Hypercholinesterasaemia and suxamethonium resistance

Area of Science:

• Biochemistry
• Pharmacology
• Genetics

Background:

• Suxamethonium is a widely used muscle relaxant in anesthesia.
• Its action is typically terminated by plasma pseudocholinesterase.
• Resistance to suxamethonium can prolong neuromuscular blockade.

Observation:

• A case of unexpected resistance to suxamethonium's muscle-relaxing effects is reported.
• This resistance was attributed to a rare inherited condition known as hypercholinesterasaemia.
• Family studies indicated a pattern of dominant inheritance for this condition.

Findings:

• Hypercholinesterasaemia leads to reduced activity of plasma pseudocholinesterase.
• This reduced enzyme activity results in prolonged hydrolysis of suxamethonium.
• Consequently, patients with hypercholinesterasaemia exhibit resistance to suxamethonium's neuromuscular blockade.

Implications:

• Hypercholinesterasaemia is a critical consideration in patients displaying resistance to suxamethonium.
• Early identification and consideration of this condition can prevent prolonged anesthesia and potential complications.
• Further investigation into genetic factors influencing drug metabolism is warranted.