{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T04:17:58Z","timestamp":1790396278190,"version":"4.1.0"},"reference-count":26,"publisher":"Royal College of Psychiatrists","issue":"6","license":[{"start":{"date-parts":[[2018,1,2]],"date-time":"2018-01-02T00:00:00Z","timestamp":1514851200000},"content-version":"unspecified","delay-in-days":10259,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Psychiatry"],"published-print":{"date-parts":[[1989,12]]},"abstract":"<jats:p>During transcutaneous <jats:italic>PC<\/jats:italic>O<jats:sub>2<\/jats:sub> (<jats:italic>P<\/jats:italic><jats:sub>tc<\/jats:sub>CO<jats:sub>2<\/jats:sub>) monitoring of 15 freely ambulant patients suffering from panic attacks, all the patients experienced a typical attack. Seven were identified as hyperventilators, as <jats:italic>P<\/jats:italic><jats:sub>tc<\/jats:sub>CO<jats:sub>2<\/jats:sub> fell to abnormally low levels during the attack. This group could not be distinguished on the basis of either their usual symptoms of panic or the hyperventilation provocation test. There was no apparent association between absolute levels of <jats:italic>P<\/jats:italic>CO<jats:sub>2<\/jats:sub> and the nature of symptoms. The anxiety ratings of hyperventilators were lower than those of non-hyperventilators. These data do not support the hypothesis that hyperventilation causes panic attacks or contributes to their severity. 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