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Application of vocal organ correction combined with language training in the rehabilitation of children with cerebral palsy and language disorder

Background To explore the effect of vocal organ correction combined with language training on the rehabilitation of children with cerebral palsy (CP) and language disorder. Methods A total of 98 children with CP and language disorder were divided into two groups (49 cases in each group) using a random number table: the control group and the test group. The control group was given language training alone, while the test group received vocal organ correction combined with language training. The changes in language function classification, efficacy, and family satisfaction before and after the treatments were compared. Results A significant difference was identified in language function classification between the two groups before and after treatment (P<0.05). The language function classification of the two groups was also significantly different after treatment (P<0.05), as was the distribution of clinical efficacy between the two groups (P<0.05). The total effective rate for the test group was 91.84%, which was higher than the 73.47% for the control group (P<0.05). Family satisfaction between the two groups differed significantly (P<0.05), and the total satisfaction rate of families in the test group was 87.76%, which was higher than the 69.39% in the control group (P<0.05). Conclusions Vocal organ correction combined with language training can improve the language function of children with CP and language disorder, has ideal efficacy, and can also enhance family satisfaction during rehabilitation.


Introduction
Cerebral palsy (CP), a common neurological disease in children, refers to a syndrome resulting from various nonprogressive injuries during brain development within 1 month after birth. CP is a lifelong condition that can be extremely harmful for the patient's health. The main clinical manifestations of CP are abnormal posture and motor disorders (1). The causes of CP are diverse and multifactorial, including congenital, hereditary, inflammatory, infectious, hypoxia, traumatic and metabolic (2). With an

Original Article
Application of vocal organ correction combined with language training in the rehabilitation of children with cerebral palsy and language disorder © Translational Pediatrics. All rights reserved.
Transl Pediatr 2020;9(5):645-652 | http://dx.doi.org/10.21037/tp-  incidence of approximately 80%, language disorder is a common complication among patients with CP (3). Bilateral adrenal cortex and oral motor dysfunction are the main causes of language disorders in patients with CP. The lack of language acceptance and expression skills is very common and is closely related to mental retardation (4). At present, there are more and more researches on language disorders in children with CP. A population-based study examining 84 children with CP showed participants were impaired across linguistic subdomains indicating a generalized language deficit, and co-occurring receptive and expressive language impairment was common (5). Choi et al. collected the brain MRI and language assessment reports of 172 children with CP between 3 and 7 years of age and found that both receptive and expressive language development quotients (DQs) were significantly related to PVWL or deep gray matter lesion severity (6). The clinical treatment of language disorder caused by CP is extremely challenging. Language disorders are mostly due to the corresponding neurological dysfunction caused by brain injury, and clinical treatment is extremely difficult. Microcurrent reflexotherapy combined with cortexin was used in the complex treatment of speech disorders in patients with CP (7). In China, acupuncture has proved to be effective in improving language impairment in children with CP (8). It has also been reported that vitamin D assisted rehabilitation therapy is effective in the language function and language development of children with CP and language disorder (9). Language training is a common rehabilitation program for patients with CP with language disorder. It mainly includes articulation training, pronunciation training, vocabulary training, and short sentence training. The aim of the training is to improve the patient's language function, but it takes a long time for the training to have an effect. Therefore, patients and their families often give up the training, which affects the clinical efficacy. Furthermore, for some patients with severe language disorders, this method alone has unsatisfactory efficacy (10,11). Vocal organ correction, which is a common adjuvant treatment for children with language disorders, can reduce the difficulty and improve the clinical efficacy of language training (12). In this randomized controlled trial, the efficacy of vocal organ correction combined with language training for the rehabilitation of children with CP and language disorder was explored. We present the following article in accordance with the CONSORT reporting checklist (available at http://dx.doi.org/10.21037/ tp-20-223).

Clinical data
The study subjects were 98 children with CP and language disorder who were treated in our hospital between January 2015 and March 2018. All procedures performed in this study involving human participants were in accordance with the Declaration of Helsinki (as revised in 2013). This study was approved by the Ethics Committee of Tong De Hospital of Zhejiang Province (2014 Scientific Research Quick Review No. 065). Signed informed consent was obtained from each patient. All of the children met the screening criteria for inclusion. The patients were equally divided by random number table into the control group and the test group. The study subjects included 50 males and 48 females, aged 1-7 years (average age: 3.10±0.52 years). The types of language disorder were articulation disorder (70 cases) and language development delay (28 cases). The Gesell language development quotient (DQ) scores ranged from 35-60 (average score: 46.72±6.83). As shown in Table 1, no significant differences were observed in gender, average age, type of language disorder, or Gesell language DQ between the two groups (all P>0.05).

Screening criteria
To be included, children needed to meet the diagnostic criteria of CP (13), and met the diagnostic criteria of language impairment in children through language development survey (14). Informed consent from the child's parents/guardians was also a requirement for participation.
The exclusion criteria were as follows: congenital vocal organ hypoplasia with comorbidities of congenital hypoplasia or disorder in other parts of the body; a previous history of craniocerebral trauma; other types of comorbidity, such as heart failure; or difficulty for a child or their family to cooperate to complete this study.

Study methods
The children in the control group were given language training, which was as follows: (I) Articulation training: (i) Respiratory training: the children were guided and helped to control their respiratory airflow by blowing trumpets, balloons, windmills, and other devices. The devices ranged from small to large, and from simple to difficult.
The children performed these activities twice a day, for 10 minutes each time. (ii) Tongue training: the children performed a variety of tongue exercises, mainly including sticking the tongue out and putting it back, rolling it back, lifting it to lick the palate, and moving it bilaterally. Under the care of professional doctors, the children practiced tongue flexibility by licking a lollipop, and this was combined with tongue exercises. The children performed these exercises twice a day, for 10 minutes each time. (iii) S u c k i n g t r a i n i n g : t h e c h i l d r e n w e r e encouraged to suck liquid from a cup using a thick, short straw, which was eventually replaced with a thin, long straw to increase the difficulty. This was carried out twice a day, for 10 minutes each time. The articulation training lasted for 3 months. (II) Pronunciation training: (i) Bilabial "p", "b", and "m" sounds: the children were told to carefully watch the physician's mouth movements and patterns, and then asked to repeat the sound. This training was carried out twice a day, for 10 minutes each time. (ii) Velar "k" and"g" sounds: the children were instructed not to touch their palate with their tongue. Those with greater difficulty to control this kind of touch were placed in the supine position with their legs flexed to the chest, and the professional physicians used a tongue depressor to limit their tongue movement and encouraged them to to practice their pronunciation through audiovisual skills. This training was carried out twice a day, for 10 minutes each time. (iii) Dental and linguodental sounds, including "i", "d", and "n". The children were placed in the prone position with their limbs relaxed and extended. The professional physician lifted the child's head and flexed it forward slightly.
The physician encouraged the children to imitate their pronunciation. This training was carried out twice a day, for 10 minutes each time. (III) Vocabulary training: (i) Two-word vocabulary training: initially, the simplest and most commonly used reduplicated words were used for training, such as "baba (dad)", "ma ma (mom)," "ye ye (grandpa)", and "nainai (grandma)". The words gradually increased in difficulty, with transition to the words commonly used in daily life. This training was carried out twice a day, for 10 minutes each time; (ii) Three-word vocabulary training: the children trained with words such as "liang tang tang (bright)", "xiao bao bao (baby)", and "xiaojiahuo (little boy/girl)". This training was carried out twice a day, for 10 minutes each time. (iii) Multiple-word vocabulary training: the c h i l d r e n t r a i n e d w i t h w o r d s s u c h a s "gaogaoxingxing (happy)", "kai kaixinxin (happy)", and "kuaikuai le le (happy)". This training was carried out twice a day, for 10 minutes each time. Vocabulary training lasted for 3 months. (IV) Short sentence training: the children were guided to perform training with short sentences such as "bao bao chi fan (Time to eat, baby)" and "bao baozhen bang (You are so great, baby)". The sentences were gradually lengthened to increase the difficulty. This training was carried out twice a day, for 10 minutes each time. Short sentence training lasted for 3 months. The children in the test group were given language training along with vocal organ correction. The training was focused on correcting the following vocal organs, according to the results of vocal organ disorder assessment. The details of training are as follows: (I) Oral lip dyskinesia: (i) Upper lip muscle correction: first, Renzhong (GV26) was pressed with the thumb pulp, kneaded gently (20 times), point-pressed (5 times), and massaged (3-5 times). Then, Dicang (ST4) was pressed 5 times. (ii) Lower lip muscle correction: the thumb pulp was used point, press, knead, rub, grasp, and push on the lower lip muscle for 2-3 min. Then, Lianquan (CV23) was point-pressed 5 times, and the upper and lower lip muscles were pinched gently for passive motion. (II) Tongue dyskinesia: the children were asked to stretch out and draw back the tongue. If the children had difficulty stretching their tongue fully, the tip of the tongue was covered with gauze and pulled outwards. If the tongue could be stretched laterally, resistance was applied with a tongue depressor to enhance the motor ability of tongue muscles. If the tongue could not be stretched laterally, a cotton rod was used for passive stimulation, and the tongue muscles were tapped at the root to relax them. The tongue was pressed and kneaded for 5-10 minutes daily. (III) Mandibular dyskinesia: Ermen (TE21) was massaged for several seconds, the root of ear and the muscles outside the tragus were kneaded up and down, and Yifeng (TE17) was point-pressed. After the tension in the muscles had been relieved, Ermen (TE21) was point-pressed with the thumb, and the mandible was moved up and down using the other four fingers. Jiache (ST6) was pointpressed 7-8 times a day. (IV) Soft palate dyskinesia: (i) Oral-nasal separation treatment: the children were placed in the supine position. They were instructed to close their mouth and breathe through their nose. The nose was then pinched to cause the children to breathe through the mouth. If a child had difficulty understanding the breathing instructions, the physician gave a demonstration, or gently pinched the child's lips to force them to breathe through the nose, and then pinched their noses to force them to breathe through the mouth. The children alternated between breathing through the nose and mouth for 2-3 minutes. (ii) Velopharyngeal closure treatment: the children sucked the straw with one end of it blocked. The straw was inserted into a cup and the child was told to breathe in or inserted into warm water and the child was told to blow. If the child did not cooperate, passive training could be given to guide the child to puff out their cheek. (V) Respiratory dyskinesia: the children were placed in the supine position, and instructed to take a deep breath and hold it. The professional physician put pressure with the appropriate speed and strength on their chest and abdomen, so that the child passively, and for as long as possible, made the "a, a" sound. The children were given deep breath and blowing training. Qiangyin, Hongyin, Dazhui (GV14), and Tiantu (CV22) were point-pressed. The children underwent 1 year of treatment in total.

Observation indicators
(I) Changes in language function classification before and after treatment were assessed using the Chinese Rehabilitation Research Center (CRRC) signsignificate (S-S) relations examination method. Stage 1: difficultly understanding objects and events. Stage 2: a basic understanding of objects, including functional operation (2-1), matching (2-2), and selection (2-3). Stage 3: symbols of objects, including gesture symbols (3-1) and speech symbols (3-2). Stage 4: words, sentences, and main sentence components, including two-word sentences (4-1) and three-word sentences (4-2). Stage 5: grammatical rules, including word order (5-1) and the passive voice Respondents were asked if they were very satisfied, satisfied, or not satisfied with the training. Total satisfied rate = very satisfied rate + satisfied rate.

Statistical analysis
SPSS 26.0 software (IBMCorp. Armonk, USA) was used for all statistical analysis. Normally distributed measurement data were described as mean ± standard deviation (SD) and were analyzed using t-tests. Enumeration data were described as percentage, and classification distribution data were analyzed by rank-sum test. The enumeration data between the two groups were analyzed by chi-squared test. P<0.05 was considered to be statistically significant.

Changes of language function classification before and after treatment
As shown in Table 2, there was a significant difference in language function classification between the two groups before and after treatment (P<0.05). After treatment, a significant difference was found in language function classification between the two groups (P<0.05).

Clinical efficacy
As shown in Table 3, there was a significant difference in the distribution of clinical efficacy between the two groups (P<0.05), and the total effective rate in the test group was higher than that in the control group (P<0.05).

Family satisfaction
The difference in the distribution of family satisfaction between the two groups was statistically significant (P<0.05), and the total satisfaction rate of families in the test group was higher than that in the control group (P<0.05). See Table 4.

Discussion
Language communication disorder, language symbol disorder, and language expression disorder are more severe in children with CP and language disorder. The language level of such children is obviously low, making it difficult for them to communicate normally and effectively with others, which inflicts great harm on their physical and mental health (15). Improving the language ability of children with CP and language disorder during rehabilitation is important for their quality of life, as well as for the development of their physical and mental health (16), and can also reduce the mental burden on their families. Language training includes articulation training, pronunciation training, vocabulary training, and short-sentence training. The difficulty of training can be gradually increased to improve a child's language function. However, due to the young age of children during language training, it is difficult for professional physicians to operate, and the results for some children are unsatisfactory. Therefore, there is still significant room for improvement with this program. Clinicians should focus on how to effectively enhance the language function and efficacy of children with CP with language disorder. This study showed that after treatment, the language function classification was significantly improved in the test group and the control group compared with that before treatment. After treatment, the language function classification in the test group was significantly better than that in the control group. The distribution of clinical efficacy in the test group was also significantly better than that in the control group. The total effective rate of the test group (91.84%) was significantly higher than that of the control group (71.47%). These results indicate that vocal organ correction combined with language training in rehabilitation treatment for children with CP and language disorder can significantly improve language function, with significant clinical efficacy. Vocal organ correction included targeted corrective measures such as oral lip dyskinesia, tongue dyskinesia, mandibular dyskinesia, soft palate dyskinesia, and respiratory dyskinesia. Each targeted training significantly improves the function of the related vocal organs, especially motor function, and also enhances flexibility. The correction therefore improves the effect of pronunciation training and enhances the efficacy of language training. Compared with language training alone, vocal organ correction combined with language training has significant efficacy, and the language function classification and overall rehabilitation efficacy of children with CP and language disorder are improved (17,18). In a study of 128 children with CP and language disorder, Taub (19) showed that among different age groups and different language disorders, vocal organ correction combined with articulation training can achieve good efficacy. The language disorder of children with cerebral palsy are complex, and dysarthria is the main manifestation of language barriers (20), including dysphonia, resonance, and language development delay. In this study on vocal organ correction and articulation training, vocabulary training and short-sentence training were also combined, to better improve language function and clinical efficacy. It has certain effects on children with different types of language disorders. Our findings showed that the combination of vocal organ correction and language training could synergistically enhance the language function of children with CP and language disorder. Furthermore, the distribution of family satisfaction in the test group was significantly better than that in the control group. The total satisfaction rate for the test group was 87.76%, significantly higher than the 69.39% for the control group. There are a number of reasons for this. First, the combination of the vocal organ correction and language training has a better effect on the improvement of the language function, with satisfactory rehabilitation results. Also, vocal organ correction requires professional physicians to help the children to complete the tasks with patience and a gentle attitude. This increases the opportunities for communication between the physician and the children and their families, and thus effectively brings a closer doctorpatient relationship.
In summary, vocal organ correction combined with language training should be used in the rehabilitation of children with CP and language impairment. This combination not only effectively improves the language function of such children, but also obtains the optimal effect, with high satisfaction among children's families, Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the noncommercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.