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Shallow water blackout: Quiz


Question 1: If excited or anxious about the dive take extra care to remain calm and breathe naturally; ________ (adrenaline) also causes hyperventilation without the diver knowing.

Question 2: Buddy pairs must both know ________ (CPR) current practice.
SurgeryCardiopulmonary resuscitationICD-9-CM Volume 3Electrocardiography

Question 3: Many ________ and near drowning events occur among swimmers who black out underwater while free-diving or doing breath-hold pool laps.
DrowningOxygen toxicityDecompression sicknessBarotrauma

Question 4: The primary urge to breathe is triggered by rising ________ (CO2) levels in the bloodstream.
Carbon sinkCarbon cycleGreenhouse gasCarbon dioxide

Question 5: [3][4] Blackout may also be referred to as a syncope or ________.
Syncope (medicine)Vasovagal episodePersistent vegetative stateICD-10 Chapter XVIII: Symptoms, signs and abnormal clinical and laboratory findings

Question 6: Hyperventilation, or over-breathing, involves breathing faster and deeper than the body naturally demands and is often used by divers in the mistaken belief that this will increase ________ (O2) saturation.

Question 7: Shallow water blackout is related to, but differs from deep water blackout in its characteristics, mechanism and prevention; ________ is precipitated by depressurisation on ascent from depth.
Oxygen toxicityDeep water blackoutRebreatherDecompression sickness


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