Agitation Postoperative
Postoperative agitation is an abnormal mental state that develops after surgery, affecting up to half of older adults and occurring when patients wake from anesthesia feeling confused, restless, or unusually aggressive.
Table of contents
- What Is Postoperative Agitation?
- Types and Timing
- How Common Is It?
- Signs and Symptoms
- Risk Factors
- What Causes Postoperative Agitation?
- How Is It Diagnosed?
- Impact and Consequences
- Prevention Strategies
- Treatment and Management
- Supporting Someone with Postoperative Agitation
What Is Postoperative Agitation?
Postoperative agitation refers to abnormal mental states that can develop after someone has surgery and receives anesthesia. These conditions go by several names, including emergence delirium, emergence agitation, and postoperative delirium. While it’s normal for patients to feel a bit sleepy or out of sorts immediately after surgery, postoperative agitation involves more significant changes in mental function.[3]
This condition can happen when someone is waking up from anesthesia or in the days and weeks following surgery. The term encompasses different patterns of abnormal recovery. Some patients become restless, agitated, and hyperactive, while others experience the opposite—becoming very drowsy and slow to respond.[1]
When agitation occurs specifically during the transition from unconsciousness to wakefulness right after anesthesia, it’s most commonly called emergence agitation or emergence delirium. When confusion and altered thinking develop in the hours to days after surgery, it’s typically referred to as postoperative delirium.[1]
Types and Timing
Postoperative agitation can appear at different times after surgery. Emergence agitation typically occurs from as early as 10 minutes after anesthesia up to the time the patient leaves the recovery room.[7] This immediate form happens as the patient transitions from being unconscious to fully awake.
Postoperative delirium, on the other hand, can develop anywhere from hours to up to seven days after surgery, or until the patient leaves the hospital.[7] In some cases, symptoms can appear within hours to weeks after the operation.[3]
The behavior itself can also vary. Doctors identify three main types based on how the person acts. Hyperactive delirium involves restlessness, agitation, and increased activity. Hypoactive delirium is characterized by lethargy, reduced alertness, and decreased responsiveness. Some patients experience a mixed type that alternates between both patterns.[4][6]
How Common Is It?
Postoperative agitation is surprisingly common. The rates vary depending on who is being studied and how the condition is measured. Overall, the estimated occurrence ranges from 4% to 31% of all surgical patients, though some studies report rates as low as 0.25% and as high as 90.5%.[1][5]
The condition is especially common in certain age groups. In children, emergence delirium affects an average of 18% to 30%, though estimates have ranged from as low as 2% to as high as 80% in some studies. Some sources indicate the rate in children can be as high as 50% to 80%.[1]
For older adults, postoperative delirium is the most common complication following surgery. It affects up to 50% of seniors having operations, according to the American Geriatrics Society.[3] Among elderly patients undergoing procedures like vascular surgery, the rate can reach 36%.[6]
In adults undergoing nasal surgery specifically, one study found an overall incidence of emergence agitation of 22.2%.[2]
Signs and Symptoms
The symptoms of postoperative agitation can be distressing for both patients and their loved ones. The condition is marked by impaired awareness, abnormal cognitive function, and confusion. People experiencing postoperative agitation may show verbal and physical agitation, though some show the opposite—becoming very quiet and inactive.[1]
Common physical signs include restlessness, disorientation, excitation, non-purposeful movements, thrashing, and fidgeting.[5] Patients might toss and turn in bed, pull at their clothes or bedsheets, or try to remove medical devices like IV lines or catheters.[3][4]
Mental and emotional symptoms can include confusion, disorientation, difficulty focusing, hallucinations, paranoia, and anxiety or fear. Some people show rapid mood swings or become unusually aggressive or combative. Others may demonstrate irritability, depression, or personality changes that seem out of character.[3][4]
Speech may be affected, with patients mumbling, using slurred speech, or making moaning sounds. Some people shout or use strong language they wouldn’t typically use.[3][4]
In the hypoactive form, symptoms look quite different. Patients may appear very sleepy, show reduced arousal, have difficulty staying alert, or seem lethargic and sluggish.[3][4]
The key feature distinguishing postoperative agitation from normal emotions is that these behaviors fluctuate—they come and go—and represent a sudden change from the person’s usual mental state.[5]
Risk Factors
Several factors can increase the likelihood of developing postoperative agitation. These can be grouped into patient-related factors and surgery-related factors.
Patient-related risk factors include extremes of age—both very young children and older adults are at higher risk. Being male also increases risk. People with preexisting mental health conditions such as depression, anxiety, or post-traumatic stress disorder are more vulnerable. In older adults, having dementia before surgery is the strongest predictor for developing postoperative delirium.[1][6]
Additional patient factors include preoperative anxiety, functional impairment, greater overall health problems, vision or hearing impairment, and a previous history of postoperative delirium. In children, poor adaptability and sociability can predispose them to emergence delirium. Recent smoking is also a risk factor for adults.[1][2][3]
Surgery-related risk factors involve the type of anesthesia used, with volatile anesthetics—particularly shorter-acting ones like sevoflurane—associated with higher rates of emergence agitation. The type of surgery matters too. In children, ear, nose, throat, and eye surgeries carry higher risk. In adults, abdominal and breast surgeries are associated with increased rates.[1][2]
Higher levels of pain after surgery, longer duration of the operation, longer preoperative fasting times (especially in children), emergency operations, and the presence of invasive devices like breathing tubes or urinary catheters all increase the likelihood of postoperative agitation.[1][2][5]
One study found that having a breathing tube in place after surgery increased the risk of emergence agitation approximately fivefold, making it the greatest single risk factor. Younger age was also a strong predictor, with risk increasing as age decreased.[2]
What Causes Postoperative Agitation?
The exact mechanisms behind postoperative agitation are not fully understood. Scientists believe it involves an imbalance between excitatory and inhibitory pathways in the brain, and different effects of hypnotic agents (drugs that cause unconsciousness) on different parts of the brain.[1]
During the dying of brain cells or disruption of normal brain function, several physiological changes can trigger agitation. When organs like the kidneys and liver begin to fail after major surgery, waste products can build up in the body, leading to chemical imbalances. This affects how the brain functions and can cause confusion and disorientation.[3]
When the heart or lungs don’t work properly after surgery, less oxygen reaches the brain. This oxygen deprivation can result in altered mental states and agitation.[3]
Specific triggers that can cause or worsen postoperative agitation include uncontrolled pain, certain medications (especially opioid pain relievers, but also drugs used for anxiety, depression, insomnia, or Parkinson’s disease), infection or fever, constipation or urinary retention, and adverse reactions to medications.[3][4][7]
The stress of being in an unfamiliar hospital environment, away from familiar surroundings and routines, can also contribute to agitation, especially in people with cognitive impairment who may become frustrated with their limitations.[3]
How Is It Diagnosed?
Diagnosing postoperative agitation involves recognizing specific patterns of symptoms and timing. According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), delirium includes a disturbance in attention, cognition, or awareness that develops over a short period and has a fluctuating course. The changes must differ from the patient’s usual mental function.[7]
Healthcare providers use several assessment tools to identify and measure postoperative agitation. For children, the Pediatric Anesthesia Emergence Delirium (PAED) scale is commonly used. For adults, providers often use the Richmond Agitation-Sedation Scale (RASS), which identifies patients as having emergence agitation if they score +1 or higher at any time in the recovery room. The Confusion Assessment Method for the Intensive Care Unit (CAM-ICU) is another validated tool.[1][2]
The main difference between emergence agitation and postoperative delirium is based on timing—when the symptoms appear in relation to the anesthesia. Emergence agitation happens during the immediate waking period, while postoperative delirium develops later.[1]
It’s important for doctors to distinguish postoperative delirium from dementia. While some symptoms are similar, delirium is typically reversible and comes on suddenly, whereas dementia develops gradually and involves permanent changes. Delirium can be prevented in approximately 40% of cases, making early recognition crucial.[3]
Impact and Consequences
While postoperative agitation is often short-lived and resolves on its own, it can have serious consequences. The impact is evident in multiple areas, affecting patients, caregivers, and the healthcare system.[1][5]
For patients, agitation can lead to physical injury—either self-inflicted or to medical staff. Patients may fall out of bed, experience bleeding at the surgical site, or accidentally remove drains or IV lines. There’s risk of unintended removal of breathing tubes and respiratory depression.[5]
If not identified early and treated properly, postoperative delirium can cause long-term problems. These include cognitive decline, functional decline (loss of ability to perform daily activities), longer hospital stays, and increased likelihood of being transferred to long-term care facilities rather than going home. Patients face higher mortality rates and greater healthcare costs.[3][6]
The psychological distress experienced by both patients and their families is significant. Family members report emotional distress when witnessing agitation in their loved ones. Patient satisfaction decreases, and recovery time is prolonged.[1]
Most cases of delirium last a week or less, with symptoms gradually declining as the patient recovers. However, the condition can persist for weeks or months in patients with underlying cognitive challenges, dementia, or sensory impairments. Most people with delirium after surgery recover within one to six months, though some may experience lasting problems with thinking and memory.[3][4]
Prevention Strategies
An essential component of managing postoperative agitation is prevention. Research shows that up to 40% of delirium cases can be prevented through proactive measures.[1][3]
Nonpharmacologic interventions are the first line of prevention. These include having patients walk multiple times daily, providing frequent orientation to location and time, allowing uninterrupted nighttime sleep, ensuring adequate hydration, preventing infection, and avoiding physical restraints and bladder catheters when possible. Making sure patients have their glasses and hearing aids helps them stay connected to their environment.[3]
Programs like parent-present induction for children and preoperative education about surgery can help reduce anxiety and subsequent agitation.[1]
Anesthesia selection plays a role in prevention. Using total intravenous anesthesia (giving anesthesia through an IV rather than through inhaled gases) and propofol has been shown to reduce emergence agitation compared to volatile anesthetics.[1]
Pain management is crucial. Providing optimal pain control after surgery with non-opioid pain medications when possible is linked to decreased delirium. Multimodal analgesia (using multiple methods to control pain) and regional analgesia (numbing specific areas) are effective strategies. However, it’s a balancing act—both undertreating and overtreating pain with opioids can lead to delirium.[1][4]
Medication strategies include using premedication and giving certain drugs during surgery. Medications that have shown benefit include dexmedetomidine, clonidine, fentanyl, midazolam, and dexamethasone. Combinations of medications are generally more successful than using a single drug.[1]
Healthcare providers should avoid or carefully manage medications that can cause delirium, including certain drugs used for anxiety, depression, insomnia, Parkinson’s disease, and overactive bladder.[3]
Treatment and Management
When postoperative agitation does occur, treatment focuses on controlling pain and agitation through both supportive measures and medications, with the goal of avoiding complications.[1]
The first step is identifying and treating the underlying cause. Healthcare providers look for treatable problems like uncontrolled pain, infection, constipation, urinary retention, medication side effects, or organ failure. Simple interventions to address these issues can often resolve the agitation.[7]
Creating a calm, supportive environment is important. This includes dimming lights, reducing noise, removing distractions, and using gentle, reassuring words. Soft music or comforting scents like lavender may help. Family members can provide familiar faces and soothing voices, which can be very calming.[4]
For physical comfort, healthcare providers reposition patients gently, use pillows for support, and check temperature by touching hands and feet. If a patient is trying to get up or remove medical devices, staff redirect their movements with calm hands and words rather than using physical restraints, which can increase anxiety.[4]
When behavioral interventions aren’t enough, medication may be necessary. Benzodiazepines (such as lorazepam or alprazolam) are considered the main treatment for anxiety and agitation. The choice depends on how quickly the medication needs to work, how long it should last, and what forms are available.[1]
Antipsychotic medications (also called neuroleptics) such as haloperidol, chlorpromazine, olanzapine, quetiapine, or risperidone are used when agitation is severe, especially if hallucinations or paranoia are present. However, these should be used with caution and only when necessary, as they can prolong delirium rather than cure it.[4]
Medication reconciliation—reviewing all medications to identify and stop unnecessary ones—is an important part of treatment, as medication miscommunication is a common reason for worsening mental status.[4]
Supporting Someone with Postoperative Agitation
If you’re caring for someone with postoperative agitation, there are many ways you can help. First and most importantly, don’t wait if you notice symptoms. Contact the healthcare team immediately rather than waiting for a scheduled appointment. You can call the doctor, send a message through a patient portal, or schedule a telemedicine visit where simple tests can be done over video or phone.[4]
During any contact with healthcare providers, have a list of all medications available. Be prepared to discuss pain levels, as both over-medication and under-medication can contribute to agitation.[4]
Your presence can make a significant difference. During recovery, familiar faces and soothing voices help calm patients. Studies show that family support—including help with feeding and ensuring sleep safety—can even prevent delirium from occurring.[3]
Make sure your loved one has their assistive devices—reading glasses and hearing aids help them communicate and stay grounded in their environment. Speak softly using familiar, reassuring phrases like “I’m right here,” “You’re safe,” and “I love you.” Even if they seem unaware, your voice can still bring comfort.[3][4]
Let your loved one guide the pace. They may want stillness, or they might have things they want to share. Just be there in the way they need you most.[4]
Taking care of yourself is equally important. Witnessing agitation in someone you love is stressful and heartbreaking. Consider joining a support group, leaning on friends and family for help with tasks, taking regular breaks, and talking to a counselor or spiritual professional to process your emotions.[4]
Remember that your loved one’s agitation isn’t a reflection of their feelings toward you or the care you’re providing. It’s a medical symptom that can be managed with professional help.
