Precaution should be taken when using therapeutic ultrasound on patients with hem-
orrhagic diatheses.
Ultrasound treatment presents a potential safety hazard in patients whose pain
response has been decreased because of disease, previous surgery, ionizing radiation
therapy, chemotherapy, general or regional anaesthesia. It may cause burns. Do not
use on insensitive areas or in the presence of poor circulation.
Large thermal doses may result in regions of thermal aseptic necrosis which may not
be apparent on inspection of the skin.
See also chapter 3, Precautionary Instructions, for general Warnings and Precautions.
28
4.2.3 Precautions and Warnings Ultrasound
Use of ultrasound in treating areas above the shoulders may pose relevant hazards.
While it is recognized that certain specific conditions involving the eyes can and have
been treated by specialists qualified by training, knowledge and experience to admin-
ister such treatments, such application carries with it recognized hazards of applying
heat to the eyes.
Treatment of the facial sinus exposes the eyes to the same hazards.
Treatment of the thyroid, as well as lymph nodes in the neck, may expose the patient
to as yet undetermined effects, in as much as the safety of such treatments has not yet
been established.
4.2.4 Relevant Hazards Ultrasound
Cataracts. Male sterility.
Enhanced drug activity. Thermal stress.
4.2.4 Relevant Hazards Ultrasound
4.2.4 Relevant Hazards Ultrasound
Ultrasound Frequency: expressed in MHz, is the frequency of the ultrasound waves. The
ultrasound frequency determines the penetration depth, which has the largest value at 1
MHz. The ultrasound frequency can be set at 1 MHz or 3 MHz.
Duty Cycle: expressed in %, defines the ratio of the pulse duration to the pulse repetition
time. Ultrasound can be applied in pulsed or in continuous mode. When the Duty Cycle is
set to 100%, the apparatus operates in continuous mode.
Rehab-Series
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