Acute and Critical Care

Original Article

Pulmonary
Agreement between two methods for assessment of maximal inspiratory pressure in patients weaning from mechanical ventilation: Emanuelle Olympia Silva Ribeiro, Rik Gosselink, Lizandra Eveline da Silva Moura, Raissa Farias Correia, Wagner Souza Leite, Maria das Graças Rodrigues de Araújo, Armele Dornelas de Andrade, Daniella Cunha Brandão, Shirley Lima Campos; Acute Crit Care. 2022;37(4):592-600. Published online October 27, 2022; DOI: https://doi.org/10.4266/acc.2022.00325

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Abstract PDF: Background
Respiratory muscle strength in patients with an artificial airway is commonly assessed as the maximal inspiratory pressure (MIP) and is measured using analogue or digital manometers. Recently, new electronic loading devices have been proposed to measure respiratory muscle strength. This study evaluates the agreement between the MIPs measured by a digital manometer and those according to an electronic loading device in patients being weaned from mechanical ventilation. Methods: In this prospective study, the standard MIP was obtained using a protocol adapted from Marini, in which repetitive inspiratory efforts were performed against an occluded airway with a one-way valve and were recorded with a digital manometer for 40 seconds (MIPDM). The MIP measured using the electronic loading device (MIPELD) was obtained from repetitively tapered flow resistive inspirations sustained for at least 2 seconds during a 40-second test. The agreement between the results was verified by a Bland-Altman analysis. Results: A total of 39 subjects (17 men, 55.4±17.7 years) was enrolled. Although a strong correlation between MIPDM and MIPELD (R=0.73, P<0.001) was observed, the Bland-Altman analysis showed a high bias of –47.4 (standard deviation, 22.3 cm H2O; 95% confidence interval, –54.7 to –40.2 cm H2O). Conclusions: The protocol of repetitively tapering flow resistive inspirations to measure the MIP with the electronic loading device is not in agreement with the standard protocol using one-way valve inspiratory occlusion when applied in poorly cooperative patients being weaned from mechanical ventilation.

Review Article

Basic science and research
Two-photon intravital imaging of leukocyte migration during inflammation in the respiratory system: Young Min Kim, Soi Jeong, Young Ho Choe, Young-Min Hyun; Acute Crit Care. 2019;34(2):101-107. Published online May 31, 2019; DOI: https://doi.org/10.4266/acc.2019.00542

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Two-photon intravital imaging is a powerful method by which researchers are able to directly observe biological phenomena in live organisms. Researchers in various biomedical research fields have applied two-photon imaging to a variety of target organs by utilizing this technology’s ability to penetrate to significant depths with minimal phototoxicity. The mouse respiratory system in inflammation models is a good example, as two-photon intravital imaging can provide insights as to how the immune system is activated in response to inflammation within the respiratory system. Inflammation models can be generated via influenza viral, bacterial, or lipopolysaccharide injection. To exteriorize the lungs or trachea, thoracotomy or tracheotomy is performed, respectively; the appropriate combination of inflammation induction and organ exposure is selected depending on the study purpose. On the other hand, visualizing the movement of leukocytes is also an important component; to this end, immune cell populations of interest are either labeled via the genetic attachment of fluorescent proteins or stained with antibodies or dyes. With the proper selection of methods at each step, twophoton intravital imaging can yield visual evidence regarding immune responses to inflammation.

Citations

Citations to this article as recorded by

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