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Corral-Blanco, M.; Sayas-Catalán, J.; Hernández-Voth, A.; Rey-Terrón, L.; Villena-Garrido, V. High-Flow Nasal Cannula Therapy as an Adjuvant Therapy. Encyclopedia. Available online: https://encyclopedia.pub/entry/53385 (accessed on 26 December 2024).
Corral-Blanco M, Sayas-Catalán J, Hernández-Voth A, Rey-Terrón L, Villena-Garrido V. High-Flow Nasal Cannula Therapy as an Adjuvant Therapy. Encyclopedia. Available at: https://encyclopedia.pub/entry/53385. Accessed December 26, 2024.
Corral-Blanco, Marta, Javier Sayas-Catalán, Ana Hernández-Voth, Laura Rey-Terrón, Victoria Villena-Garrido. "High-Flow Nasal Cannula Therapy as an Adjuvant Therapy" Encyclopedia, https://encyclopedia.pub/entry/53385 (accessed December 26, 2024).
Corral-Blanco, M., Sayas-Catalán, J., Hernández-Voth, A., Rey-Terrón, L., & Villena-Garrido, V. (2024, January 03). High-Flow Nasal Cannula Therapy as an Adjuvant Therapy. In Encyclopedia. https://encyclopedia.pub/entry/53385
Corral-Blanco, Marta, et al. "High-Flow Nasal Cannula Therapy as an Adjuvant Therapy." Encyclopedia. Web. 03 January, 2024.
High-Flow Nasal Cannula Therapy as an Adjuvant Therapy
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This entry is adapted from the peer-reviewed paper 10.3390/jcm13010081

High-flow nasal cannula (HFNC) is a respiratory support technique that delivers a controlled concentration of oxygen with high flow, heat, and humidity via the nasal pathway. As it has many physiological effects, its use has increased for a variety of clinical indications.

high flow nasal cannula acute hypoxemic respiratory failure hypoxemia endoscopy bronchoscopy airway intervention sedation

1. Introduction

High-flow nasal cannula (HFNC) is a modern technique for respiratory support that delivers a controlled concentration of oxygen with high flow, heat, and humidity via the nasal pathway [1]. Since HFNC has various physiological effects [2], it has become more commonly used for various clinical indications, ranging from non-invasive respiratory support in acute respiratory failure (ARF) [3] to a tool for weaning or respiratory support in high-risk patients. HFNC has gained popularity as a non-invasive form of respiratory support in acute healthcare settings. Nevertheless, evidence supporting its efficacy has only recently surfaced. The specified guidelines propose evidence-based recommendations for using HFNC in conjunction with other non-invasive respiratory support methods in adults with acute respiratory failure (ARF) [4]. However, there is limited guidance on using HFNC as a respiratory support tool during endoscopic procedures.
During bronchoscopy, certain physiological challenges may confer a heightened risk for the development of respiratory failure [5]:
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Sedation, necessary for patient toleration of the technique, may induce respiratory depression, requiring airway interventions such as mandibular traction, oropharyngeal airway device insertion, non-invasive ventilation (NIV), and even orotracheal intubation (OTI) and invasive mechanical ventilation.
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Other circumstances that arise during fiberoptic bronchoscopy (FOB) include:
  • The effective airway diameter is reduced when advancing the bronchoscope beyond the glottis; suctioning during FOB can result in alveolar recruitment loss and atelectasis formation.
  • Instillation of local anesthetics or saline solution during certain procedures, such as bronchoalveolar lavage (BAL), may cause alveolar flooding and affect the ventilation/perfusion ratio [6][7][8][9].
HFNC has been proposed as an advantageous oxygen delivery modality over conventional oxygen therapy (COT) during endoscopic procedures [10]. Because of its physiological effects [2], it is able to compensate for the patient’s inspiratory demands during the test, decrease anatomical dead space by achieving a washout of exhaled air, reduce resistance generated by the upper airways, and generate a mild positive expiratory pressure that allows greater lung recruitment, preventing the formation of atelectasis. The main drawback with respect to COT is the larger calibre of the high-flow cannula, which can make nasal access during FOB difficult.

2. HFNC in FOB

FOB is a fundamental diagnostic and therapeutic procedure in the assessment of the airways and lung parenchyma. It is an interventional technique that, like all procedures, can be associated with complications, including the development of hypoxaemia [6][7][8][10][11][12][13]. Hypoxaemia can also lead to serious cardiac events such as atrial or ventricular arrhythmias [8]. The occurrence of any of these complications may require interruption of the technique to access the airway and ensure adequate ventilation, reversal of anaesthesia, or prolongation of the procedure [8].
For this reason, adequate oxygen monitoring during the procedure by at least continuous pulse oximetry is essential, as is having a source of supplemental oxygen available in case hypoxaemia develops [12][13]. In recent years, an increasing number of clinical trials and meta-analyses have attempted to analyse the advantages and disadvantages of different devices that can be used for oxygen supplementation during FOB, including COT (with nasal cannula and oxygen mask with or without reservoir), HFNC, continuous positive airway pressure (CPAP), and NIV [6][7][8][10][11].

2.1. HFNC vs. Other Oxygen Supply Systems during FOB

2.1.1. HFNC vs. COT

COT consists of administering a certain flow rate of 100% oxygen, which is mixed with ambient air until the patient’s inspiratory flow is complete. Its main advantage is that it is accessible, inexpensive, and easy to use, but its drawback is that the FiO2 administered is variable and depends on the patient’s breathing pattern [6][10].
During FOB, COT via nasal cannula or simple oxygen mask has been shown to be effective in preventing desaturation episodes in patients with pre-procedural baseline oxygen saturation <93%, a history of chronic obstructive pulmonary disease (COPD), or during certain procedures such as FOB with BAL or bronchial brushing [6][14].
However, several studies and meta-analyses have shown that HFNC is superior to COT in improving oxygen saturation, reducing episodes of desaturation [6][7][8][10][11][15][16], reducing procedure interruptions [8][10][16], and avoiding additional airway manoeuvres [10][16]. This benefit is greater the lower the baseline oxygen level [6]; no effect was found on hypercapnia [7][8][10][11] or on the incidence of OTI [11].
During FOB with BAL, HFNC also appears superior to COT in preventing worsening oxygen saturation in both ambulatory patients [6][17] and hypoxaemic patients admitted to intensive care units [18][19], with no difference found in the rate of OTI [18].

2.1.2. HFNC vs. CPAP/NIV

CPAP systems generate continuous positive airway pressure, which reduces airway resistance and allows the recruitment of atelectatic lung areas [6]. Its main drawback is poor interface tolerance and the need for special masks with accessory ports for bronchoscope passage [13]. This system has been compared with COT in the randomised control trial (RCT) by Maitre et al. [20], with CPAP showing a higher oxygen saturation value during and after the procedure, with less need for ventilator support in the 6 h after FOB.
On the other hand, NIV has the advantages of CPAP, adding the beneficial effects of pressure support, which decreases the respiratory effort generated by the patient and ensures adequate ventilation in situations of deeper sedation. As a drawback, in addition to mask-related discomfort, it is more difficult to achieve adequate patient-ventilator interaction due to the presence of asynchronies caused by leaks and airway manipulation during the procedure [6][7]. NIV has been effectively applied during FOB in patients with respiratory failure, improving PaO2/FiO2 compared to patients treated with COT [21].
When comparing the two systems with respect to HFNC, an improvement in oxygenation has been observed with NIV/CPAP [6][7][22], especially in the most hypoxaemic patients [23]. Also, desaturation episodes below 90% were lower with NIV/CPAP [6][23]. Other meta-analyses found no difference in desaturation episodes [7]. On the other hand, Saksitthichok et al. [23] found greater dyspnoea after FOB in patients treated with NIV vs. HFNC. Therefore, although the results are contradictory, in patients with more severe hypoxaemia CPAP/NIV seems superior to HFNC. It also seems sensible that during procedures with deeper sedation, an NIV or even a laryngeal mask should be used to ensure adequate ventilation and gas exchange [6].

2.2. HFNC in Special Procedures and Situations

In special populations such as lung transplant patients or in certain techniques such as endobronchial ultrasound (EBUS) or foreign body removal, HFNC also appears superior to COT in preventing the development of hypoxaemia.
EBUS procedures pose an increased risk for the development of hypoxaemia during the technique due to the larger calibre of the bronchoscope and balloon inflation [8]. The efficacy of HFNC compared to COT has been evaluated in studies such as Irfan et al. [24] and Douglas et al. [25], where higher oxygen saturation during the test and decreased episodes of desaturation were observed.
For rigid bronchoscope foreign body removal, Abdel et al. [26] compared HFNC with apnoeic oxygenation, observing superior oxygenation in patients treated with HFNC and lower end-expiratory carbon dioxide after the procedure.

3. HFNC in Upper Gastrointestinal Endoscopy

3.1. HFNC vs. COT in Hypoxemia Prevention

Endoscopic upper gastrointestinal procedures are performed under sedation, with hypoxia being one of the most frequent complications arising from these procedures [27]. The advantage that HFNC could provide over COT is to prevent these episodes of desaturation as it can provide high and constant oxygen flows [28].
Finally, RCT in both low-risk hypoxia patients [29] and high-risk patients [30], defined as patients with body mass index (BMI) > 30 or diagnosed with obstructive sleep apnoea, or assessed as ASA (American Society of Anesthesiologists physical status class) III or IV, found no advantage of HFNC over COT in controlling hypoxaemia.

3.2. HFNC and Hyperoxia Management

Hyperoxia increases pulmonary oxidative stress, reduces alveolar surfactant levels, increases microcirculatory vasoconstriction, and may cause resorptive lung atelectasis by increasing the shunt effect [31]. For this reason, Zhang et al. [32] conducted a RCT evaluating optimal FiO2 with HFNC (FiO2 50% vs. 100%) in elderly patients, concluding that HFNC reduces hypoxia vs. COT without finding significant differences in hypoxaemia or adverse events with HFNC when FiO2 was 50% or 100%.

3.3. HFNC vs. COT in Hypercapnia Management

The high airflow used with HFNC has the beneficial effect of dead space lavage, which would facilitate both oxygenation and carbon dioxide removal under sedation [28]. However, in most studies with HFNC in upper gastrointestinal endoscopy, the carbon dioxide level has not been shown to be different between the HFNC vs. COT groups at the end of the endoscopic procedure [29][33].
In a post hoc analysis of the study by Mazzefi [33], in the group of at-risk patients with a diagnosis of COPD, it was observed that patients treated with HFNC during endoscopy under sedation had a significantly higher incidence of hypercapnia, showing no improvement in hypoxaemia control at the end of the endoscopic procedure compared to the group treated with COT.

3.4. HFNC vs. COT in a High-Risk Population

Conclusive data on the benefit of HFNC vs. COT in controlling hypoxaemia in upper gastrointestinal endoscopy under sedation may have been inconclusive because the different populations studied were highly heterogeneous. Therefore, studies have been conducted in an attempt to clarify the benefits for certain risk groups.
In the elderly, HFNC has been shown to be effective in controlling hypoxaemia vs. COT in both gastroscopy [32] and ERCP [34]. ERCP is usually performed with the patient in a prone position to facilitate the procedure, and sedation is usually deeper, which increases the risk of hypoxaemia and hypoventilation. In an RCT comparing HFNC vs. COT in elderly patients undergoing prone ERCP, HFNC demonstrated better control of hypoxaemia and decreased need for procedure interruption [35].
In patients defined as high-risk, obese patients with a BMI > 30, diagnosed with obstructive sleep apnoea or with ASA III or IV, there was no significant difference in the reduction of hypoxaemia or in the need for upper airway manoeuvres in patients treated with HFNC vs. those treated with COT in a post hoc study of an RCT [33], in subgroup studies of a meta-analysis [36], or in an RCT performed in this risk group [29].

4. HFNC in Surgical Procedures

4.1. Laryngeal Surgery

Surgical procedures performed over the airway pose a potential difficulty in ensuring patient ventilation during the procedure as the anaesthetist and surgeon must share the working space. Therefore, anaesthetic techniques that allow good exposure of the area while maintaining adequate oxygenation and ventilation are indispensable.
To accomplish this, there are several non-OTI techniques that can be used, such as supraglottic or subglottic jet ventilation or apnoea oxygenation with HFNC. HFNC may be useful in certain surgical procedures in low-risk (non-obese) patients, ensuring that it is possible to “rescue” the patient with supportive techniques such as jet ventilation or OTI in cases of decreased oxygen saturation.
Supraglottic jet ventilation is advocated over HFNC by some authors as being able to maintain a more stable oxygen saturation throughout the surgical procedure [37], but it also has disadvantages such as the risk of airway barotrauma, potential dissection or trauma of the supraglottis, and mucosal edoema [38].
The use of HFNC for spontaneous ventilation during surgery has been given several names: “STRIVE Hi” (SponTaneous Respiration using IntraVEnous anaesthesia and High-flow nasal oxygen) [39][40] or “NIDP” (non-intubated deep paralysis) [41]. Its advantages are due to the maintenance of good oxygenation due to its high flow and FiO2, which allows for uninterrupted surgery [42], upper airway lavage that helps maintain normal carbon dioxide levels, and the provision of warm, humidified air that more closely approximates physiological ventilation. Another important benefit of HFNC over OTI is that the duration of general anaesthesia in procedures with muscular paralysis and OTI is much longer than the duration of the surgery itself, especially in chordal microsurgery, where surgery can last even minutes, making the overall procedure inefficient [41].
HFNC has been shown to be a feasible and effective technique in laryngeal surgery during procedures that may be more prolonged [43][44][45]. Studies now show that apnoea techniques are safe and as effective as IOT in laryngeal microsurgery [46]. Recently, HFNC has also been tested in endoscopic surgical procedures of the hypopharynx, such as the correction of Zenker’s diverticulum, cricopharyngeal hypertrophy, and other upper esophageal disorders, with good results, allowing both intervention and recovery to be shorter [47].

4.2. Thoracic Surgery

In thoracic surgery, complete lobar resection has traditionally been considered the gold standard of treatment; however, anatomical segmentectomy has gained popularity in patients with compromised cardiopulmonary function as well as small and peripheral lung nodules [48].
Segmental resection by video-assisted thoracoscopic surgery (VATS), both multiportal and uniportal, has been commonly performed under general anaesthesia and OTI. Recent publications demonstrate that a less invasive anaesthetic technique during VATS for anatomical segmental resections in patients treated with HFNC is possible and safe [49], resulting in shorter anaesthetic induction time, shorter operative time, less intraoperative bleeding, and a shorter hospital stay [39]. It could even prevent intraoperative hypothermia, which is associated with bleeding and postoperative cardiac complications, especially in elderly patients [50].
Face masks and nasal oxygen cannula are the traditional and classic form of oxygen therapy, but new devices such as supraglottic ventilation, or HFNC, have demonstrated certain advantages over COT: supraglottic devices prevent upper airway obstruction caused by relaxation of the pharyngeal musculature during surgical anaesthesia, while HFNC has been associated with less post-surgical atelectasis [51]. However, when HFNC is used in VATS, there may also be some decreased muscle tone with reduced upper airway calibre and facial muscle relaxation with oral opening, which may decrease the efficacy of HFNC compared to supraglottic ventilation devices [37].

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Subjects: Respiratory System
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Marta Corral-Blanco
,
Javier Sayas-Catalán
,
Ana Hernández-Voth
,
Laura Rey-Terrón
,
Victoria Villena-Garrido
View Times: 257
Revisions: 2 times (View History)
Update Date: 04 Jan 2024
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