Accident Caused by Snow Avalanche
Conditions
Keywords
snow, avalanche, hypercapnia, work of breathing
Brief summary
The aim of the study is to investigate respiratory parameters of a person in the simulated avalanche snow and consequent use of the measured data for development of a mathematical-physical model of breathing during increasing hypercapnia in the avalanche.
Detailed description
The study is a part of a university research project aimed at studying physiological conditions and development of breathing parameters of a person breathing in the simulated avalanche snow. Presence of an air pocket and its size play an important role in survival of victims buried in the avalanche snow. Even small air pockets facilitate breathing, yet they do not provide a significant amount of fresh air for breathing. The investigators hypothesize that the size of the air pocket significantly affects the airflow resistance and work of breathing. The aim of the study is to investigate the effect of the air pocket volume on gas exchange and work of breathing in subjects breathing into the simulated avalanche snow.
Interventions
OTHERBreathing in the simulated avalanche snow
Breathing in the simulated wet or dry avalanche snow with a small or large air pocket
Sponsors
Charles University, Czech Republic
Ministry of Defence and Armed Forces of the Czech Republic
Czech Technical University in Prague
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
DOUBLE (Subject, Investigator)
Eligibility
Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
Yes
Inclusion criteria
* healthy and fit volunteers, classified as The American Society of Anesthesiologists class I * without a smoking history
Exclusion criteria
* Tiffeneau Index less than 0.70 * any cardiovascular or respiratory condition
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The length of breathing | Continuously within 30 minute interval from the beginning of the breathing experiment | Time to termination of the breathing experiment due to the decision of the tested subject, or determined by high end-tidal carbon dioxide value or by the order by the clinician assessing the health status of the subjects. |
Countries
Czechia
Outcome results
None listed