Dive Leader Knowledge: DT3 - Basic Life Support (BLS) Question Title * 1. What additional transport mechanism in the blood does oxygen administration take advantage of to deliver extra oxygen to divers? Oxygen combines with haemoglobin in red blood cells Oxygen dissolves in blood plasma Oxygen combines with carbon dioxide in the blood Oxygen dissolves in fatty tissues Oxygen is absorbed by white blood cells. OK Question Title * 2. Which of the following are causes of DCI? Please select all that apply. Inadequate elimination of nitrogen during ascent Physical damage to the lung tissues due to over extension Patent Foramen Ovale (PFO) preventing the elimination of otherwise harmless OK Question Title * 3. Which of the following is the root cause of DCI? Thickened blood Dissolved nitrogen Dissolved oxygen Bubbles of gas Dehydration OK Question Title * 4. After what type of dive should you consider the possibility of DCI, if the diver reports abnormal symptoms? A deep dive Any provocative dive A dive involving missed stops and/or a rapid ascent A dive where the buddy also reports symptoms Any dive OK Question Title * 5. How long after a dive do DCI signs and symptoms appear? Immediately A few minutes Up to an hour Many hours Seconds to many hours OK Question Title * 6. Which of the following is a sign of burst lung? Itches and rashes Joint pain Nausea Vocal changes and crepitation Numbness and tingling OK Question Title * 7. Which of the following is a sign of DCI? Bad breath Cherry red lips Bloody froth Vocal changes and crepitation Numbness and tingling OK Question Title * 8. Which of the following is a sign of shock? Itches and rashes Joint pain Pallor and sweating Vocal changes and crepitation Numbness and tingling OK Question Title * 9. Which of the following mechanisms can cause shock? Please select all that apply. Reduction in the amount of fluid available in the circulation Changes in blood vessel tone reducing the efficiency of the blood circulation Impaired pumping by the heart Allergic reactions placing additional demands on the circulation OK Question Title * 10. Which of the following is the correct treatment for the type of casualty indicated? (The items shown may be only a part of the recommended first aid). Please select all that apply. DCI - lie down with legs flat Shock - lie down with legs flat Near drowning - give 100% O2 DCI - lie down with legs raised Shock - lie down with legs raised Near drowning - apply BLS OK Question Title * 11. 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? Recover in a vertical position Recover in a horizontal position Keep warm Give fluids Do not give fluids OK Question Title * 12. 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? DCI Burst lung Near drowning Shock Immersion shock Carbon monoxide poisoning None of the above OK DONE