Dull voice: It is the percussion sound of normal lungs. It is a non-musical sound with a frequency of about 100 ~ 128 times/second, long vibration duration and inconsistent sound. It is suggested that the elasticity, air content and density of lung tissue are normal.
Excessive voiced sound: it is between drum sound and unvoiced sound and belongs to the category of drum sound. Tone is lower than unvoiced, and voice is stronger than unvoiced. It's a kind of musical sound, a pathological tapping sound that normal adults don't appear. Clinically, it is common that the air content of lung tissue increases and the elasticity decreases, such as emphysema. Normal children can knock out relatively unvoiced sounds.
Extended data:
Voiced sound: It is a non-musical percussion sound with high pitch, weak voice and short vibration duration. In addition to sound, the vibration felt by the fingers of the board is also very weak. It is produced when knocking on a parenchymal organ covered by a small amount of air-containing tissue, such as knocking on the part of the heart or liver covered by the edge of the lung segment, or knocking under pathological conditions such as pneumonia (decreased air content in lung tissue).
Drumming: Like drumming, it is a harmonious musical sound. Sound is stronger than unvoiced sound, and the vibration lasts for a long time. Appears when knocking on a hollow organ containing a large amount of gas. Under normal circumstances, it can be seen in gastric vesicle area and abdomen, and under pathological conditions, it can be seen in lung cavity, pneumothorax and pneumoperitoneum.
Real sound: It is a kind of non-musical sound with higher pitch, weaker sound and shorter vibration duration than voiced sound, such as the sound made by hitting the heart, liver and other substantive organs. Under pathological conditions, a large number of pleural effusion or lung consolidation can be seen.