Final answer:
The treatment for stable tachycardia with wide QRS is typically procainamide or a controlled electric shock via cardioversion or defibrillation. In chronic cases, a pacemaker or implantable cardioverter defibrillator may be used.
Step-by-step explanation:
The treatment for stable tachycardia with wide QRS that is regular and monomorphic typically includes the administration of antiarrhythmic agents or a medical procedure. Medications such as procainamide are used to restore a normal heart rhythm. However, these medications may have significant side effects, particularly if used long-term. In more severe cases of arrhythmia that do not respond to medication, a patient may need urgent treatment with controlled electric shock in the form of cardioversion or defibrillation. This approach can quickly restore a normal heart rhythm. For those with chronic arrhythmia issues, a cardiologist may opt to implant a pacemaker or an implantable cardioverter defibrillator to maintain a proper heart rhythm.