Airway and Sedation, “Answers”

Question #1: Do you reach for video laryngoscopy or direct laryngoscopy first for intubations?

Tracheal intubation is a fundamental skill for EM providers to master. Historically, direct laryngoscopy (DL) has been the modality of choice for endotracheal intubation, with a proven high success rate in the ED. However, video laryngoscopy (VL) devices have become increasingly popular and present. These devices havenumber of potential advantages including improved laryngeal exposure and visualization as well as allowing more experienced practitioners to observe the procedure during training. (Levitan, 2011). As VL devices are gaining wider use, some have made calls for their establishment as standard care. It is important to note that not all VL devices are equivalent. Some devices use standard geometry blades (which allow both direct and video laryngoscopy) while others have hyperangulated geometry blades which do not allow for direct laryngoscopy. Many devices interchangeably accept standard and hyperangulated blades.A full description of all of these devices is beyond the scope of this post.

Much of the early literature comparing VL to DL comes from observational studies. One prospective study at a level 1 trauma center enrolled all adult patients intubated in the ED over an 18-month span (Platts-Mills, 2009). Data collected included intubation indication, device used, and resident post-graduation year. The authors found no statistically significant difference in the primary outcome of first attempt success, but noted that VL intubation required significantly more time to complete (42 vs 30s). Another prospective study evaluating all ED intubations over a 2-year period found a statistically significant increase in first-attempt success for VL (78% vs 68%, adjusted OR 2.2), a result found more pronounced in a patient subgroup with pre-defined difficult airway predictors (OR 3.07) (Mosier, 2011).

Randomized controlled trial data is sparse. In 2013, Yeatts et al published an RCT among trauma patients at a single level 1 trauma center (Yeatts 2013). Patients requiring emergent intubation were randomized to DL or VL performed by an emergency medicine or anesthesia resident with at least one year of intubation experience. The authors found no significant difference in mortality, the primary outcome, but did observe an increased median duration of intubation in VL vs DL (56s vs 40s) with an associated increased incidence of hypoxia (50% vs 24%). The study had a number of inherent flaws including the fact that providers could selectively exclude patients at their discretion. Larger systematic reviews and meta-analyses have been limited by significant heterogeneity, and provided similarly murky results but suggest that VL may be the superior modality. One meta-analysis including only studies examining ICU intubations found that VL reduced the risk of difficult intubation, Cormack-Lehane 3 and 4 grade views, and esophageal intubations, and increased the likelihood of first-attempt success (De Jong, 2014).

Another meta-analysis included 17 trials and 1,998 patients to compare outcomes from VL vs DL (Griesdale, 2012). The authors found no significant difference in successful first-attempt intubation or time to intubation based on the use of Glidescope ® and DL. Interestingly, they did note that successful first-attempt intubation and time to intubation were improved using Glidescope ® in two studies specifically examining “non-expert” intubators, suggesting a valuable role for VL in less-experienced hands.

Further examining the potential increased efficacy of VL for less-experienced intubators, a prospective randomized control trial examined 40 fresh PGY-1s across varying disciplines (Ambrosio, 2014). All of the soon-to-be residents had not yet begun clinical duties and had individually performed no more than 5 live intubations in their training. After receiving training in both DL and VL, the participants were divided into groups and observed while intubating a difficult-airway manikin. The group using DL had significantly less successful intubations within 2 minutes (47% vs 100%) and increased overall mean time to intubation (69 vs 23s).

The skills required to use standard geometry blades with video are close to traditional direct laryngoscopy, whereas the more hyperangulated the blade, the easier is glottic visualization but the more challenging is tube delivery. Using hyperangulated blades is a somewhat different procedure, requiring a different skillset, than direct laryngoscopy or video laryngoscopy with a standard geometry blade. Many other forms of VL exist, and ultimately experience with one device does not guarantee to translate to another. (Sakles & Brown, 2012). For training purposes, a number of experts including Richard Levitan and Reuben Strayer support the use of standard geometry blades with video as they offer the benefits of video laryngoscopy while allowing training in direct laryngoscopy.

Bottom Line: Evidence suggests VL provides superior visualization in comparison to DL but improved outcomes have yet to be shown. The vast majority of airway experts support extensive training with both modalities.

Question #2: Do you use cricoid pressure during induction and paralysis?

Cricoid pressure (CP) refers to the application of firm pressure to the cricoid ring after positioning the patient’s neck in the fully extended position. It’s important to note that CP is different from external laryngeal manipulation, which acts to improve the laryngeal view during direct laryngoscopy. The pressure required to occlude the esophageal lumen is 30-44 Newtons (Wraight 1993). The goal of CP is to occlude the esophageal lumen in order to prevent regurgitation and gastric insufflation during intubation and particularly during bag mask ventilation. This maneuver is widely embraced in the anesthesiology world as standard care during induction. However, practice of routine CP has been questioned for over a decade and application in the Emergency Department setting is variable.

Although CP may have been used as far back as the 1770’s, the first published descriptions are from Sellick in 1961. Sellick applied CP during induction of anesthesia in 26 patients that were considered to be high risk for aspiration. In 3 of the patients, regurgitation occurred immediately after CP was removed (Sellick 1961). Sellick published a second article recounting a single case of a patient with CP applied who had the esophagus distended with saline solution via an esophageal tube. This patient did not regurgitate after distension (Sellick 1962). This report also contained Sellick’s personal account of 100 high-risk cases without regurgitation when CP was applied but six patients who regurgitated after CP was removed. These studies are severely flawed as there were no comparison groups, the technique’s proponent (Sellick) was the sole studied physician and it is unclear which patients had BMV prior to induction and intubation. Despite these shortcomings, CP was widely adopted after publication of Sellick’s studies.

Over the intervening decades, a significant amount of literature has emerged challenging the routine use of CP. There are four major issues with CP that should be addressed:

1) CP doesn’t occlude the esophagus as purported.

2) CP reduces airway patency.

3) CP obstructs the view of the airway.

4) CP has never been shown to prevent aspiration.

Let’s tackle each of these issues.

1) CP does not occlude the esophagus. This is the physiologic underpinning for the application of CP but was only demonstrated by Sellick in a select few cases. Subsequent literature has called this concept into question. MRI of healthy volunteers was performed with CP applied in order to better visualize the relationships of the cricoid cartilage and the esophagus (Smith 2003, Boet 2012). Both of these studies demonstrated that in many people the esophagus naturally lies lateral to the cricoid cartilage. Additionally, even those in whom the esophagus is not lateral, CP does not occlude the esophagus but rather displaces it laterally. Rice and colleagues, however, concluded that the location and movement of the esophagus was irrelevant to the efficacy of CP. They argue that the hypopharynx and cricoid move as a unit and that the esophagus becomes compressed against the longus colli muscle. Even if this is true, compression against a muscle is more likely to be overcome by the increased pressure that occurs during vomiting. In their MRI study of 24 healthy volunteers, they state that 35% of patients had obliteration of the esophageal lumen when CP was applied (Rice 2009). However, they show no data to support his claim.

Finally, ultrasound has been used in children to demonstrate that the anatomical effect of CP makes it’s utility questionable. Ultrasound was applied to 55 pediatric patients with and without application of CP. At baseline, the esophagus was lateral to the airway in 61% of patients and upon application of CP, all patients had displacement of the esophagus (Tsung 2012).

It is also important to note that the application of CP reduces esophageal sphincter tone allowing for gastric insufflation. This helps to explain why Sellick witnessed regurgitation after removal of CP. Overall, CP does not appear to cause compression of the esophagus but rather lateral displacement.

2) CP reduces airway patency and 3) CP obstructs the view of the airway. Anesthesia studies in the operating room have demonstrated the effect of CP on airway patency. Allman took 50 patients mechanically ventilated in the OR and measured expired tidal volume and peak inspiratory pressure (PIP) before and after application of CP. He found that after CP, both measures were significantly reduced reflecting increased airway obstruction (Allman 1995). Palmer and Ball went a step further. They endoscopically assessed 30 anesthetized patients for airway patency with and without variable forces applied to the cricoid cartilage. They found that as force increased, there was greater cricoid deformation, increasing likelihood of vocal cord closure and increasing likelihood of difficult ventilation (MacG Palmer 1999). At the recommended 44 N of pressure, 86% of men and 100% of women experienced difficulty with ventilation. Additionally, at this force, 26.6% of men and 78.5% of women had 100% cricoid deformation. CP additionally worsens laryngoscopic view and compromises ideal intubating conditions (Haslam 2005). In a study of 33 OR patients, full vocal cord visualization was reduced from 91% to 67% with application of CP (Smith 2002) and CP compressed 27% of patients vocal cords and impeded tracheal tube placement in 15% (Smith 2002). Finally, CP has also been shown to result in worse glottic view during video laryngoscopy (Oh 2013). Overall, CP interferes with “all aspects of airway management.” (Priebe 2012).

4) CP has never been shown to prevent aspiration. There are numerous cases reported in the literature of patients with CP in place who have aspirated. Perhaps the best literature on this comes from a retrospective, observational study in 2009 out of Africa. This study looked at 5000 patients undergoing C-sections. 61% of these patients had CP applied and 24 vomited during induction. Overall, there were 11 deaths attributed to aspiration with 10 of these coming from the CP group (Fenton 2009).

CP doesn’t do what it’s supposed to. It doesn’t occlude the esophagus to prevent aspiration but rather simply displaces the esophagus laterally. Application makes ventilation more difficult because it collapses the airway and the view of the cords is compromised. Intubating conditions are worsened by CP. Some have suggested application of CP initially and if the laryngoscopic view is poor or BMV is difficult, the CP can be removed. However, lower esophageal sphincter relaxation and gastric insuffulation during CP application increases the risk for regurgitation after removal of CP as witnessed by Sellick.

Bottom Line: In spite of over 50 years of application, there is minimal evidence to either the pathophysiologic basis or clinical utility of CP.. CP also appears to decrease the likelihood for 1st pass success. CP should not be performed routinely. External laryngeal manipulation, either by the operator or an assistant, may improve an otherwise suboptimal laryngeal view.

Question #3: How long do you keep patients NPO prior to procedural sedation?

Procedural sedation (PS) describes the use of a sedative or dissociative anesthetic to elicit a depressed level of consciousness that allows an unpleasant medical procedure to be performed with minimal patient reaction or memory. Unlike general anesthesia, PS agents and doses are chosen to maintain cardiorespiratory function and avoid endotracheal tube placement.or other advanced airway adjuncts. (Tintanelli, 2011). As the airway is not definitively protected, aspiration, or the inhalation of gastric contents into the respiratory tract, during the procedure is a potential adverse outcome with significant associated morbidity. Guidance on how to reduce aspiration risk has centered on pre-procedural fasting, though the optimal prescribed fasting times differs. Many Emergency Physicians question whether pre-procedural fasting actually provides any increased protection (Strayer, 2014).

Additionally, there are significant harms to procedural delay for fasting. Fractures and dislocations put increased risk on the neurovascular supply. Procedures may become more difficult to perform. Finally, prolonged fasting times increase ED length of stay. While fasting’s potential harms have been less studied than its efficacy, they should be kept in mind as the literature is examined (Godwin, 2014).

Much of the historical evidence regarding inter-procedural aspiration has come from the Anesthesia and Surgery literature (Green, 2002). One of the earliest reported potential cases of gastric contents as a complication of general aspiration comes from 1848, in a case in which a 15-year-old girl died 2 minutes after beginning to inhale chloroform while preparing for the removal of a toenail. This patient was sitting upright in an operating chair and was not observed vomiting, but as the autopsy revealed a food-distended stomach it was surmised that aspiration was a potential cause of death. (Maltby, 1990). Later, animal experiments involving the direct introduction of gastric aspirate into tracheas (Mendelson, 1946) suggested the danger of aspiration, and the concept of pre-procedural fasting gained acceptance.

Recent Anesthesia guidelines for preoperative fasting recommend a minimum fasting period of 2 hours following ingestion of clear liquids, 4 hours following breast milk, and 6 hours following infant formula or a light meal. (Apfelbaum, 2011). This recommendation is noted to apply to healthy patients undergoing elective procedures. It is important to note that adhering to the recommended fasting times does not guarantee the presence of an empty stomach. Underlying co-morbid conditions, pain and a number of other factors are associated with gastric emptying. As procedural sedation has become a common occurrence in the Emergency Department (ED), the question has arisen of how to translate anesthesia guidelines into Emergency Medicine practice.

Recent Emergency Medicine recommendations prescribed that maximal sedation depth be based on risk stratification of the type of liquid or food intake, the urgency of the procedure, and risk of aspiration. (Green, 2007). These authors acknowledged that their consensus recommendations stemmed in part from the general anesthesia literature. General anesthesia practice involves scenarios at higher risk for aspiration than ED PS but aspiration incidence remains low. Previously, Green et al suggested several reasons why ED PS is potentially safer than general anesthesia, including 1) not routinely placing an endotracheal tube, 2) maintenance of protective airway reflexes, 3) not using pro-emetic inhalation anesthetics. In their 2007 recommendations they suggest responsible consideration of risks/benefits of aspiration risk prior to pre-procedural fasting, though they ultimately note a paucity of literature suggesting more than a theoretical aspiration risk in ED PS.

Multiple studies in the Emergency Medicine literature have not supported the relationship between fasting state and procedural sedation-related aspiration. Agraway et al conducted a prospective case series enrolling all consecutive patients in a children’s hospital ED who underwent PS and recorded pre-procedural fasting state and adverse events (Agraway, 2003). Of the 905 patients with available data, 509 (56%) did not meet established fasting guidelines. 35 (6.9%) of these 509 patients had minor adverse effects as compared to 32 (8.1%) of the 396 patients who did meet fasting guidelines. No significant difference was found in median fasting duration between the two patient groups.

Three trials involving pediatric patients (Roback, 2004; Treston, 2004; Babi, 2005) undergoing procedural sedation with varying sedation agents examined fasting time & adverse effects. No statistically significant relationship was found between incidence of emesis or adverse effects and fasting time (Roback, Treston) or whether fasting guidelines were met (Babi). No episodes of aspiration were reported in any of the three studies.

Bell et al conducted a prospective observational series of 400 adult and pediatric patients undergoing procedural sedation with propofol and measured the percentage of patients whom met ASA fasting guidelines and looked at adverse outcomes (Bell, 2007). They found that 70.5% of those enrolled did not meet ASA fasting guidelines. There was no identified statistically significant difference between fasting status and adverse events (emesis, respiratory interventions). Additionally, there were no aspiration events in either group.

In 2014 an ACEP Clinical Policy committee reviewed these studies and ultimately questioned the utility of pre-procedural sedation fasting (Godwin, 2014). In a Level B evidence-based recommendation, they advised against delaying procedural sedation in the ED based on fasting time, as “preprocedural fasting for any duration has not demonstrated a reduction in the risk of emesis or aspiration when administering procedural sedation and analgesia.” The conclusions of the Clinical Policy recognized a dearth of study on the potential harms of delayed procedural sedation including pediatric hypoglycemia and worsening pathology.

Bottom Line: There is no evidence supporting delay of procedural sedation and analgesia based on fasting state in order to reduce the risk of vomiting and aspiration.The potential risk of aspiration involves multiple patient factors and should be considered on a case-by-case basis, and weighed against the harms associated withdelaying the sedation and procedure.

Question #4: When using ketamine for procedural sedation do you pretreat with benzodiazepines or anticholinergics?

Ketamine is a dissociative sedative-analgesic commonly used for painful or emotionally stressful procedures. When used at its dissociative dose of 1-2mg/kg IV (or 3-4 mg/kg IM), it is thought to exert its effects by effectively disconnecting the limbic and thalamocortical systems, leaving patients unaware of and unresponsive to external stimuli. Unlike other procedural sedation medications, respiratory status is maintained, making it a critical medication in the pediatric and adult Emergency Department. (Green, 2011)

As with any medication, Ketamine is not without its potential complications. Increased salivation and post-procedure emergence reactions are two concerning potential adverse outcomes, and anticholinergics and benzodiazepines, respectively, have been used as pre-treatment to blunt or prevent these effects (Haas, 1992; Strayer, 2008). Though the pharmacologic reasoning is sound for each medication and has been shown to work as treatment once patients become symptomatic, their common utility as pre-treatment is questionable.

Atropine and glycopyrrolate have commonly been administered to prevent hypersalivation and resulting adverse airway events, though their use by physicians has proven inconsistent. One prospective observational study (Brown, 2008) in a pediatric ER tracked the frequency of atropine pre-treatment and associated hypersalivation in 1,080 ketamine sedations over a 3-year period. Most (87%) of the patients in the study were not pretreated with an anticholinergic. Of the patients who received no pre-treatment, 92% were described as having no excess salivation. The authors concluded that atropine was not routinely required for prophylaxis.

A secondary analysis (Green, 2010) seemed to confirm these findings. Examining 8,282 ED ketamine sedations in pediatric patients from 32 previous series, this study found no statistically significant reduction in the number of adverse respiratory or airway events based on whether patients received atropine versus no anticholinergic drug. Interestingly, patients who received glycopyrrolate were actually found to have a significantly increased number of airway and respiratory events as defined by authors of the original studies. Taking these and other studies into account, a recent ACEP Clinical Policy on ketamine did not recommend the routine use of anticholinergics as pretreatment in adults or children. (Green, 2011)

Benzodiazepine pretreatment for the prevention of emergence reactions has been commonly recommended but erratically applied. A meta-analysis of 32 ED studies involving ketamine in pediatric patients (Green, 2009) was conducted to determine which clinical variables prevent recovery agitation. The authors found that 7.6% of patients experienced an emergency reaction though only 1.4% were judged to have “clinically significant” agitation. No apparent benefit or harm from pre-administrated benzodiazepines was found.

It has been suggested that emergence reactions are more frequent in adults than in children, and thus pre-treatment with benzodiazipines would prove more useful in this population. A double-blind randomized control trial pretreated 182 adult subjects receiving varying doses of ketamine with 0.03mg/kg IV midazoloam vs placebo (Sener, 2011).

Though the authors did not specify the intensity of the reaction that was experienced, they did find a significant decrease in recovery agitation with midazolam. An alternative to benzodiazepine prophylaxis is either pre-emergency or PRN benzodiazepine use (Strayer 2008). The current ACEP Clinical Policy recommends against the routine use of benzodiazepines in children but leaves the recommendation ambiguous for adults.

Bottom Line: Anticholinergics are not routinely needed for premedication in ketamine sedations. Benzodiazepines can be administered to adults but are not recommended routinely for children. Both medications should be available to use as PRN treatment.


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2 Responses to Airway and Sedation, “Answers”

  1. Matt King says:

    Great write-up guys! Thanks for all the wonderful work you do!

    Kind Regards,

  2. Pingback: LITFL Review 166 - LITFL

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