The distance from the sternum should be used to judge the relative voiced boundary of the normal heart: right cm, intercostal left cm, 2-3 II 2-3 II 3.5-4.53-4 IV 5-6 V 7-9, which is only a relative normal value, and it is the average value obtained by the survey population. It does not mean that all people can't determine the size of the heart boundary only by percussion sometimes, so it is necessary to have a heart over-level examination.

The boundary of the heart

1. Normal apical pulsation is located at the left clavicular midline of the fifth intercostal, 0.5 ~ 1.0 cm, and the pulsation range is about 2.0 ~ 2.5 cm in diameter.

2. The relative voiced boundary of normal heart determined by percussion method is (the left clavicle midline is 8~l0cm away from the sternum midline).

Right boundary between ribs (cm) and left boundary (cm)

2-3II 2-3

2-3III3.5-4.5

3-4 4 5-6

V. 7-9

References:

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