Rib Cage Contribution to Ventilation during Anesthesia
The effects of general anesthesia on the respiratory muscles have interested anesthetists for 130 years, and are still not clearly understood. J ohn Snow was the first to report changes in ribcage (RC) and abdominal (AB) motion during anesthesia. In his comprehensive description of chloroform anesthesia published in 1858 (1) he described reduced movement of the RC in most patients, and regarded this as a sign that “a little more chloroform had been inhaled than was necessary.” In a more recent study (1925) (2), Miller described five types of respiration during ether anesthesia, varying from predominantly Re motion to predominantly AB motion. He described RC motion as decreasing progressively with deepening anesthesia, and reported that at division 2 of Guedel’s stage 2 anesthesia, respiration was mainly by the diaphragm in most patients. Interestingly, he found no such changes with nitrous oxide-air anesthesia.
KeywordsFunctional Residual Capacity Report Change Chest Wall Mechanic Chloroform Anesthesia Dynamic Spatial Reconstructor
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