Tactile Fremitus
The term for vibrations felt on the chest wall when a patient speaks is "tactile fremitus."
What is Tactile Fremitus?
Tactile fremitus refers to the palpable vibrations transmitted through the chest wall during phonation (speaking). When a patient speaks, the vocal cords vibrate, creating sound waves that travel through the airways and lung parenchyma to the chest wall, where they can be felt by the examiner's hands.
Clinical Significance
The assessment of tactile fremitus is a fundamental component of the physical examination of the respiratory system. The examiner places their hands on the patient's chest wall and asks the patient to repeat words with strong consonants (classically "ninety-nine" or "boy-oh-boy") while comparing the intensity of vibrations between different areas of the chest and between the two sides.
Interpretation:
Increased fremitus occurs when lung tissue becomes more solid or consolidated (pneumonia, atelectasis with patent bronchus, pulmonary fibrosis), as sound transmits better through solid tissue than air-filled lung
Decreased or absent fremitus occurs with conditions that block sound transmission, including:
- Pleural effusion (fluid in pleural space)
- Pneumothorax (air in pleural space) 1
- Pleural thickening
- Bronchial obstruction
- Emphysema (hyperinflated lungs)
Related Terminology
While the provided evidence focuses primarily on chest wall vibrations in other contexts (singers 2, cardiac monitoring 3), the clinical examination finding of vibrations felt during speech specifically refers to tactile fremitus. This differs from:
- Vocal fremitus: Sometimes used interchangeably with tactile fremitus
- Chest wall vibrations during phonation: The mechanical phenomenon underlying tactile fremitus 2
- Decreased tactile fremitus: Specifically noted in thoracic trauma guidelines as a clinical finding in pneumothorax and hemothorax 1
The ability to detect these vibrations depends on the transmission of sound through lung tissue to the chest wall, making it a valuable bedside diagnostic tool for identifying pathology affecting the lungs, pleural space, or airways.