LA is left up, location: first intercostal space in the left midclavicular line.
LL is sitting down, location: left midclavicular line flat raphe.
PS: The raphe is the lowermost part of the sternum.
The 5-lead electrocardiographic monitoring electrode sheet should be affixed to the left anterior axillary line of the 5th intercostal space. avR, avL, avF, V1, V2, V3, V4, V5, and V6 leads are unipolar leads, and a unipolar lead is constituted between the electrode and the central potential end, whereby the probe electrode is the positive electrode, and the central potential end is the negative electrode.
The heart is a three-dimensional structure, and in order to respond to the electrical activity of different sides of the heart, electrodes are placed in different parts of the body to record and respond to the electrical activity of the heart. During a routine electrocardiogram, only four limb lead electrodes and V1 to V66 chest lead electrodes are usually placed to record a routine 12-lead electrocardiogram.
Expanded Information:
Applications of the electrocardiogram:
1. Recording the body's normal electrical activity of the heart.
2, To help diagnose cardiac arrhythmias.
3, help diagnose myocardial ischemia, myocardial infarction and site.
4, Diagnose heart enlargement and hypertrophy.
5, Determine the effect of drugs or electrolyte conditions on the heart.
6, determine the status of artificial heart pacing.