SUMC Flashcards
Describe Boyles Law?
Pressure + Volume Vary Inversely [Temp Constant]
P1V1 = P2V2
Describe Charles’ Law?
Volume + Temperature Vary Directly [Pressure Constant]
V1/T1 = V2/T2
Describe Gay-Lussac’s Law?
Pressure + Temperature Vary Directly [Volume Constant]
P1/T1 = P2/T2
Describe Dalton’s Law?
Total Pressure = Sum Of All Partial Pressures
PTotal = P1 + P2 + Px
Describe Henry’s Law?
Solubility Of Gas Varies Directly With Pressure + Varies Inversely With Temperature
What Is Decompression Illness [DCI]?
Evolved Gas Disease
[Incorporates DCS + Barotrauma]
Define Absolute Pressure?
Gauge Pressure + Atmospheric Pressure
Depth [Meters] + 10 / 10
What Happens To Light As You Dive?
Light Wavelengths Blocked
Red = 1st Blue = Last
[ROYGBIV]
Injuries Associated With Descent?
[HONE]
High Pressure Neuro Syndrome
Oxygen Toxicity
Nitrogen Narcosis
Ear Barotrauma
Injuries Associated With Ascent?
[PADS]
Pulmonary Over Inflation Syndrome
Arterial Gas Embolism
Decompression Illness [DCI]
Skin Squeeze
Pros/Cons Of Oxygen?
Pro: Required To Breath
Cons: ^ = Toxicity [CNS = >1.7ata + Pulm = 0.5ata]
v = Hypoxia
Pros/Cons Of Nitrogen?
Pros: Inert Gas
Cons: ^ = Narcosis + DCI
Pros/Cons Of Carbon Dioxide?
Pros: Breathing Reflex
Cons: ^ = Dizzyness/SOB
v = Shallow Water Blackout [Loss Of Reflex]
Pros/Cons Of Helium?
Pro: Inert Gas
Cons: ^ = Hypothermia + Narcosis + HPNS
Benefits Of Nitrox?
Longer Duration Of Dive
Benefits Of 100% Oxygen?
No Decompression Required
Describe Haldane Principle?
Elimination Of Gas Occurs Exponentially @ Ratio 2:1
Symptoms Of Decompression Illness?
[MR LSC]
MSK = Joint Pain Resp = The Chokes Lymphatic = Peu d’Orange Skin = Rash CNS = Ataxia + Parasthesia + Visual Disturbances
Management Of Decompression Illness?
Hyperbaric Chamber
Types Of Tables For Hyperbaric Chamber?
Table 61 = Missed Deco [~5min To Enter - RARE]
Table 62 = Short Decompression
Table 67 = Long Decompression
Describe SCUBA?
Self Contained Underwater Breathing
< 30m
Compressed Air
Describe Saturation Diving?
Trimix
Based Below 50m
Decompress Post Job
What Depth Does HPNS Occur At?
150m
Describe Guidelines For Recreational Diving?
BSAC + Self Report
Describe Guidelines For Commercial Diving?
MA 1
Describe Guidelines For Military Diving?
Br 1750a Chapter 12
JSP 950
Most Common Diving Injury?
ENT Barotrauma
Most Severe Diving Injury?
Arterial Gas Embolism
As Diver Ascends, What Law Dictates Gas Will Expand?
Boyles Law
As Diver Descends, What Law Dictates Partial Pressures Will Increase?
Dalton’s Law
Can Diver Continue With History Of Pneumothorax?
Spontaneous = NO Traumatic = YES [BUT NEEDS SMO[DM] REVIEW]
Symptoms Of CNS Oxygen Toxicity?
[VENTID C] Vision Change Ear Tinnitus Nausea Tingling Irritation Dizzyness Convulsions
What Does Nitrox 36 Mean?
36% Oxygen
64% Nitrogen
Atmospheric Pressure @ Surface?
1 ata
Can You Sign Off Diver For Military Recreational Diving In Free Time?
No
Can Only Sign Off For Diving @ Work
What Effect Causes Decompression Illness?
Bubble Effect
Describe Bubble Effect?
Increased Depth > Increased Partial Pressures [Daltons Law] Increased Partial Pressures > Increased Saturation Of Tissues [Henry’s Law] Increased Saturation > Super Saturation Ascent > Bubble Formation [Henry’s Law] Ascent > Larger Bubbles [Boyles Law]
Differentiate Between Outer/Middle/Inner Ear Barotrauma?
Outer = Hood Squeeze + Descent Middle = Reverse Squeeze [Tympanic Membrane] + Ascent/Descent Inner = Oval/Round Window Rupture + Descent + ENDEX
No Fly/Dive Time For Missed Decompression?
Fly = 24hrs
Dive = 48hrs
No Fly/Dive Time For DCI 1?
Fly = 72hrs
Dive = 7 Days
No Fly/Dive Time For DCI 2?
Fly = 72hrs [Table 62] OR ~6 Weeks [Unresolved]
Dive = 28 Days OR ~SMO[DM] [Unresolved]
