Pain Assessment: The Fifth Vital Sign Flashcards

Learning Objectives for Pain Assessment

• Apply subjective assessment skills to identify and evaluate a patient's pain experience.
• Apply objective assessment skills to observe physical manifestations of pain.
• Integrate an inclusive approach to pain assessment, accounting for cultural, social, and developmental differences.

Introduction to the Nature of Pain

• Pain is defined as a complex phenomenon that is subjective and unique to every individual.
• To understand pain, healthcare providers must understand its nature and how it affects each person differently.
• Clinical practice requires considering the individual's personal history and their last experience with pain to contextualize the assessment.

Conceptualizing Sources and Types of Pain

• Neuropathic Pain
  • Verbatim Definition: Defined as pain "initiated or caused by a primary lesion or dysfunction (or disease) of the somatosensory nervous system."
  • Cause: This type of pain is caused by injury to either the peripheral nervous system, the central nervous system, or both.
  • Clinical Challenges: It is considered a challenging problem because the pain can be extremely severe and notoriously difficult to manage.
• Nociceptive Pain
  • Definition: Pain that occurs due to tissue injury.
  • Progression: This pain usually resolves as tissue healing takes place.
  • Characteristics: It is typically well-localized and often described by patients as aching or throbbing.
  • Classification: Nociceptive pain is further classified into somatic or visceral categories.
• Nociplastic Pain
  • Definition: Pain originating from altered nociception with unclear evidence of actual or potential tissue damage.
  • Associations: This is a new classification of pain associated with chronic conditions such as fibromyalgia or irritable bowel syndrome (IBS).
• Idiopathic Pain
  • Definition: Pain of an unknown origin where there is no obvious pathology or identifiable cause.

Specific Classifications of Pain Origin

• Visceral Pain
  • Origin: Pain that originates from larger interior organs such as the stomach, intestine, pancreas, or bladder.
  • Triggers: The pain can stem from direct injury or stretching of the organ.
  • Examples: Ureteral colic, acute appendicitis, ulcer pain, and cholecystitis.
  • Transmission: It is transmitted by ascending nerve fibres along with nerve fibres of the autonomic nervous system.
  • Autonomic Responses: Because of the autonomic involvement, it often presents with physical symptoms such as vomiting, nausea, pallor, and diaphoresis.
• Deep Somatic Pain
  • Origin: Pain derived from blood vessels, joints, tendons, muscles, and bone.
  • Triggers: Injury may result from pressure, trauma, or ischemia.
• Cutaneous Pain
  • Origin: Pain derived from the skin surface and subcutaneous tissues.
  • Characteristics: The injury is superficial, and the sensation is described as sharp or burning.
• Referred Pain
  • Definition: Pain that is felt at a particular site but originates from another location.
  • Mechanism: Both the site of origin and the site of felt pain are innervated by the same spinal nerve. The brain finds it difficult to differentiate the exact point of origin.
  • Biological Basis: Human brains have no felt image for internal organs. Pain is referred to a site where the organ was located during fetal development. As the organ migrates during development, its nerves persist in referring sensations from the former location.

Acute versus Persistent (Chronic) Pain

• Acute Pain
  • Duration: Short term.
  • Nature: Predictable and usually follows a known trajectory (e.g., healing).
  • Primary Tool: Best assessed using the Numerical Rating Scale (NRS).
  • Examples: Post-operative surgical pain, trauma, and kidney stones.
  • Clinical Considerations: May cause changes in Heart Rate (HR) and Blood Pressure (BP). It can lead to insufficient coughing or deep breathing, resulting in hypoventilation and hypoxia. It is also associated with joint stiffness, increased healing time, nausea, vomiting ($N/V$), and pruritus.
• Persistent or Chronic Pain
  • Duration: Lasts for $6$ months or longer.
  • Nature: Pain that persists after the initial acute phase of an injury or illness has passed.
  • Classification: Differentiated as Malignant (cancer-related) versus Non-Malignant.
  • Examples: Pain from a tumour, or musculoskeletal conditions like arthritis and fibromyalgia.
  • Clinical Considerations: Requires timing activities with pain management. Providers must evaluate if pain impacts the patient's quality of life and if the patient has adequate support for Activities of Daily Living (ADLs).

Detailed Assessment of Neuropathic Pain

• Pathology: Results from damage along the nerve pathway.
• Descriptors: Burning, shooting, or lancinating sensations.
• Diurnal Pattern: Often becomes more intense at night.
• Common Examples: Herpes zoster (shingles), spinal cord injuries, and diabetes.
• Objective Inspection Findings: Assess tissue for color, swelling, or masses. Look for lesions, wounds, or changes in hair distribution.
• Sensory Changes: Patients may experience hyperesthesia ($hi$ sensation) or numbness.

The Timing and Frequency of Pain Assessment

• Pain as "The Fifth Vital Sign": Pain is regarded with the same clinical importance as temperature, pulse, respiration, and blood pressure. It should be incorporated into every vital sign assessment.
• Essential Assessment Points:
  • Upon admission to a facility.
  • During every primary healthcare visit.
  • At the start of every shift.
  • Whenever there is a change in the client's condition.
  • Prior to any procedure or physical activity.
  • After the administration of treatment.
  • When there is a written order for pain assessment.
• Evaluation: Reassessment should occur at suitable intervals after each pharmacological or non-pharmacological intervention to evaluate effectiveness. Findings must be compared to the patient's baseline.
• Warning Sign: Sudden changes in pain may signify a new underlying pathological process.

Subjective Assessment and Communication

• Self-Report: This is the gold standard of assessment. Pain is whatever the client tells you it is, existing whenever they say it does.
• Provider Bias: Clinicians must understand and address their own personal biases.
• Cultural Humility: An inclusive approach is necessary to understand the unique meaning of a patient’s pain within their cultural context.

Standardized Pain Assessment Tools

• Numerical Rating Scale (NRS): A scale from $0$ to $10$, where $0$ is "No pain," $5$ to $7$ is "Moderate pain," and $10$ is "Worst pain."
• Visual Analogue Scale (VAS): A visual tool for patients to indicate pain intensity along a continuous line.
• Faces Pain Scale-Revised (FPS-R):
  • Intended Use: Designed for children or those with communication difficulties.
  • Instructions: Point to faces and explain: "This face [left-most] shows no pain. The faces show more and more pain up to this one [right-most] - it shows very much pain." Avoid using terms like "happy" or "sad" because the scale measures internal feeling, not facial expression.
  • Scoring: Faces are scored as $0, 2, 4, 6, 8, \text{ or } 10$.
• Universal Pain Assessment Tool: Combines the $0$ to $10$ scale with verbal descriptors (Mild, Moderate, Severe), the Wong-Baker Facial Grimace Scale, and an Activity Tolerance Scale (ranging from "Interferes with tasks" to "Bedrest required").
• Brief Pain Inventory (BPI): A multidimensional tool originally developed for cancer but now used for post-op and chronic pain.
• Abbey Pain Scale: An observational tool used specifically for clients with cognitive impairment.
• FLACC Pain Tool:
  • Acronym: Face, Legs, Activity, Cry, Consolability.
  • Revised version: Includes additional behavioural descriptors for clients with cognitive impairment.

The OPQRSTUV Assessment Framework

• O - Onset: When did the pain start?
• P - Provocative/Palliative: What makes the pain worse? What makes it better?
• Q - Quality: What does the pain feel like? (e.g., sharp, dull, burning).
• R - Region/Radiation: Where is the pain? Does it spread anywhere else?
• S - Severity: How bad is the pain on a scale of $0$ to $10$?
• T - Timing: Is the pain constant, intermittent, or occasional?
• U - Understanding: What does the patient believe is causing the pain? How is it impacting them and their family? What is their goal for the pain? What medications/therapies have been used?
• V - Values: What is the patient's acceptable level for this pain? Is there anything else they want to say? Are there other symptoms related to the pain?

Objective Data and Physical Findings

• Musculoskeletal Signs: Swelling, inflammation, injury, deformity, or diminished range of motion.
• Crepitation: An audible and palpable crunching that accompanies movement.
• Palpation: Note any increased pain when touching an area.
• Integumentary Signs: Bruising, lesions, open wounds, tissue damage, atrophy, bulging, or changes in hair distribution.
• Abdominal Signs: Swelling, bulging, herniation, inflammation, or organ enlargement.

Physiological Responses to Uncontrolled Pain

• Cardiac: Tachycardia, elevated blood pressure, increased myocardial oxygen demand, and increased cardiac output.
• Pulmonary: Hypoventilation, hypoxia, decreased cough, and atelectasis (collapsed lung).
• Gastrointestinal: Nausea, vomiting, and ileus (intestinal obstruction).
• Renal: Oliguria (low urine output) and urinary retention.
• Musculoskeletal: Spasms and joint stiffness.
• Endocrine: Increased adrenergic activity.
• Central Nervous System: Fear, anxiety, and fatigue.
• Immune: Impaired cellular immunity and impaired wound healing.
• Persistent Pain Effects: Depression, social isolation, limited mobility/function, and confusion.

Nonverbal and Behavioral Pain Indicators

• Physical Actions: Rocking, guarding, rubbing the painful area, or bracing the body.
• Facial Expressions: Frowning, grimacing, or a flat affect.
• Vocalizations: Moaning or other negative vocalizations.
• Emotional/Cognitive: Irritability, agitation, restlessness, or decreased interaction.
• Physiological/Autonomic: Noisy breathing, diaphoresis (sweating), or changes in vital signs.
• Functionality: Stillness, decreased intake (food/water), and altered sleep patterns.

Social, Cultural, and Developmental Considerations

• Cultural Assessment Questions:
  • What traditional remedies have you tried to help you with your pain?
  • How do you usually behave when you are in pain? How would others know?
  • Do you have family and friends who help you because of your pain? If so, who?
• Neonatal Considerations:
  • Assessment is based entirely on behavioural and physiological cues.
  • Infants are capable of feeling pain; preterm neonates are significantly more sensitive to pain.
  • Monitor changes in vital signs, temperament, expression, and activity.
  • Use validated tools like the Premature Infant Pain Profile (PIPP).
• Intellectual and Cognitive Disability:
  • Patients with stroke, dementia, or Parkinson’s may not be able to communicate pain verbally.
  • A head-to-toe assessment is vital.
  • Confusion and delirium may be signs of poor pain control.
  • Watch for changes in daily activities and behavioral cues.