12 Cancer Pain Management Chow Flashcards
What are the causes of pain in cancer patients?
Organ invasion/bone metastasis. Nerve damage. Endothelial/Vascular inflammation. Injection site pain. Perioperative pain
What is Nociceptive pain?
Result of nociceptor activation d/t injury to somatic and visceral structures. “Aching”, “Throbbing”, “Pressure”, usually “Localized”
What are some examples of Nociceptive Pain?
Bruises, burns. Bone fractures/metastasis. Obstruction, inflammation
What is Neuropathic Pain?
Injury to central or peripheral nervous system. “Numb”, “Tingling”, “Shooting pain”, “Electric Shock”
What are some examples of Neuropathic Pain?
Spinal stenosis. Diabetic neuropathy. Chemotherapy (Paclitaxel, Vincristine)
For the NCCN Adult Cancer Pain, what is done for Mild Pain (1-3)?
Non-opiods: Acetaminophen, NSAIDs. Re-evaluate at each contact
For the NCCN Adult Cancer Pain, what is done for Moderate Pain (4-6)?
Titrate short-acting opiods: Codeine, Tramadol, Morphine, etc. Reassess pain score within 15-60 minutes
For the NCCN Adult Cancer Pain, what is done for Severe Pain (7-10)?
RAPIDLY titrate short-acting opiod: Morphine, etc. Reassess pain score within 15-60 minutes
What is done for Opioid-Tolerant patients?
Calculate opioid usage for the previous 24hrs. Give 10-20% of previous 24hr-requirement as initial dose for breakthrough pain. Reassess efficacy (chain in pain score) and adverse effects
What is done for Maintenance opiod analgesics for CHRONIC cancer pain?
Consider converting to long-acting or extended release formulations. Provide around-the-clock AND breakthrough medications. Use the same opiod for extended-release and short-acting formulations if possible. Consider opioid conversion/rotation to provide adequate pain control and minimize side effects
What are “Mild” Opioids?
Tramadol, Codeine
What are “Strong” Opioids?
Morphine, Fentanyl
What are the 1st line analgesics for mild to moderate pain?
NSAIDs
What are the cons with NSAIDS?
Caution in patients with thrombocytopenia, bleeding disorder, or renal insufficiency. Many drug-drug interactions (e.g. decreases clearance of MTX)
What are some considerations with Acetaminophen use?
No anti-inflammatory properties. Caution in hepatic impairment. Often in combination pain medications (increased risk of accidental overdose). Anti-pyretic (increased risk of masking fever in neutropenic patients)
What are the characteristics of Codeine?
For acute pain. Prodrug of morphine with 5-10% conversion via CYP 2D6. Requires dosage adjustment based on renal function. Usual dose: 30-120mg PO Q4-6hrs PRN pain
What are the characteristics of Tramadol?
For acute pain. Weak m-receptor agonist, serotonin inhibitor, NE reuptake inhibitor. Usual dose: 50-100mg PO Q4-6hrs PRN pain (Max of 400mg/day)
What are some cautions with Tramadol use?
Decreases seizure threshold. Increases risk of serotonin syndrome with SSRI/MAOI