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Medical - Medical: Cardiology | | English term or phrase: sinus node | Definition from Medical University of South Carolina :
bundle of excitatory tissue found in the right atrium that functions as the pacemaker of the heart
Example sentence(s): - The autonomic nervous system, the same part of the nervous system as controls the blood pressure, controls the firing of the sinus node to trigger the start of the cardiac cycle. medterms.com
- If the sinus node is not functioning normally -- due to damage from surgery, drugs, congenital heart defects or other causes -- the heartbeat may become very slow with a decrease in blood pressure. University of California
- Extrinsic sinus mechanisms of sinus node dysfunction could be drug effects or due to autonomic influences. The important drugs which could suppress sinus node function are beta blockers, non-dihydropyridine calcium channel blockers (e.g. verapamil and diltiazem), digoxin, clonidine, methyl dopa, class IA, IC and III antiarrhythmic agents and lithium. Cardiophile for Medical Professionals
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| nódulo sinusal | Definition:
NODULO SINUSAL
Tiene la forma de un pez, mide alrededor de 15 milímetros de longitud, hasta 5 milímetros de ancho y 1 a 2 milímetros de espesor. Descansa sobre una de sus caras en el surco terminal, en el límite entre vena cava superior y aurícula derecha (Fig. 1-29). Se halla bajo el epicardio. En los cortes transversales aparece como un tejido compacto, de contornos fusados y con un pequeño orificio central, que corresponde a la arteria sinusal. Histológicamente está constituido por fibras específicas en su mayor parte delgadas y pequeñas, entremezcladas íntimamente con tejido conectivo con abundante colágeno. |
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 Rita Tepper
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