What drugs should be avoided with pseudocholinesterase deficiency?
The use of succinylcholine, mivacurium and ester local anesthetics must be avoided in patients with pseudocholinesterase deficiency because these patients may not be able to metabolize such anesthetics.
What can cause low cholinesterase?
Reduced cholinesterase levels can also be caused by chronic liver disease and malnutrition. Total cholinesterase activity can be lowered in a number of other conditions, including pregnancy, renal disease, shock, and some cancers.
What does a low dibucaine number mean?
Dibucaine inhibits normal enzyme to far greater extent that variant. Thus, if the dibucaine number is low (i.e. the native enzyme is not inhibited by dibucaine), one should suspect an abnormal variant of butyrylcholinesterase.
How does succinylcholine cause paralysis?
Mechanism of Action A depolarizing neuromuscular blocking agent, succinylcholine adheres with post-synaptic cholinergic receptors of the motor endplate, inducing continuous disruption that results in transient fasciculations or involuntary muscle contractions and subsequent skeletal muscle paralysis.
How is pseudocholinesterase deficiency treated?
There is no cure for pseudocholinesterase deficiency. If you have the condition and you receive muscle relaxants that prolong your anesthesia recovery, you’ll likely need medical assistance. If needed, mechanical ventilation support and sedation are provided while you recover and start breathing on your own.
How does dibucaine test work?
The dibucaine number indicates the percent inhibition of enzyme activity by this agent when a serum or plasma sample is tested under standard conditions (inhibition expressed as a percent).
What is the normal cholinesterase level?
Normal Results Typically, normal pseudocholinesterase values range between 8 and 18 units per milliliter (U/mL) or 8 and 18 kilounits per liter (kU/L). Note: Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.
What is normal dibucaine number?
Typical measurement of dibucaine number in the United States yields values of 80 and above for wild type homozygotes (normal), 40–60 for heterozygotes (atypical), and 20 or less for atypical homozygotes.
How does dibucaine number work?
Does succinylcholine cause hypertension?
Common side effects of succinylcholine include: Jaw rigidity. Low blood pressure (hypotension) Muscle fasciculation may result in postoperative pain.
What is pseudocholinesterase deficiency?
Supplementary Content A disorder caused by atypical or deficiency of pseudocholinesterase (PCE) leading to prolonged paralysis after administration of succinylcholine or mivacurium.
What is butyrylcholinesterase deficiency?
Pseudocholinesterase deficiency, also known as butyrylcholinesterase deficiency, refers to a rare acquired or inherited defect in the pseudocholinesterase enzyme produced by the liver.[1] In clinical anesthesia practice, the muscle relaxants succinylcholine and mivacurium are drugs used to optimize intubating conditions and surgical exposure.[2]
What is the incidence of cholinesterase deficiency in the US?
Pseudocholinesterase Deficiency; Plasma Cholinesterase Deficiency; Butyrylcholinesterase Deficiency; Cholinesterase II Deficiency; Succinylcholine Sensitivity; Suxamethonium Sensitivity. For homozygosity, the incidence is approximately 1:2,000-4,000, whereas the incidence for heterozygosity increases to up to 1:500.
How does dibucaine affect butyrylcholinesterase?
Dibucaine inhibits normal enzyme to far greater extent that variant. Thus, if the dibucaine number is low (i.e. the native enzyme is not inhibited by dibucaine), one should suspect an abnormal variant of butyrylcholinesterase.