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. No-stop-time, decompression time, and
if necessary decompression 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