Electrophysiology and Wound Care Flashcards
6 cards from real MPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrophysiology and Wound Care flashcards as text
TENS achieves pain relief via the gate control theory primarily through which mechanism?
Answer: Activating large-diameter A-beta mechanoreceptor fibers to inhibit nociceptive transmission at the dorsal horn
Conventional TENS activates large A-beta sensory fibers which activate inhibitory interneurons in the dorsal horn, gating (inhibiting) nociceptive transmission from smaller A-delta and C-fibers.
Therapeutic ultrasound at 3 MHz is preferred over 1 MHz for treatment of which tissue location?
Answer: Superficial tendons and bursae (less than 2 cm depth)
3 MHz ultrasound is absorbed in superficial tissues (less than 2 cm) due to higher frequency causing faster energy attenuation, making it ideal for treating superficial structures like tendons and bursae.
A pressure injury that appears as a full-thickness wound with visible fat but no bone, tendon, or muscle is classified as:
Answer: Stage 3
Stage 3 pressure injuries involve full-thickness skin loss with visible subcutaneous fat, but bone, tendon, or muscle is not exposed or palpable.
Which parameter of NMES most directly determines the depth of muscle recruitment?
Answer: Intensity (amplitude)
Intensity (amplitude) most directly determines the depth and breadth of motor unit recruitment. Increasing amplitude depolarizes more deeply located motor nerve fibers, recruiting deeper motor units.
Autolytic debridement of a wound is achieved by which mechanism?
Answer: Maintaining a moist wound environment with occlusive dressings, allowing endogenous enzymes to liquefy necrotic tissue
Autolytic debridement uses the body's own proteolytic enzymes and macrophages, maintained at the wound surface by moisture-retentive dressings, to selectively liquefy and remove necrotic tissue.
Iontophoresis using dexamethasone (negative pole/cathode) is most commonly used to treat which condition?
Answer: Inflammatory conditions such as lateral epicondylitis, plantar fasciitis, and bursitis
Dexamethasone is negatively charged and is repelled by the cathode (negative pole), driving the anti-inflammatory medication into superficial inflammatory conditions like tendinopathies and bursitis.