The potentially fatal danger of breath hold diving
What is Hyperventilation (shallow water blackout)
100
The mimimum surface interval recmmmended by DAN before commercial air flight after an uncomplicated no decompression scuba dive.
What is 12 hours.
100
The condition characterized by unequal middle ear pressures, leading to asymmetric pressure stimulation of the bilateral vestibular apparati.
What is Alternobaric Vertigo (usually elicited by an attempt to equalize middle ear pressure with a Valsalva maneuver)
100
The most important determining factor in determining a diver's resistence to hyperthermia
What is aerobic fitness (though hydration status, age, lean body mass and percentage of body fat all play a role) Bookspan 158.
100
Most common source of carbon monoxide in the garage.
What is Methylene Chloride
200
Description of Hyperbaric Myopia
What is near vision improvement (possible far sighted decriments in eye function due to lenticular oxygen toxicity).
200
The time a diver must wait before altitude exposure after the treatment and resolution of pain only bends.
What is 72 hours.
200
The depth at which nitrogen narcosis is first noted in compressed air divers?
What is 100 fsw on air (Bove 117).
200
Potentially fatal cause for a diver, who likes to "skip breath" on NITROX to often surface with headaches, and at one time, become unconscious in water, but regained consciousness when fished from the surface.
What is hypercarbia.
200
The way in which carbon monoxide effects the hemoglobin oxygen dissociation curve.
What is "CO shifte the curve to the LEFT reducing tissue oxygenation"
300
The absolute atmopheric pressure surrounding a diver to descends to 165 fsw.
What is 165/ (33 ft/ atm) + 1 = 6 ATA
300
The treatment required when an asymptomatic chamber attendant is found to have inadvertantly breathed air instead of oxygen during the decompression portion of the chamber run (omitted decompression).
What is a Treatment Table 5 (USN Dive Manual)
300
The way in which a diamond on the sea floor will appear to a diver who is five feet away from it.
What is 33% larger and 3/4 closer
300
The most likely cause of concern when a tech diver (using a rebreather) stops swimming and sinks to the bottom (100 ft) but when brought up to surface by his buddy begins to mentate normally.
What is hypoxia.
300
Most common reason for symptomatic carbon monoxide poisoning in a diver.
What is contaminated air supply.
400
The altitude that represents the threshold for safe sport scuba diving.
What is 10,000 feet (above this only professionals with a DMO and slow acclimatization to altitude prior to diving should attempt diving).
400
The most common presenting symptom of DCS.
What is Localized Pain (77% of cases) Bove p 185.
400
The gas known for its great heat loss properties.
What is Helium (high thermal conductivity makes heat loss a major issue (Bove 12).
400
The most likely reason a 55 y/o scuba diver in an open wter class suddenly stops swimming, but is found with his gear intact and his regulator in his mouth, but is pulseless and apneic.
What is myocardial infarction.
400
The rate of visual change expected for oxygen toxicity myopia that occurs after prolonged daily HBOT.
What is 1/4 diopter per week (Kindwall 75; KK Jain p 507; Bookspan p 40).
500
The activity associated with the greatest survival in 50 degree F water.
What is HELP position (Heat Escape Lessening Position) which is curling in the fetal position to protect areas of high heat loss (Bove p 215).
500
The amount of oxygen dissolved in 100 ml of blood at 2.8 ATA on 100% oxygen.
What is 6 ml (0.003 X 2000 - enough oxygen to meet basic metabolic needs without relying on hemoglobin). Committee Report, Kidnwall, Bookspan.
500
The mimimum level of tissue pO2 reuired for leukocyte mediated bacterial killing.
What is 30 mm Hg (Committee Report)
500
The fatal event surrounding the body of a diver who was extracted from the water surface with normally functioning equipement, an empty NITROX tank, and a depth gauge that reads 100 feet.
What is hyperoxic seizure.
500
Which gas, of the following, has the least narcotic or anesthetic effect? Nitrogen / Hydrogen / Helium / Argon / Neon