BSAC Interactive Learning

DT3 Oxygen and Diving Incidents

What transport mechanism in the blood does oxygen administration take advantage of to deliver extra oxygen to divers? See Student Workbook p34
1. Oxygen combines with haemoglobin in red blood cells
2. Oxygen dissolves in blood plasma
3. Oxygen combines with carbon dioxide in the blood
4. Oxygen dissolves in fatty tissues
5. Oxygen is absorbed by white blood cells.
Which of the following are causes of DCI? Tick all that apply. See Student Workbook p35
1. Inadequate elimination of nitrogen during ascent
2. Physical damage to the lung tissues due to overextension
3. Patent foramen ovale (PFO) preventing the elimination of otherwise harmless bubbles
Which of the following is the root cause of DCI? See Student Workbook p35
1. Thickened blood
2. Dissolved nitrogen
3. Dissolved oxygen
4. Bubbles of gas
5. Dehydration
After what type of dive should you consider the possibility of DCI, if the diver reports abnormal symptoms? See Student Workbook pp35-36
1. A deep dive
2. Any provocative dive
3. A dive involving missed stops and/or a rapid ascent
4. A dive where the buddy also reports symptoms
5. Any dive
How long after a dive do DCI signs and symptoms appear? See Student Workbook pp35-36
1. Immediately
2. A few minutes
3. Up to an hour
4. Many hours
5. Seconds to many hours
Which of the following is a sign of burst lung? See Student Workbook pp37-38
1. Itches and rashes
2. Joint pain
3. Nausea
4. Vocal changes and crepitation
5. Numbness and tingling
Which of the following is a sign of DCI? See Student Workbook p35
1. Bad breath
2. Cherry red lips
3. Bloody froth
4. Vocal changes and crepitation
5. Numbness and tingling
Which of the following is a sign of shock? See Student Workbook pp39-40
1. Itches and rashes
2. Joint pain
3. Pallor and sweating
4. Vocal changes and crepitation
5. Numbness and tingling
Which of the following mechanisms can cause shock? Tick all that apply. See Student Workbook pp39-40
1. Reduction in the amount of fluid available in the circulation
2. Changes in blood vessel tone reducing the efficiency of the blood circulation
3. Impaired pumping by the heart
4. Allergic reactions placing additional demands on the circulation
Which of the following is correct treatment for the type of casualty indicated? (The items shown may be only a part of the recommended first aid). Tick all that apply. See Student Workbook pp38-40
1. DCI - lie down with legs flat
2. Shock - lie down with legs flat
3. Near drowning - give 100% O2
4. DCI - lie down with legs raised
5. Shock - lie down with legs raised
6. Near drowning - apply BLS
What special precaution should be taken with a casualty who has been in the water for a long time, and so may be suffering from immersion shock? See Student Workbook pp40-41
1. Recover in a vertical position
2. Recover in a horizontal position
3. Keep warm
4. Give fluids
5. Do not give fluids
It is recommended that casualties should always be evacuated for further medical attention. For which of the following conditions can this requirement be waived if the casualty appears to make a full recovery on site? Tick all that apply. See Student Workbook p42
1. DCI
2. Burst lung
3. Near drowning
4. Shock
5. Immersion shock
6. Carbon monoxide poisoning
7. None of the above