title: Diving bradycardia as a factor in underwater blackout.
mesh_terms: D000293:Adolescent; D000328:Adult; D001049:Apnea / Q000150:complications; D001919:Bradycardia / Q000150:complications / Q000209:etiology*; D002245:Carbon Dioxide / Q000097:blood; D004242:Diving / Q000009:adverse effects*; D006339:Heart Rate; D006801:Humans; D000860:Hypoxia / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D012119:Respiration; D013575:Syncope / Q000209:etiology*
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen