ATC Therapeutic Modalities 2 — Questions and Answers
Question 1: Hot packs transfer heat to the body primarily through which mechanism?
- Convection
- Radiation
- Conduction (Correct answer)
- Evaporation
Correct answer: Conduction
Hot packs transfer heat through conduction, which is the direct transfer of heat from one object to another through physical contact.
Question 2: What is the recommended temperature range for a therapeutic warm whirlpool used for general extremity treatment?
- 95°F-98°F (35°C-36.7°C)
- 98°F-102°F (36.7°C-38.9°C)
- 102°F-110°F (38.9°C-43.3°C) (Correct answer)
- 110°F-120°F (43.3°C-48.9°C)
Correct answer: 102°F-110°F (38.9°C-43.3°C)
The recommended temperature for a therapeutic warm whirlpool for extremity treatment is 102°F-110°F (38.9°C-43.3°C).
Question 3: Interferential current (IFC) therapy typically uses which carrier frequency?
- 1-10 Hz
- 50-80 Hz
- 4,000 Hz (Correct answer)
- 100,000 Hz
Correct answer: 4,000 Hz
Interferential current therapy uses a carrier frequency of approximately 4,000 Hz (4 kHz), with two slightly different frequencies creating a therapeutic beat frequency in the target tissue.
Question 4: In pulsed ultrasound with a 20% duty cycle, what does this signify?
- The ultrasound is on for 20% of the total treatment time (Correct answer)
- The intensity is 20% of continuous output
- The frequency is set at 20 Hz
- The transducer moves at 20 cm/s
Correct answer: The ultrasound is on for 20% of the total treatment time
A 20% duty cycle means the ultrasound is active for 20% of the total pulse period, reducing the average heating effect while maintaining mechanical effects.
Question 5: Phonophoresis combines therapeutic ultrasound with which additional treatment?
- Electrical stimulation
- Cryotherapy application
- Topical medication delivery (Correct answer)
- Mechanical traction
Correct answer: Topical medication delivery
Phonophoresis uses ultrasound energy to drive topical medications such as corticosteroids or anti-inflammatory agents transdermally into underlying tissues.
Question 6: Which of the following is a contraindication for the use of moist heat packs?
- Chronic muscle tension
- Subacute injuries after 72 hours
- Acute injuries within 24-72 hours (Correct answer)
- Decreased range of motion
Correct answer: Acute injuries within 24-72 hours
Moist heat packs are contraindicated for acute injuries within 24-72 hours because heat increases blood flow, which can worsen acute inflammation and edema.
Question 7: Iontophoresis requires which type of electrical current to drive ions into tissue?
- Alternating current (AC)
- Pulsed biphasic current
- Direct current (DC) (Correct answer)
- Interferential current
Correct answer: Direct current (DC)
Iontophoresis utilizes direct current (DC) because its unidirectional flow creates a consistent polarity needed to push like-charged ions into the tissue.
ATC Therapeutic Modalities 2
Hot packs transfer heat to the body primarily through which mechanism?