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Acquired pseudocholinesterase deficiency after high-dose cyclophosphamide.

V Koseoglu1, J Chiang, K W Chan

  • 1Division of Pediatrics, University of Texas MD Anderson Cancer, Houston, TX, USA.

Bone Marrow Transplantation
|January 11, 2000
PubMed
Summary
This summary is machine-generated.

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High-dose cyclophosphamide chemotherapy can cause severe pseudocholinesterase (PSC) deficiency, prolonging the effects of succinylcholine anesthesia. This case highlights the risk of neuromuscular blockade after chemotherapy.

Area of Science:

  • Anesthesiology
  • Pharmacology
  • Oncology

Background:

  • Pseudocholinesterase (PSC) is crucial for metabolizing succinylcholine, a common anesthetic neuromuscular blocker.
  • Reduced PSC activity can lead to prolonged paralysis and apnea after succinylcholine administration.
  • Cyclophosphamide is known to inhibit PSC, with potential dose-dependent effects.

Observation:

  • A patient receiving high-dose cyclophosphamide (7 g/m2) developed severe PSC deficiency.
  • Nine hours post-chemotherapy, the patient received succinylcholine for anesthesia.
  • This resulted in unexpectedly prolonged apnea, indicating sustained succinylcholine action.

Findings:

  • High-dose cyclophosphamide can induce significant, dose-dependent pseudocholinesterase deficiency.

Related Experiment Videos

  • This deficiency can manifest as prolonged neuromuscular blockade when succinylcholine is administered post-chemotherapy.
  • The timing of succinylcholine administration relative to cyclophosphamide is critical.

    • Implications:

    • Clinicians should be aware of the risk of drug-induced PSC deficiency following high-dose cyclophosphamide.
    • Caution is advised when using depolarizing neuromuscular relaxants like succinylcholine shortly after high-dose chemotherapy.
    • Monitoring PSC activity or considering alternative anesthetic agents may be warranted in such cases.