Comfort & Pain

Pain Definition and Purpose

• Definition: An unpleasant sensory and emotional experience associated with actual or potential tissue damage.

• Pain is: A physical/emotional experience, symptom, and warning system.

• Purpose: Mainly protective, motivating individuals to seek help.

Origin and Causes of Pain

• Origin:

  • Cutaneous (superficial): Skin or subcutaneous tissue (e.g., paper cut).

  • Deep somatic: Ligaments, tendons, bones, blood vessels, nerves (e.g., sprain, fracture).

  • Visceral: Internal organs (thorax, cranium, abdomen) (e.g., organ cancer, menstrual cramps).

• Causes:

  • Physical: Identifiable physical injury (e.g., broken bone).

  • Psychogenic: No identifiable physical cause.

Types of Pain (Duration, Location, Etiology)

• Duration:

  • Acute: Sudden/slow onset, mild to severe, up to $6$ months, protective, subsides with healing.

  • Chronic: Lasts $6$ months or longer, limits everyday functioning.

  • Intractable: Highly resistant to relief (e.g., advanced malignancy).

• Location:

  • Radiating: Felt at source and extends to nearby tissues (e.g., cardiac pain to chest, arm, jaw).

  • Referred: Felt distant from the tissue causing pain (e.g., kidney pain along thigh, heart attack as abdominal discomfort in women).

• Etiology (Cause):

  • Neuropathic: Complex, chronic pain from injury to peripheral or central nervous system, repeated pain signals even without stimuli.

    • Peripheral Syndromes: Causalgia, post-herpetic neuralgia, phantom limb pain.

    • Central Syndromes: Thalamic syndrome (post-stroke), trigeminal neuralgia.

    • Underlying Pathology Syndromes: Musculoskeletal, myofascial, intervertebral disc, arthritis, headache, cancer pain.

Physiology of Pain (Nociception)

• Nociception: The process of pain perception, involving four stages:

  • A. Transduction: Tissue injury stimulates nociceptors (peripheral nerve fibers).

  • B. Transmission: Pain signals travel from peripheral nerves $\to$ spinal cord $\to$ thalamus $\to$ cortex/brain.

  • C. Perception: Patient becomes conscious of pain.

  • D. Modulation: Brain stem sends signals down spinal cord, potentially blocking pain perception.

Gate Control Theory of Pain Modulation

• Describes how pain sensation is perceived by the interplay between pain-producing fibers (C) and pain-inhibiting fibers (A Delta).

• Gate Open: With body injury/pain.

• Gate Closed: With stimulation (e.g., massage) after pain response, decreasing pain impulses to the brain.

• Interventions to alter perception: Teaching, distraction, touch/massage, pain medication, TENS unit, imagery, relaxation techniques.

Pain Experience & Factors Affecting It

• Pain Sensation: Stimuli perceived as pain.

• Pain Reaction: "Fight or flight" response, pain fibers sensitize, intensifying and spreading pain.

• Pain Threshold: Least stimuli needed to label sensation as pain.

• Pain Tolerance: Maximum amount and duration of pain an individual is willing to endure.

• Factors Affecting Pain Experience:

  • Fear, fatigue, lack of knowledge.

  • Culture, ethnic variables (response to pain differs).

  • Environment, support people, physical/psychological factors.

  • Developmental factors (age).

Assessment of Pain (Fifth Vital Sign)

• Key Questions:

  • Location: Where is the pain? Ask to point.

  • Onset and Duration: How long has it lasted?

  • Intensity/Severity: Use a scale ($0-10$), words (mild, moderate, severe).

  • Quality: Describe what it feels like (crushing, burning, dull, sharp).

  • Associated Characteristics: Visual disturbances, nausea, depression, muscle spasms.

  • Behavioral Responses: Rubbing, position changes, pacing, grimaces, verbalizations.

  • Affective Responses: How does it make you feel? How does it interfere with life?

  • Perception and Coping: Meaning of pain, adaptive mechanisms.

• PQRST Assessment Mnemonic:

  • P: Provocative/Palliative (What causes/relieves it?)

  • Q: Quality (What does it feel like?)

  • R: Region/Radiation (Where is it? Does it radiate?)

  • S: Severity (On a $1-10$ scale).

  • T: Time (When did it start? How long does it last?)

Nursing and Pharmacologic Interventions

• Nursing Interventions (Independent): Therapeutic touch, massage, quiet/dark room, music, imagery, distractions.

• Medical Interventions (Dependent, requires order): Medications, acupressure, acupuncture, TENS unit, heat/ice packs.

• Pharmacologic Pain Management:

  • Opioid (Narcotic) Analgesics (e.g., Morphine, Dilaudid): Acts in CNS for moderate-severe pain. Side effects: constipation (common), respiratory depression (dangerous).

  • Non-Opioid Analgesics (e.g., Acetaminophen/Tylenol): Analgesic, antipyretic. Uses: mild-moderate pain. Risk: hepatotoxicity.

  • NSAIDs (e.g., Advil, Motrin): Anti-inflammatory, analgesic, antipyretic. Uses: fever, musculoskeletal pain. Side effects: GI bleeding, kidney damage. Avoid aspirin.

  • Opioid and Non-opioid Combinations (e.g., Lortab): Treats moderate-severe pain, affects CNS and peripheral pathways.

  • Adjuvant Analgesics (Co-analgesics) (e.g., Valium, Vistaril): Medications that assist in controlling pain when combined with an analgesic.

Nursing Process for Pain

• Nursing Diagnosis: Pain, acute or chronic r/t tissue damage or nerve injury AMB (patient states pain level and location).

• Goal: Patient will state pain is at level of $3/10$ $30$ min after pain intervention.

• Evaluation: Patient stated pain level decreased to $4/10$ $30$ min after intervention (document response).