Pain Management What is it? Dr Ibraheem Bashayreh, RN, PhD 21/10/2009 1 Pain… What is the real definition of pain? And what is pain management?? How can this information help me??? 21/10/2009 2 21/10/2009 3 Pain Definitions: An unpleasant sensory and emotional experience associated with actual or potential tissue damage. Pain is whatever the experiencing person says it is. May not be directly proportional to amount of tissue injury. Highly subjective, leading to undertreatment 21/10/2009 4 Classification of Pain • 1. Acute • 2. Cancer • 3. Chronic non-malignant 21/10/2009 5 Acute Pain • Injury, trauma, spasm or disease to skin, muscle, somatic structures or viscera; • Perceived and communicated via peripheral mechanisms (pathways) A delta and C fibers • Usually with autonomic response as well (tachycardia, blood pressure, diaphoresis, pallor, mydriasis (pupil dilation); 21/10/2009 6 Acute Pain • Usually subsides quickly as pain producing stimuli decreases • Associated with anxiety-(decreases rapidly) • Can be understood or rationalized as part of the healing process. 21/10/2009 7 Chronic Pain • • • • Non-malignant Pain persists beyond the precipitating injury Rarely accompanied by autonomic symptoms Sufferers often fail to demonstrate objective evidence of underlying pathology. • Characterized by location-visceral, myofacial, or neurologic causes. 21/10/2009 8 Chronic Pain • Malignant • Has characteristics of chronic pain as well as symptoms of acute pain (breakthrough pain). • Has a definable cause, e.g. tumor recurrence • In treatment, narcotic habituation is generally not a concern. 21/10/2009 9 Types of Pain • • • • • • Somatic Visceral Referred Bone Neuropathic Emotional/Spiritual 21/10/2009 10 Somatic Pain • Aching, often constant • May be dull or sharp • Often worse with movement • Well localized • Skin, Muscle, Joints, superficial or deep. Eg: – Bone & soft tissue – chest wall 21/10/2009 11 Visceral Pain • • • • • Constant or crampy Aching, burning Poorly localized Referred Organs of Thorax & Abdominal Cavity. Usually as a result of stretching, infiltration and compression Eg/ – CA pancreas – Liver capsule distension –21/10/2009 Bowel obstruction 12 Types of Pain •Both Somatic & Visceral pain travel along the same pathways. Pain stimuli arising from the viscera is perceived as somatic in origin. This can be confused by the brain and is often described as referred pain. 21/10/2009 13 Liver Liver Heart Stomach Gallbladder Small Intestine Appendix Right Ureter 21/10/2009 Ovary Colon Kidney Bladder 14 Types of Pain • Bone Pain • Poorly localised, aching, deep, burning. • Common with Breast, Lung, Prostate, Bladder, Cervical, Renal, Colon, Stomach and Oesophagus • Can lead to pathological fractures. • Vertebral Metastases can lead to cord compression. 21/10/2009 15 Bone Pain • Osteoblasts, Osteoclasts and Osteocytes are involved in remodelling bone. • In healthy individuals bone remodelling is carefully regulated. • Normally Osteoblasts replace the same amount of bone which has been resorbed by the Osteoclasts. • In malignancy process not balanced, resulting in a loss of bone mass. 21/10/2009 16 Types of Pain • Neuropathic Pain • Caused by disturbance of function or pathological changes in a nerve. • May arise from a lesion or trauma, infection, compression or tumour invasion. • Described as burning, shooting, tingling. • Does not respond well to standard analgesics. 21/10/2009 17 Neuropathic Pain • Abnormal Sensations • Hyperaesthesia - an increased sensitivity to stimulation. • Hyperalgesia – increased response to a stimulus that is normally painful. • Allodynia – pain caused by a stimuli that is not normally painful 21/10/2009 18 Neuralgia Pain in the distribution of the nerve, lancing, shooting, jumping, electricity. Parasthesia An abnormal sensation, tingling, pins and needles. Tight Feeling Vice like tightness, gripping, cramping. 21/10/2009 19 Major Categories of Pain Classified by inferred pathophysiology: 1. Nociceptive pain (stimuli from somatic and visceral structures) 2. Neuropathic pain (stimuli abnormally processed by the nervous system) 21/10/2009 20 Effects of pain Sympathetic responses • Pallor • Increased blood pressure • Increased pulse • Increased respiration • Skeletal muscle tension • Diaphoresis 21/10/2009 21 Effects of pain Parasympathetic responses • Decreased blood pressure • Decreased pulse • Nausea & vomiting • Weakness • Pallor • Loss of consciousness 21/10/2009 22 FACTORS INFLUENCING PAIN • • • • • PHYSIOLOGICAL SOCIAL SPIRITUAL PSYCHOLOGICAL CULTURAL 21/10/2009 23 Pain Assessment • Pain History The site of pain Type of pain Exacerbating & Relieving factors How frequently Impact on daily life Previous therapies 21/10/2009 24 Pain Assessment •Factors to Consider Mood Non Verbal Communication Environment Ethnicity 21/10/2009 25 BOX 8-2 (continued) ASSESSMENT Concerns & Misconceptions • Pain is inevitable. • If the pain is worse, my cancer is spreading. • I should wait until I really need my pain killer, before I take it. • If I take Morphine I will die soon. • I will get addicted to pain killers. 21/10/2009 28 PAIN ASSESSMENT Tools • PAIN RATING SCALES- NRS, VAS,VAT,FACES RATING SCALE, • PAIN-0-METER • McGill PAIN QUESTIONNAIRE • BODY MAP 21/10/2009 29 Severity Assessment McGill Pain Questionnaire • 0 ----------> 5 • None -------------------> Excruciating • Mild, Discomforting, Distressing, Horrible, in between. • (for children or adults who understand numerical relationships) 21/10/2009 30 ABCDE for pain assessment &management • Ask about pain regularly • Believe the patient and family in their reports &what relieves it • Choose pain control options appropriate for the patient • Deliver interventions timely, logical &coordinated fashion • Empower patient and their families 21/10/2009 31 JCAHO Standards for postoperative pain management are: • Recognize patients’ rights to appropriate assessment and management of pain • Screen for pain and assess the nature and intensity of pain in all patients • Record assessment results in a way that allows regular reassessment and follow-up • Determine and ensure that staff are competent in assessing and managing pain. • Address pain assessment and management when orienting new clinical staff 21/10/2009 32 Standards Contd.. • Establish policies and procedures that support appropriate prescribing of pain medications • Ensure that pain doesn’t interfere with a patient’s participation in rehabilitation • Educate patients and their families about effective pain management 21/10/2009 33 Pain Treatment 21/10/2009 34 WHO Pain Management Ladder 3 By the Strong opioid +/- adjuvant 2 Clock, Mouth Weak opioid +/- adjuvant 1 Non-opioid +/- adjuvant 21/10/2009 35 WHO Pain Management Ladder Step 3 Step 2 Step 1 NSAIDS, + adjuvants 21/10/2009 NSAID + mild opioids + adjuvant strong opioids + NSAIDS + adjuvants 36 VAS vs WHO VAS 1-3 4-6 7 - 10 21/10/2009 WHO Steps Step 1 Step 2 Step 3 37 Analgesics Non-opioid Opioid e.g. aspirin, paracetamol e.g. codeine, morphine Adjuvant e.g. muscle relaxant, antidepressant, anti-epileptic 21/10/2009 38 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 21/10/2009 39 Opioid Side Effects • 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. 21/10/2009 40 Management contd.. Non-pharmacological interventions • Massage • Diversion therapy • Relaxation therapy • Heat & cold applications • Yoga 21/10/2009 41 Summary • Pain is a subjective experience and is influenced by many factors not just physical processes • The WHO pain ladder is recommended • Introduce drug therapy in stepwise manner, matching the initial analgesic to the level and type of pain • Other interventions, drug and non drug should be considered 21/10/2009 42 “Pain is a more terrible lord of mankind than death itself.” Albert Schweitzer 21/10/2009 43 When the music changes, so must the dance…. African Proverb 21/10/2009 44 21/10/2009 45