Diving Physics and 'Fizzyology' . A more expansive discussion on dysbarisms than Dive Safety. Medical aspects of diving . Presents a discussion of various medical problems and their relationship to diving. Initial discussions include diabetes and asthma.
Carbon dioxide becomes toxic when it suppresses respiration.
Normally an increase in PCO 2 decreases blood pH, which acts to increase the respiratory rate. Pain and barotrauma from expanding or contracting gases while transiting between pressure zones are the most direct effects predictable from Boyle's Law. Good dental care should avoid trapped gas in teeth. Divers and flyers should anticipate these effects and not attempt to suppress the release of natural digestive gases that will expand during ascent. Blockage of sinus passages due to nasal congestion or a head cold can cause pain during either ascent or descent.