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Normal breath sounds are classified as vesicular, bronchovesicular, bronchial or tracheal based on the anatomical location of auscultation. [4] [3] Normal breath sounds can also be identified by patterns of sound duration and the quality of the sound as described in the table below: [4]
Normally, the sound of the patient's voice becomes less distinct as the auscultation moves peripherally; bronchophony is the phenomenon of the patient's voice remaining loud at the periphery of the lungs or sounding louder than usual over a distinct area of consolidation, such as in pneumonia.
Auscultation (based on the Latin verb auscultare "to listen") is listening to the internal sounds of the body, usually using a stethoscope. Auscultation is performed for the purposes of examining the circulatory and respiratory systems (heart and breath sounds), as well as the alimentary canal. The term was introduced by René Laennec. The act ...
The anterior fields can also be auscultated from the front. [15] [16] An area of thinner musculature on the back where sounds may be more audible is called the triangle of auscultation. [17] During auscultation, deep breaths are taken through the mouth and abnormal sounds listened for. [18] [19] Abnormal sounds include:
Understanding Lung Sounds 3rd edition (2002) by Steven Lehrer is a book and audio CD that guides the student through the skills of lung auscultation. It provides a complete overview of lung examination, anatomy, physiology, and pathology.
Normal resonance/ Resonant, the sound produced by percussing a normal chest. Impaired resonance (mass, consolidation) lower than normal percussion sounds. Dull (consolidation), similar to percussion of a mass such as a liver. Stony dull, the sounds produced on percussion from the pleximeter with no contribution from the underlying area.
In days before X-rays were discovered, the sound of swallowed liquids were auscultated over this triangle to confirm an oesophageal tumour. To better expose the floor of the triangle up of the posterior thoracic wall in the 6th and 7th intercostal space, a patient is asked to fold their arms across their chest , laterally rotating the scapulae ...
Their presence usually indicates an interstitial process, such as pulmonary fibrosis or congestive heart failure. The sounds from interstitial pulmonary fibrosis have been described as sounding like opening a Velcro fastener. Coarse crackles are somewhat louder, lower in pitch, and last longer than fine crackles.