How is correct endotracheal tube placement confirmed?

The most reliable bedside confirmation is continuous waveform capnography, which detects exhaled carbon dioxide from the lungs; it is used alongside visualization of the tube passing the cords and clinical signs such as bilateral chest movement and breath sounds.

Why is intubating a critically ill patient considered higher risk?

Critically ill patients often have little physiological reserve, hypoxemia, and unstable circulation, so complications such as severe oxygen desaturation and cardiovascular collapse are more frequent than during elective intubation, which is why dedicated guidelines emphasize preoxygenation and failure planning.

Endotracheal Intubation

Endotracheal intubation is the placement of a tube through the mouth or nose, past the vocal cords, into the trachea to secure and control the airway. It allows mechanical ventilation, protects against aspiration, and provides a route for airway suctioning, making it one of the defining procedures of emergency and critical care.

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Definition

Endotracheal intubation is the insertion of a cuffed tube through the larynx into the trachea to establish a secure, protected airway that permits positive-pressure ventilation and airway clearance.

Scope

The entry covers the purpose of tracheal intubation, the central role of laryngoscopy (direct and video) and confirmation of correct placement, the concept of the difficult airway, and how critically ill patients differ from elective surgical patients. It is a methodological and educational reference and provides no procedural instructions, drug regimens, or patient-specific advice.

Key concepts

Direct and video laryngoscopy
Confirmation of tube placement (waveform capnography)
First-pass success
The difficult airway and predictors
Rapid sequence induction and intubation
Preoxygenation and physiological optimization
Failed-intubation and rescue planning

Mechanisms

Under laryngoscopy the operator visualizes the glottis and passes a tube between the vocal cords into the trachea, then inflates a cuff to seal the airway and confirms placement, most reliably by continuous waveform capnography detecting exhaled carbon dioxide. In critically ill patients, intubation is higher risk than in the elective setting because of limited physiological reserve, hypoxemia, and hemodynamic instability, which is why guidelines such as Higgs et al. (2018) emphasize preoxygenation, physiological optimization, planning for failure, and human-factors considerations. When the airway proves difficult, structured stepwise algorithms guide escalation from optimized laryngoscopy to supraglottic rescue and, ultimately, front-of-neck access (Frerk et al., 2015; Apfelbaum et al., 2022).

Clinical relevance

Tracheal intubation is performed across emergency departments, operating rooms, and ICUs, and complications of intubation in the critically ill are an important and partly preventable source of harm. This entry summarizes how the procedure and its safety frameworks are conceived and studied; it is not a basis for individual airway, medication, or procedural decisions.

Epidemiology

Intubation in critically ill patients carries substantially higher rates of complications, including severe hypoxemia and cardiovascular instability, than intubation under controlled elective conditions, a disparity that motivated the dedicated critical-illness guidance of Higgs et al. (2018). First-pass success is widely used as a quality and safety metric because repeated attempts are associated with more complications.

History

Tracheal intubation evolved from nineteenth- and early twentieth-century laryngoscopy into a routine technique with the rise of anesthesia and mechanical ventilation. Successive national audits and guidelines, including the Difficult Airway Society algorithms (Frerk et al., 2015), the critically-ill-adult guidelines (Higgs et al., 2018), and the American Society of Anesthesiologists updates (Apfelbaum et al., 2022), progressively standardized difficult-airway management and introduced video laryngoscopy and human-factors thinking.

Debates

Video versus direct laryngoscopy as the default: Whether video laryngoscopy should be the routine first-line tool rather than reserved for anticipated difficulty has been debated; guidelines increasingly emphasize its availability and immediate access, while the optimal default in every setting continues to be discussed.

Seminal works

higgs-2018
frerk-2015
apfelbaum-2022

Frequently asked questions

How is correct endotracheal tube placement confirmed?: The most reliable bedside confirmation is continuous waveform capnography, which detects exhaled carbon dioxide from the lungs; it is used alongside visualization of the tube passing the cords and clinical signs such as bilateral chest movement and breath sounds.
Why is intubating a critically ill patient considered higher risk?: Critically ill patients often have little physiological reserve, hypoxemia, and unstable circulation, so complications such as severe oxygen desaturation and cardiovascular collapse are more frequent than during elective intubation, which is why dedicated guidelines emphasize preoxygenation and failure planning.