Final answer:
The appropriate treatment for an unstable patient experiencing supraventricular tachycardia may include urgent treatment with cardioversion or defibrillation, medication, or medical procedures.
Step-by-step explanation:
The appropriate treatment for an unstable patient experiencing supraventricular tachycardia would depend on the severity of the symptoms. In urgent cases, the patient may receive treatment with a controlled electric shock through cardioversion or defibrillation. Medications, such as beta blockers or antiarrhythmic agents, may also be prescribed to attempt to restore a normal heart rhythm. In some cases, medical procedures such as inserting a pacemaker or surgical intervention may be necessary.