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L. C. McNamara et al.
2. Respiratory support for patients during short breaks from NPPV.
3. Post-extubation respiratory support if patients are unable to tolerate BPAP,
which should otherwise be the device of choice [162].
Similar to NPPV, the major contraindication to HFNC is if the patient otherwise requires intubation and invasive mechanical ventilation. Other contraindications include altered mental status and intolerance of the device [169].

6.5.3 Invasive Mechanical Ventilation

Invasive mechanical ventilation (IMV) is a way to provide oxygenation and manda­tory ventilation to patients, most often via an endotracheal tube or at times via a tracheostomy, for patients who have already undergone this procedure or who require prolonged IMV. These connections allow for a completely closed system by which critical care clinicians can provide high levels of respiratory support. When patients receive IMV via an endotracheal tube, analgosedation should be optimized to ensure patient comfort.
In patients with ECOPD, IMV is indicated for severe respiratory distress or life­threatening respiratory failure, failure of noninvasive options like BPAP or HFNC, or airway protection. We dene failure of noninvasive options as worsened work of breathing or gas exchange. More specically, pH <7.25 after 2hours of BPAP has been associated with a >90% need for intubation [154]. Furthermore, if patients are unable to be liberated from BPAP within 48hours, we recommend consideration of IMV. Beyond bedside observation, scoring tools such as the BAP-65 (which includes BUN, mental status, HR, and age) can help predict which patients with ECOPD will require IMV [170, 171]. Although many patients treated with NPPV initially will ultimately require endotracheal intubation, studies suggest that attempting NPPV does not cause harm and importantly identies patients who do not require intuba­tion; as such, this can lead to improved patient outcomes, specically lower mortal­ity and ICU LOS [172, 173].
After intubation, attention should focus on optimizing ventilator settings to enhance ventilation, oxygenation, resistance, and compliance, along with ensuring proper analgesia and sedation. These conversations should occur at the bedside with input from multiple members of the care team, including but not limited to the clini­cians, respiratory therapists, and nurses. Many ventilator settings are dependent on the brand and model of the ventilator as well as the selected mode of support. Strategies for patients undergoing IMV are aimed at supporting the patient’s oxygen and ventilation needs, while also preventing dynamic hyperination and its deleteri­ous sequela (described in more detail in Sect. 6.2.2). In order to achieve these goals, we recommend:
1. Adhering to the general principles of lung-protective ventilation described else-
where in order to minimize ventilator-associated lung injury [174]. There should be a particular emphasis on low tidal volumes (4–8cc/kg of ideal body weight),
6 Acute Exacerbations ofChronic Obstructive Pulmonary Disease
141
which reduces the risk of dynamic hyperination by providing smaller volumes that are easier to expire.
2. Prolonging the expiratory time to ensure complete exhalation and avoidance of
dynamic hyperination. This can be achieved by slowing the respiratory rate and adjusting the inspiratory to expiratory ratio (I:E ratio) so that it is at least 1:3.
3. Permitting hypercapnia, as long as the pH is within a hemodynamically and
metabolically safe range (i.e., >7.2), to allow for the lower tidal volumes and longer expiratory time discussed above.
4. Promoting ventilator-patient synchrony and reducing patient work of breathing,
acknowledging that sedation and even paralysis may be required to achieve this [175].
5. Utilizing best PEEP titration strategies (i.e., pressure-volume loop, decremental
PEEP, esophageal manometry) to help reduce patient’s work of breathing and to stent open distal airways, thus improving total airway resistance [176]. The amount of applied PEEP should never exceed the amount of intrinsic PEEP [177].
Further titration of ventilator settings should take into account the patient’s oxy­gen saturation, acid-base status, measurements of intrinsic PEEP, airway resistance, and compliance [178]. Patients should be assessed daily for spontaneous awakening and breathing trials and should be weaned from the ventilator safely but expedi­tiously, using NPPV and/or HFNC as post-extubation support (as discussed in detail in Sects. 6.5.1 and 6.5.2) [179].

6.6 Conclusion

COPD exacerbations result in signicant utilization of healthcare resources, includ­ing ICU admissions, and high patient morbidity and mortality [180]. Optimization of pulmonary physiology during an acute exacerbation requires a multidisciplinary approach to address potential triggers, decrease airway inammation, reduce airway resistance, and support adequate oxygenation and ventilation.

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