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Tachyarrhythmia: Difference between revisions
→Vagal manouevres
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* The patient is sitting in a semirecumbent position | * The patient is sitting in a semirecumbent position | ||
* The patient is asked to exhale forcefully against a closed glottis or a | * The patient is asked to exhale forcefully against a closed glottis or a syringe for 15 seconds | ||
* The patient is rapidly laid back down into supine position and the legs are elevated to 45 degrees | * The patient is rapidly laid back down into supine position and the legs are elevated to 45 degrees | ||
This manouevre increases the arterial pressure in the carotid sinuses and aortic arch, which triggers the baroreceptor reflex, which stimulates parasympathetic output to the heart via the vagus nerve. The parasympathetic stimulation produces negative chronotropic and dromotropic effects, mostly on the AV node, which may terminate the tachycardia. | |||
The "standard" Valsalva manoeuvre involves only exhaling forcefully, while the modified version (including lying down and raising legs) is more effective at terminating supraventricular tachycardias and should be used instead.<section end="A&IC" /> | The "standard" Valsalva manoeuvre involves only exhaling forcefully, while the modified version (including lying down and raising legs) is more effective at terminating supraventricular tachycardias and should be used instead.<section end="A&IC" /> | ||
[[Category:Cardiology]] | [[Category:Cardiology]] | ||