Resonance is best described as?

Appeared in: DSSSB Public Health Nurse - 2015

Explanation

Resonance is the characteristic sound produced when percussing over healthy, air-filled lung tissue.
It is described as a loud, low-pitched, clear, and hollow sound with a long duration.
This sound confirms that the underlying lung tissue is functioning normally and is not filled with fluid, consolidated, or hyperinflated.

Option B: This description does not match any standard percussion note. 'Threading' is a term used to describe pulse quality (a thready pulse), not a sound from percussion.
Option C: Resonance is not typically described as 'musical'. While tympany can sometimes have a high-pitched or musical quality, the primary characteristic of resonance is its hollow nature.
Option D: A 'drum-like' sound is the classic description for tympany, not resonance.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Percussion sounds in physical assessment as background academic context rather than a clinical decision trigger.
Percussion is a fundamental nursing assessment skill used to evaluate the condition of underlying tissues, particularly in the chest and abdomen, without invasive tools.
Identifying an abnormal sound, such as dullness over a lung field where resonance is expected, can be an early indicator of pathology like pneumonia, pleural effusion, or a tumor, prompting further investigation.
What if? If a nurse percusses the chest of a patient with advanced emphysema, they would likely hear hyperresonance (a louder, lower-pitched sound) instead of normal resonance. This is due to air trapping and hyperinflation of the lungs, which is a hallmark of the disease.

How to Approach the Question

Identify the core concept: The question asks for the best description of 'resonance' in the context of a physical examination.
Recall the five main percussion sounds: flatness, dullness, resonance, hyperresonance, and tympany.
Associate each sound with its quality and the type of tissue that produces it. Resonance is specifically linked to healthy, air-filled lung tissue.
Evaluate the options based on these associations. 'Sounds created by air-filled lungs' is the direct definition of the source of resonance.
Eliminate the other options by correctly identifying their descriptions: 'Drum-like' is tympany, and the other descriptions are inaccurate for any standard percussion note.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 716-718

E6 Medicine Macleod Clinical Examination 15e p. 105-107

Practise the full DSSSB Public Health Nurse - 2015

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