Palliative Care – An Overview Professor and Section Head, Palliative Medicine, University of Manitoba Medical Director, Winnipeg Regional Health Authority.
Presentation on theme: "Pain Management In Palliative Care Mike Harlos MD, CCFP, FCFP Professor and Section Head, Palliative Medicine, University of Manitoba Medical Director,"— Presentation transcript:
Pain Management In Palliative Care Mike Harlos MD, CCFP, FCFP Professor and Section Head, Palliative Medicine, University of Manitoba Medical Director, WRHA Palliative Care Medical Director, Pediatric Symptom Management Service
Pain An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage. International Association for the Study of Pain
Clinical Terms For The Sensory Disturbances Associated With Pain Dysesthesia – An unpleasant abnormal sensation, whether spontaneous or evoked. Allodynia – Pain due to a stimulus which does not normally provoke pain, such as pain caused by light touch to the skin Hyperalgesia – An increased response to a stimulus which is normally painful Hyperesthesia - Increased sensitivity to stimulation, excluding the special senses. Hyperesthesia includes both allodynia and hyperalgesia, but the more specific terms should be used wherever they are applicable.
Approach To Pain Control in Palliative Care 1.Thorough assessment by skilled and knowledgeable clinician –History –Physical Examination 2.Pause here - discuss with patient/family the goals of care, hopes, expectations, anticipated course of illness. This will influence consideration of investigations and interventions 3.Investigations – X-Ray, CT, MRI, etc - if they will affect approach to care 4.Treatments – pharmacological and non-pharmacological; interventional analgesia (e.g.. Spinal) 5.Ongoing reassessment and review of options, goals, expectations, etc.
Somatic Pain Aching, often constant May be dull or sharp Often worse with movement Well localized Eg/ – Bone & soft tissueBone – chest wall
Spinal cord compression in vertebral mets: Pain = earliest feature Risk of pathological fracture Indications for prophylactic surgery in large, weight- bearing bones –Cortical Lesions Destruction of > 50% of the cortical width Axial length of lesion > diameter of the bone > 2 – 3 cm lesion –Medullary lesions Lesion > 50% of the medulla Pain unrelieved by radiotherapy Special Considerations in Bone Pain
Visceral Pain Constant or crampy Aching Poorly localized Referred Eg/ – CA pancreas – Liver capsule distension – Bowel obstruction
COMPONENTDESCRIPTORSEXAMPLES Steady, Dysesthetic Burning, Tingling Constant, Aching Squeezing, Itching Allodynia Hypersthesia Diabetic neuropathy Post-herpetic neuropathy Paroxysmal, Neuralgic Stabbing Shock-like, electric Shooting Lancinating trigeminal neuralgia may be a component of any neuropathic pain FEATURES OF NEUROPATHIC PAIN
Describing pain only in terms of its intensity is like describing music only in terms of its loudness von Baeyer CL; Pain Research and Management 11(3) 2006; p
PAIN HISTORY Description: severity, quality, location, temporal features, frequency, aggravating & alleviating factors Previous history Context: social, cultural, emotional, spiritual factors Meaning Interventions: what has been tried?
Example Of A Numbered Scale
Dose Route Frequency Duration Efficacy Adverse effects Medication(s) Taken
Physical Exam In Pain Assessment Inspection / Observation Overall impression… the gestalt? Facial expression: Grimacing; furrowed brow; appears anxious; flat affect Body position and spontaneous movement: there may be positioning to protect painful areas, limited movement due to pain Diaphoresis – can be caused by pain Areas of redness, swelling Atrophied muscles Gait Myoclonus – possibly indicating opioid-induced neurotoxicity You can observe a lot just by watching Yogi Berra Yogi Berra
Physical Exam In Pain Assessment Palpation Localized tenderness to pressure or percussion Fullness / mass Induration / warmth
Physical Exam In Pain Assessment Neurological Examination Important in evaluating pain, due to the possibility of spinal cord compression, and nerve root or peripheral nerve lesions Sensory examination –Areas of numbness / decreased sensation –Areas of increased sensitivity, such as allodynia or hyperalgesia Motor (strength) exam - caution if bony metastases (may fracture) Deep tendon reflexes – intensity, symmetry –Hyperreflexia and clonus: possible upper motor neuron lesion, such as spinal cord compression or cerebral metastases. –Hyoporeflexia - possible lower motor neuron impairment, including lesions of the cauda equina of the spinal cord or leptomeningeal metastases. Sacral reflexes – diminished rectal tone and absent anal reflexes may indicate cauda equina involvement of by tumour
Physical Exam In Pain Assessment Other Exam Considerations Further areas of focus of the physical examination are determined by the clinical presentation. Eg: evaluation of pleuritic chest pain would involve a detailed respiratory and chest wall examination.
+/- adjuvant Non-opioid Weak opioid Strong opioid Pain persists or increases By the Clock W.H.O. ANALGESIC LADDER +/- adjuvant 1 2 3
STRONG OPIOIDS most commonly use: –morphine –Hydromorphone (Dilaudid ®) –transdermal fentanyl (Duragesic®) –oxycodone –Methadone DO NOT use meperidine (Demerol ) long-term –active metabolite normeperidine seizures
OPIOIDS and INCOMPLETE CROSS-TOLERANCE conversion tables assume that tolerance to a specific opioid is fully crossed over to other opioids. cross-tolerance unpredictable, especially in: –high doses –long-term use divide calculated dose in ½ and titrate
NB: Does not consider incomplete cross-tolerance Drug Approximate Equipotency with Morphine (Morphine:Drug) Hydromorphone5:1 Oxycodone1.5:1 to 2:1 Codeine1:12 Methadone Daily Morphine Dose 30 – 90 mg3.7:1 90 – 300 mg7.75:1 > 300 mg12.75:1 Fentanyl 80:1 to 100:1 (for subcutaneous dosing of each)
TITRATING OPIOIDS dose increase depends on the situation dose by % EXAMPLE: (doses in mg q4h)
TOLERANCE A normal physiological phenomenon in which increasing doses are required to produce the same effect Inturrisi C, Hanks G. Oxford Textbook of Palliative Medicine 1993: Chapter 4.2.3
PHYSICAL DEPENDENCE A normal physiological phenomenon in which a withdrawal syndrome occurs when an opioid is abruptly discontinued or an opioid antagonist is administered Inturrisi C, Hanks G. Oxford Textbook of Palliative Medicine 1993: Chapter 4.2.3
PSYCHOLOGICAL DEPENDENCE and ADDICTION A pattern of drug use characterized by a continued craving for an opioid which is manifest as compulsive drug-seeking behaviour leading to an overwhelming involvement in the use and procurement of the drug Inturrisi C, Hanks G. Oxford Textbook of Palliative Medicine 1993: Chapter 4.2.3
po / sublingual / rectal routes SQ / IV / IM routes reduce by ½ Changing Route Of Administration In Chronic Opioid Dosing
Using Opioids for Breakthrough Pain Patient must feel in control, empowered Use aggressive dose and interval Patient Taking Short-Acting Opioids: % of the q4h dose, given q1h prn Patient Taking Long-Acting Opioids: % of total daily dose given, q1h prn with short-acting opioid preparation
Opioid Side Effects Constipation – need proactive laxative use Nausea/vomiting – consider treating with dopamine antagonists and/or prokinetics (metoclopramide, domperidone, prochlorperazine [Stemetil], haloperidol) Urinary retention Itch/rash – worse in children; may need low-dose naloxone infusion. May try antihistamines, however not great success Dry mouth Respiratory depression – uncommon when titrated in response to symptom Drug interactions Neurotoxicity (OIN): delirium, myoclonus seizures
Seizures, Death Opioid tolerance Mild myoclonus (eg. with sleeping) Severe myoclonus Delirium Agitation Misinterpreted as Pain Opioids Increased Hyperalgesia Misinterpreted as Disease-Related Pain Opioids Increased Spectrum of Opioid-Induced Neurotoxicity
OIN: Treatment Switch opioid (rotation) or reduce opioid dose; usually much lower than expected doses of alternate opioid required… often use prn initially Hydration Benzodiazepines for neuromuscular excitation
Adjuvant Analgesics first developed for non-analgesic indications subsequently found to have analgesic activity in specific pain scenarios Common uses: –pain poorly-responsive to opioids (eg. neuropathic pain), or –with intentions of lowering the total opioid dose and thereby mitigate opioid side effects.
Adjuvants Used In Palliative Care General / Non-specific –corticosteroids –cannabinoids (not yet commonly used for pain)cannabinoids Neuropathic Pain –gabapentin –antidepressants –ketamine –topiramate –clonidine Bone Pain –bisphosphonates –(calcitonin)
inflammation edema spontaneous nerve depolarization tumor mass effects CORTICOSTEROIDS AS ADJUVANTS }
IMMEDIATELONG-TERM Psychiatric Hyperglycemia risk of GI bleed gastritis aggravation of existing lesion (ulcer, tumor) Immunosuppression Proximal myopathy often < 15 days Cushings syndrome Osteoporosis Aseptic / avascular necrosis of bone CORTICOSTEROIDS: ADVERSE EFFECTS
DEXAMETHASONE minimal mineralcorticoid effects po/iv/sq/?sublingual routes perhaps can be given once/day; often given more frequently If an acute course is discontinued within 2 wks, adrenal suppression not likely
Gabapentin Common Starting Regimen –300 mg hs Day 1, 300 mg bid Day2, 300 mg tid Day 3, then gradually titrate to effect up to 1200 mg tid Frail patients –100 mg hs Day 1, 100 mg bid Day 2, 100 mg tid Day 3, then gradually titrate to effect
Incident Pain Pain occurring as a direct and immediate consequence of a movement or activity
Circumstances In Which Incident Pain Often Occurs Bone metastases Neuropathic pain Intra-abd. disease aggravated by respiration » incident = breathing » ruptured viscus, peritonitis, liver hemorrhage Skin ulcer: dressing change, debridement Disimpaction Catheterization
Time Incident Pain Having a steady level of enough opioid to treat the peaks of incident pain......would result in excessive dosing for the periods between incidents
Fentanyl and Sufentanil synthetic µ agonist opioids highly lipid soluble transmucosal absorption; effect in approx 10 min rapid redistribution, including in / out of CSF; lasts approx 1 hr. fentanyl » 100x stronger than morphine sufentanil » 1000x stronger than morphine 10 mg morphine 10 µg sufentanil 100 µg fentanyl
INCIDENT PAIN PROTOCOL Step # Medication (50 g/ml) # Micrograms Sublingually 1Fentanyl50 2Sufentanil25 3Sufentanil50 4Sufentanil100 (see also
fentanyl or sufentanil is administered SL 10 min. prior to anticipated activity repeat q 10min x 2 additional doses if needed increase to next step if 3 total doses not effective physician order required to increase to next step if within an hour of last dose the Incident Pain Protocol may be used up to q 1h prn INCIDENT PAIN PROTOCOL ctd...