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Review
. 2024 Nov;19(8):2105-2119.
doi: 10.1007/s11739-024-03715-3. Epub 2024 Aug 29.

Monitoring and modulation of respiratory drive in patients with acute hypoxemic respiratory failure in spontaneous breathing

Affiliations
Review

Monitoring and modulation of respiratory drive in patients with acute hypoxemic respiratory failure in spontaneous breathing

Anna Mocellin et al. Intern Emerg Med. 2024 Nov.

Abstract

Non-invasive respiratory support, namely, non-invasive ventilation, continuous positive airway pressure, and high-flow nasal cannula, has been increasingly used worldwide to treat acute hypoxemic respiratory failure, giving the benefits of keeping spontaneous breathing preserved. In this scenario, monitoring and controlling respiratory drive could be helpful to avoid patient self-inflicted lung injury and promptly identify those patients that require an upgrade to invasive mechanical ventilation. In this review, we first describe the physiological components affecting respiratory drive to outline the risks associated with its hyperactivation. Further, we analyze and compare the leading strategies implemented for respiratory drive monitoring and discuss the sedative drugs and the non-pharmacological approaches used to modulate respiratory drive during non-invasive respiratory support. Refining the available techniques and rethinking our therapeutic and monitoring targets can help critical care physicians develop a personalized and minimally invasive approach.

Keywords: Acute hypoxemic respiratory failure; Monitoring; Non-invasive respiratory support; Respiratory drive; Sedation.

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Conflict of interest statement

Declarations. Conflict of interest: RT, RF, LT, IC, AMarchioni, and EC declare patent N. 102021000007478 “APPARATO PER IL RILEVAMENTO ED IL MONITORAGGIO DELLA PRESSIONE NASALE” released on March 28th 2023 by the Italian Ministry of Enterprises and Made in Italy. RT, RF, LT, AMarchioni, and EC are co-founders of IREC ltd (VAT 02959080355) (Reggio Emilia, Italy). RT received travel support and fees from GSK, SEDA, Guidotti, United HealthCare Services. AMocellin, FG, SR, MT, AP, GB, JM, and DP have no competing interests with any organization or entity with a financial interest in competition with the subject, matter, or materials discussed in this manuscript.

Figures

Fig. 1
Fig. 1
Schematic representation of the causes of hyperactivation of the respiratory drive and the pharmacological and non-pharmacological options to control them. This figure represents the vicious cycle that can be triggered by lung damage leading to AHRF. Cortical, biochemical, mechanical, and inflammatory stimuli result in hyperactivation of the respiratory drive, leading to an increase in the mechanical work of respiratory muscles, thus initiating a vicious cycle that culminates in the formation of P-SILI. Non-pharmacological possibilities are mentioned in the pink boxes, while pharmacological options are listed in the green boxes to control this cycle. AHRF acute hypoxemic respiratory failure; P-SILI patient self-inflicted lung injury, PSV pressure support ventilation, ECCO2R extracorporeal carbon dioxide removal
Fig. 2
Fig. 2
Characteristics of the ideal sedative drug
Fig. 3
Fig. 3
“Lung-protective sedation” model. Preliminary assessment: search for signs and symptoms of discomfort and implement non-pharmacological strategies to reduce them. By integrating the preliminary assessment and measuring respiratory drive, it is possible to decide whether sedation is needed or not. If sedation is initiated, it is necessary to achieve the correct level of sedation and control of the respiratory drive through close monitoring. P0.1 Airway occlusion pressure, ΔPes Esophageal pressure swings, ΔPnose Nasal pressure swings, EAdi Diaphragm electrical activity, BPS-NI Behavioral pain scale non-intubated patients, US ultrasound, RSS Ramsay sedation scale, OAA/S observer’s assessment of alertness/sedation, RASS Richmond assessment sedation scale, BIS bispectral index

References

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