| narrow complex tachycardia |
Tachycardia in which the duration of the QRS complex is less than 0.12 seconds. Most narrow complex tachycardias originate from a pacemaker above the ventricles, and are therefore supraventricular tachycardias.
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| narrow spectrum |
A term that refers to an antibiotic effective against only a few microorganisms.
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| narrow-spectrum antibiotic |
An antibiotic that is specifically effective against a limited group of microorganisms.
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