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Medical Studies/Studia Medyczne
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Porównanie sedacji pediatrycznej przy zastosowaniu podawanych doustnie midazolamu i ketaminy oraz midazolamu i prometazyny

Farzad Bozorgi
1
,
Iraj Gholikhatir
1
,
Seyed Jaber Mousavi
2
,
Mahsa Rahiminejad
3
,
Abolghasem Lali
3

  1. Department of Emergency Medicine, Orthopedic Research Center, Mazandaran University of Medical Sciences, Sari, Iran
  2. Department of Community Medicine, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
  3. Babol University of Medical Sciences, Babol, Iran
Medical Studies/Studia Medyczne 2021; 37 (1): 33–41
Data publikacji online: 2021/03/31
Plik artykułu:
- A comparison of oral.pdf  [0.14 MB]
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Introduction

Practical guidelines for sedation and analgesia may vary from place to place. Sedation without anaesthetics can be applied to any intervention that causes pain in the patient [1]. Paediatric sedation differs from adult sedation because of differences in size, weight, age, cardiovascular and respiratory mechanisms, and differences in basal metabolism between children and adults. Children are usually brought to the emergency room due to painful illnesses and injuries. More painful or unpleasant diagnostic and therapeutic measures may be required during the visit. The cooperation of the child patient with the physician is the primary precondition for the care, and if the physician cannot properly establish this cooperation in the child, one can certainly not expect success and effective treatment.
Therefore, it is expected to be a safe and effective way to relieve pain to sedate children. Recent articles have suggested an increasing preference for the use of sedation and general anaesthesia in the treatment of anxious children [2–4]. There are numerous therapeutic strategies, including the use of drugs or non-pharmacological approaches to sedate or change behaviour in paediatric patients [5, 6]. Most methods are based on the use of different medications and methods of administration that provide sedation as one of their main effects. Sedatives can be administered inhalation, orally, rectally, subcutaneously, intramuscularly, or intravenously. The easiest and most acceptable method of drug administration, especially in children, is oral administration [7]. Because it is often well received by patients, the administration is simple and inexpensive, and the risk of adverse events is low due to the slow absorption of the drug [8].
There is a lot of evidence on the use of a variety of medications for sedation by trained physicians in the emergency department. In particular, ketamine has been extensively studied with its simultaneous sedation and soothing [9]. According to a meta-analysis of over 8000 cases, the use of ketamine as the only sedative in children between 2 and 13 years old is safe [10]. Ketamine also shows good sedative effects following oral administration [11]. Of course, ketamine metabolite, i.e. norketamine, can also be used for sedation with minimal side effects. Salivary secretion, hallucinations, and dysfunction in doses greater than 6 mg/kg orally are more pronounced [11]. Permetazine, also known as antihistamine, is a phenothiazine-derived product with anti-vomiting, anti-dizziness, and anti-histamine effects, and it is soothing and analgesic before and after surgery. In oral use, after 20 min, its sedative effects begin, and they persist for 4–6 h [12].
Midazolam is also a drug that is used alone or in combination with promethazine for sedation in children who require a specific procedure [4, 13, 14]. Among these drugs, benzodiazepines are commonly used as precursors in children [15]. Midazolam is most commonly used in children as benzodiazepine because it has a broad safety margin a soothing dose interval with a toxic dose is high, it does not have active metabolites, and its half-life is short (about 30 min), with the time of a procedure It is in harmony. After taking it, it takes 15 to 30 min of sedation while at the same time giving the patient a relatively quick return to normal. It also has an antagonist and has a neutralizing effect [14].
The use of a combination of drugs and a specific prescription method is common to increase efficacy and safety, and to increase patient acceptance. Since the superiority of ketamine is a characteristic of forgetfulness and analgesic, relative cardiovascular stability and its limited effects on the respiratory system [16], and on the other hand, as sedation by benzodiazepines does not produce analgesic effect. By using the combination of ketamine and midazolam, it is possible to initiate more rapid analgesia, more effective forgetfulness, and reduce the dose of ketamine required and reduce the hallucination prevalence [4, 17–19]. The oral combination of midazolam and promethazine is also a safe and effective way to calm children during dental treatments. The combination of these drugs has a greater advantage over their separate use, so that initiation of treatment is quicker and hence is sufficient for emergency medical treatment.

Aim of the research

Therefore, the aim of this study was to compare the efficacy of midazolam and oral ketamine with midazolam and oral promethazine in paediatric sedation.

Material and methods

We conducted a randomized, double-blinded, 2-arm, superiority clinical trial. The work was approved by the local ethics and research committee in Mazandaran University of Medical Sciences, and the procedures were done between 2014.11.22 and 2015.05.21. The samples were children aged 2 to 10 years, with American Society of Anesthesiologists (ASA) classification I or II, who required midazolam for procedural sedation and analgesia for surgical procedures such as laceration repair conducted in the emergency department. The exclusion criteria were upper airway infection, cardiovascular diseases, head trauma, open eye trauma, CNS disorders, any contraindication for sedation, history of taking sedation or opioids, and ASA class more than 3. Written informed consent was obtained from the patient’s parents or guardians. In addition, an assent was obtained from all children older than 7 years.
The study was registered at the Iranian Registry of Clinical trials (identifier: IRCT20180717040509N2). The study was conducted at a university-affiliated (educational), tertiary care hospital in a level 1 trauma centre with 92,000 patient visits per year, including approximately 1200 children who receive procedural sedation and analgesia every year. For initial assessment and weight measurement, standard monitoring including SpO2 by pulse oximetry, blood pressure by sphygmomanometer, respiratory rate, pulse rate, and temperature was performed. Then simple random allocation was done. Both groups received oral midazolam 0.5 mg/kg. Then, the patients of group 1 received oral ketamine 5 mg/kg (57), and group 2 received oral promethazine (1 mg/kg) [20, 21]. Medications were prepared by the clinical pharmacist in the form of 2 syrups containing midazolam-ketamine and midazolam-promethazine. Syrups were dissolved in 20 ml cranberry to make it tasty. The children drank the syrups in a glass through a straw.
The children were separated from their parents when they were drowsy and confused. If these signs were absent, the separation was made 30 min after taking the medicine. For preparation of syrups, 50 mg/ml ketamine hydrochloride ampoule from Gmbh ROTEXMEDICA, Germany, Midazolam 5 mg/ml ampoules from chemotherapy company Iran and promethazine syrup mg/ml from Tehran Pharmaceutical Company, Iran Chemical Manufacturing Co. were used. For caution, we provided emergency resuscitation equipment, including anaesthetics and intubation devices, free oxygen, epinephrine, and tube trachea. Apnoea was defined as SpO2 below 92% for more than 15 s or lack of respiratory symptoms based on vision or respiratory sounds in the stethoscope for more than 15 s, except for cases of crying or motion. The outcomes were measured and recorded by a junior emergency resident who was unaware of the treatment group allocation; PR, BP, RR, and SpO2 were measured every 5 min and temperature every 15 min.
Sedation severity was measured using the Ramsay Sedation Scale [22]. We used the Houpt grading scale to record the degree of sedation and irritability in children during separation from their parents, the overall behaviour of the child during surgery, and patient crying at the time of taking the drug and at the time of treatment. Recovery time was classified as short (less than 30 min), medium (between 30 to 60 min), or long (more than 60 min). Analgesia severity was evaluated through the Visual Analogue Scale (painless to worst pain). The presence of nausea and vomiting in patients was also measured by observation and questioning. After observing the criteria including stable cardiovascular system, open airway, response to stimulations, seating and speech ability, and the presence of the child’s guardian, the patient discharged. We explained to families the discharge instructions after receiving analgesics and sedation in the children.

Statistical analysis

Raw data were analysed using SPSS software version 19. Data were described in terms of mean ± standard deviation (± SD) or frequencies (number of cases) and percentages when appropriate. Comparison of numerical variables between the study groups was done using Student’s t-test or Mann-Whitney U test for independent samples. For comparing categorical data, the chi-square (2) test was performed. Fisher’s exact test was used instead when the expected frequency was < 5. P < 0.05 was considered statistically significant.

Results

Of the 102 children studied, 49 (48%) were male and 53 (52%) were female. Comparison of the 2 groups in terms of gender, using Fisher’s exact test, showed no significant difference (p = 1.000). The mean age of the studied children (between 2 and 10 years) was 5.73 ±2.74 years in the midazolam-ketamine group and 5.59 ±2.53 years in the midazolam-promethazine group. Comparison of mean age of children in the 2 groups using the t-test with independent samples showed no significant difference (t = 0.263, p = 0.793). Also, the standard monitoring results of the studied patients were compared including systolic and diastolic blood pressure, respiratory rate, pulse rate, and arterial oxygen saturation in both groups during sedation time, every 5 min to 40 min, and the temperature of the patients was measured during sedation every 15 min to 35 min, indicating no significant differences between blood pressure, respiratory rate, arterial oxygen saturation, and temperature in the 2 groups during the follow-up period (p > 0.05). However, comparing the pulse rate of the patients under study showed a significant difference between the 2 groups at the 5th min (t = 2.69, p = 0.009).
Trends in the degree of Ramsey sedation of children were studied in each of the midazolam-ketamine and midazolam-promethazine groups during sedation. According to Figure 1, the degree of child sedation in both groups has an increasing trend, but comparing the differences between the 2 groups during the follow-up period using analysis of variance with repeated measures indicates a significant difference between the 2 groups (p = 0.03). The Ramsey sedation rate at every 5 min of sedation except for 5 and 15 min in the midazolam-ketamine group showed significantly better sedation than in the midazolam-promethazine group. Degree of sedation and irritability in children during separation from their parents, general behaviour of children during surgery and labour, severity of crying of children when taking medication or treatment, based on Houpt Rating Scale and quality of child analgesia, were evaluated with the VAS criterion and the 2 groups were compared at the end (Tables 1 and 2). The results showed that the mean degrees of sedation and irritability in children during separation from their parents were significantly different between the 2 groups, and the midazolam-ketamine group had a better sedation rate than the midazolam-promethazine group. This result was also found in the general behaviour of children during surgery and labour and was significantly better in the midazolam-ketamine group than in the midazolam-promethazine group. Also, evaluation of the quality of analgesia in children in the 2 groups indicates greater effectiveness of midazolam-ketamine in paediatric sedation compared to midazolam-promethazine.
The results of comparing the severity of crying in the 2 groups at the time of treatment and drug administration showed that there was no significant difference between the midazolam-ketamine and midazolam-promethazine groups at the time of drug use and at the time of treatment. By comparing the recovery time of the children in the 2 groups, it was found that there was a significant difference between them. Based on the findings in Table 3, the recovery time of patients in the midazolam-ketamine group was significantly shorter than that of the midazolam-promethazine group. In terms of side effects, only 2 cases of nausea and vomiting (3.9%) were reported in the midazolam-ketamine group, and there were no specific adverse events in the midazolam-promethazine group (p = 1.000).

Discussion

Intervention with midazolam-ketamine was more successful in behavioural inhibition in children. In children who underwent surgery, anxiety due to parent separation presents as psychological tension, agitation, slow sleeping, and abnormal behaviours. On the other hand, surgery and anaesthesiology in 2–10-year-olds has a profound impact on their psychological condition in the future. Surgery and anaesthesiology with anxiety can have destructive effects in the future. In order to perform paediatric surgery or a procedure in an emergency setting, synergy between the surgeon and child is an essential prerequisite. If a physician cannot properly develop this partnership in the child, he/she cannot be expected to succeed and treat the patient appropriately. In this regard, several therapeutic approaches have been used, including drugs or non-pharmacological methods [5, 6]. Although non-pharmacological methods such as audio-visual techniques are effective in reducing children’s anxiety, they are not enough, and it is necessary to take medication. Among these precursor drugs, benzodiazepines are commonly used [15]. What is important in prescribing premedication is to ensure that the adequate dosage is obtained to achieve adequate sedation [3, 23].
There is an increasing preference for the use of sedation and general anaesthesia to treat anxiety in very young children. The present clinical trial shows that both protocols are safe. The positive effect of the drug combination used in this trial was to achieve a favourable sedation using the minimum dose of the drug. One of the safest and most short-sedation medications for midazolam is Benzodiazepine. This drug is widely used in emergency medical applications [2]. Ketamine is known as an anaesthetic agent and has been used as a sedative for several years [2, 24, 25]. Promethazine is also an antihistamine with a mild sedation effect [26]. In our investigation, all children drank the oral drugs, and only 2 cases (midazolam-ketamine) needed to be fed by syringe.
Due to the fact that emergency procedures usually involve various stimuli that include low to moderate pain stimuli, waiting times should be considered in a way that coincides with the onset of the maximum effect of the drug. Emergency procedures usually involve various painful stimuli, so a sedative drug should be considered with an onset time (waiting times) that coincides with the peak time. Shapira’s study offered a 30-minute period for separating children in a midazolam-promethazine regimen. PSC’s protocol proposes a 30-minute waiting period.
If the waiting time is prolonged, the child may have an emotional response, paradoxically. When the child is not sleepy or confused, the waiting time may be too short. On the other hand, in some cases the child may fall asleep within a short period of time after taking the medication, and it is only 45 min after taking the medication. Hasty et al. stated that sedation outcomes will be better if painful stimuli such as injection or placement of clamps are scheduled simultaneously with the peak time of the sedative agent [27]. In most relevant studies the waiting time has not been investigated or reported [21, 28, 29]. It is suggested that this issue be considered in future studies. In the study of Alderson, who used 5 mg/kg oral ketamine as a premedication, a favourable sedative result was achieved after 20 min [30]. In our study this time was 30 min and 35 min for the midazolam-ketamine and midazolam-promethazine groups, respectively.
In the use of a sedative, in addition to the sedation properties of the safety aspect of the drug, it is important to evaluate the physiological parameters. Medication drug safety, investigated by physiologic parameters, is also important, along with sedation properties. In this study, no patient had SpO2 (arterial oxygen saturation saturation) less than 95%. For both groups, all physiological parameters including SpO2 and vital signs were within normal range, and no significant between-group differences were found.
In a study conducted by Gilger et al. in 2004, the use of midazolam and meperidine was associated with more hypoxaemia compared with midazolam and ketamine [31]. There was no case of hypoxaemia during sedation or during the procedure in both groups. The main advantages of ketamine are amnesia, inducing analgesia, relative cardiovascular stability, and its limited effects on the respiratory system. Benzodiazepine-induced sedation does not produce analgesia. Using a ketamine – midazolam compound results in faster induction of analgesia, more effective amnesia, less hallucination, and lower dosage of ketamine. The oral combination of midazolam and promethazine has shown successful and safe sedative results. The combination of these drugs has a greater advantage over their separate use, so initiation of treatment is quicker and sufficient time for more emergency medical treatment is provided. Using the combination of these drugs, in comparison with their separate use, has many advantages, including faster initiation of treatment and more time to perform emergency procedures.
Shapira’s investigation showed that in children who received midazolam-promethazine combination compared with midazolam alone, there is a greater likelihood of a more relaxed or sleepy reaction within 30 min. This is attributed to the combination of midazolam and promethazine [21]. In this study, the 2 groups had a significant difference in terms of Ramsay sedation, overall behaviour of the child during separation from its parents and during the procedure, pain in the VAS scale, and recovery time. One case of profound sedation was seen in the midazolam-ketamine group. Several studies have shown the sedative and anti-anxiety effects of oral ketamine in children before surgery. The results of a study have shown that in paediatric surgeries, the use of oral ketamine within 30 min before surgery and when the child is in the arms of the parents can reduce fear, induce sedation, and increase patient collaboration [32].
Sedative medications are useful for copying anxiety in patients and facilitating treatment for physicians. In our investigation, a significant percentage of children showed high scores for Houpt and Ramsey scales (indicating greater collaboration). Therefore, it can be said that both drug groups are somewhat effective in soothing children. The effects of midazolam-ketamine were significantly better than midazolam-promethazine. Several studies have demonstrated that midazolam has favourable sedation results in terms of acceptable behaviour, ranging from 76.6% to 100% of intervention individuals, depending on the used medicinal forms (including oral and intranasal) and doses [33–37]. In our study, in the majority of participating children, especially in the midazolam-ketamine group, were so calm that the treatment was completed satisfactorily.
Kain et al., by examining serum levels of midazolam in children who did not respond to the drug, showed that serum levels of midazolam were similar to those in the group responding appropriately. They believed that the lack of response to medication was due to the pharmacodynamic properties of midazolam (the effect of medicine on the body), not the pharmacokinetics (the effect of the body on the drug, which includes the process of absorption, distribution, and metabolism). They recommend alternative methods, such as changing the type of medication, deep sedation, or general anaesthesia, for these people [38]. According to the findings of this study, children who are less than 4 years old and behave emotionally do not respond to midazolam. These researchers found that the serum level of midazolam was similar in responsive and non-responsive individuals. They believe that the lack of response was due to the pharmacodynamic and not the pharmacokinetic properties of the drug. They suggested alternative methods such as changing the type of medication, deep sedation, or general anaesthesia.
Roelofse et al., in a randomized trial, compared trimeprazine-methadone with oral ketamine-midazolam in the sedation of children aged 2–7 years, for oral surgery. The dose of ketamine in this study was 5 mg/kg and the midazolam dose was 0.5 mg/kg. They concluded that the combination of oral ketamine and midazolam is a safe, effective, and practical way of controlling children for oral surgery under local anaesthesia [39]. The results of this study are comparable with those of Darlong et al. In the mentioned study, the 2 groups included a low oral dose of midazolam (0.25 mg/kg) and ketamine (3 mg/kg), and a high oral dose of midazolam (0.5 mg/kg) and ketamine (6 mg/kg). They concluded that a low oral dose of midazolam and ketamine compared to high oral doses would be an effective method for premedication in children undergoing ophthalmic surgery. In that study, none of the children became deeply sedated, and their behaviour during separation from their parents in the low-dose combination group was better than that of the midazolam-alone group [40].
The results of this study can also be compared with those of Jain et al. They compared the use of oral midazolam alone (0.5 mg/kg) with placebo and a combination of midazolam (0.25 mg/kg) and ketamine (1 mg/kg) as premedication for venipuncture for CT scan in paediatric patients. They concluded that a low oral dose of midazolam and ketamine or midazolam alone, both without significant side effects, effectively reduced venipuncture stress. However, the combination of midazolam and ketamine in comparison to midazolam alone puts more children in tranquillity [41]. In the present study, which was conducted on the 2 age-, sex-, and surgical area-matched groups, it was determined that the evaluated responses are similar in girls and boys in terms of prevalence and severity. So, it can be concluded that the incidence of preoperative anxiety reactions has no relation to the child’s sex. On the other hand, it has been shown that both ketamine and oral promethazine can be used to relieve children before surgery, but ketamine is more likely to be effective than promethazine. In a way that this drug regimen has been able to reduce the reaction of children during procedure in comparison with oral midazolam-promethazine to a much greater extent and to achieve a mild reaction.
Papineni et al. conducted a systematic review about the side effects of sedation with oral midazolam in paediatric dentistry in 2012. Based on this review, no significant life-threatening side effects were reported in any of the studies. Minor side effects had low frequency, and most of them were nausea and vomiting [42], which was a similar condition to our study. The incidence of ketamine-induced hallucination is more common in adults than in children and may be reduced by taking benzodiazepines at the same time [43]. Although the side effects of ketamine have been reported rarely in studies involving intravenous or muscular use, it seems that due to the slower absorption of this drug by oral administration, these complications are fewer and this method is safer and less risky [44, 45]. In our study, in the midazolam-ketamine group, only 2 cases of nausea and vomiting (3.9%) were observed. The results of Alfonzo-Echeverri’s study showed a higher frequency of nausea and vomiting in ketamine use [46].
In our study, as in other similar studies, there was no evidence of aspiration. It is thought that vomiting during the recovery time, during which airway reflexes are intact, is a reason to prevent aspiration [47]. We did not observe any case of rash in the 2 groups. Meanwhile, Karapinar reported a prevalence of 1.1% in the use of venous midazolam-ketamine combination [16].

Conclusions

Oral combination of midazolam (0.5 mg/kg) and ketamine (5 mg/kg) leads to safe and effective sedation for medical procedures in young children. Use of this compound, in comparison with the oral combination of promethazine (1 mg/kg) and midazolam (0.5 mg/kg), causes less consciousness, coughing, and movement during treatment. Also, this combination reduces excitement, preoperative anxiety, and fear, which results in positive outcomes for minor emergency procedures and decreased physical and mental harm in children following a more soothing emergency environment.
Other reasons for taking this medication are its low cost, availability, increased satisfaction of the patients and their parents, and non-use of an injectable method that is a painful and distressing. Also, emergency specialists can easily use this favourable method of sedation without worrying about the increased side effects. According to these findings, the oral midazolam-ketamine combination with determined dose may be recommended, 30 min ago, in paediatric patients undergoing surgical or diagnostic-therapeutic procedures in which short-term analgesia and sedation are required, including dental procedures, bone marrow puncture, spinal cord puncture, needle biopsy, dressing especially in burn wards, catheterization such as dialysis or angiography.

Conflict of interest

The authors declare no conflict of interest.

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