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Percussion (medicine)

life science Maturity 11-13 Next article →

Percussion is a vital technique used during clinical examinations. It is one of four primary methods doctors use to assess a patient. These four methods include inspection, palpation, auscultation, and inquiry. Percussion specifically involves tapping on the surface of the body. This action helps a clinician determine the nature of the underlying structures. By listening and feeling, they can learn about the state of the thorax or the abdomen.

The mechanism of percussion relies on the principle of vibration. When a doctor taps the body, they set the tissues and spaces between them into vibration. This movement generates specific sounds and tactile sensations. The clinician uses both auditory perception, which is hearing, and tactile perception, which is feeling. They listen to the notes produced by the vibrations. They also feel the sensations transmitted to their fingers. These physical clues help determine if the tissue is healthy or pathological.

To perform percussion, a doctor uses a specific hand technique. They use the middle finger of one hand to tap the middle finger of the other hand. This is done using a quick wrist action. The finger that stays stationary on the body is called the pleximeter. The pleximeter must be placed firmly on the tissue. There are two main styles of this technique. Direct percussion uses only one or two fingers. Indirect percussion uses the middle or flexor finger to strike the pleximeter.

Sometimes, the doctor does not need a pleximeter. If they are tapping on a bony area, such as the clavicle, they can tap the bone directly. This is useful for checking specific areas, like an apical cavitary lung lesion. Such lesions are often typical of tuberculosis. The choice of method depends on whether the doctor is tapping on soft tissue or bone. This allows the clinician to reach different depths and structures within the body.

Clinicians categorize the sounds produced into four broad types. A resonant sound is the normal sound produced when percussing a healthy chest. A tympanitic sound is a drum-like noise. This is heard over air-filled structures during an abdominal examination. Hyperresonant sounds are different from normal resonance. They are said to sound similar to the sound made when percussing puffed-up cheeks. This specific sound can indicate a pneumothorax.

Other sounds indicate the presence of solid material. A dull sound suggests a solid mass is under the surface. For example, percussing a mass like the liver produces a dull sound. This is often called consolidation. There is also a sound known as stony dull. This occurs when the pleximeter produces a sound with no contribution from the underlying area. Impaired resonance is also possible. This results in percussion sounds that are lower than normal. These sounds might indicate a mass or consolidation.

The history of percussion is quite interesting. It was originally used to distinguish between empty and filled barrels of liquor. Dr. Leopold Auenbrugger is credited with introducing the technique to modern medicine. However, the method has much older roots. The physician Avicenna used percussion for medical practice about 1,000 years before Auenbrugger. Avicenna used it to check how full a stomach was. He also used it to distinguish between ascites and tympanites.

Percussion is highly significant for diagnosing various medical conditions. In the thorax, or chest, it helps diagnose emphysema and pneumothorax. It can also assess the respiratory mobility of the thorax. In the abdomen, it is used to find organomegaly. Organomegaly is the medical term for an enlarged organ. Doctors use these sounds to see if an organ has grown too large. Additionally, the process of percussion may induce pain. If a patient feels pain, the doctor notes this, as it can indicate underlying pathology.

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