Accession Number:

ADA550047

Title:

Work of Breathing Limits for Heliox Breathing

Descriptive Note:

Technical rept. Oct 2009-Sep 2010

Corporate Author:

NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL

Personal Author(s):

Report Date:

2010-11-01

Pagination or Media Count:

33.0

Abstract:

The purpose of the present report was to determine physiologically acceptable limits for work of breathing with heliox mixtures. The basis for the development was the limits for air breathing that Navy Experimental Diving Unit NEDU implemented in 2008. Two ways of converting the air limits to heliox were considered empirical changes in breathing capacity and calculations of equivalent gas density. The reasons for choosing changes in breathing capacity are discussed. Limits are presented for diving with fixed concentrations of oxygen e.g., open circuit diving and fixed partial pressure of oxygen e.g., electronic rebreathers. Tables give limits for common gas mixtures or ways to calculate the limits for custom gas mixtures. The results are compared to those from previous tests at NEDU. No restrictions will be put on existing equipment. Rather, in some situations the limits will increase, a result making the advantages of heliox increasingly obvious.

Subject Categories:

  • Life Support Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE