6
I Introduction
3 Calculation Model ZH-L8 ADT
• Gross disregard of the ascent rate, exceeding the
decompression depth and repeated ascents to the
surface (yoyo dives), can all cause microbubbles to
form on the arterial side and in tissues. Where the
bubbles partially impair circulation, the rate of gas
diffusion and the saturation tolerance are changed.
Decompression time, and if necessary decom-
pression depth, are adjusted so that existing
bubbles stop growing. In addition, altered
decompression assures that the tissue desaturates
sufficiently if microbubbles impair circulation locally.
• The calculation of the gas bubbles results in a new
ascent instruction. The ascent rate near the surface
is reduced down to 7m/min. This prevents with
high reliability the formation of microbubbles in
the arterial circulation and minimizes the formation
of microbubbles in the venous circulation after the
dive.
3.2 Advantages
On first dives with correct diving technique and
avoiding risk situations, there are no extended
decompression times. On the other hand, it is possible
to react correctly in risk situations due to the realistic
simulation of the physiological processes in the body.
This increases safety considerably. Risk situations are,
for example:
• Repetitive dives (especially with short intervals) and
dives on several successive days
• Dives in cold water
• Yoyo dives
• Flying after the dive
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