title: [Calculation of underwater decompression schedule for the simulated 100 m Trimix conventional diving and verification of the schedule with animal experiment].
abstract: OBJECTIVE
  To explore the underwater decompression schedule for 100 m Trimix conventional diving operations and evaluate its safety through a simulated rabbits Trimix conventional diving.
  
  
  METHODS
  According to the Haldane theory, the assumed time units, the classification of tissue compartments, the nitrogen super-saturation safety coefficient and the selection of methods used for the calculation of the simulated 100 m Trimix conventional diving schedule were properly selected, and the calculating method for the dive decompression schedule was thus firmly established. In our experiments, five tissue compartments were selected during the calculation of decompression schedule: 5 min, 10 min, 20 min, 40 min and 75 min, and the nitrogen super-saturation safety coefficient was calculated by 1.6. Eight New Zealand rabbits were performed a simulated 100 m Trimix dive program which was established according to the Haldane theory, and eight rabbits for intact group. The tissues wet/dry ratio and ethology were detected and observed before and after the simulated diving to evaluate the safety of decompression schedule.
  
  
  RESULTS
  By using the developed underwater decompression schedule, abnormal ethology changes in rabbits could not be observed after compression and decompression to the surface; and the tissues wet/dry ratio of simulated diving rabbits had no significant changes compared with the intact group (P > 0.05).
  
  
  CONCLUSIONS
  The decompression schedule calculated by Haldane theory seemed to be safe and reliable, the diving breathing gas concentration did not cause oxygen toxicity and nitrogen narcosis among the dive rabbits, and dive efficiency was greatly improved by using enriched oxygen gas in UPTD safety range during decompression.
authors.forename: Yang-yang
authors.initials: YY
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Shi
authors.forename: Yan-meng
authors.initials: YM
authors.lastname: Zhang
authors.forename: Chan-juan
authors.initials: CJ
authors.lastname: Xiao
authors.forename: Hong-tao
authors.initials: HT
authors.lastname: Liu
mesh_terms: D032761:Animal Experimentation; D000818:Animals; D003664:Decompression; D004242:Diving; D006371:Helium; D009584:Nitrogen; D010100:Oxygen; D011817:Rabbits
chemical_list: D006371:Helium; C045257:trimix; D009584:Nitrogen; D010100:Oxygen