Final answer:
For irregular wide-complex tachycardia, avoidance of certain negative inotropic agents such as specific beta blockers and calcium channel blockers is advisable due to their potential to worsen the condition. Potassium channel blockers may be used cautiously, depending on individual patient evaluation.
Step-by-step explanation:
Patients with an irregular wide-complex tachycardia should avoid certain medications that could exacerbate their condition. Negative inotropic agents, such as specific beta blockers and calcium channel blockers, can decrease the strength of heart muscle contraction and should be used with caution. These drugs include early beta blocker examples like propranolol and pronethalol. Calcium channel blockers are subdivided into dihydropyridine, phenylalkylamine, and benzothiazepine classes, which can all affect cardiac contractility and rhythm. Potassium channel blockers like amiodarone and procainamide might be helpful in certain arrhythmias by affecting the repolarization phase of the action potential, but their use must be evaluated on a case-by-case basis determined by the specifics of the dysrhythmia and the patient's overall condition.