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REVIEW ARTICLE
Year : 2014  |  Volume : 9  |  Issue : 1  |  Page : 1-6
 

Procedural sedation and analgesia in pediatric patients


1 Department of Anesthesiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
2 Department of Anesthesiology, Fortis Memorial Research Institute, Gurgaon, Haryana, India

Date of Web Publication25-Apr-2014

Correspondence Address:
Charu Mahajan
Department of Anesthesiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1817-1745.131469

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   Abstract 

A spectrum of conditions requires sedation and analgesia in pediatric population. Ineffective treatment of pain may result in physiological and behavioral responses that can adversely affect the developing nociceptive system. The recognition of pain in children can be facilitated by different pain scales. This article reviews the procedural sedation and analgesia (PSA) practices in children along with pharmacology of the drugs used for this purpose.


Keywords: Analgesia, children, procedural sedation


How to cite this article:
Mahajan C, Dash HH. Procedural sedation and analgesia in pediatric patients. J Pediatr Neurosci 2014;9:1-6

How to cite this URL:
Mahajan C, Dash HH. Procedural sedation and analgesia in pediatric patients. J Pediatr Neurosci [serial online] 2014 [cited 2019 Apr 19];9:1-6. Available from: http://www.pediatricneurosciences.com/text.asp?2014/9/1/1/131469



   Introduction Top


With the better understanding of the developmental neurobiology, it is now a well recognized fact that nervous system is sufficiently sensitive to nociception even before birth, and thus, children should not be undertreated for pain. This aspect has received considerable attention since the landmark studies of Anand and colleagues. [1],[2] They were of the opinion that infants and even preterm babies have the anatomical and functional ability to perceive pain. Infants show greater hemodynamic, immune, hormonal, and metabolic stress responses, which may result in impaired healing of damaged or infected tissue leading to increased morbidity.

The descending inhibitory pathways to the dorsal horn of the spinal cord are not developed at birth, which may lead to accentuation of pain in neonates. Moreover, the dorsal horns have wider receptive fields and lower excitatory thresholds than those in older children. [3],[4]

Procedural sedation technique should ideally be individualized as per the requirement. For a child undergoing a procedure, a major deciding factor is whether it is painful or not [Table 1]. Pure sedation is sufficient for the imaging studies, while analgesia is required for all invasive procedures, which inflict pain to the child. Sedation is required during the procedures to allay the anxiety, pain, and movement. Coaxing and physical restraint is not an alternative and this may make the procedure not only difficult but also unsafe for the child. Moreover, the psychological trauma may be severe enough to even lead to stress disorder. [5] If pain is not recognized and adequately treated, the resulting physiological and behavioral responses can lead to long-lasting negative effects on the developing nociception system. [6],[7]
Table 1: Procedures requiring sedation

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Objective and quantitative measurement of pain in children is a herculean task for most anesthesiologists. Observational pain scales have been validated for neonates and infants to allow pain assessment in those unable to verbalize their pain [Table 2]. [8],[9],[10],[11]
Table 2: Pain scales

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Pre-sedation assessment for procedure

Children undergoing sedation should be evaluated beforehand according to the preoperative assessment guidelines of the American Society of Anesthesiologists (ASA). Laboratory workup has no role prior to procedural sedation. Informed consent should be obtained and documented prior to the procedure. ASA fasting guidelines for procedural sedation and analgesia (PSA) may not be followed in every case; the risk in individual patients must be weighed against the risk of delaying an emergent procedure. [11]

Equipment and emergency drugs

It is necessary to have appropriate equipment, monitoring, and reliable back up help before instituting sedation for a procedure in a child. Age and body weight of the child has to be recorded so that appropriate airway and resuscitation equipment be made available. Emergency medications namely atropine, epinephrine, hydrocortisone, flumazenil, naloxone etc., should be available.

Monitoring

Standard non-invasive monitoring should be used in all patients, which includes ECG, BP, pulse oximetry, respiratory rate, and capnography. Sadhasivam et al. [12] concluded that the BIS monitor is a quantitative, non-disruptive, and easy to use depth of sedation monitor in children more than one year.

Special considerations for infants and children

Most analgesics (including opioids and local anesthetics) are conjugated in the liver. Hepatic enzyme systems are not mature in newborns and premature infants. Glomerular filtration rates are diminished in neonates and reach adult levels by one year of age. Newborns have a higher percentage of body weight as water and less fat as compared with older patients. Water-soluble drugs, therefore, often have larger volumes of distribution. Neonates have reduced plasma concentrations of both albumin and alpha-1 acid glycoprotein than older children and adults. This may result in higher concentration of active drug leading to greater drug effect or drug toxicity. [13] Application of eutectic mixture of local anesthetics (EMLA) before venous cannulation can be helpful in reducing pain.

Pharmacology of the drugs

The guiding principle for analgesic administration is the step ladder approach to pain. This is a three-step approach for selecting drugs according to their analgesic potency based on the child's pain level. The non-steroidal anti-inflammatory drugs (NSAIDS) are used for mild to moderate pain by themselves or in combination with other agents for moderate to severe pain. However, opioids are used for moderate to severe pain.

NSAIDS, though used extensively in older children and adults, are not preferred in neonates because of their increased risk of side-effects. Commonly used drugs are acetaminophen and ketorolac. These drugs have to be used along with sedative agents for procedures.

Acetaminophen is the most commonly used NSAID, particularly for mild pain. However, it has limited efficacy for mitigating procedural pain. It is available in oral, rectal, and intravenous (i.v) form. Acetaminophen is administered in dose of 35-45 mg/kg by rectal route. Repeated dosing is 20 mg/kg every 6 hours in infants and children and every 12 hours in newborns. Paracetamol i.v is administrated in a dose of 7.5 mg/kg up to 4 times a day, by infusion over 15 minutes in children weighing less than 10 kg. The minimum interval between each administration must be 4 hours, and the maximum daily dose must not exceed 30 mg/kg. For children weighing more than 10 kg (and less than 33 kg), 15 mg/kg, up to 4 times a day, with maximum daily dose not exceeding 60 mg/kg is recommended (without exceeding 2 g). It has been shown to be effective in treating post-operative pain. [14],[15]

Ketorolac is available both as oral tablets (10 mg) or i.v injections (15 mg/ml and 30 mg/ml). It is efficacious as a sole analgesic for minor procedures. However, in acute renal failure, [16] prolonged prothrombin time and hypersensitivity have been reported to occur with its usage. Dose of ketorolac is 0.5 mg/kg i.v, every 6 hours for less than 5 days.

Opioids

With the advent of short-acting opioids, morphine is no longer preferred for short procedures. For procedural sedation, shorter acting opioids like fentanyl are preferable. A single intravenous dose of fentanyl 1-4 μg/kg has rapid onset (<30 s) with a peak at 2-3 min and brief clinical duration (20-60 min). The initial i.v boluses of 0.5-2 μg/kg may be given over 2-5 min titrated to effect, followed by infusion of 0.2-2 μg/kg/h for maintenance of analgesia. As sedation does not occur at low doses (1-2 μg/kg), the concurrent administration of midazolam is required. The combination of fentanyl and midazolam is a safe and popular regimen for procedural sedation and analgesia in children. [17] When given in concert, both should be given in reduced doses to minimize the chance of hemodynamic or respiratory compromise. The effectiveness of oral transmucosal preparation of fentanyl is variable, titration is difficult, and the incidence of emesis is as high as 31-45% [18] Remifentanil is an ultra-short-acting opioid agent that has an onset of action of about 1 min and an elimination half-life of less than 10 min. It has been used successfully as a sedative agent in children. [19],[20] It is given as an infusion of 0.05- 0.10 μg/kg/min in combination with midazolam. In case of invasive procedures, before cessation of the remifentanil infusion, a longer acting analgesic may be administered to ensure analgesia when the patient awakens from sedation.

Benzodiazepines

By activating γ-aminobutyric acid, benzodiazepines produce sedation, anxiolysis, amnesia, and anticonvulsant effects. [21] After administration, respiratory depression should be watched for. Time to peak effect for midazolam is brief with i.v administration (2-3 min) and duration is short (45-60 min). Midazolam can also be administered via the intramuscular, oral, intranasal, and rectal routes. The oral route can lead to unreliable concentrations in serum and clinical effect due to first pass hepatic metabolism. The intranasal route irritates the mucosa, which is painful and produces anxiety in the child. It does not have any analgesic properties and requires supplemental analgesia for painful procedures. Paradoxical reactions, characterized by inconsolable crying, disorientation, agitation, and restlessness, have been reported in children receiving midazolam, especially after rapid i.v injection. [22] For upper gastrointestinal endoscopy or bronchoscopy, use of additional topical anesthetic is useful.

Barbiturates

Pentobarbital produces a deep sleep with minimal movement and is popular for use during radiological (non-invasive) procedures. It is given in dose of 2-5 mg/kg/dose slow i.v` or 2-6 mg/kg/dose intramuscularly not to exceed 100 mg/dose by either route. Oral route has been also used and was found to be better than chloral hydrate. [23] Pentobarbital and chloral hydrate when compared for sedation of infants undergoing MRI and CT scan studies were found to be equally effective, but pentobarbital was better tolerated. [24] Barbiturates have antanalgesic effects and are unsuitable for sedating children for painful procedures.

Chloral hydrate

Chloral hydrate is a pure sedative-hypnotic drug without analgesic properties, once widely used during non-painful diagnostic procedures. [25] It has an aromatic, pungent odor and a slightly bitter, caustic taste, which may not be acceptable to children. Chloral hydrate can cause airway obstruction and respiratory depression at higher doses (75-100 mg/kg). [26] Although restricted in some countries due to risk of potential carcinogenicity, the American Academy of Pediatrics has not found enough evidence to avoid single doses of chloral hydrate for this reason alone. [27] Wheeler and colleagues conducted a randomized, blinded comparison of chloral hydrate and midazolam for procedural sedation and found no difference in mean time for onset of sedation between the two groups, but mean time to recovery was significantly shorter with midazolam. [28] Successful sedation was achieved in 93% of the chloral hydrate patients compared to only 36% of the midazolam group. No adverse events were reported in either group. Its unpredictable onset, long duration, and the lack of a reversal agent make chloral hydrate far from an ideal sedative.

Ketamine

The state of "dissociative sedation" of ketamine is characterized by profound analgesia, sedation, amnesia, and immobilization. Upper airway muscular tone and protective airway reflexes are maintained and spontaneous respiration is preserved [29] although when administered i.v (dose is 1-1.5 mg/kg), it must be given over 1 min to prevent transient respiratory depression. Unpleasant emergence reactions are uncommon in children and teenagers and are typically mild. [30] There is no evidence of any benefit from the prophylactic administration of concurrent benzodiazepines in children, [31] and their role should be confined to treating unpleasant reactions if they arise. Ketamine has been extensively used in pediatric patients in emergency department, radiology, burns dressings, and other painful procedures. It is an ideal sedative in patients with bronchospasm, hypovolemia, and shock.

Propofol

The emergency department, gastroenterology, and critical care literature showed that propofol can be given to children in these settings with good efficacy, apparent safety, and rapid recovery. [32],[33] Use of an analgesic is imperative in addition to propofol for painful procedures. Propofol has a wide array of benefits, including anticonvulsant activity, antiemesis, and ability to reduce intracranial hypertension. Propofol infusion syndrome seems an unlikely concern for procedural sedation. The risk factors include poor oxygen delivery, sepsis, serious cerebral injury, and high-dose propofol. [34] Propofol was found to have a safe profile in 17, 066 pediatric patients sedated in a variety of hospital settings. [35] Paspatis et al.[36] compared oral midazolam and propofol versus propofol alone in 54 children undergoing endoscopy. The recovery time for the midazolam group was significantly longer, but the ease of i.v. line placement, parental separation, and patient comfort were significantly better in this group. The rates of respiratory and hemodynamic complications were similar between the two groups, with the midazolam group requiring significantly less additional propofol. Propofol is at least as effective as midazolam in providing desired levels of sedation with an early recovery profile. Ketofol, mixture of ketamine, and propofol is a popular combination used for PSA.

Etomidate

Etomidate has a rapid onset of action, a short duration agent with a relatively mild adverse effect profile. However, it may block cortisol production, and this appears to be its most significant drawback and limits its long-term use. Etomidate has been found to be more effective and efficient than pentobarbital and midazolam and equally safe as propofol. [37],[38],[39] A study comparing ketamine versus etomidate for procedural sedation in children has been completed and results are awaited.

Dexmedetomidine

Dexmedetomidine is a highly selective alpha-2 adrenoreceptor agonist with sedative, anxiolytic, and mild analgesic properties with no depressant effect on respiratory drive. In 2008, approval was granted for its use in non-intubated patients requiring sedation. Although it does not have US FDA approval for use in children, its use has been well described in multiple settings. [40] It is administered as a loading dose of 0.5-1 μg/kg over 10 minutes followed by an infusion of 0.2-1 μg/kg/hr. In a study by Koroglu et al., propofol when compared with dexmedetomidine provided a faster onset of action and time to recovery than dexmedetomidine but also resulted in more episodes of hypotension and oxygen desaturation. [41] Dexmedetomidine as sole agent for invasive procedures has not always been successful. Combination of ketamine and dexmedetomidine speeds up the onset of sedation process while neutralizing the side effects of each other. [42] Though no single agent fulfils the criteria of an ideal agent for PSA [Table 3], dexmedetomidine approaches close to it [Table 4]. Over the last decade, it is being widely used for the purpose of sedation all over the world.
Table 3: Ideal agent for procedural sedation and analgesia

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Table 4: Comparative properties of different drugs

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Indian scenario

In Indian context, use of agents like remifentanil, dexmedetomidine, and etomidate is restricted due to their non-availability or limited supply. Remifentanil is still not available but will soon be marketed in India. Use of dexmedetomidine is continually increasing as more and more centers acquire it. Till then, midazolam and ketamine are the most commonly used drugs used for PSA in India. [43] The monitoring practice varies from one center to another depending on facilities available. There is a need for further research regarding sedation and analgesia practices in India. The ASA guidelines recommended that only personnel with training in the delivery of general anesthesia should administer sedation as it is likely that children may pass into a deeper level of sedation than originally intended. [44] Level III evidence suggests that PSA with propofol, including deep sedation, is equally safe in the hands of anesthesiologists and non-anesthesiologists provided they are well-trained and are part of a dedicated sedation team. [45]


   Conclusion Top


Though professional skill and knowledge remain the determining factors, the goal should be to practice and promote safe sedation and analgesia. The introduction of newer pharmacologic agents and better monitoring devices helped us to achieve this. With an ever increasing load of out of operating room procedures, non-anesthesiologists should be formally trained to deliver PSA and manage complications should they occur.

 
   References Top

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    Tables

  [Table 1], [Table 2], [Table 3], [Table 4]



 

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