Acral cold provocation test
The acral cold provocation is used for the differential diagnosis of circulatory disorders in the hands or feet.
Implementation and evaluation
The test is carried out standardized according to DIN ISO 14835-1 (2005-12).
After a cold water bath (12 ° C, 5 minutes) the fingertip temperature is measured for the following 25 minutes using temperature sensors or infrared thermography. A possible circulatory disorder can be diagnosed based on the rewarming process of the fingers :
- If a finger only reaches 28 ° C after 15 to 25 minutes, then this is a moderately delayed rewarming.
- One speaks of a strongly delayed rewarming if the finger has not yet reached 28 ° C after 25 minutes.
causes
One reason for the delayed rewarming of the fingers can be the many years of work with high-frequency vibrating equipment, e.g. B. be chain saws (see human vibration ). This chronic vibration disease was added to the list of occupational diseases in 1977 as white finger disease under the number BK 2104 " Vibration-related vasospastic syndrome (VVS)" . It is a special form of Raynaud's syndrome .
literature
- DIN ISO 14835-1 (2005-12): Mechanical vibrations and shocks - Cold provocation tests for assessing peripheral vascular function - Part 1: Measurement and evaluation of the skin temperature of the fingers (ISO 14835-1: 2005)