes from the body surface

So how do you make an electrocardiogram?

1. Preparation before operation
The room temperature is suitable, 18~26℃, to avoid EMG interference caused by cold. Take a comfortable supine position, the pillow should not be too high. Remove interfering devices, such as watches. Protect patient privacy and eliminate tension. Make sure the ECG machine is in working condition and the ECG chart is sufficient.

2. Make sure the electrode position is correct
The limb leads of the ECG are clamped on the left wrist, right wrist, left ankle, and right ankle, respectively. They should not be placed on the arm or calf, but should be placed on a flat and fleshy part. The limb lead electrodes are equidistant from the heart, placing the electrodes in the same location on each limb. If the limb part cannot be placed (eg, amputation, injury), the electrodes can be placed closer to the torso. The chest leads V4, V5, and V6 should be at the same level. If the position of V5 is difficult to determine, place V4 and V6 in the middle of the same level; V7, V8, and V9 should also be at the same level as V4. Women with sagging breasts should hold up their breasts, and place the V3 and V4 electrodes on the chest wall at the lower edge of the breast, not on the breast. The mastectomy should indicate that when V7, V8, and V9 are traced, the supine position must be taken, and no Should lie on the side or other body mapping. Do not place the electrodes of the left and right lower extremities on one lower extremity. The synchronous 12-lead electrocardiograph is equipped with a right lower extremity anti-drive circuit, which can effectively suppress AC interference. (2)

3. Observe the rise and fall of the patient's chest. If the rise and fall will affect the ECG waveform, the patient can be instructed to take a deep breath and then hold it.

4. Routinely give alcohol degreasing to enhance conductivity
High-quality ECG is the basis for correct diagnosis, and mastering the above skills can improve the quality of ECG. In addition, it is necessary to pay attention to the dynamic evolution of the electrocardiogram in combination with the clinical symptoms of the patient.