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Describe Boyle's Law
- Boyle's = Balloon = Barotrauma
- The pressure of a gas is inversely proportional to the volume of a gas at a constant temperature.
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What effects will Boyle's Law have on medical equipment during flight?
- 1. ETT Cuffs
- 2. MAST Trousers
- 3. Air Splints
- 4. IV Drip Rates (Increase)
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Define pneumocephalus and the effects of this during flight.
Air inside the cranial vault after trauma (ball peen-hammer). During flight the intracranial pressure will increase.
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Describe Gay-Lussac's Law.
Direct proportional relationship between temperature and pressure.
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Explain what would happen to an O2 bottle's pressure when the temperature drops.
Pressure would drop.
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Describe Henry's Law.
Henry = Heineken
Is associated with the solubility of gas in a liquid.
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Decompression Sickness is also called what?
The Bends
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Describe Graham's Law
- Graham's = Grey Matter
- It is the law of gaseous diffusion and effects the exchange of gas at the cellular level.
- Gas bubbles coming out of exposed grey matter at altitude.
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Differentiate between Type I and Type II Decompression Sickness.
- Type I - Pain
- Type II - Stroke like symptoms
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What type of transportation is preferred for Decompression Sickness patients?
- Ground transport is preferred
- If flown pt should be kept below 1000 ft
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How many atmospheres is a person at sea level exposed to?
One
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When making atmosphere calculations how many feet below the water equals an additional atmosphere?
Every 33' down adds an additional atmosphere tour calculation.
(depth dove/33) + 1
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Describe effects of Dalton's Law.
Dalton's Gang
Soft tissue swelling at altitude
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What causes Arterial Gas Embolism?
Breath holding during ascent on a dive, air pushes through the alveoli and enters the skin in neck/chest.
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What is the treatment for Arterial Gas Embolism (AGE)
- Immediate hyperbaric treatment
- Fly in pressurized aircraft or below 1000 MSL
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Regarding Atmosphere Zones what is the Physiologic Zone?
- Sea level to 10,000ft MSL
- Night vision is decreased beginning at 5,000 ft. MSL
- No Oxygen required
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Regarding Atmosphere Zones what is the Physiologically Deficent Zone?
- 10,000ft MSL to 50,000ft MSL
- Oxygen is required to survive at these altitudes.
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What are 2 signs of compression loss?
- Cooler Temperatures
- Window Fogging
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At 30,000ft MSL how much time of useful consciousness (TUC) would with decompression vs rapid decompression?
- 90 seconds during decompression
- 45 seconds during rapid decompression
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Regarding Atmosphere Zones what is the Space Equivalent Zone?
- >50ft MSL
- If you are here congratulations on becoming an astronaut!
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What is the Oxygen Adjustment Calculation?
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What is the pressure value a sea level (1 ATM)?
760 torr
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What is the pressure value at 18,000ft MSL?
380 torr
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You have a patient on a NRB mask at 0.5 FiO2 and you are at sea level. You will be flying to an altitude with a torr of 500. What will the O2 requirement be at this altitude?
0.5 X 760/500 = 0.76 FiO2 (76% O2)
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What are the 4 types of Hypoxia?
- Hypemic
- Histotoxic
- Hypoxic
- Stagnant
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What would cause Hypemic Hypoxia?
- Reduction of O2 carrying capacity of blood
- Anemia
- Hemorrhage
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What would cause Histotoxic Hypoxia?
- "Poisoning"
- Limits the use of available O2 due to poisoning
- Cyanide, ETOH, CO, Nitroglycerin, Sodium Nitroprusside (Nipride)
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What would cause Hypoxic Hypoxia?
- "Not enough oxygen in the air"↓partial pressure of oxygen at altitude
- Deficiency in alveolar oxygen exchange
- Cardiovascular/Pneumothorax patients are more susceptible to this type of hypoxia
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What would cause Stagnant Hypoxia?
- "Blood isn't moving"Reduced cardiac output or pooling of blood
- High G force, Cardiogenic Shock
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What is the acronym for the stages of Hypoxia?
ICDC
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How many stages of hypoxia are there?
4
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What are the stages of Hypoxia?
- Indifferent
- Compensatory
- Disturbance
- Critical
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What is the most important stage of Hypoxia and why?
- Indifferent.
- Because you can still think.
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What are the symptoms of the Indifferent stage of Hypoxia?
- Full reasoning abilities.
- Some loss of night vision.
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What are the symptoms of the Compensatory stage of Hypoxia?
- Increased HR
- Increased Ventilations
- Slowed Judgement
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What are the symptoms of the Disturbance stage of Hypoxia?
- Slurred speech
- Impaired judgement
- "Drunk"
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What are the symptoms of the Critical stage of Hypoxia?
- No longer able to physically move
- Death imminent
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What are the "self-imposed" stressors of flight?
- Dehydration
- Exhaustion
- Alcohol
- Tobacco
- Hypoglycemia
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What are the "inherent" stressors of flight?
- Thermal changes
- ↓ Humidity
- G-forces
- ↓ Partial pressure of oxygen
- Barometric pressure change
- Noise
- Vibration
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The people most affected by G forces are:
- On B/P Meds (Beta Blockers)
- Dehydrated
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What 3 environmental conditions has the greatest negative outcome to your patient?
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Describe Barondontalgia. When does it occur?
Air trapped in fillings expands due to Boyle's Law on Ascent.
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Describe Barotitis. When does it occur?
Air trapped in the middle ear can't vent through the blocked Eustachian Tube on decent.
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Describe Barosinusitis. When does it occur?
- Air trapped in the Sinus. Can occur both on accent and decent.
- Can cause pain in the Maxillary teeth (Decent = Barosinusitis Acent = Barondontalgia)
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What are your typical Air Transport team Members?
- Flight Nurse
- Flight Paramedic
- Respiratory Therapist
- Flight Physician
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Why do most aircraft fly single pilot?
Save weight and $$
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What is your typical crew mix?
- Pilot
- Flight Paramedic
- Critical Care Nurse
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What does AMRM stand for?
- Air
- Medical
- Resource
- Management
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What does AMRM do?
- Distributes workload
- Operational practice involving ALL members in mission planning, decision making, & mission safety
- Same as CRM
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Define sterile cockpit.
Only essential communications during all phases of flight except straight and level flight.
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What are your critical stages of flight?
- Takeoff
- Landing (Short final)
- Refueling
- Taxi (Ground or air)
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For flight following requirements how often are calls made while in flight?
Every 15 minutes
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For flight following requirements how often are calls made while sitting on the ground?
Every 45 minutes
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For flight following requirements when is the Emergency Action Plan activated?
15 minutes after failure to report in.
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As per CAMTS how many intubations should you complete before starting missions?
- 5
- Should perform quarterly thereafter
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As per CAMTS what characteristics should your flight suit have?
- Flame retardent
- Must pull 1/4" away from body
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As per CAMTS which comes first aviation or patient care?
- Safe operation of the aircraft comes first patient care comes next.
- Aviate before we Medicate
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As per CAMTS define long range transport.
Transport greater than 3 hours
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As per CAMTS when can you not wear a seatbelt?
- Straight and level flight
- When PIC directs you to
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Who has the ultimate authority of the mission?
PIC
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What are the Rotary Wing Pilot requirements as per CAMTS?
- 2,000 total flight hours
- 1,000 flight hours as PIC
- 100 flight hours as PIC at night
- 1,200 hours in R/W
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What are the Fixed Wing Pilot requirements as per CAMTS?
- 2,000 total flight hours
- 1,000 flight hours as PIC
- 100 flight hours as PIC at night
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For the Rotary Wing Pilot how many hours must he obtain in area Orientation before a solo mission?
5 hours total with at least 2 hours at night
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Who does FAR Part 91 rules apply to?
Everyone
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What are some of the FAR Part 91 rules?
- No duty day
- No weather mins
- 8 hours bottle to throttle
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Who do FAR 135 rules apply to?
Flying passengers for $$
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What are FAR Part 135 regulations?
- Max 14 hour duty day
- 8 hour total flying time
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What are the non-mountainous day and night weather mins for R/W aircraft?
- Day - 800' - 2 miles visibility
- Night (W/NVGs) - 800' - 3 miles
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Define Marginal Weather. Can you fly in these conditions?
- Weather close to or at mins
- Yes, you can fly - but accepting risk
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Define below minimums. Can you fly in these conditions? What if you encounter this in flight?
- Weather is UNDER Minimums
- No, you can not fly
- Divert to nearest facility
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What is the #1 cause of crashes?
- Weather
- (#2 is night flight)
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Define VFR.
- Visual Flight Rules
- Flight in weather where you can see where you are going
- Visual Meteorological Conditions (VMC)
- There are no intended instrument flying under these rules.
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Define IFR.
- Instrument Flight Rules
- Conditions do not allow safe flight by sight alone. Pilot must use instruments.
- Instrument Meteorological Conditions (IMC)
- If weather allows pilot may fly under VFR/VMC
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What is IIMC?
- Inadvertent Instrument Meteorologic Conditions
- Unexpected weather requiring instrument flight
- Referred to as "double IMC"
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What 5 things must you have for a Helicopter Landing Zone (HLZ)?
- Communications with the ground
- HLZ large enough to land (100' X 100')
- 1 approach and departure heading
- 2 passes (One high & One low)
- 2 Vehicles crossing headlights to mark HLZ
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What 5 things must you have for a Permanent Helipad?
- 2 approach and departure headings
- Perimeter lighting
- landing beacon
- windsock
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What are the 3 in-flight emergencies?
- Land immediately
- Land as soon as possible
- Land as soon as practical
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What is the pre-crash sequence?
- Lay patient flat
- Turn off Oxygen
- Assume Crash Position
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What is the crash position?
- Seat belt secured
- Sit up straight
- Helmet strap tight/visor down
- Knees together, feet 6 feet apart, flat on the floor
- Arms crossed on chest
- Chin to Chest
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What is the post crash sequence?
- Turn off Throttle
- Turn off Fuel
- Turn off Battery
- Exit Aircraft - Meet at 12 o'clock position
- Shelter, Fire, Water, Signal
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At what point is an ELT activated? What channel does it transmit?
- 4 G's
- Transmits on 121.5 MHz
- Some on 406 MHz
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What does EMTALA stand for?
- Emergency
- Medical
- Treatment
- Active
- Labor
- Act
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What does EMTALA ensure?
- You must act if someone requires emergency care to sustain life or is actively giving birth.
- If someone is injured within 150 yards of a hospital, they must be treated
- Sending physician is responsible for the patient until they arrive at next facility
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What 6 things must be present to prove negligence?
- Presence of Duty
- Breach of Duty
- Foreseeability
- Causation
- Injury
- Damages
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What do you have a duty to report?
- Child Abuse
- Elder Abuse
- Violent Crime
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Name 7 indications for intubation.
- Unable to swallow
- Pt can't ventilate/oxygenate
- GCS < 8
- Expected clinical course (inhalation burns, circumferential neck or chest burns, anaphylaxis)
- Apnea
- Airway Obstruction
- Respiratory failure
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3 Clinical findings indicating Respiratory failure:
- pH<7.2, CO > 55, PaO2 < 60
- (Any value off indicates intubation)
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Define Sellick's Maneuver.
- Direct downward pressure on thyroid cartilage, occludes the esophagus and prevents aspiration during intubation.
- DO NOT RELEASE UNTIL INTUBATION IS COMPLETE!
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What is BURP?
- Backward
- Upward
- Rightward
- Pressure
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What is the failed airway algorithm?
- Pt requires a secured airway
- 3 attempts of direct laryngoscopy unsuccessful
- Ventilate pt w/ BVM/Simple Airway/ Blind Airway
- Unable to ventilate/oxygenate SaO2 > 90%
- Cricothyroidotomy Indicated
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What is the gold standard for verification of tube placement?
- Chest X-Ray
- ETT should be 2-3cm above carina (1")
- Level with T2 or T3 vertebrae
- (next most reliable confirmation method is visualization of the tube passing through the cords)
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What pressure do we inflate the distal cuff of the ETT to?
20-30 mmHg to prevent mucosal tissue damage
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What are the 7 Ps of intubation?
- Preparation - Make sure equipment is serviceable
- Pre-oxygenate - 3-5 min, 10-15 LPM
- Pretreatment - LOAD
- Paralysis w/ induction - Neuromuscular blockade, Induction agent, pain control
- Protect & Position - Sniffing position, towel under shoulder blades
- Placement w/ Proof - Tube passing, CO, Chest xray
- Post intubation management - maintain sedation & Oxygenation
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Define the steps in LOAD
- Lidocaine (head/lung injury) blunts cough reflex preventing ICP increase
- Opiates - blunts pain response
- Atropine for infants - prevents reflexive bradycardia in infants <1 y/o
- Defasiculating dose - use Succinycholine, Rocuronium, or Vecuronium
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What is the dose of Succinylcholine?
1-2 mg/kg
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What is the onset and duration of Succinylcholine?
- Onset - 1-2 min
- Duration - 4-6 min
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How long is Succinylcholine good for after removed from refrigeration?
14 days
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What are the contraindications for Succinylcholine?
- Crush injuries
- Eye injuries
- Narrow angle glaucoma
- Hx of Malignant Hyperthermia
- Burns > 24hrs
- Hyperkalemia
- Any Nervous System disorder (Guillain-Barre, Myasthenia gravis)
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What are the signs & symptoms of Malignant Hyperthermia?
- Masseter spasm/trismus (lockjaw)
- Sustained tetanic muscle contractions
- Rapid increase in temperature
- Increased ETCO2
- Tachycardia/ HTN
- Mixed acidosis
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What do you use to treat Malignant Hyperthermia? What dose?
- Dantrolene Sodium (Dantrium)
- Dose 3.0 mg/kg
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What is the dose for Vecuronium? What is the onset and duration?
- Dose: 0.04 - 0.06 mg/kg (following Succinylcholine)
- Onset: 4-6 min
- Duration: 30-45 min
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What is the dose for Rocuronium? What is the onset and duration?
- Dose: 0.1-0.2 mg/kg IV q20-30 min
- Onset: 4-6 min
- Duration: 30-45 min
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