Agents Intro

Agents

Introduction

Basic Science of Therapeutic Modalities

• Energy:

  • Defined as the capacity of a system for doing work.

  • Neither created nor destroyed; typically transformed from one form to another.

  • Different forms of energy affect biological tissues differently.

  • Can be transferred via various modes: conduction, convection, movement of photons, or electric fields.

• Different forms of energy:

  • Electromagnetic

  • Thermal

  • Electrical

  • Sound

Electromagnetic Energy

• Radiation:

  • Process by which electromagnetic energy travels from its source outward, carried by photons.

• Modality forms:

  • Shortwave Diathermy

  • Microwave diathermy

  • Infrared Lamps

  • Ultraviolet Therapy

  • Photobiomodulation Therapy (LASER, LED, light therapy)

Thermal Energy

• Operates on the concept of conduction.

• Tissue temperature change depth is at most 1 cm, either hot or cold.

• Modality forms:

  • Ice pack

  • Hot Pack

  • Cold/hot whirlpool

Electrical Energy

• Associated with the flow of electrons or charged particles through an electric field.

• Effects vary from thermal, chemical, or physiologic.

• Modality forms:

  • Iontophoresis

  • Electrical Stimulation

  • Electromyographic (Biofeedback)

Sound Energy

• Acoustic energy consists of pressure waves due to mechanical vibration of particles.

• Modality forms:

  • Ultrasound

  • Extracorporeal Shock Wave Therapy

Mechanical Energy

• An object that supplies the force to do work.

• Mechanical energy modalities:

  • Massage

  • Intermittent compression

  • Traction

  • Mechanical vibration

Clinical Based Practice

• External clinical evidence replaces previously accepted clinical techniques and treatments with more appropriate ones.

• Emphasis on patient-centered care and positive outcomes (i.e., POLICE > RICE).

Evidence-Based Practice

• Steps in determining efficacy of therapeutic modalities:

  1. Develop a clinical question.

  2. Search the literature for the best evidence.

  3. Evaluate strength of the evidence.

  4. Apply best-available evidence to specific patient needs.

  5. Assess outcome or treatment effectiveness.

Using Therapeutic Modalities to Affect the Healing Process

Trauma and Reinjury Risks

• Risks associated with returning to activity prematurely:

  • Greater risk of reinjury

  • Presence of hematoma

• Primary Injury:

  • Blood and damaged tissue.

• Secondary Response:

  • Scab formation and edema.

  • Hypoxic damaged tissue and bleeding.

• Inflammation:

  • Pain, guarding, and less than optimal recovery.

Repair Phases

• Inflammation Phase

• Fibroplastic Phase

• Maturation Phase

• Outcomes to address:

  • Reduced risk of reinjury

  • Proper rehabilitation

  • Return to full activity and optimal recovery

Factors Influencing the Healing Process

• Extent of injury (micro tear vs. microtear)

• Edema and hemorrhage

• Poor vascular supply

• Separation of tissue and muscle spasms

• Other factors: corticosteroids, keloids, infection, climate, health, age, and nutrition.

Immediate Modality Use

• POLICE method is the gold standard over RICE.

• Alternate modalities include:

  • LASER therapy

  • LED therapy

  • Electrical Stimulation

  • Kinesio Tapping

  • Anti-inflammatory Medications

• Caution against interfering with the healing process too much as it may delay recovery.

Modality Use in Inflammatory-Response Phase

• Avoid heating too early; can worsen the problem.

• Focus on modalities with non-thermal physiologic effects.

• Any modality increasing pain/swelling should be stopped.

• Anti-inflammatory medicines may be introduced.

• Available modalities include:

  • Non-thermal ultrasound

  • LASER therapy

  • LED therapy

  • Intermittent Compression

Chronic Inflammation

• Patients with chronic conditions might not transition smoothly from inflammation.

• Focus on blood supply, tissue regeneration, and lymphatic drainage.

• Modalities for use:

  • Shortwave diathermy

  • LASER therapy

  • Ultrasound therapy

  • Extracorporeal shockwave therapy

Modality Use in Fibroblastic-Repair Phase

• Use thermotherapy and thermal modalities to enhance circulation and improve range of motion (ROM).

• Lymphatic drainage and muscle activation/strengthening are crucial.

• Modalities include:

  • Thermotherapy

  • Thermal ultrasound

  • Shortwave diathermy

  • Electrical stimulation

  • Intermittent Compression

  • Manual therapy

Modality Use in Maturation-Remodeling Phase

• All modalities are generally safe, but not all are clinically appropriate.

• Goals: realign and strengthen collagen fibers within comprehensive rehabilitation.

• Agents include:

  • All thermal agents

  • Electrical stimulation for pain or strengthening

  • Manual therapy

Importance of Variability

• Adaptability to external stimuli is important in treatment planning.

• Physiological effects vary by modality and must be understood before administration.

• Vary treatment and rehab plans daily to optimize effects.

Understanding Pain

• Pain serves as a warning signal for injury and can trigger withdrawal response.

• Persistent pain may limit activities and functioning.

• Pain classifications can be nociceptive, nociplastic, neuropathic, psychosocial, or motor; none are independent.

• Pain is subjective and characterized by multiple descriptors.

Pain Terminology

• Acute pain or nociceptive pain: Caused by tissue damage after injury.

• Chronic pain: Lasts over 6 months, may have no clear cause.

• Persistent pain: Treatable and modifiable symptom.

• Referred pain: Perceived in a different area from the source (e.g., Kehr's sign).

• Radiating pain: Distal pain along an affected nerve caused by nerve irritation.

Assessing Pain

• Pain assessment is subjective and varies by individual.

• Assessment tools include:

  • Numeric Pain scale

  • Visual analog scale

  • Pain charts

  • McGill Pain Questionnaire

  • Activity Pattern Indicators Pain Profile

Nociceptive Pain

• Results from the stimulation of peripheral receptors following injury.

Types of Sensory Receptors

• Mechanoreceptors: Respond to pressure (e.g., Meissner's corpuscle, Pacinian corpuscle).

• Proprioceptors: Detect tension and muscle length changes (e.g., muscle spindles, Golgi tendon organs).

• Nociceptors: Respond to pain stimuli.

• Thermoreceptors: React to temperature changes.

Neural Transmission

• Afferent fibers: Transmit impulses towards the brain.

• Efferent fibers: Transmit impulses from the brain peripherally.

• Pain information travels from nociceptor to dorsal horn of the spinal cord, then to the brain.

Thalamus

• Processes all senses except smell.

• Involved in consciousness, learning, and memory.

Periaqueductal Gray (PAG)

• Key in pain perception and responses.

• Associated with chronic pain development.

Diameter and Conduction Velocity of Nerve Fibers

• Details regarding sensor nerve classification, conduction velocity, and receptor types.

Facilitators and Inhibitors of Synaptic Transmission

• Mediators: Serotonin, norepinephrine, GABA, affecting pain transmission.

• Glutamate facilitates pain signals, while GABA inhibits it.

Nociception

• The process by which pain is perceived; initiated by tissue injury and chemical mediators.

Gate Control Theory of Pain

• Explains how non-nociceptive stimuli can inhibit pain transmission.

• Illustrates the interaction between A-beta fibers and pain fibers.

Descending Pain Control

• Expands the Gate Control Theory, involving input from higher centers to modulate pain perception.

Beta-Endorphin and Dynorphin in Pain Control

• Opioid peptides naturally produced in the body that play a role in pain management.

General Use of Physical Agents

• Can alleviate pain from different origins, decrease pain fiber transmission, and stimulate endogenous opioids.

More Useful Pain Control Strategies

• Emphasize patient education, encourage self-care, enhance communication, and minimize tissue damage.