Advanced Dive Medicine Decompression and Bubble theory Flashcards Preview

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Flashcards in Advanced Dive Medicine Decompression and Bubble theory Deck (19):
1

At sea level how much tissue is saturated in equilibrium with nitrogen

1 Liter

2

Henry's Law describes

More inert gas is pushed into our tissues at depth . Absorption. Temperature, Depth, Duration, Work-rate

3

Ascend or return to the surface Henry's Law

Inert dissolved gas remaining in tissue is pushed out, too fast if you don't control the ascent causing bubbles.

4

JS Haldene

Published first Deco tables 1908

5

JS Haldene theory of fast tissues

Brain, Kidneys

6

JS Haldene theory of slow tissues

Bone, Cartilage, Adipose (fat)

7

JS Haldene theory of half times

Basis for REV 5 Deco table 12, Now 18 hour requirement with no repet designator

8

Tribonucleation

When bubbles become rapidly separated they become viscous (cavitation) Joints cracking

9

Reynolds Cavitation/Bernoulli priniciple

Liquid encounters an obstruction (heart valves) acts like rapids in a river

10

Seed bubbles

Pre-existing bubbles become bigger

11

De Novo

Latin from nothing - water requires -1400 atm to form vapor bubbles

12

Temperature and off gassing

Too warm gas leaves solution before it can diffuse
Too Cold gas is slow to leave solution and to match ambient pressure

13

Supersaturation

Isobaric Counter diffusion due to switching to lighter breathing gas HE02 vice NO, helium moves into tissues faster than NO moves out

14

Intravascular bubbles

Arterial, Venous, Capillary, Lymphatic

15

Venous Gas Embolism

Intravascular pressure lower, PP of inert gas greater. Decompression on ascent

16

Patent Foramen Ovale PFO

Opening between right and left Atria usually closed when infant takes first breath.

17

Mechanical damage of the bubble effect (AGE)

Bubble obstructs blood flow, distorts tissue and vessels

18

Non Mechanical damage

Strips veins (leaky vessel) , kinin's release, Edema, Blood thickens

19

Body response to Foreign bubbles Direct/Indirect effects

Platelets for clotting, causing leaking capillaries, edema swelling, capillary obstruction, nerve impingement.