Dahl
Dahl's sign
Dahl's sign (pronounced: dahlz sign) is a clinical sign in medicine that indicates the presence of chronic obstructive pulmonary disease (COPD). It is named after the American physician, Dr. Leland G. Dahl, who first described it in 1960.
Etymology
The term "Dahl's sign" is derived from the name of Dr. Leland G. Dahl, an American physician who first described the sign in 1960. The term "sign" in this context is used to denote a physical finding that indicates a specific medical condition.
Definition
Dahl's sign is a horizontal groove or depression in the lower margin of the pectoralis major muscle and the latissimus dorsi muscle on the chest wall. This groove is caused by the habitual use of the accessory muscles of respiration, particularly during episodes of acute exacerbation of COPD.
Related Terms
- Chronic Obstructive Pulmonary Disease (COPD): A type of obstructive lung disease characterized by long-term breathing problems and poor airflow.
- Pectoralis Major Muscle: A thick, fan-shaped muscle situated at the chest (anterior) of the human body.
- Latissimus Dorsi Muscle: A large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline.
- Accessory Muscles of Respiration: Muscles not typically used for breathing, but can be used to aid in respiration in certain conditions, such as COPD.
External links
- Medical encyclopedia article on Dahl
- Wikipedia's article - Dahl
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