การรักษาด้วยไอโอดีนกัมมันตรังสี (I-131)

Key Facts

• Single injection of iodine-131 given under the skin; curative in 96-98% of cats
• Iodine attaches selectively to thyroid tissue; emitted beta particles destroy only the tumor
• Cat must be quarantined at the facility for 3-7 days until radiation levels drop
• Home restrictions for ~10 days after release: confined indoors, flushable litter, limited human contact
• Children and pregnant women must avoid the cat during this period
• Pertechnetate scan before treatment identifies tumor extent, guides dosing, detects malignancy (3-5%)
• Skipping the scan risks under- or overdosing and missing cancer
• Less than 5% of cats become hypothyroid afterward (requiring thyroid supplementation)
• Not recommended for cats with poor kidney function until kidney status is evaluated
• Also used for canine thyroid carcinoma at much higher doses
• Species: cats (primarily); dogs (for thyroid carcinoma)