Final answer:
Hemodialysis is indicated for methanol toxicity when blood levels are typically above 20-30 mg/dL, or with severe symptoms. It involves the removal of methanol and its toxic metabolites from the blood.
Step-by-step explanation:
The question pertains to the treatment of methanol poisoning and specifically about the serum level threshold that warrants dialysis. Methanol toxicity is a dangerous condition that can lead to acidosis and central nervous system depression. When methanol is consumed, it gets metabolized to formaldehyde and formic acid, both of which are toxic. The therapy includes administration of ethanol, which competes with methanol for metabolism, thus slowing the formation of these toxic metabolites.
Hemodialysis is indicated when there is a significantly high level of methanol in the blood, typically above 20-30 mg/dL, or if there is a severe acidosis or the presence of visual symptoms even with lower levels of methanol. Hemodialysis helps to rapidly remove both methanol and formic acid from the blood, thus reducing the risk of toxicity. It is a medical emergency and requires immediate attention and intervention.