Stable
Vagal manoeuvres can be attempted in SVT. Note that these may result in other arrhythmias, and the operator should have the defibrillator available.
- step1: if vagal manouvres fail e.g. Valsalva, then adenosine 3 mg, rapid i.v. push
- step2: if SVT persists, then adenosine 6 mg, rapid i.v. push
- step3: if SVT persists, then adenosine 12 mg, rapid i.v.
push
If this fails, intravenous administration of following drugs may be effective:
- verapamil - provided the patient is not treated with beta blockers already
- beta-blockers
- disopyramide
- digoxin
- amiodarone
When chemical cardioversion is ineffective a DC shock may be required.
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