Functional Residual Capacity
Functional residual capacity (FRC) is the lung volume, volume of air present in the lungs at the end of passive Exhalation, expiration.Hopkins E, Sharma S. Physiology, Functional Residual Capacity. [Updated 2022 Jan 4]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK500007/ At FRC, the opposing elastic recoil forces of the lungs and chest wall are in equilibrium and there is no exertion by the thoracic diaphragm, diaphragm or other respiratory muscles. Measurement FRC is the sum of expiratory reserve volume (ERV) and residual volume (RV)Levitzky M.G. (2021). Alveolar ventilation. Levitzky M, & McDonough K, & Kaye A, & Hall S(Eds.), Clinical Physiology in Anesthetic Practice. McGraw Hill. https://accessanesthesiology.mhmedical.com/content.aspx?bookid=2979§ionid=249590087 and measures approximately 3000 mL in a 70 kg, average-sized male. It cannot be estimated through spirometry, sinc ...
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