'When percussing the anterior chest for tone, a nurse must anticipate resonance tone over the majority of the lung fields.
Normally, the rest of the lung fields are considered resonant. The case of decreased or increased resonance is abnormal. Increased resonances can be noted either due to distention of the lungs which is seen in asthma, emphysema, or bullous disease as well as which is due to Pneumothorax. The rate of decreased resonance is noted with pleural effusion type and all other diseases affecting the lungs.
Resonant sounds are considered as low-pitched as the hollow sounds are heard over normal tissue of the lungs. Those particular flat or extremely dull sounds are heard over solid areas called bones normally. Dull or those thud-like sounds are normally heard over densely covered areas which will be the heart or liver.
Resonance is occurring whenever the applied force frequency is equal to one of the natural type of frequencies of vibration of the forced oscillator of the harmonium. Swing, Guitar, Pendulum, Bridge as well as the Music system are considered a few examples of resonance in day-to-day life.
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