Quantitative features derived from the time-based and volumetric capnogram such as respiratory rate, end-tidal PCO2, dead space, carbon dioxide production, and qualitative features such as the shape of capnogram are clinical metrics recognized as important for assessing respiratory function. Monitoring dead space during recruitment and PEEP titration in an experimental model. doi:10.1016/s0196-0644(96)70005-75)īy providing valuable real-time insights into the physiology of lung collapse and recruitment in a noninvasive manner, volumetric capnography lends itself to monitoring cyclical recruitment maneuvers at the bedside ( Tusman G, Suarez-Sipmann F, Böhm SH, et al. Utility of the expiratory capnogram in the assessment of bronchospasm. The expiratory capnogram is an effort‑independent, rapid, and noninvasive measurement that can help detect significant bronchospasms in adult patients with asthma ( Yaron M, Padyk P, Hutsinpiller M, Cairns CB. Accuracy of physiologic dead space measurements in patients with acute respiratory distress syndrome using volumetric capnography: comparison with the metabolic monitor method.
In a study of mechanically ventilated ARDS patients, volumetric capnography measurements of physiologic dead‑space‑to‑tidal‑volume ratio were as accurate as those obtained by metabolic monitor technique ( Kallet RH, Daniel BM, Garcia O, Matthay MA. Volumetric capnography in the mechanically ventilated patient. doi:10.1183/09031913092)Ĭalculations derived from volumetric capnography are useful for identifying pulmonary embolism at the bedside ( Blanch L, Romero PV, Lucangelo U. Physiologically based indices of volumetric capnography in patients receiving mechanical ventilation. The volumetric capnogram has been used successfully to measure anatomical dead space, pulmonary capillary perfusion, and ventilatory efficiency ( Romero PV, Lucangelo U, Lopez Aguilar J, Fernandez R, Blanch L.
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