Modified Valsalva Manoeuvre

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Last updated 6:27 AM on 6/8/26
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9 Terms

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What is it used for?

It is used in stable patients with SVT to increase vagal tone and slow conduction through the atrioventricular (AV) node.

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Mechanism of action – Phase 1 - Onset strain

Increased intrathoracic pressure: Brief ↑ BP

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Mechanism of action – Phase II – Continued Strain

Reduced venous return: ↓ BP, reflex ↑ HR

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Mechanims of action - Phase III – Release of Strain

Release of strain - Brief ↓ BP

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Mechanism of action - Phase IV – Recovery/Overshoot

Venous return and BP overshoot: ↑ Vagal tone → slows AV node → may terminate SVT

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Indications

Haemodynamically stable SVT patient

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Contraindications (hungry, acute, aortic, raging, rabbits, grab, red, 3s)

Hypotension, AF, Aortic stenosis, recent MI with 3 months, requirements for immediate cardioversion, glaucoma, retinopathy, 3rd trimester of pregnancy

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Complication

Syncope, prolonged hypotensive state

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Limitations of this manoeuvre

Can only be done a maximum of three times