MPT Electrophysiology and Wound Care 2

Question 1

TENS achieves pain relief via the gate control theory primarily through which mechanism?

Accepted Answer

Activating large-diameter A-beta mechanoreceptor fibers to inhibit nociceptive transmission at the dorsal horn

Answer

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.

Question 2

Therapeutic ultrasound at 3 MHz is preferred over 1 MHz for treatment of which tissue location?

Accepted Answer

Superficial tendons and bursae (less than 2 cm depth)

Answer

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.

Question 3

A pressure injury that appears as a full-thickness wound with visible fat but no bone, tendon, or muscle is classified as:

Accepted Answer

Stage 3

Answer

Stage 3 pressure injuries involve full-thickness skin loss with visible subcutaneous fat, but bone, tendon, or muscle is not exposed or palpable.

Question 4

Which parameter of NMES most directly determines the depth of muscle recruitment?

Accepted Answer

Intensity (amplitude)

Answer

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.

Question 5

Autolytic debridement of a wound is achieved by which mechanism?

Accepted Answer

Maintaining a moist wound environment with occlusive dressings, allowing endogenous enzymes to liquefy necrotic tissue

Answer

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.

MPT - Master of Physical Therapy Practice Test

MPT - Master of Physical Therapy Practice Test

MPT Electrophysiology and Wound Care 2