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<meta name="robots" content="INDEX,FOLLOW,NOARCHIVE" /><meta name="citation_inbook_title" content="StatPearls [Internet]" /><meta name="citation_title" content="Assist-Control Ventilation" /><meta name="citation_publisher" content="StatPearls Publishing" /><meta name="citation_date" content="2023/04/24" /><meta name="citation_author" content="Andres L. Mora Carpio" /><meta name="citation_author" content="Jorge I. Mora" /><meta name="citation_pmid" content="28722886" /><meta name="citation_fulltext_html_url" content="https://www.ncbi.nlm.nih.gov/books/NBK441856/" /><link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" /><meta name="DC.Title" content="Assist-Control Ventilation" /><meta name="DC.Type" content="Text" /><meta name="DC.Publisher" content="StatPearls Publishing" /><meta name="DC.Contributor" content="Andres L. Mora Carpio" /><meta name="DC.Contributor" content="Jorge I. Mora" /><meta name="DC.Date" content="2023/04/24" /><meta name="DC.Identifier" content="https://www.ncbi.nlm.nih.gov/books/NBK441856/" /><meta name="description" content="Mechanical ventilation is a lifesaving procedure that is often performed when patients require respiratory support.[1] Assist-control (AC) mode is one of the most common methods of mechanical ventilation in the intensive care unit[2]." /><meta name="og:title" content="Assist-Control Ventilation" /><meta name="og:type" content="book" /><meta name="og:description" content="Mechanical ventilation is a lifesaving procedure that is often performed when patients require respiratory support.[1] Assist-control (AC) mode is one of the most common methods of mechanical ventilation in the intensive care unit[2]." /><meta name="og:url" content="https://www.ncbi.nlm.nih.gov/books/NBK441856/" /><meta name="og:site_name" content="NCBI Bookshelf" /><meta name="og:image" content="https://www.ncbi.nlm.nih.gov/corehtml/pmc/pmcgifs/bookshelf/thumbs/th-statpearls-lrg.png" /><meta name="twitter:card" content="summary" /><meta name="twitter:site" content="@ncbibooks" /><meta name="bk-non-canon-loc" content="/books/n/statpearls/article-17914/" /><link rel="canonical" href="https://www.ncbi.nlm.nih.gov/books/NBK441856/" /><link rel="stylesheet" href="/corehtml/pmc/css/figpopup.css" type="text/css" media="screen" /><link rel="stylesheet" href="/corehtml/pmc/css/bookshelf/2.26/css/books.min.css" type="text/css" /><link rel="stylesheet" href="/corehtml/pmc/css/bookshelf/2.26/css/books_print.min.css" type="text/css" /><style type="text/css">p a.figpopup{display:inline !important} .bk_tt {font-family: monospace} .first-line-outdent .bk_ref {display: inline} </style><script type="text/javascript" src="/corehtml/pmc/js/jquery.hoverIntent.min.js"> </script><script type="text/javascript" src="/corehtml/pmc/js/common.min.js?_=3.18"> </script><script type="text/javascript">window.name="mainwindow";</script><script type="text/javascript" src="/corehtml/pmc/js/bookshelf/2.26/book-toc.min.js"> </script><script type="text/javascript" src="/corehtml/pmc/js/bookshelf/2.26/books.min.js"> </script>
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<div class="pre-content"><div><div class="bk_prnt"><p class="small">NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.</p><p>StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. </p></div></div></div>
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<div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><h1 id="_NBK441856_"><span class="title" itemprop="name">Assist-Control Ventilation</span></h1><p class="contrib-group"><h4>Authors</h4><span itemprop="author">Andres L. Mora Carpio</span>; <span itemprop="author">Jorge I. Mora</span><sup>1</sup>.</p><h4>Affiliations</h4><div class="affiliation"><sup>1</sup> University of Pennsylvania</div><p class="small">Last Update: <span itemprop="dateModified">April 24, 2023</span>.</p></div><div class="body-content whole_rhythm" itemprop="text"><div id="article-17914.s1"><h2 id="_article-17914_s1_">Continuing Education Activity</h2><p>Mechanical ventilation is a common intervention used to treat patients with acute respiratory failure. Assist-control ventilation is the most common setting used in the ICU and is the only setting with proven mortality benefits in patients with ARDS. This activity outlines the management of patients being ventilated on assist control and describes the importance of the interprofessional team in dealing with issues pertaining to the ventilator.</p><p>
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<b>Objectives:</b>
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<ul><li class="half_rhythm"><div>Explain the definition of assist control ventilation.</div></li><li class="half_rhythm"><div>Summarize how to manage ventilator settings in assist control mode ventilation.</div></li><li class="half_rhythm"><div>Review when assist control indications and the potential advantages of selecting this ventilatory mode.</div></li><li class="half_rhythm"><div>Identify the interprofessional management of the ventilator and the roles of the different members of the interprofessional team in dealing with ventilated patients.</div></li></ul>
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<a href="https://www.statpearls.com/account/trialuserreg/?articleid=17914&utm_source=pubmed&utm_campaign=reviews&utm_content=17914" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Access free multiple choice questions on this topic.</a>
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</p></div><div id="article-17914.s2"><h2 id="_article-17914_s2_">Introduction</h2><p>Mechanical ventilation is a lifesaving procedure that is often performed when patients require respiratory support.<a class="bk_pop" href="#article-17914.r1">[1]</a> Assist-control (AC) mode is one of the most common methods of mechanical ventilation in the intensive care unit<a class="bk_pop" href="#article-17914.r2">[2]</a>.</p><p>AC ventilation is a volume-cycled mode of ventilation. It works by setting a fixed tidal volume (VT) that the ventilator will deliver at set intervals of time or when the patient initiates a breath. The VT delivered by the ventilator in AC always will be the same regardless of compliance, peak, or plateau pressures in the lungs.</p><p>When AC mode is selected in the ventilator, four parameters may be quickly modified:</p><p>
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<b>Tidal Volume (VT)</b>
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</p><p>This is the set amount of volume that will be delivered with each breath. Changing the VT will, in turn, change the minute ventilation (VT x RR); an increase in minute ventilation will result in a decrease in carbon dioxide (CO2), by the same token, a decreased VT will result in a decreased minute ventilation and increase in the patient’s blood CO2.</p><p>
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<b>Respiratory Rate (RR)</b>
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</p><p>This is the set rate for delivering breaths per minute (bpm). For example, if the set rate is 15, then the delivery is 15 bpm or 1 breath every 4 seconds. This is called time-triggered control. In AC, this set rate can be overturned by the patient, meaning that if the patient inhales, the ventilator will sense the drop in pressure and deliver that breath, even if the patient is breathing above the set rate. For example, if a patient is breathing at 20 bpm and the ventilator is set at 15 bpm, the ventilator will follow the patient and deliver 20 bpm (one each time the patient initiates a breath). This is called patient-triggered breaths. The ventilator will only deliver breaths at the set RR if the patient does not trigger it faster. As with VT, increasing RR will increase minute ventilation and decrease the patient’s blood CO2. A caveat on this is that by increasing the RR, the dead space is also increased, so increasing RR may not be as effective as increasing VT in improving ventilation.</p><p>The ventilator in AC mode is programmed to sense changes in the system pressure when a patient initiates a breath. When the diaphragm contracts, the intrathoracic pressure becomes more negative. The negative pressure is transmitted to the airways and then to the ventilator tubing, where sensors detect the change in pressure and deliver a breath to the set tidal volume. The amount of negative pressure needed to trigger a breath is called the trigger sensitivity and is usually set up by the respiratory therapist.</p><p>
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<b>The Fraction of Inspired Oxygen (FiO2)</b>
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</p><p>This is the percentage of oxygen in the air mix delivered by the ventilator during each respiratory cycle. Increasing the FiO2 will increase the patient's oxygen saturation.</p><p>
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<b>Positive End Expiratory Pressure (PEEP)</b>
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</p><p>The positive pressure that will remain in the system at the end of the respiratory cycle (end of expiration) is the PEEP. As with FiO2, PEEP can be used to increase oxygenation. By Henry’s law, we know that the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution. This applies to mechanical ventilation in that increasing PEEP will increase the pressure in the system. This increases the solubility of oxygen and its ability to cross the alveolocapillary membrane and increase the oxygen content in the blood. PEEP also can be used to improve ventilation-perfusion mismatches by opening or “splinting” airways to improve ventilation throughout the system.</p><p>Apart from these four main parameters, the way the ventilation is delivered also can be adjusted. For every setting, regardless of the rate and volume, the breath will always be delivered to the patient in the same way. The ventilator allows flow change; the flow may be constant through the inhalation (square waveform) or decelerating as the breath is delivered (ramp waveform).</p><ol><li class="half_rhythm"><div>Square waveform will allow for faster delivery of the inspiration, decreasing the inspiratory time and increasing the expiratory time. This can be useful for patients with asthma or chronic obstructive pulmonary disease or in cases of increased RR to prevent auto-PEEP and allow for enough time for exhaling.</div></li><li class="half_rhythm"><div>Ramp waveform will decrease the flow as the delivered volume increases. This is usually more comfortable for the patient and allows for a better volume distribution and equalization in patients with heterogeneous lungs, such as ARDS.</div></li></ol><p>The speed at which this flow is delivered also can be controlled by setting inspiratory and expiratory times.<a class="bk_pop" href="#article-17914.r3">[3]</a> This can be adjusted for patient comfort or to prevent auto-PEEP.</p><p>After the inspiration is finished, the expiratory valve of the ventilator opens, and the air is allowed to come out until the pressure in the system reaches PEEP. (figure 1)</p></div><div id="article-17914.s3"><h2 id="_article-17914_s3_">Function</h2><p>AC mode is an excellent method to assure good ventilation. It is frequently used in cases of metabolic or respiratory acidosis. </p><p>AC was the mode used in the landmark study “Ventilation with Lower Tidal Volumes as Compared with Traditional Tidal Volumes for Acute Lung Injury and the Acute Respiratory Distress Syndrome,” from where the ARDSNET protocol came to be<a class="bk_pop" href="#article-17914.r4">[4]</a>. For this reason, it is the only proven mode with survival benefit in patients with acute respiratory distress syndrome (ARDS) and should be the mode of choice to use as it allows for the operator to administer low tidal volumes and adjust PEEP as necessary. </p></div><div id="article-17914.s4"><h2 id="_article-17914_s4_">Issues of Concern</h2><p>An important concept to understand in AC mode is that because the system is volume-cycled and a set volume will always be delivered, the pressure that will be generated in the system will be determined by lung compliance. A very compliant lung will generate low plateau pressures, while a stiff lung does not distend well with the set volume and will generate a much higher pressure (i.e., patients with pulmonary edema, ARDS, pneumonia, or pulmonary fibrosis). It is important to understand this to prevent ventilator-induced lung injury or barotrauma.<a class="bk_pop" href="#article-17914.r5">[5]</a><a class="bk_pop" href="#article-17914.r1">[1]</a> Peak pressure in the system is usually determined by airway resistance and not by compliance, while plateau pressure or the pressure in the system at the end of inspiration is determined by compliance and volume delivered.</p></div><div id="article-17914.s5"><h2 id="_article-17914_s5_">Clinical Significance</h2><p>
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<b>Advantages of AC Mode</b>
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</p><ul><li class="half_rhythm"><div>Increased patient comfort through the ability to trigger breaths as needed</div></li><li class="half_rhythm"><div>Operator-managed patient CO2 levels allow easy corrections for respiratory acidosis/alkalosis.</div></li><li class="half_rhythm"><div>Low work breathing for the patient</div></li></ul><p>
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<b>Disadvantages of AC Mode</b>
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</p><ul><li class="half_rhythm"><div>The system is volume-cycled, and barotrauma is a concern in stiff lungs. Routinely following plateau pressures should help prevent this.</div></li><li class="half_rhythm"><div>If a patient is tachypneic or if not enough time is allowed for exhaling, the patient can develop breath stacking and auto-PEEP. In this process, not all volume is exhaled in every breath, which increases the amount of air in the patient’s lung and the plateau and intrathoracic pressure. This can lead to hypotension due to diminished venous return. Disconnecting the patient from the ventilator to allow enough time for complete exhalation and then readjusting the settings is a solution.</div></li><li class="half_rhythm"><div>Since the patient can initiate breaths, hyperventilation can lead to respiratory alkalosis. This may be solved by assuring good sedation.</div></li></ul></div><div id="article-17914.s6"><h2 id="_article-17914_s6_">Other Issues</h2><p>New ventilator modes are designed to improve some of the shortfalls of AC:<a class="bk_pop" href="#article-17914.r6">[6]</a><a class="bk_pop" href="#article-17914.r1">[1]</a></p><ul><li class="half_rhythm"><div><b>NAVA (neurally adjusted ventilator assist):</b> In this mode, sensors in the diaphragm measure the timing and intensity of the patient’s respiratory effort and couple it with the timing and intensity of the ventilator assist, thereby preventing barotrauma and ensuring ventilator demand fulfillment.<a class="bk_pop" href="#article-17914.r7">[7]</a><a class="bk_pop" href="#article-17914.r8">[8]</a><a class="bk_pop" href="#article-17914.r5">[5]</a></div></li><li class="half_rhythm"><div><b>ASV (Adaptive support ventilation):</b> This mode automatically adapts inspiratory pressure and respiratory rate with minimum work on the part of the patient to assure a target minute ventilation is reached<a class="bk_pop" href="#article-17914.r9">[9]</a>.</div></li><li class="half_rhythm"><div><b>APRV (Airwar pressure release ventilation):</b> This pressure-cycled mode of ventilation delivers a continuous set pressure for a set amount of time and then "releases," giving time for the lung to deflate for a shorter period. In theory, this maintains alveoli inflation to prevent alveolar damage. This mode sometimes is used in patients where AC cannot be effectively and safely continued due to persistently elevated plateau pressures and continuously poor oxygenation<a class="bk_pop" href="#article-17914.r10">[10]</a>.</div></li></ul><p>These and other methods currently are being studied as alternative modes of mechanical ventilation, but none have shown clear superiority over the others.</p></div><div id="article-17914.s7"><h2 id="_article-17914_s7_">Enhancing Healthcare Team Outcomes </h2><p>There are several ways to ventilate a patient, and the pulmonologist or the intensivist makes that decision. No other healthcare professional should make changes to the ventilator settings without first getting approval from the physician in charge. In most hospitals, the respiratory therapist will be in charge of the ventilator and will be the one to make changes in the ventilator settings when required physically. The nurse monitoring the patient should be familiar with the ventilator settings, the alarms, and what they mean. When a ventilator setting is made, it has to be noted in the chart. Coordination by the interprofessional team will improve outcomes. [Level 5]</p></div><div id="article-17914.s8"><h2 id="_article-17914_s8_">Review Questions</h2><ul><li class="half_rhythm"><div>
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</div></li><li class="half_rhythm"><div>
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<a href="https://www.statpearls.com/articlelibrary/commentarticle/17914/?utm_source=pubmed&utm_campaign=comments&utm_content=17914" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Comment on this article.</a>
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</div></li></ul></div><div class="floats-group" id="article-17914.s9"></div><div id="article-17914.s10"><h2 id="_article-17914_s10_">References</h2><dl class="temp-labeled-list"><dt>1.</dt><dd><div class="bk_ref" id="article-17914.r1">Spieth PM, Koch T, Gama de Abreu M. Approaches to ventilation in intensive care. <span><span class="ref-journal">Dtsch Arztebl Int. </span>2014 Oct 17;<span class="ref-vol">111</span>(42):714-20.</span> [<a href="/pmc/articles/PMC4233762/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC4233762</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/25385483" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 25385483</span></a>]</div></dd><dt>2.</dt><dd><div class="bk_ref" id="article-17914.r2">Singer BD, Corbridge TC. Basic invasive mechanical ventilation. <span><span class="ref-journal">South Med J. </span>2009 Dec;<span class="ref-vol">102</span>(12):1238-45.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/20016432" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 20016432</span></a>]</div></dd><dt>3.</dt><dd><div class="bk_ref" id="article-17914.r3">Laghi F. Effect of inspiratory time and flow settings during assist-control ventilation. <span><span class="ref-journal">Curr Opin Crit Care. </span>2003 Feb;<span class="ref-vol">9</span>(1):39-44.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/12548028" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 12548028</span></a>]</div></dd><dt>4.</dt><dd><div class="bk_ref" id="article-17914.r4">Acute Respiratory Distress Syndrome Network. Brower RG, Matthay MA, Morris A, Schoenfeld D, Thompson BT, Wheeler A. Ventilation with lower tidal volumes as compared with traditional tidal volumes for acute lung injury and the acute respiratory distress syndrome. <span><span class="ref-journal">N Engl J Med. </span>2000 May 04;<span class="ref-vol">342</span>(18):1301-8.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/10793162" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 10793162</span></a>]</div></dd><dt>5.</dt><dd><div class="bk_ref" id="article-17914.r5">Saddy F, Sutherasan Y, Rocco PR, Pelosi P. Ventilator-associated lung injury during assisted mechanical ventilation. <span><span class="ref-journal">Semin Respir Crit Care Med. </span>2014 Aug;<span class="ref-vol">35</span>(4):409-17.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/25105820" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 25105820</span></a>]</div></dd><dt>6.</dt><dd><div class="bk_ref" id="article-17914.r6">Al-Hegelan M, MacIntyre NR. Novel modes of mechanical ventilation. <span><span class="ref-journal">Semin Respir Crit Care Med. </span>2013 Aug;<span class="ref-vol">34</span>(4):499-507.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/23934718" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 23934718</span></a>]</div></dd><dt>7.</dt><dd><div class="bk_ref" id="article-17914.r7">Shetty S, Hunt K, Peacock J, Ali K, Greenough A. Crossover study of assist control ventilation and neurally adjusted ventilatory assist. <span><span class="ref-journal">Eur J Pediatr. </span>2017 Apr;<span class="ref-vol">176</span>(4):509-513.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/28180985" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 28180985</span></a>]</div></dd><dt>8.</dt><dd><div class="bk_ref" id="article-17914.r8">Spahija J, de Marchie M, Albert M, Bellemare P, Delisle S, Beck J, Sinderby C. Patient-ventilator interaction during pressure support ventilation and neurally adjusted ventilatory assist. <span><span class="ref-journal">Crit Care Med. </span>2010 Feb;<span class="ref-vol">38</span>(2):518-26.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/20083921" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 20083921</span></a>]</div></dd><dt>9.</dt><dd><div class="bk_ref" id="article-17914.r9">Kirakli C, Naz I, Ediboglu O, Tatar D, Budak A, Tellioglu E. A randomized controlled trial comparing the ventilation duration between adaptive support ventilation and pressure assist/control ventilation in medical patients in the ICU. <span><span class="ref-journal">Chest. </span>2015 Jun;<span class="ref-vol">147</span>(6):1503-1509.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/25742308" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 25742308</span></a>]</div></dd><dt>10.</dt><dd><div class="bk_ref" id="article-17914.r10">González M, Arroliga AC, Frutos-Vivar F, Raymondos K, Esteban A, Putensen C, Apezteguía C, Hurtado J, Desmery P, Tomicic V, Elizalde J, Abroug F, Arabi Y, Moreno R, Anzueto A, Ferguson ND. Airway pressure release ventilation versus assist-control ventilation: a comparative propensity score and international cohort study. <span><span class="ref-journal">Intensive Care Med. </span>2010 May;<span class="ref-vol">36</span>(5):817-27.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/20229042" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 20229042</span></a>]</div></dd></dl></div><div><dl class="temp-labeled-list small"><dt></dt><dd><div><p class="no_top_margin">
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<b>Disclosure: </b>Andres Mora Carpio declares no relevant financial relationships with ineligible companies.</p></div></dd><dt></dt><dd><div><p class="no_top_margin">
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<b>Disclosure: </b>Jorge Mora declares no relevant financial relationships with ineligible companies.</p></div></dd></dl></div><div class="bk_prnt_sctn"><h2>Figures</h2><div class="whole_rhythm bk_prnt_obj bk_first_prnt_obj"><div id="article-17914.image.f1" class="figure bk_fig"><div class="graphic"><img src="/books/NBK441856/bin/AC__vent.jpg" alt="Image AC__vent" /></div><div class="caption"><p>Assist Control Ventilation Contributed by A Mora, MD</p></div></div></div></div></div></div>
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