What Is a Bougie in Medical Airway Management?

A bougie is a long, thin, semi-rigid introducer that clinicians slide into the trachea when they cannot easily pass a breathing tube during intubation. Formally called a tracheal tube introducer, it acts as a guide rail: once the bougie is in the airway, a standard endotracheal tube is threaded over it and into position. The device has been a cornerstone of difficult-airway management for decades, and a large meta-analysis of 18 studies found that using one raises first-attempt intubation success by about 11 percent overall, with a much larger benefit when the view of the vocal cords is poor.

What It Looks Like and How the Tip Matters

The classic bougie is roughly 60 centimeters long and about 5 millimeters in diameter. It is flexible enough to bend with the airway’s curves yet stiff enough to be steered toward the tracheal opening. The most important design feature is the angled tip, called a coudé tip, which curves upward at the distal end. That curve lets a clinician direct the bougie anteriorly, toward the trachea, even when the vocal cords are barely visible or completely out of view. In a manikin study where 30 anesthetists attempted placement in a simulated difficult airway, the coudé-tipped bougie had a 43 percent success rate while a straight-tipped version succeeded zero percent of the time.¹ That finding is why virtually all bougies sold today come with an angled tip.

The original device, known as the Eschmann tracheal tube introducer, was made from woven polyester coated in resin, giving it the informal name “gum elastic bougie.” Most hospitals have since shifted to single-use plastic versions from manufacturers like Portex and Frova, which differ from the original in stiffness and tip behavior. Those material differences turn out to matter for safety, a point covered further below.

How Clinicians Confirm It Is in the Right Place

Placing a bougie is partly a tactile exercise. Two physical signs tell the operator the device has entered the trachea rather than the esophagus. The first is a series of clicks felt through the shaft as the angled tip bumps along the cartilage rings of the trachea. The second is “hold-up,” a sensation of resistance when the bougie has been advanced far enough that its tip reaches a small bronchus and cannot go further. In a study of 100 intubation attempts, clicks were felt in about 90 percent of tracheal placements, and hold-up occurred in 100 percent of them. Neither sign appeared when the bougie accidentally entered the esophagus.² These confirmation signs remain a core part of difficult-airway training, though hold-up must be elicited gently, especially with newer single-use devices.

The Evidence for First-Attempt Success

Getting the breathing tube placed on the first try matters. Every additional attempt at intubation raises the risk of low oxygen levels, aspiration, and airway swelling. A 2023 systematic review and meta-analysis pooling data from over 9,000 patients found that bougie use was associated with a pooled risk ratio of about 1.11 for first-attempt success compared with intubation without a bougie.³ That overall number masks a much stronger effect in the patients who need it most. In the subgroup with a poor laryngeal view (Cormack-Lehane grade III or IV, meaning the vocal cords are mostly or entirely hidden), the bougie boosted first-attempt success by roughly 60 percent.

Real-world prehospital data tell a similar story. When one emergency medical service switched to routine bougie use for all out-of-hospital intubations, first-attempt success climbed from 70 percent to 77 percent. The improvement showed up across every grade of laryngeal view, but it was most dramatic when conditions were worst: success with the most difficult views roughly doubled.⁴ Based on this kind of evidence, some researchers now argue the bougie should be used routinely on the first attempt in emergency intubations, not held in reserve as a rescue device.

Bougie Versus Stylet

The bougie’s main competitor is the stylet, a malleable metal wire inserted inside the endotracheal tube to give it a pre-shaped curve. In routine intubations with a reasonable view of the airway, stylets perform comparably. A multicenter trial of critically ill adults found no significant difference in first-attempt success between the bougie (about 80 percent) and a styletted tube (about 83 percent).⁵

The picture changes when the airway is difficult. A meta-analysis focused specifically on patients with difficult airways found the bougie achieved a first-attempt success rate of about 94 percent compared with roughly 76 percent for the stylet approach, a substantial gap.⁶ Earlier simulation work found a similar pattern: after two attempts in a difficult-airway scenario, 96 percent of bougie-first participants had the tube correctly placed versus 66 percent who started with a stylet.⁷

The practical takeaway is that for a straightforward intubation with a good view, either device works. When the view is poor, the bougie has a clear edge.

Use With Videolaryngoscopes

Modern airway management increasingly relies on videolaryngoscopes, cameras mounted on a blade that display the vocal cords on a screen. These scopes generally provide a better view than traditional direct laryngoscopy, but they can create a different problem: the acute angle of the blade, especially on hyperangulated designs, makes it harder to steer the breathing tube around the corner and through the cords. The bougie’s flexibility helps bridge that gap.

A randomized trial in patients with anticipated difficult airways found that using a bougie with a hyperangulated videolaryngoscope yielded 98 percent first-attempt success, compared with 88 percent when a stylet was used instead.⁸ A separate trial in critically ill patients reported an even wider margin: 99 percent with a flexible-tip bougie versus 83 percent with a stylet.⁹

Not every videolaryngoscope design shows the same advantage. In one study of critical care air transport using a standard-geometry video scope (the C-MAC), bougie and stylet first-attempt success rates were statistically indistinguishable at 82 percent and 86 percent, respectively.¹⁰ The pattern seems to be that the steeper the angle of the videolaryngoscope blade, the more the bougie helps, because the acute curve makes the stylet’s rigid pre-shape a disadvantage.

The Tube Hang-Up Problem

One of the most common frustrations with bougies is “hang-up,” where the endotracheal tube catches on structures at the entrance to the trachea as it slides over the bougie. The tube’s beveled tip can snag on the arytenoid cartilages, the small structures flanking the vocal cords. The standard fix is to pull the tube back about two centimeters, rotate it 90 degrees counterclockwise so the bevel faces a different direction, and re-advance it.¹¹ This simple maneuver resolves most cases.

Hang-up tends to be more of an issue with videolaryngoscopy. Because the camera gives a view without needing to align the mouth and trachea in a straight line, the bougie often enters the glottis at an oblique angle. That angulation means the tube encounters more resistance as it tries to follow.¹² Awareness of this issue and readiness with the counterclockwise rotation trick are key parts of bougie training.

Safety Risks and the Hold-Up Sign Controversy

The bougie is generally considered a safe device, but it is not without risk. Forceful advancement can injure the tracheal wall, and the stakes are higher with some of the newer single-use bougies. A bench study measured the force generated at hold-up with the original reusable Eschmann bougie versus the Frova single-use bougie. The Eschmann produced a hold-up force of about 1.0 newton, close to the roughly 0.9 newtons needed to perforate an airway. The Frova, being stiffer, generated a hold-up force averaging 5.2 newtons, more than five times the perforation threshold.¹³ The researchers concluded that eliciting the hold-up sign with single-use bougies is dangerous and should be abandoned. With the reusable Eschmann, the margin is razor-thin, so even there, caution is warranted.

Case reports reinforce this concern. At least one published case describes a disposable bougie dissecting the tracheal lining, creating a flap of tissue that completely blocked the airway and required an emergency surgical opening in the neck to restore breathing.¹⁴ While such events are rare, they underline why gentle technique matters. The tracheal click sign is safer than the hold-up sign for confirming placement, especially with disposable devices.

Reusable Versus Disposable Bougies

The shift from reusable to single-use bougies was driven partly by infection control and partly by supply chain convenience, but it introduced trade-offs. The original reusable Eschmann bougie had a supple, slightly floppy feel that experienced clinicians valued. Single-use models tend to be stiffer, which can make them easier to direct toward the tracheal opening but also raises the injury risk just described.

Performance differences show up in studies. In a paramedic simulation of difficult intubation, a malleable stylet achieved tracheal intubation within 30 seconds in 57 percent of attempts. The Portex single-use bougie succeeded 30 percent of the time, the Frova single-use bougie 27 percent, and the Portex reusable bougie only 8 percent. Participants rated the reusable bougie significantly harder to use.¹⁵ The reusable device’s floppiness, an asset in experienced hands, becomes a liability for operators with less bougie experience.

Contamination is another consideration for reusable models. A study found that about a third of reusable bougies tested positive for bacterial contamination before a cleaning intervention. Introducing chlorhexidine wipes brought the contamination rate to zero.¹⁶ Hospitals that still use reusable devices need rigorous decontamination protocols.

Prehospital and Field Use

Outside the hospital, intubation conditions are often worse: poor lighting, limited positioning, patient access constrained by a vehicle or rubble, and operators who intubate less frequently than hospital-based anesthesiologists. The bougie’s simplicity makes it appealing in this context. A French prehospital study found that after standard intubation failed in about 3 percent of field patients, the bougie succeeded in 80 percent of those difficult cases on the first attempt.¹⁷

A systematic review of prehospital intubation studies found that bougies showed a statistically significant boost in first-pass success when combined with video technology, but the advantage disappeared when only direct laryngoscopy was used in the field. The review also noted that stylets tended to be faster to use, while bougies were rated easier to handle by prehospital providers.¹⁸ These findings suggest the ideal prehospital strategy may depend on whether video equipment is available.

Pediatric Airways

Children’s airways are smaller, more anterior, and more easily injured than adults’. Smaller-diameter bougies exist for pediatric use, and a narrative review described them as cost-effective and adaptable tools.¹⁹ However, the clinical evidence in children is thinner and less encouraging than in adults. A study of critically ill children found that first-attempt success was actually slightly lower with a bougie (72 percent) than without one (78 percent), though the difference was not statistically significant. Procedural complications occurred in 38 percent of the bougie group versus 51 percent of the no-bougie group, a potential safety signal that also did not reach significance.²⁰

The pediatric data remain limited, and most experts still consider the bougie a valuable rescue option in children when standard techniques fail. But routine first-line use in pediatric intubation does not yet have the evidence base it does in adults.

The Bougie in Emergency Surgical Airways

When intubation through the mouth fails entirely and the patient cannot be oxygenated, the last resort is a surgical airway through the front of the neck. The bougie plays a role here, too. In the scalpel-bougie cricothyroidotomy technique, the clinician makes a horizontal cut through the cricothyroid membrane, inserts the bougie’s coudé tip into the trachea, and then slides a breathing tube over it, just as in oral intubation. A bench study using porcine models found this technique was completed in a median of about 45 seconds, roughly half the time needed for a needle-based commercial kit.²¹ A cadaver study of ultrasound-guided bougie-assisted cricothyroidotomy reported a median completion time of about 26 seconds with only one failure in 21 attempts.²² The scalpel-bougie approach has become a preferred technique in many difficult-airway algorithms because it is fast, uses equipment already present on an airway cart, and avoids reliance on specialized kits.

Using a Bougie Through a Supraglottic Airway

Supraglottic airways like the laryngeal mask airway (LMA) or i-gel sit above the vocal cords and provide ventilation without entering the trachea. In some scenarios, clinicians want to convert from a supraglottic device to a definitive endotracheal tube. The bougie can serve as a bridge: it is passed through the supraglottic device, guided into the trachea, and then a tube is railroaded over it. A review of this technique found that blind insertion of a bougie through a supraglottic airway had a high failure rate, but success improved substantially when a flexible camera (bronchoscope) was used to guide the bougie.²³ One trial demonstrated that both the i-gel and the LMA Classic could serve as a conduit for bougie-guided intubation with stable vital signs throughout the procedure.²⁴

Next-Generation Designs

The traditional bougie is a static device: once manufactured, its curve is fixed. A newer category called dynamic or articulating bougies allows the operator to actively steer the tip during insertion. A systematic review and meta-analysis comparing dynamic bougies to standard ones found that in clinical trials, dynamic bougies did not significantly improve first-attempt success overall. But in patients with difficult airways specifically, they raised first-attempt success and shortened intubation time by about five seconds.²⁵

A recent manikin study evaluated five different introducers, including both static and dynamic designs, with a hyperangulated videolaryngoscope. The static Portex bougie had the lowest first-attempt success in the difficult scenario at 33 percent, while steerable and hybrid designs ranged from 60 to 93 percent. The manufacturer-matched stylet for the videolaryngoscope outperformed all of them.²⁶ These findings suggest the future of airway introducers is likely a blend of bougie and stylet features, with active tip control and device-specific engineering rather than one generic tool for all scopes.

Training Considerations for Novice Providers

Bougie skill is not automatic. Like any airway tool, it requires practice. A simulation study with novice learners compared intubation methods on a third attempt: standard direct laryngoscopy succeeded 65 percent of the time, digital (finger-guided) intubation succeeded 53 percent, and bougie-assisted digital intubation reached 90 percent.²⁷ The bougie gave inexperienced hands a significant performance boost, partly because it decouples the problem: the operator can focus first on getting the thin bougie past the cords, and then separately on advancing the tube. Splitting those two tasks reduces the cognitive load of a high-stress procedure.

That said, the technique is not intuitive for everyone. Operators unfamiliar with the hold-up and click signs may not recognize correct tracheal placement, and inexperienced users are more likely to apply excessive force. Simulation training that emphasizes gentle advancement and the counterclockwise rotation maneuver appears to be the most effective way to build safe, lasting bougie skills.