| first intention healing |
Healing that takes place when wound edges are held or sutured together without the formation of obvious granulation tissue. SEE: healing.
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| first pass metabolism |
The metabolism of a substance that occurs immediately as it enters the body, and before it can exert any effect, or before it can be measured at its target organ.
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| first responder |
1. The first individual to arrive at the scene of an emergency. Many communities have made an effort to train public safety personnel (e.g., police and fire department) or other volunteers to respond to trauma and medical emerge
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| first trimester |
The first 3 months of pregnancy.
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| first-degree atrioventricular block |
Delayed conduction through or from the atrioventricular node, marked on the electrocardiogram by a prolonged PR interval. Usually no treatment is necessary.
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