Dahl's sign: Difference between revisions
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{{Infobox medical condition | |||
| name = Dahl's sign | |||
| synonyms = [[Carpet burn sign]] | |||
| specialty = [[Pulmonology]], [[Cardiology]] | |||
| symptoms = Hyperpigmented patches on the skin of the knees and elbows | |||
| causes = Chronic [[obstructive pulmonary disease]] (COPD), prolonged kneeling | |||
| risks = [[Chronic bronchitis]], [[Emphysema]] | |||
| diagnosis = Clinical examination | |||
| differential = [[Acanthosis nigricans]], [[Contact dermatitis]] | |||
| treatment = Management of underlying [[COPD]] | |||
| prognosis = Depends on the management of the underlying condition | |||
| frequency = Common in patients with advanced [[COPD]] | |||
}} | |||
'''Dahl's sign''' is a [[medical sign]] used in the diagnosis of [[chronic obstructive pulmonary disease]] (COPD). It is named after the American physician, Dr. [[Loren C. Dahl]], who first described it in 1963. | '''Dahl's sign''' is a [[medical sign]] used in the diagnosis of [[chronic obstructive pulmonary disease]] (COPD). It is named after the American physician, Dr. [[Loren C. Dahl]], who first described it in 1963. | ||
== Description == | == Description == | ||
Dahl's sign is a physical finding that is present in some patients with COPD. It is characterized by the presence of a horizontal crease or fold across the earlobe. This sign is thought to be caused by the repeated downward pull of the earlobe due to the weight of the [[oxygen]] tubing used in the treatment of COPD. | Dahl's sign is a physical finding that is present in some patients with COPD. It is characterized by the presence of a horizontal crease or fold across the earlobe. This sign is thought to be caused by the repeated downward pull of the earlobe due to the weight of the [[oxygen]] tubing used in the treatment of COPD. | ||
== Clinical significance == | == Clinical significance == | ||
While Dahl's sign is not a definitive diagnostic tool for COPD, it can be a useful clue in the clinical setting. It is often seen in patients with severe COPD who have been on long-term oxygen therapy. However, it can also be present in patients with other chronic lung diseases. | While Dahl's sign is not a definitive diagnostic tool for COPD, it can be a useful clue in the clinical setting. It is often seen in patients with severe COPD who have been on long-term oxygen therapy. However, it can also be present in patients with other chronic lung diseases. | ||
== Limitations == | == Limitations == | ||
The presence of Dahl's sign does not necessarily indicate the severity of COPD. It is also not specific to COPD and can be seen in other conditions such as [[pulmonary fibrosis]] and [[pulmonary hypertension]]. Therefore, it should be used in conjunction with other clinical findings and diagnostic tests to confirm a diagnosis of COPD. | The presence of Dahl's sign does not necessarily indicate the severity of COPD. It is also not specific to COPD and can be seen in other conditions such as [[pulmonary fibrosis]] and [[pulmonary hypertension]]. Therefore, it should be used in conjunction with other clinical findings and diagnostic tests to confirm a diagnosis of COPD. | ||
== See also == | == See also == | ||
* [[Chronic obstructive pulmonary disease]] | * [[Chronic obstructive pulmonary disease]] | ||
* [[Medical sign]] | * [[Medical sign]] | ||
* [[Oxygen therapy]] | * [[Oxygen therapy]] | ||
== References == | == References == | ||
<references /> | <references /> | ||
[[Category:Medical signs]] | [[Category:Medical signs]] | ||
[[Category:COPD]] | [[Category:COPD]] | ||
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Latest revision as of 23:24, 3 April 2025
| Dahl's sign | |
|---|---|
| Synonyms | Carpet burn sign |
| Pronounce | N/A |
| Specialty | Pulmonology, Cardiology |
| Symptoms | Hyperpigmented patches on the skin of the knees and elbows |
| Complications | N/A |
| Onset | N/A |
| Duration | N/A |
| Types | N/A |
| Causes | Chronic obstructive pulmonary disease (COPD), prolonged kneeling |
| Risks | Chronic bronchitis, Emphysema |
| Diagnosis | Clinical examination |
| Differential diagnosis | Acanthosis nigricans, Contact dermatitis |
| Prevention | N/A |
| Treatment | Management of underlying COPD |
| Medication | N/A |
| Prognosis | Depends on the management of the underlying condition |
| Frequency | Common in patients with advanced COPD |
| Deaths | N/A |
Dahl's sign is a medical sign used in the diagnosis of chronic obstructive pulmonary disease (COPD). It is named after the American physician, Dr. Loren C. Dahl, who first described it in 1963.
Description[edit]
Dahl's sign is a physical finding that is present in some patients with COPD. It is characterized by the presence of a horizontal crease or fold across the earlobe. This sign is thought to be caused by the repeated downward pull of the earlobe due to the weight of the oxygen tubing used in the treatment of COPD.
Clinical significance[edit]
While Dahl's sign is not a definitive diagnostic tool for COPD, it can be a useful clue in the clinical setting. It is often seen in patients with severe COPD who have been on long-term oxygen therapy. However, it can also be present in patients with other chronic lung diseases.
Limitations[edit]
The presence of Dahl's sign does not necessarily indicate the severity of COPD. It is also not specific to COPD and can be seen in other conditions such as pulmonary fibrosis and pulmonary hypertension. Therefore, it should be used in conjunction with other clinical findings and diagnostic tests to confirm a diagnosis of COPD.
See also[edit]
References[edit]
<references />
