Dahl effect
Dahl effect
The Dahl effect (pronounced: /dɑːl/ effect) is a medical phenomenon observed in the field of cardiology. It is named after the Norwegian physician, Lars Dahl, who first described it in the mid-20th century.
Etymology
The term "Dahl effect" is derived from the name of Lars Dahl, a Norwegian physician who first described this phenomenon. The word "effect" comes from the Latin word "effectus", which means "accomplishment" or "performance".
Definition
The Dahl effect refers to the phenomenon where the blood pressure in the pulmonary artery decreases during exercise despite an increase in cardiac output. This is due to the dilation of the blood vessels in the lungs, which allows for increased blood flow without a corresponding increase in pressure.
Related Terms
- Cardiology: The branch of medicine dealing with disorders of the heart and parts of the circulatory system.
- Blood Pressure: The pressure of the blood in the circulatory system, often measured for diagnosis since it is closely related to the force and rate of the heartbeat and the diameter and elasticity of the arterial walls.
- Pulmonary Artery: The artery carrying blood from the right ventricle of the heart to the lungs for oxygenation.
- Exercise: Physical activity that is planned, structured, and repetitive for the purpose of conditioning any part of the body.
- Cardiac Output: The amount of blood the heart pumps through the circulatory system in a minute.
- Blood Vessels: The channels through which blood is distributed to body tissues.
- Lungs: The pair of organs situated within the rib cage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed.
External links
- Medical encyclopedia article on Dahl effect
- Wikipedia's article - Dahl effect
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