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It has been shown that breathing rate goes up and PCO<jats:sub>2<\/jats:sub>down in non-retarded and neurotic depression. Schizophrenia gives more anomalous results. The fact is emphasized that such changes must lead to alterations in pH and other variables. Studies showing some small chemical differences between these clinical entities and control subjects might therefore be explained by these findings.<\/jats:p>","DOI":"10.1192\/bjp.129.5.457","type":"journal-article","created":{"date-parts":[[2008,8,12]],"date-time":"2008-08-12T22:35:43Z","timestamp":1218580543000},"page":"457-464","source":"Crossref","is-referenced-by-count":28,"title":["Respiratory Ventilation and Carbon Dioxide Levels in Syndromes of Depression"],"prefix":"10.1192","volume":"129","author":[{"given":"J. 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