Acapnia
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Acapnia, literally meaning lack of carbon dioxide, is an unfortunate term once used to describe blood conditions during mountain sickness. The article explains that complete absence of CO2 does not occur, and Yandell Henderson therefore proposed the more accurate term hypocapnia.
Encyclopedia entry (1928–1936)
ACAPNIA (from Greek a- negative particle and kapnos—smoke, products of combustion in general, specifically referring to CO2), literally "absence of CO2." An unfortunate term proposed by Mosso to characterize the state of the blood in mountain sickness (see). In reality, a complete absence of CO2 in the blood does not occur, but rather only a lowered content thereof, as a consequence of which Henderson proposed the correct term—hypocapnia (see).
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“Acapnia.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/acapnia/