The sedation of critically ill adults: part 2: management

The prevention and treatment of pain, anxiety, and delirium in the ICU are important goals. But achieving a balance between sedation and analgesia, especially in critically ill patients on mechanical ventilation, can be challenging. Both under- and oversedation carry grave risks. Without having an agreed-upon end point for sedation, different providers will likely have disparate treatment goals, increasing the risk of iatrogenic complications and possibly impeding recovery. In 2002 the Society of Critical Care Medicine, along with the American Society of Health-System Pharmacists, updated recommendations in its clinical practice guidelines for the sustained use of sedatives and analgesics in adults. This two-part series examines those recommendations concerning sedation assessment and management, as well as the current literature. Last month, Part 1 reviewed pertinent recommendations concerning pain and delirium and discussed tools for assessing pain, delirium, and sedation. This month, Part 2 explores pharmacologic and nonpharmacologic management of anxiety and agitation in the ICU.The second in a two-part series focuses on the pharmacologic and nonpharmacologic management of anxiety and agitation in the ICU.     

Optimal sedation in pediatric intensive care patients: a systematic review

Purpose

Sedatives administered to critically ill children should be titrated to effect, because both under- and oversedation may have negative effects. We conducted a systematic review to examine reported incidences of under-, optimal, and oversedation in critically ill children receiving intensive care.

Methods

A systematic literature search using predefined criteria was performed in PubMed and Embase to identify all articles evaluating level of sedation in PICU patients receiving continuous sedation. Two authors independently recorded: study objective, study design, sample size, age range, details of study intervention (if applicable), sedatives used, length of sedation, sedation scale used, and incidences of optimal, under-, and oversedation as defined in the studies.

Results

Twenty-five studies were included. Two studies evaluated sedation level as primary study outcome; the other 23 as secondary outcomes. Together, these studies investigated 1,163 children; age range, 0–18 years. Across studies, children received many different sedative agents and sedation level was assessed with 12 different sedation scales. Optimal sedation was ascertained in 57.6 % of the observations, under sedation in 10.6 %, and oversedation in 31.8 %.

Conclusions

This study suggests that sedation in the PICU is often suboptimal and seldom systematically evaluated. Oversedation is more common than undersedation. As oversedation may lead to longer hospitalization, tolerance, and withdrawal, preventing oversedation in pediatric intensive care deserves greater attention.     

Monitoring sedation, agitation, analgesia, and delirium in critically ill adult patients.

The recent development of valid and reliable assessment tools to monitor agitation, sedation, analgesia, and delirium in the ICU represents an essential first step in the provision of patient comfort and the development of preferred treatment strategies. To make the ICU a more humane healing environment, these assessment tools must be used as part of a comprehensive evaluation of interventional and preventive treatments, pharmacologic and nonpharmacologic. In the spirit of the JCAHO, it may be time to add the evaluation of sedation, agitation, and delirium to that of pain assessment, making all aspects of patient comfort the fifth vital sign for the critically ill.     

Issues regarding the use of analgesia and sedation in critically ill neonates.

Attitudes and beliefs of physicians and nurses have shifted during the past decade, resulting in more frequent administration of analgesics and sedatives to neonates. However, nurses caring for critically ill newborns have difficulty in determining appropriate interventions because of the lack of clear and complete knowledge related to the use of analgesia and sedation in this patient population. This chapter presents current information on six key issues related to the use of analgesia and sedation in neonates. An algorithm for determining appropriate intervention for neonates with pain, distress, or agitation is proposed to provide a more systematic approach to the use of analgesics and sedatives.     

Analgesic and sedative pharmacology in the intensive care unit

Sedation and analgesia are central elements in the care of critically ill, mechanically-ventilated patients. The goal of analgesic therapy is to provide relief from pain and physical discomfort which may lead to poor sleep, agitation, or a stress response. Opioids, such as morphine, fentanyl, and hydromorphone, are considered first-line agents for treating pain. All of these agents are equally effective at equipotent doses and the choice of an agent depends on both drug and patient characteristics. Sedatives with amnestic properties are desirable to prevent or relieve anxiety and agitation. The benzodiazepines and propofol are the primary sedative agents used in the intensive care unit (ICU). Agents such as clonidine and haloperidol may have a role in the ICU when used concomitantly with sedatives and analgesics. An understanding of the pharmacotherapy of sedation and analgesia in the ICU will help support appropriate usage of these agents and improve patient care.     

Delirium en réanimation chez l’adulte: le choix des molécules a-t-il un rôle ?

Characteristics of sedation and analgesia have moved from deep toward lightened and cooperative sedation and analgesia with control of delirium. Although sedative drugs potently modulate neurotransmission in the central nervous system (CNS) to provide their sedative effects, a body of recent work suggests that some of these properties may contribute to delirium and in turn to the long-term impairment of cognitive recovery after intensive care unit (ICU) stay. Delirium has been shown to predict both long-term mortality and severe cognitive sequelae after ICU stay. Classical sedatives (propofol, benzodiazepines) and analgesics are causative factors for delirium. Recently, dexmedetomidine, a potent, and short acting agonist of the alpha2-adrenergic receptors, has been developed as a primary sedative for ICU mechanically ventilated patients. This agent exerts its effects via a unique mechanism (agonist of the alpha2-adrenoceptors) which confers some favorable properties with respect to the goals to be achieved in a sedated, mechanically ventilated patient (cooperative sedation). This agent has been shown to reduce the prevalence of delirium and days with coma in comparison with a benzodiazepine-based sedation regimen. Its sedation profile preserves arousability and its mechanism of action preserves non rapid eye movement sleep, which may contribute to its delirium-sparing effects as well. The need for CNS acting drugs, such as sedatives and analgesics, has to be carefully evaluated on a daily basis at the bedside to limit the potential detrimental effects associated with oversedation in critically ills.     

Anxiety, delirium, and pain in the intensive care unit.

Anxiety, agitation, delirium, and pain are common findings in the ICU. These unhealthy states may lead to increased irritability, discomfort, hypertension, tachycardia, cardiac ischemia, harmful motor activity, and psychologic disquiet for the patient. The appropriate treatment of these conditions may lead to decreased morbidity and mortality in the critically ill patient. Unfortunately, the management of anxiety, agitation, delirium, and pain in the intensive care unit is not ideal. Many patients interviewed after an ICU stay rate their pain control as poor and their memories of their stay as unpleasant. Furthermore, many caregivers lack sufficient understanding of the appropriate or indicated uses of drugs to allay patients' fears and pain. The use of suitable protocols for the proper titration of sedation of mechanically ventilated patients and monitoring of the level of sedation in ventilated patients may decrease the amount of time that patients are ventilated and may alleviate some of the emotional stresses of recall of painful procedures or uncomfortable mechanical ventilation. Future research into protocols for the care of the critically ill patient can enhance the overall well-being of these patients.     

Sedation and paralysis during mechanical ventilation

Treatment of anxiety and delirium, provision of adequate analgesia, and, when necessary, amnesia in critically ill patients is humane and may reduce the incidence of post-traumatic stress disorders. Injudicious use of sedatives and paralytics to produce a passive and motionless patient, however, may prolong weaning and length of stay in the intensive care unit. This report reviews indications and choices for pharmacologic treatment of anxiety, delirium, agitation, and provision of anesthesia in critically ill patients. The choice of pharmacologic agents is made difficult by complex or poorly understood pharmacokinetics, drug actions, and adverse effects in critically ill patients. Advantages, adverse effects, and limitations of drug treatment, including use of neuromuscular blocking drugs and use of sedatives and analgesia during the withdrawal of life-sustaining measures are reviewed.     

Metabolic and endocrine effects of sedative agents

PURPOSE OF REVIEW: To bring to the attention of the clinician the metabolic effects of most common sedatives and analgesics used in critically ill patients. RECENT FINDINGS: Most patients admitted to the intensive care unit require sedation and analgesia to reduce anxiety, agitation, and delirium and provide pain relief. Inappropriate sedation and analgesia techniques can cause harm to the already compromised patient if they do not take into account the metabolic effect they produce. SUMMARY: Metabolically critical illness can be divided in two phases, and acute and a prolonged one. Whereas the acute or hypermetabolic phase is characterized by elevated circulating concentration of catabolic hormones and substrate utilization to provide energy to vital organs, the prolonged or catabolic phase of critical illness is marked by reduced endocrine stimulation and severe loss of body cell mass. The most common analgesic and sedative agents used in the intensive care unit, if used in small or moderate doses, do not interfere significantly with the metabolic milieu; however, prolonged infusions, and in high doses, without adequate monitoring of level of sedation and quality of analgesia, can precipitate morbid events. Further research is needed in the metabolic aspects of analgesia and sedation in the intensive care unit, particularly if a multimodal pharmacologic strategy is used whereby multiple interventions aim at minimizing the risk of overdosing and contributing to attenuation of the stress response associated with critical illness.     

Tolerance and withdrawal issues with sedation

The stay in an ICU is a complex mixture of providing optimal care while keeping the patient safe. Means of reducing the anxiety associated with the ICU stay include frequent reorientation and maintenance of patient comfort with sedation supplemented by analgesia as needed. The most common agents used to provide sedation include benzodiazepines, propofol, and the newer dexmedetomidine. Others include barbiturate agents, neuroleptics, clonidine, etomidate, ketamine, and supplemental opioid analgesics for pain control. A common complication of sedation is tolerance, which can lead to withdrawal if the sedation is discontinued hastily. This article evaluates the occurrence of tolerance and withdrawal in the most commonly used sedatives in critically ill patients.     

重症监护病房患者镇痛镇静的研究进展

镇痛镇静治疗已经成为重症监护病房中综合治疗的重要组成部分,可以消除或减轻患者的疼痛及不适,控制焦虑、躁动和谵妄,减轻应激反应,改善患者睡眠、诱导遗忘,提高机械通气的协调性,减轻医疗护理操作对患者造成的伤害性刺激,使危重患者处于舒适和安全的理想水平。本文对重症监护病房患者镇痛镇静的研究进展进行综述。     

镇痛镇静药物在持续性肾脏替代治疗中的药代动力学

重症疾病和持续性肾脏替代治疗（CRRT）都是影响镇痛镇静药物药代动力学的因素。重症疾病会影响药物吸收、组织穿透力、药物代谢、药物清除等药代动力学因素;CRRT对药代动力学的影响也体现在诸多方面,最主要的影响是药物清除。本文总结了重症患者常用镇痛镇静药物在CRRT治疗中的药代动力学及剂量调整建议。     

Sedation of the mechanically ventilated patient

Goals in the care of the mechanically ventilated patient are sedation, analgesia, anxiolysis, and muscle relaxation. Causes of distress in these patients include: pain, sleep deprivation, anxiety, psychosis, agitation, and delirium. Drugs used to alleviate these stressors are opiates, benzodiazepines, neuromuscular blocking agents, anesthetic induction agents, and inhalational agents. When caring for the agitated patient on the mechanical ventilator, physiologic, mechanical, and emotional causes must all be investigated. Finally, nonpharmacologic therapy is of utmost importance in the care of these patients.     

Liberation and animation for ventilated ICU patients: the ABCDE bundle for the back-end of critical care

Critically ill patients are frequently prescribed sedatives and analgesics to ensure patient safety, to relieve pain and anxiety, to reduce stress and oxygen consumption, and to prevent patient ventilator dysynchrony. Recent studies have revealed that these medications themselves contribute to worsening clinical outcomes. An evidence-based organizational approach referred to as the ABCDE bundle (Awakening and Breathing Coordination of daily sedation and ventilator removal trials; Choice of sedative or analgesic exposure; Delirium monitoring and management; and Early mobility and Exercise) is presented in this commentary.     

Clinical recommendations for pain,sedation, withdrawal and delirium assessment in critically ill infants and children: an ESPNIC position statement for healthcare professionals

Background

This position statement provides clinical recommendations for the assessment of pain, level of sedation, iatrogenic withdrawal syndrome and delirium in critically ill infants and children. Admission to a neonatal or paediatric intensive care unit (NICU, PICU) exposes a child to a series of painful and stressful events. Accurate assessment of the presence of pain and non-pain-related distress (adequacy of sedation, iatrogenic withdrawal syndrome and delirium) is essential to good clinical management and to monitoring the effectiveness of interventions to relieve or prevent pain and distress in the individual patient.

Methods

A multidisciplinary group of experts was recruited from the members of the European Society of Paediatric and Neonatal Intensive Care (ESPNIC). The group formulated clinical questions regarding assessment of pain and non-pain-related distress in critically ill and nonverbal children, and searched the PubMed/Medline, CINAHL and Embase databases for studies describing the psychometric properties of assessment instruments. Furthermore, level of evidence of selected studies was assigned and recommendations were formulated, and grade or recommendations were added on the basis of the level of evidence.

Results

An ESPNIC position statement was drafted which provides clinical recommendations on assessment of pain (n = 5), distress and/or level of sedation (n = 4), iatrogenic withdrawal syndrome (n = 3) and delirium (n = 3). These recommendations were based on the available evidence and consensus amongst the experts and other members of ESPNIC.

Conclusions

This multidisciplinary ESPNIC position statement guides professionals in the assessment and reassessment of the effectiveness of treatment interventions for pain, distress, inadequate sedation, withdrawal syndrome and delirium.

     

Sedative and analgesic medications: risk factors for delirium and sleep disturbances in the critically ill

Sedatives and analgesics are routinely used in critically ill patients, although they have the potential for side effects, such as delirium and sleep architecture disruption. Although it should be emphasized that these medications are extremely important in providing patient comfort, health care professionals must also strive to achieve the right balance of sedative and analgesic administration through greater focus on reducing unnecessary or overzealous use. Ongoing clinical trials should help us to understand whether altering the delivery strategy, via daily sedation interruption, or protocolized target-based sedation or changing sedation paradigms to target different central nervous system receptors can affect cognitive outcomes and sleep preservation in our critically ill patients.     

Early sedation use in critically ill mechanically ventilated patients: when less is really more

Over the last 10 years, there has been an explosion of literature surrounding sedation management for critically ill patients. The clinical target has moved away from an unconscious and immobile patient toward a goal of light or no sedation and early mobility. The move away from terms such as ‘sedation’ toward more patient-centered and symptom-based control of pain, anxiety, and agitation makes the management of critically ill patients more individualized and dynamic. Over-sedation has been associated with negative ICU outcomes, including longer durations of mechanical ventilation and lengths of stay, but few studies have been able to associate deep sedation with increased mortality.     

Part 2. Chemical and physical restraints in the management of mechanically ventilated patients in the ICU: A patient perspective

An important goal of the care for the mechanically ventilated patient is to minimize patient discomfort and anxiety. This is partly achieved by frequent use of chemical and physical restraints. The majority of patients in intensive care will receive some form of sedation. The goal and use of sedation has changed considerably over the past few decades with literature evidencing trends toward overall lighter sedation levels and daily interruption of sedation. Conversely, the use of physical restraint for the ventilated patient in ICU differs considerably between nations and continents. A large portion of the literature on the use of physical restraint is from general hospital wards and residential homes, and not from the ICU environment. Recent literature suggests minimal use of physical restraint in the ICU, and that reduction programmes have been initiated. However, very few papers illuminate the patient's experience of physical and chemical restraints as a treatment strategy. In Part 1 of this two-part review, the evidence on chemical and physical restraints was explored with specific focus on definitions of terms, unplanned extubation, agitation, delirium as well as the impact of nurse-patient ratios in the ICU on these issues. This paper, Part 2, examines the evidence related to chemical and physical restraints from the mechanically ventilated patient's perspective.     

Consensus guidelines on sedation and analgesia in critically ill children

Objective The United Kingdom Paediatric Intensive Care Society Sedation, Analgesia and Neuromuscular Blockade Working Group is a multi-disciplinary expert panel created to produce consensus guidelines on sedation and analgesia in critically ill children and forward knowledge in these areas. Sedation and analgesia are recognised as important areas of critical care practice and adult clinical practice guidelines in these fields remain amongst the most popular of those produced by the Society of Critical Care Medicine. However, similar clinical practice guidelines have not previously been produced for the critically ill paediatric patient.Design A modified Delphi technique was used to allow the Working Group to anonymously consider draft recommendations in three Delphi rounds with predetermined levels of agreement. This process was supported by a total of four consensus conferences. Once consensus had been reached, a systematic review of the available literature was carried out.Outcome A set of consensus guidelines was produced including 20 key recommendations, 10 relating to the provision of analgesia and 10 relating to the sedation of critically ill children. An evaluation of the existing literature supporting these recommendations is provided.Conclusions Multi-disciplinary consensus guidelines for maintenance sedation and analgesia in critically ill children have been successfully produced and are supported by levels of evidence (excluding sedation and analgesia for procedures and excluding neonates). The working group has highlighted the paucity of high-quality evidence in these important clinical areas and this emphasises the need for further randomised clinical trials in this area.This article is discussed in the editorial available at: Financial support received: none.Conflict of interest: none.     

Development of the American association of critical-care nurses' sedation assessment scale for critically ill patients.

Clinicians commonly sedate critically ill patients. Sedatives should be administered to achieve predetermined end points. Most currently available scales used to assess sedation are inadequate because they focus on a single domain, such as consciousness. The development of the American Association of Critical-Care Nurses' Sedation Assessment Scale is described. This new scale consists of 5 domains: consciousness, agitation, anxiety, sleep, and patient-ventilator synchrony. A major advantage of the scale is that its domains parallel common goals of sedation therapy for critically ill patients. The proposed measurements for each domain are based on a comprehensive evaluation of the science and expert recommendations. Before the scale is widely used, clinical testing is required to determine its validity and reliability in a variety of critically ill patients and care situations.