Name: Hypercapnic Hyperventilation to Accelerate Emergence from Inhaled Volatile Anesthetics: A Practical Method Using Standard Hospital Equipment (Video) | JoVE Journal
Uploaded: 2026-06-26T14:40:00.000+00:00
Duration: 8 min 41 s
Description: Learn a practical protocol for hypercapnic hyperventilation to accelerate emergence from volatile anesthesia using standard hospital equipment. This method enables controlled CO₂ rebreathing and enhanced anesthetic washout safely.

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The authors have no additional acknowledgments to declare. This study received no external funding.

This procedure is performed in compliance with institutional human research ethics and anesthesia practice guidelines. Apply this method only to patients in whom transient hypercapnia is not contraindicated, such as those without elevated intracranial pressure or pulmonary hypertension. Continuous monitoring of oxygen saturation, end-tidal CO&#8322;, anesthetic gas concentration, and hemodynamics is required throughout the procedure. The data shown are anonymized monitoring data from a single patient and were used in accordance with institutional policies regarding the educational or scientific use of clinical data. At hospital admission, patients provide broad consent for such use of their anonymized medical data (&#8220;consent at admission&#8221;); therefore, no study-specific informed consent or separate ethics approval was required.
NOTE: Patient selection criteria: Adult patients undergoing elective surgery under volatile anesthesia with expected standard emergence and stable intraoperative hemodynamics. Exclusion criteria: Do not apply this protocol to patients with intracranial hypertension, severe pulmonary hypertension, or uncompensated cardiac disease. Additional contraindications include any condition in which transient hypercapnia is considered unsafe based on established clinical indications and intraoperative anesthesiologist judgment. The hypercapnic hyperventilation protocol is initiated at the end of the surgical procedure, after cessation of surgical stimulation, when the clinician determines that emergence can be initiated.
CAUTION: Prior to initiating the procedure, verify that the anesthesia workstation allows safe modification of the breathing circuit, including temporary removal or bypass of the CO&#8322; absorber during ongoing mechanical ventilation. Ensure familiarity with the specific ventilator settings and alarm functions of the device in use. Confirm availability of continuous monitoring of airway pressure, ventilation parameters, and gas exchange throughout the procedure.
1. Preparation of the anesthesia circuit
NOTE: Disposal of used active charcoal filters should follow local institutional protocols for waste management of single-use anesthetic devices and materials potentially contaminated with volatile anesthetic agents.
<ol>
	<li>Turn off the volatile anesthetic vaporizer and ensure that no anesthetic agent is being delivered to the circuit.</li>
	<li>Set the inspired oxygen fraction (FiO&#8322;) to 1.0 by adjusting the anesthesia machine oxygen blender to deliver 100% oxygen.</li>
	<li>Reduce the fresh gas flow (FGF) to approximately 0.2 L&#183;min&#8315;1 using the flow control knobs on the anesthesia machine to promote rebreathing within the circuit.</li>
	<li>Attach a single active charcoal filter (as listed in Table of Materials) to the inspiratory limb of the anesthesia circuit immediately distal to the Y-piece, ensuring correct directional orientation according to manufacturer instructions as shown in Figure 1A&#8211;C.</li>
	<li>Confirm correct placement by verifying a secure, airtight connection without leaks and ensuring unidirectional gas flow through the filter.</li>
	<li>Refill the breathing circuit with 100% oxygen in case of unwanted disconnection as advised by the manufacturer (i.e., 1&#8211;2 s flush of the O2 button or temporary increase of fresh gas flow for 3&#8211;4 s to 15 L&#183;min&#8315;1). 
	NOTE: Some institutions permit limited reuse of active charcoal filters under defined conditions; adhere strictly to local policies regarding reuse and disposal.</li>
	<li>Disconnect the CO&#8322;-absorbing canister (soda lime) from the anesthesia machine to allow CO&#8322; accumulation within the breathing loop, as shown in Figure 1D&#8211;E. 
	NOTE: Ensure that the CO&#8322; absorber is completely bypassed or removed; partial removal may result in unpredictable CO&#8322; levels. Confirm correct configuration by verifying that the absorber is fully excluded from the breathing circuit (no gas flow through the canister) and by visual inspection of the bypass position before proceeding. Visually check that the bypass lever is in the correct position, and confirm the expected rise in end-tidal CO&#8322; after initiating rebreathing before proceeding.</li>
	<li>During initiation of hypercapnic hyperventilation, continuously monitor inspired volatile anesthetic concentration. 
	NOTE: Under low fresh gas flow (0.2 L&#183;min&#8315;1), a rapid decline of inspired volatile anesthetic concentration to near-zero levels (&#60;0.1 vol%) is expected within approximately 1&#8211;2 min. If inspired concentrations remain detectable beyond this period, replace the active charcoal filter immediately before continuing the protocol.</li>
	<li>Confirm that all circuit connections are airtight and that the anesthesia machine displays normal pressure and flow readings before proceeding.</li>
</ol>
2. Inducing hypercapnic hyperventilation
<ol>
	<li>General approach
	<ol>
		<li>Apply the protocol in either mechanically ventilated or spontaneously breathing patients, depending on intraoperative ventilation status at the end of surgery.</li>
	</ol>
	</li>
	<li>Mechanically ventilated patients
	<ol>
		<li>Set mechanical ventilation to achieve controlled hypercapnia.</li>
		<li>Increase tidal volume to 8&#8211;10 mL&#183;kg&#8315;1 ideal body weight and adjust minute ventilation to 10&#8211;12 L&#183;min&#8315;1.</li>
		<li>NOTE: These adjustments are operator-controlled and are used to regulate CO&#8322; levels indirectly by modifying alveolar ventilation. Avoid relying solely on respiratory rate adjustments, as tidal volume changes are more effective for controlled CO&#8322; retention.</li>
	</ol>
	</li>
	<li>Reduce fresh gas flow (see 1.3) and remove the CO&#8322; absorber (see 1.4) to allow controlled CO&#8322; accumulation. In this setting, rising CO&#8322; levels stimulate the respiratory drive, resulting in a physiological increase in minute ventilation without external ventilator adjustments.</li>
	<li>CO2 monitoring and adjustment of fresh gas flow
	<ol>
		<li>Continuously monitor end-tidal CO&#8322; (EtCO&#8322;) via capnography.</li>
		<li>Adjust fresh gas flow (FGF) in a stepwise and titrated manner based on real-time CO&#8322; trends.</li>
		<li>Increase FGF in small increments of approximately 0.1&#8211;0.3 L&#183;min&#8315;1 when EtCO&#8322; exceeds the target range (7.0&#8211;7.3 kPa; 52.5&#8211;55 mmHg).</li>
		<li>Reassess EtCO&#8322; within 1&#8211;2 min after each adjustment to evaluate response.</li>
		<li>Decrease FGF to a minimum of approximately 0.2 L&#183;min&#8315;1 when EtCO&#8322; is below the target range to facilitate CO&#8322; accumulation.</li>
		<li>Avoid abrupt or large adjustments to prevent overshooting and instability of CO&#8322; levels.</li>
		<li>Maintain FGF within a low-flow range (0.2&#8211;1.0 L&#183;min&#8315;1) throughout the procedure, titrated according to continuous capnographic feedback. 
		NOTE: The induced hypercapnia is intended to be transient and limited to the emergence phase of anesthesia. The target end-tidal CO&#8322; range (7.0&#8211;7.3 kPa; 52.5&#8211;55 mmHg) is typically maintained for several minutes during anesthetic washout and is discontinued immediately upon return of adequate spontaneous ventilation and clinical signs of emergence.</li>
	</ol>
	</li>
	<li>Stabilization: Increase fresh gas flow slightly (e.g., from 0.2 to 0.5 L&#183;min&#8315;1) once the target EtCO&#8322; range is reached to stabilize CO&#8322; levels. 
	NOTE: Avoid excessive CO&#8322; accumulation (&#62;8.0&#8211;8.5 kPa) to reduce the risk of respiratory acidosis or sympathetic overactivation.</li>
</ol>
3. Maintenance and monitoring
<ol>
	<li>Maintain FiO&#8322; at 0.7&#8211;1.0 during the entire procedure.</li>
	<li>Continue monitoring of inspiratory and expiratory volatile anesthetic concentrations using a calibrated gas analyzer (see Figure 2 for a representative monitor display).</li>
	<li>Observe the patient&#8217;s hemodynamics, oxygenation, and ventilation parameters until the inspired volatile anesthetic concentration decreases to zero.</li>
	<li>Assess for the return of spontaneous breathing and clinical signs of emergence (e.g., eye opening, purposeful movement, or response to verbal commands).</li>
	<li>Once the patient demonstrates adequate conditions, proceed with extubation according to standard institutional criteria.</li>
</ol>
4. Post-procedure steps
<ol>
	<li>Remove the active charcoal filter from the inspiratory limb immediately after completion of the protocol and prior to preparation for the next case.</li>
	<li>To reduce the risk of human error, verify visually and physically that the filter has been removed and that the standard circuit configuration has been restored. 
	CAUTION: Failure to remove the active charcoal filter can result in unintended adsorption of anesthetic gases and intraoperative awareness during subsequent cases11.</li>
	<li>Reconnect or reinstall the CO&#8322; absorber (soda lime) before initiating anesthesia for the next case.</li>
	<li>Confirm correct function by verifying normal CO&#8322; absorption and stable baseline capnography before induction. To mitigate omission risk, incorporate this step into the standard anesthesia machine checkout procedure between cases. 
	CAUTION: Failure to restore the CO&#8322; absorber can result in unintended rebreathing and intraoperative hypercapnia during subsequent cases. Given the critical nature of circuit modification, explicit post-procedure circuit checks are recommended. A standardized &#8220;return-to-baseline&#8221; verification of the anesthesia machine configuration should be performed before the next case to ensure that all temporary components are removed and the standard settings are restored.</li>
</ol>
5. Safety and troubleshooting
<ol>
	<li>Immediately terminate hypercapnic hyperventilation by increasing fresh gas flow to 10 L&#183;min&#8315;1 if any of the following occur: oxygen desaturation (SpO&#8322; &#60; 94%), hemodynamic instability (e.g., hypotension requiring intervention or clinically relevant arrhythmia), or excessive hypercapnia (EtCO&#8322; &#62; 8.5 kPa; 64 mmHg) despite corrective measures.</li>
	<li>After termination, immediately restore conventional anesthesia conditions by reinstalling the CO&#8322; absorber, returning fresh gas flow to standard settings, and resuming conventional ventilation parameters appropriate for the patient and anesthetic phase. 
	CAUTION: If unexpected resistance, leaks, or abnormal capnography values occur, inspect the breathing circuit, connectors, and the orientation of the active charcoal filter. Verify an airtight assembly and correct unidirectional flow through the filter before continuing the procedure. This protocol should only be performed by anesthesia providers experienced in mechanical ventilation, capnography interpretation, and volatile anesthetic management.</li>
</ol>
6. Pause points
CAUTION: The procedure can be paused after completion of step 1.6 (circuit setup) before induction of hypercapnic hyperventilation, if necessary. Do not pause the procedure once CO&#8322; accumulation has started. Continuous patient monitoring is mandatory during active hypercapnia.

<ol>
	<li>Vincent, K.F., et al. Current and developing approaches for facilitating emergence from general anesthesia. Anesthesiology. 2025;143:1049-89.</li>
	<li>Sakata, D.J., et al. Rapid recovery from sevoflurane and desflurane with hypercapnia and hyperventilation. Anesthesia &#38; Analgesia. 2007;105:79-81.</li>
	<li>Sakata, D.J., et al. Hypercapnic hyperventilation shortens emergence time from isoflurane anesthesia. Anesthesia &#38; Analgesia. 2007;104:587-91.</li>
	<li>Gopalakrishnan, N.A., et al. Hypercapnia shortens emergence time from inhaled anesthesia in pigs. Anesthesia &#38; Analgesia. 2007;104:815-821.</li>
	<li>Katznelson, R., et al. Post-operative hypercapnia-induced hyperpnoea accelerates recovery from sevoflurane anesthesia: a prospective randomized controlled trial. Acta Anaesthesiologica Scandinavica. 2013;57:623-30.</li>
	<li>Yaraghi, A., et al. Hypercapnic hyperventilation shortens emergence time from propofol and isoflurane anesthesia. Journal of Research in Pharmacy Practice. 2013;.2:24&#8211;28.</li>
	<li>Nakai, K., et al. Mild hypercapnia with hyperventilation attenuates recovery from anesthesia in elderly patients. Journal of Anesthesia. 2013;27:712&#8211;719.</li>
	<li>Brian, J.E. Carbon dioxide and the cerebral circulation. Anesthesiology. 1998;88:1365&#8211;1386.</li>
	<li>Halpern, P., et al. Middle cerebral artery flow velocity decreases, and electroencephalogram (EEG) changes occur as acute hypercapnia reverses. Intensive Care Medicine. 2003;29:1650-1655.</li>
	<li>Pecek, B., van Eijk, L.T., Bruhn, J. Hypercapnic hyperventilation as a technique to promote emergence after volatile anesthesia: a practical approach for European hospitals. JCA Advances. 2025;2:100179.</li>
	<li>Swerdlow, B.N. Intraoperative awareness with recall due to inadvertent use of activated charcoal filters. Open Journal of Anesthesiology. 2019;9:127-32.</li>
</ol>

Artificial intelligence&#8211;based tools (ChatGPT, OpenAI) were used during manuscript preparation to assist with language editing, grammar refinement, and readability improvement, as well as figure and image preparation. The AI tools were not used for study design, data collection, data analysis, or interpretation of results. All scientific content was developed, critically reviewed, and verified by the authors, who take full responsibility for the final manuscript. The authors declare that there are no competing interests. The concept of this study was published as a letter to the editor in JCA Advances, but the data and standardized method submitted here are not published elsewhere10.

The presented protocol describes a practical approach to inducing hypercapnic hyperventilation using standard anesthesia equipment. The critical steps for implementation include complete removal or bypassing of the CO&#8322; absorber, reduction of fresh gas flow to approximately 0.2 L&#183;min&#8315;1, and continuous monitoring of end-tidal CO&#8322; (EtCO&#8322;). Accurate control of CO&#8322; accumulation is important for reaching the target range of 7.0&#8211;7.3 kPa (52.5&#8211;55 mmHg) without exceeding s...

Recently, there has been an increased focus on approaches aimed at facilitating emergence from general anesthesia1. Delayed emergence and residual anesthetic effects remain clinically relevant challenges, particularly when rapid neurological assessment and operating room efficiency are desired. One of these approaches is hypercapnic hyperventilation. Hypercapnic hyperventilation is a controlled anesthetic emergence technique in which arterial carbon dioxide (CO&#8322;) levels are deliberately elevated to enhance minute ventilation and is thought to facilitate the washout of volatile anesthetics at the end of surgery2,3,4,5,6,7. By inducing mild hypercapnia, this approach increases cerebral blood flow8,9 and is associated with stimulation of the respiratory centers in the brainstem, which may support the return to spontaneous ventilation and consciousness. The overall goal of the method is to shorten the time to support timely awakening and extubation after volatile anesthesia while maintaining patient safety and minimizing residual anesthetic effects.
Conventional emergence strategies rely primarily on high fresh gas flows to eliminate volatile anesthetics. Although effective, this can be time-consuming and may not optimally support cerebral elimination of anesthetic agents. This represents a largely passive elimination strategy that does not actively engage physiological mechanisms known to influence anesthetic clearance. Hypercapnic hyperventilation aims to address these limitations by coupling two physiological mechanisms&#8212;CO&#8322;-mediated respiratory drive and increased cerebral perfusion9&#8212;that are thought to enhance anesthetic clearance from both pulmonary and cerebral compartments. Clinical studies have suggested that this strategy can significantly reduce emergence times and improve recovery quality compared to standard approaches.
A commercial system is available which utilizes an extendable rebreathing loop in combination with an active charcoal filter device7. This device integrates rebreathing and anesthetic gas scavenging within a single-use system designed to accelerate anesthetic elimination. However, this device is currently not widely available in Europe and other regions, limiting its clinical adoption. As a result, despite supportive evidence in the literature, the practical application of this technique remains limited in many clinical settings.
The present protocol describes a practical and accessible alternative for inducing hypercapnic hyperventilation using standard anesthesia equipment commonly available in most European hospitals. By removing the CO&#8322; absorber and reducing the fresh gas flow, controlled rebreathing is facilitated, while an active charcoal filter eliminates residual volatile anesthetics from the breathing loop. This method allows anesthesia providers to replicate the physiological benefits of hypercapnic hyperventilation without specialized commercial devices10. This protocol, therefore, aims to bridge the gap between the technique as described in the literature and its feasibility in daily clinical practice.
In addition to its simplicity and low cost, this approach offers an educational advantage by allowing clinicians to explore the physiological interplay between ventilation, CO&#8322; retention, and anesthetic elimination. The described technique is appropriate for adult patients without contraindications to transient hypercapnia, such as elevated intracranial pressure or pulmonary hypertension. When applied under proper monitoring and within defined safety limits, hypercapnic hyperventilation may represent an additional option in the modern anesthesia emergence repertoire, allowing readers to assess whether this method is suitable for their clinical environment and patient population.

<table><tbody><tr><td>Disposable CO&lt;sub&gt;2&lt;/sub&gt; absorber, IS Can&amp;trade;, Spherasorb&amp;trade;&amp;nbsp;</td><td>Intersurgical, Workingham, United Kingdom</td><td>2196000</td><td>Disposable CO2 absorber canister, removed during the procedure</td></tr><tr><td>Dr&amp;auml;ger Atlan A350</td><td>Dr&amp;auml;gerwerk, L&amp;uuml;beck, Germany</td><td>8621500</td><td>Standard mechanical ventilator with circle breathing system, capnography and anesthetic gas analysis</td></tr><tr><td>IntelliVue X3 patient monitor</td><td>Philips, Eindhoven, The Netherlands</td><td>X3 867030</td><td>Standard patient monitoring module (ECG, SpO2, NIBP)&amp;nbsp;</td></tr><tr><td>Vapor-Clean filter</td><td>Dynasthetics, Salt Lake City, USA</td><td>SKU 101</td><td>www.dynasthetics.com/Vapor-Clean/</td></tr></tbody></table>

hypercapnic hyperventilation to accelerate emergence from inhaled volatile anesthetics: a practical method using standard hospital equipment

Hypercapnic Hyperventilation to Accelerate Emergence from Inhaled Volatile Anesthetics: A Practical Method Using Standard Hospital Equipment

Hypercapnic hyperventilation is a technique used to support emergence from volatile anesthesia by allowing a controlled elevation of arterial carbon dioxide (CO&#8322;) levels. The resulting hypercapnia increases minute ventilation, enhances the washout of anesthetic gases from the lungs, and increases cerebral blood flow, which may facilitate faster elimination of volatile agents from brain tissue. Commercial devices have been developed to achieve this effect; however, their availability is limited in many regions. This protocol describes a practical alternative approach using standard anesthesia equipment commonly available in European hospitals. By temporarily removing the CO&#8322; absorber and reducing fresh gas flow, controlled CO&#8322; rebreathing is facilitated, while an active charcoal filter eliminates residual volatile anesthetics from the circuit. The protocol provides step-by-step guidance to help achieve the desired end-tidal CO&#8322; levels safely and efficiently. This method offers a practical and low-cost way to induce hypercapnic hyperventilation, which may be associated with faster emergence from anesthesia under appropriate clinical conditions.

This section demonstrates the physiological and clinical effects of the hypercapnic hyperventilation technique in a representative case. As shown in Figure 1, the experimental setup enables controlled bypass of the CO&#8322; absorber and integration of an active charcoal filter, thereby allowing simultaneous CO&#8322; rebreathing and volatile anesthetic scavenging. This configuration forms the basis for the observed physiological changes with controlled CO&#8322; elevation and accelerated an...

This protocol demonstrates a practical method to induce controlled hypercapnic hyperventilation using standard anesthesia equipment. The technique facilitates rapid emergence from volatile anesthesia by accelerating anesthetic washout via elevated CO&#8322; levels and enhanced ventilation, providing a feasible alternative when proprietary commercial systems are unavailable.

Hypercapnic hyperventilation is a technique used to support emergence from volatile anesthesia by allowing a controlled elevation of arterial carbon ...

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Learn a practical protocol for hypercapnic hyperventilation to accelerate emergence from volatile anesthesia using standard hospital equipment. This method enables controlled CO₂ rebreathing and enhanced anesthetic washout safely.

Hypercapnic Hyperventilation to Accelerate Emergence from Inhaled Volatile Anesthetics: A Practical Method Using Standard Hospital Equipment (Video) | JoVE Journal

Hypercapnic Hyperventilation to Accelerate Emergence from Inhaled Volatile Anesthetics: A Practical Method Using Standard Hospital Equipment

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