Tracheobronchial intubation using flexible bronchoscopy in children with Pierre

Ying-Long Ye, Cai-Feng Zhang, Li-Zhen Xu, Hui-Feng Fan,Jun-Zheng Peng, Gen Lu, Xiao-Yin Hu

Abstract

Key Words: Clinical nursing; Pediatrics; Surgical nursing; Patient safety; Operating room

lNTRODUCTlON

Flexible bronchoscopy (FB) has become a progressively popular diagnostic method for airway evaluation in children[1,2]. Also, when mask ventilation or tracheobronchial intubation (TI) is expected to be challenging, FB is advantageous in airway safety when it is used to guide TI[3,4].

Pierre Robin sequence (PRS) is a congenital disability in humans, which is characterized by facial abnormalities[5]. It is featured by micrognathia (abnormally small mandible), glossoptosis (downwardly displaced or retracted tongue), and obstruction of the upper airway[6]. At present, mandibular distraction osteogenesis is a new treatment option for children with PRS, which can relieve upper airway obstruction by gradually lengthening the mandible[7,8]. However, Yinet al[3] reported difficult intubation in 71% of children with PRS before surgery. Therefore, the stomatologists strongly recommended that TI using FB was performed for PRS children preoperatively, which had the following advantages: indication of the location of airway obstruction in children, elimination of airway obstruction below the tongue level, and reduction of the difficulty of endotracheal intubation[4,9]. The previous study indicated that endotracheal intubation using FB is safe and effective even in neonates with PRS[10,11].

However, it is a new challenge to perform TI using FB for nurses who lack experience. Some research investigated the incidence and severity of complications of TI using FB in adults[12], but children were not investigated. In this study, we analyzed the demographic characteristics, success rates of intubation, the time required for intubation, number of intubation attempts, and postoperative complications of children with PRS and those with common pneumonia who did not have a difficult airway.

MATERlALS AND METHODS

Ethical consideration

The protocol was approved by the Medical Ethics Committee of Guangzhou Women and Children’s Medical Centre (approval No. [2020] 24901), and the study was conducted following the Declaration of Helsinki.

Study design

An observational controlled study was performed. Children with PRS who underwent TI using FB before mandibular distraction osteogenesis were enrolled, and children with common pneumonia and no difficult airway that required bronchoscopy were set as the control group.

Setting and samples

The participants were 105 children with PRS from the Department of Stomatology, and 108 children with common pneumonia from the Department of Respiratory Medicine, at Children’s Hospital in Guangzhou, China, from January 2016 to January 2019. The procedures were performed in the bronchoscopy room of the respiratory department. Inclusion criteria of the PRS group were: Children with PRS who underwent mandibular distraction osteogenesis; aged ＜ 12 mo; and informed consent was obtained from the children’s parents or guardians. Exclusion criteria were: combined with other severe diseases,e.g., pulmonary arterial hypertension, cancer, pulmonary dysplasia, severe congenital heart disease; critical disorder; or the patient’s guardian disagreed with the study. Inclusion criteria of the control group were: Children with pneumonia and no difficult airway; aged ＜ 12 mo. The bronchoscopy operators were all qualified and specialized in bronchoscopy. The nurses had an equivalent level and experience in both groups.

Measurement and data collection

The data were collected from the perioperative records and other electronic medical records according to the survey items. The demographic data, success rates of intubation, the time required for intubation, number of intubation attempts, and the incidence of perioperative complications in the two groups were assessed. The time required for intubation referred to the interval between entrance of a bronchoscope into the nasal cavity and passing through the glottis. The attempts at intubation were also recorded. The possible complications included laryngeal edema (LE), epistaxis, bradycardia, bronchospasm, adverse drug reactions, transitory pyrexia, pneumothorax, hypoxemia, and respiratory depression.

Data analysis

The data were analyzed by SPSS for Windows version 25.0 (IBM, Armonk, NY, United States). The measurement data obeying a normal distribution were described by mean ± SD, and an independentsamplettest was performed; otherwise, the distance between median and quartile was M (Q1-Q3), and a Mann-WhitneyUtest was performed. Frequencies and ratios were used to describe the numerical data, and Fisher’s exact test was performed.P＜ 0.05 was considered statistically significant.

Preparation and monitoring of patients

Preparation of patients:Medical history of children included in this study was evaluated. Specialists in FB encouraged parents to provide accurate medical information about their children, and the specialists actively answered questions raised by parents and provided the necessary data. All parents included in the study signed the written informed consent forms.

罗素《西方哲学史》的独到与缺失——基于问题导向的“文本研读”实践系列之一 ………………………………… 简圣宇（5/75）

Preoperative preparation:It was ensured that the children were fasted for 6 h and refrained from drinking fluids for 2 h to avoid reflux of gastric contents and aspiration during the perioperative period. The infants with low glycogen reserves were intravenously injected with glucose solution in the ward after fasting for 2 h to prevent hypoglycemia and dehydration. Besides, first-aid medicines and first-aid kits were provided. A nurse evaluated the children’s tolerance to the surgical procedure. Lidocaine (2%) was inhaled to reduce cough response. The nurse placed the children in the supine position and simultaneously monitored and supplied oxygen. Additionally, airway secretions were reduced by intravenous injection of atropine. In the control group, intravenous injection of midazolam was carried out by an anesthetist, as the first choice for moderate sedation. In the PRS group, TI using FB was performed on conscious patients to avoid airway relaxation, which increases the difficulty of TI.

Surgical nursing procedures:Principles of aseptic technology were followed throughout the procedures of TI using FB. For the PRS children, the first step was to remove nasal secretions. In the second step, the nurse attempted to insert the endotracheal tube into one side of the nasal cavity to explore whether it was smooth, and the malformed stenosis of the nasal meatus was excluded accordingly. In the third step, the surgeon stood behind the child’s head, the nurse and anesthetist stood on the right side of the child’s head, and the assistant helped hold up the child’s lower jaw to separate the epiglottis from the pharyngeal wall. In the fourth step, the nurse lubricated the outer wall of the FB by silicone oil, while they kept the surface of the endotracheal tube from the oil. In the fifth step, the nurse separated the endotracheal tube connector, inserted the endotracheal tube over the FB, and then pulled the endotracheal tube to the top of the FB. In the sixth step, the surgeon inserted the FB through the nose to observe the epiglottis, oropharynx, larynx and trachea, ascertaining contraindications for intubation. If there were no contraindications, the surgeon continued to place the FB in the central airway. In the seventh step, the nurse gently inserted the endotracheal tube into the airway, and the surgeon confirmed the location of the catheter by auscultation.

Postoperative care:In the control group, postoperative resuscitation was carried out in the postanesthesia care unit, which was equipped with emergency intervention equipment. During resuscitation, nurses closely monitored the child’s electrocardiography and percutaneous oxygen saturation. All the children were fasted and restrained drinking fluids for approximately 2 h to avoid reflux and aspiration. In the PRS group, the children were sent directly to the operating room for operation after catheterization.

RESULTS

There was no significant difference in age and gender between the two groups; however, the weight difference between the two groups was significant (Table 1). There were no deaths during the perioperative period. The success rate of the intubation was 100% for the children in the two groups, while the success rate at the first attempt of children in the PRS group was significantly lower than that in the control group (88.6%vs98.2%,P= 0.005). The time required for intubation in the PRS group was significantly longer than that in the control group (P＜ 0.001), and children in the PRS group needed more attempts of intubation than those in the control group to enter the glottis successfully (P= 0.017). Meanwhile, the incidence of complications was markedly higher in the PRS group (50/105, 47.6%) than that in the control group (36/108, 33.3%) (P= 0.034) (Table 1), such as LE, epistaxis, bronchospasm and hypoxemia. Seven of 105 PRS children experienced LE (6.7%), compared with one (0.9%) in the control group. The rate of LE differed markedly between the groups (P= 0.034). Out of the seven patients who had LE, the mean age was 1.19 ± 0.82 mo, the mean weight was 3.33 ± 0.75 kg, the time required for intubation was 65 (58-68) s, and there were two or three reintubation attempts for the bronchoscope and endotracheal tube. All seven patients were managed with steroids: six recovered with inhaled steroids alone before extubation, and one was given systemic corticosteroids before recovery. There was no significant difference (P＞ 0.05) in other complications, such as epistaxis, bradycardia, tracheospasm, adverse drug reactions, transitory pyrexia, pneumothorax and hypoxemia, between the PRS and control groups.

DlSCUSSlON

Since most children with PRS had difficult feeding, their body weight was lower compared to the control group. In the present study, the success rate of endotracheal intubation using FB in children with PRS was 100%, which was noticeably higher compared with other intubation-based methods. Previous research indicated that endotracheal intubation was achieved in only 13 of 35 (37%) children with PRS under direct laryngoscopy, and intubation using FB was applied to the remaining 22 of 35 (63%) who failed[11]. Sanfilippoet al[13] reported that the success rates of video-laryngoscopy and direct laryngoscopy in difficult tracheal intubation were 83% and 55%, respectively, while the rate was equal to 100% in the current research. However, in terms of complications, direct laryngoscopy is prone to endanger children’s lives due to a high failure rate of intubation[13]. Although video-laryngoscopy also has high success rates in difficult tracheal intubation[9], the reported failure rates and severe complications must be taken into account[14]. To date, there have been fewer hemodynamic responses and adverse events during endotracheal intubation using FB[15,16]. Therefore, FB may be a promising alternative for the management of difficult tracheal intubation.

In the present study, we also analyzed complications, the time required for intubation, and number of attempts of intubation in the two groups. TI is often complicated by subglottic edema in children[17], which may be characterized by hoarseness or dyspnea after extubation, or both[18]. In the current research, LE was the most prominent complication in children with PRS (6.7%), the incidence of which was higher compared to the control group (0.9%). The incidence of LE in our study was consistent with that reported in some previous studies (6.7%)[19]. Previous research indicated that difficult intubation is a significant risk factor for LE[20]. It was also found that the success rate at the first attempt in the PRS group was significantly lower than that in the control group (88.6%vs98.2%,P= 0.005). The present study also indicated that the time required for intubation was 31.0 (25-37) s, and the number of attempts at intubation was one in the PRS group. Among the seven patients who had LE, the time required for intubation was 65 (58-68) s, and there were two or three attempts at bronchoscopy and endotracheal intubation. Therefore, we should further concentrate on the number of attempts required for intubation and avoid multiple intubations. In addition, among the seven patients who had LE, the mean age was 1.19 ± 0.82 mo and the mean weight was 3.33 ± 0.75 kg, which were lower than 2.25 ± 0.36 mo and 3.84 ± 0.82 kg in the PRS group. It is suggested that we should pay attention to low weight and young age of children with PRS who undergo TI using FB in the future, since they may be more likely to develop LE.

In the current research, we might primarily focus on the possible risk factors at endotracheal intubation to prevent the occurrence of LE. A recently published guideline recommended the selection of an appropriate-size endotracheal catheter, which was made of soft-materials[21]. A previous study pointed out that a surgeon should select an appropriate catheter according to children’s age and weight, which may reduce the risk of obstruction of the catheter to the glottis[22]. The recent studies have reported that an ultrasmooth endotracheal catheter can be selected, due to its ultraslippery, nonirritating, and anti-inflammatory hyaluronic-acid-based coating to mitigate intubation injury, and the friction coefficient was reduced by 77% compared to the normal endotracheal catheter in a Crab-eating monkey experiment[23,24]. Moreover, aseptic medical-oil-based lubricants should be used to lubricate the front end of the tracheal tube before intubation to lower the friction and lessen the risk of mucosal injury. One study reported that failure of intubation was found in 10% of children due to failure to lubricate the front end of the catheter[25]. Meanwhile, the duration of intubation should be shortened, and number of attempts at intubation should be reduced as much as possible, as these are both significant risk factors for LE[18]. In future research, we need to pay attention to some key points, such as proper position and orientation of the catheter and bronchoscope lens, and catheter materials,

Table 1 Demographic characteristics and postoperative complications of patients

etc.

CONCLUSlON

The success rate of intubation using FB is high for children with PRS and is a promising alternative for the management of difficult tracheal intubation. The incidence of postoperative complications of TI using FB, especially LE, is higher in children with PRS compared to children with pneumonia.

ARTlCLE HlGHLlGHTS

Research motivation

The incidence and severity of complications of TI using FB in children remain to be investigated.

Research objectives

This study aimed to analyze demographic characteristics, success rates of intubation, the time required for intubation, number of intubation attempts, and postoperative complications of children with PRS and those with common pneumonia who did not have a difficult airway.

Research methods

105 children with PRS from the Department of Stomatology, and 108 children with common pneumonia from the Department of Respiratory Medicine, at Children’s Hospital in Guangzhou, China, from January 2016 to January 2019 were recruited. The procedures were performed in the bronchoscopy room of the respiratory department. The data were collected from the perioperative records and other electronic medical records according to the survey items. The demographic data, success rates of intubation, the time required for intubation, number of intubation attempts, and the incidence of perioperative complications in the two groups were assessed. Furthermore, the attempts of intubation were also recorded. The possible complications were observed.

Research results

There was no significant difference in age and gender between the two groups; however, the weight difference between the two groups was significant. There were no deaths during the perioperative period. The success rate of intubation was 100% for the children in the two groups, while the success rate at the first attempt of children in the PRS group was significantly lower than that in the control group (88.6%vs98.2%,P= 0.005). The time required for intubation in the PRS group was significantly longer than that in the control group (P＜ 0.001), and children in the PRS group needed more attempts of intubation than those in the control group to enter the glottis successfully (P= 0.017). The incidence of complications was markedly higher in the PRS group (50/105, 47.6%) than in the control group (36/108, 33.3%) (P= 0.034). Seven of 105 PRS children experienced LE (6.7%), compared with one (0.9%) in the control group. The rate of LE differed markedly between the groups (P= 0.034). Out of the seven patients who had LE, the mean age was 1.19 ± 0.82 months, the mean weight was 3.33 ± 0.75 kg, the time required for intubation was 65 58-68 s, and there were two or three reintubation attempts for bronchoscopy and endotracheal intubation. All seven patients were managed with steroids: six recovered with inhaled steroids alone before extubation, and one was given systemic corticosteroids before recovery. There was no significant difference (P＞ 0.05) in other complications between the PRS group and control group.

Research conclusions

Given the high success rate of intubation using FB for children with PRS, it is a promising alternative for the management of difficult tracheal intubation. The incidence of postoperative complications of TI using FB, especially LE, is higher in children with PRS compared to children with pneumonia.

Research perspectives

Effective care measures for the complications of TI using FB in children with PRS will be further explored, and the prevention of LE remains to be improved in the future.

FOOTNOTES

Author contributions:Zhang CF, Hu XY and Fan HF studied conception and design; Ye YL, Xu LZ and Peng JZ contributed to data collection; Zhang CF and Lu G contributed to data analysis and interpretation; Ye YL, Zhang CF, and Fan HF contributed to drafting of the article; Hu XY and Fan HF contributed to critical revision of the article; Ye YL and Zhang CF contributed equally to the manuscript.

lnstitutional review board statement:The protocol was approved by the Medical Ethics Committee of Guangzhou Women and Children’s Medical Centre (approval No.[2020] 24901).

自20世纪以来,人类一直梦想能够设计出代替手工劳动的各种机械臂.自动化技术的蓬勃发展使得人类梦想变为现实.机械臂的发展涉及多种学科,包括机械、电路控制、计算机及仿生学等.目前,机械臂的驱动方式包括气动驱动、电动机驱动和液压驱动等[1].气动驱动方式成本较低、维护方便、质量轻,但是轨迹跟踪精度低;电动机驱动方式体积较小、结构简单、价格较低,但是功率质量比不足;液压驱动方式具有运动精度高、功率质量比大、传递负荷和环境适应能力较强等特点.因此,机械臂驱动方式大多采用液压驱动,从而掀起了设计者对机械臂液压驱动方式研究热潮.

lnformed consent statement:All participants, or their legal guardian, signed informed consent before study.

Conflict-of-interest statement:The authors declare that they have no conflict of interests.

Data sharing statement:Technical appendix, statistical code, and dataset available from the corresponding author at hxk8133565@126.com.

STROBE statement:The authors have read the STROBE Statement—checklist of items, and the manuscript was prepared and revised according to the STROBE Statement—checklist of items.

Open-Access:This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BYNC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is noncommercial. See: https://creativecommons.org/Licenses/by-nc/4.0/

Country/Territory of origin:China

ORClD number:Ying-Long Ye 0000-0002-8220-5776; Cai-Feng Zhang 0000-0001-9820-7103; Li-Zhen Xu 0000-0002-3088-317X; Hui-Feng Fan 0000-0002-1127-4256; Jun-Zheng Peng 0000-0002-9633-4181; Gen Lu 0000-0001-9702-6167; Xiao-Yin Hu 0000-0003-3302-6912.

S-Editor:Liu JH

L-Editor:Kerr C

P-Editor:Liu JH