Effects from Fiber Orientations of Bovine Pericardium on its Compression Performance / 医用生物力学

Objective To investigate the mechanical behavior of bovine pericardium with different orientations after compression and evaluate its effects on the duration of transcatheter aortic valve. Methods According to the fiber directions, the pericardial strips were divided into 12 groups of transverse, longitudinal and oblique pericardial strips, and each group included 3 strips of pericardium. One strip maintained the original state, and the other two strips were under 12.5 N and 25 N compression, respectively for 1 h. The mechanical properties of compressed samples were tested and analyzed subsequently in uniaxial tension test. Results The samples with different orientations showed obvious anisotropy before and after compression. The secant modulus, elastic modulus and ultimate tensile strength of the longitudinal pericardium were generally greater than those of the oblique pericardium, while the oblique pericardium was larger than the transverse pericardium. For longitudinal and oblique bovine pericardium under 25 N compression, the average tensile strength ratio was 0.92 and 0.87, respectively, and the ratio of tensile strength before and after compression had a significant difference (P＜0.05). The average tensile strength ratio of transverse bovine pericardium after 25 N compression was 0.97, and there was no significant difference in the ratio of tensile strength before and after compression (P＞0.05). Conclusions The compressive damage of the pericardia with different fiber orientations was very small under low stresses at transitory time. For design and production of transcatheter aortic valves, the orientations of the pericardium and the changes of strength after compression should be taken into consideration.

Evaluation of bovine pericardium performance after liquid nitrogen freezing and thinning / 生物医学工程学杂志

In the present study, the performance of the liquid nitrogen frozen and thinned bovine pericardium was studied and compared with the porcine pericardium. The microstructure and mechanical properties of the bovine pericardium were observed and tested by hematoxylin-eosin (HE) staining and tensile test respectively. In all conditions, porcine pericardium was selected as a control group. The results showed that there was little difference in the performance of bovine pericardium after being frozen by liquid nitrogen. The secant modulus and ultimate strength of the thinned bovine pericardium were similar to those of porcine pericardium, however, the elastic modulus was a little higher than porcine pericardium. The study suggested that the performance of the thinned bovine pericardium was similar to those of porcine pericardium. It was easy for the thinned bovine pericardium to obtain a relatively ideal thickness and expected performance, therefore, the thinned bovine pericardium can be used as the materials of transcatheter aortic valve leaflets.

Laryngeal clefts: a review of current literature / 中华耳鼻咽喉头颈外科杂志

Laryngeal clefts as exceptionally rare congenital anomalies have been reported more and more recently. The clinical symptoms and presentations base on degree of clefts and variety of comorbidities. Mild types of clefts may have minimal clinical impact, whereas severe types may be life-threatening and even lead to death before diagnosis. With more attention of these anomalies and advances in endoscopy, the diagnosis, evaluation and surgery of laryngeal clefts have acquired great improvement, especially International Pediatric Otolaryngology Group(IPOG)have reported consensus guidelines on the diagnosis and management of type Ⅰ laryngeal clefts in 2017. This review of laryngeal clefts may be beneficial to decrease missed diagnosis or misdiagnosis and to achieve individual-based treatment.

Pediatric laryngeal clefts: an experience in the diagnosis and management of 13 cases / 中华耳鼻咽喉头颈外科杂志

Objective@#To investigate the diagnosis and management of laryngeal cleft.@*Method@#The clinical data of 13 cases of laryngeal cleft treated between 2007 and 2015 was analyzed retrospectively.@*Results@#The children with laryngeal cleft were classified according to the classification of Benjamin-Inglis, as type Ⅰ(11 cases), typeⅡ(1 case) and type Ⅲ(1 case). All patients were confirmed by microlaryngobronchoscopy under general anaesthetic. Eleven typeⅠ and 1 type Ⅱ clefts were managed conservatively, with which all type Ⅰ patients were successfully managed, while the type Ⅱ patient was resolved by surgical endoscopy. The type Ⅲ patient was treated by open repair but the results was poor.@*Conclusions@#Patients who suffered with choking on feeding or recurrent aspiration pneumonia, especially coexisted with other congenital malformation, needed detailed evaluation for laryngeal cleft, although which was a rare congenital abnormality. Electronic laryngoscope could be the first step to screen the cleft, while microlaryngobronchoscopy is the gold standard for diagnosis of laryngeal cleft. The majority of children with lower type clefts can be managed conservatively. Surgical endoscopy has high success rate when strictly following the indication. Type Ⅲ and Ⅳ clefts have high mortality for usually combining with severe complications and abnormalities.

Olfactory function in children with adenoid hypertrophy who underwent adenotonsillectomy during pre- and post-operative period / 中华耳鼻咽喉头颈外科杂志

Objective@#To assess the olfactory function in children with adenoid hypertrophy and investigate the changes of both olfactory function and appetite in children with adenoid hypertrophy before and after adenoidectomy.@*Methods@#Forty-four children with adenoid hypertrophy admitted for adenoidectomy, aged 7-12 years, mean age (10.0±2.0) years were tested by Sniffin′ Sticks test and visual analog scale(VAS) of the children′s appetite preoperatively between March and August 2015.In a appointment 6 months after operation, all of them returned and were tested again. The control group consisted of 40 healthy children, aged 7-12 years, mean age (11.2±0.8) years.SPSS 13.0 software was used for statistical analysis@*Results@#The olfactory function of the study group TDI scores (32.4±3.5) preoperatively were significantly lower in comparison with the results of the control group TDI scores (37.3±2.8)(t=7.057, P<0.001). Significant improvement of olfaction TDI scores (36.8±1.9) was observed in the follow-up appointment(t=13.573, P<0.001). The VAS of the children′s appetite during post-adenoidectomy was higher compared to pre-adenoidectomy(t=16.765, P<0.001). There was a strong correlation between the increase in appetite of children and the change of TDI score (r=0.59, P<0.01).@*Conclusions@#Children with adenoid hypertrophy have a reduced ability of both olfactory function and appetite. Surgery had a greater impact on olfaction and appetite.

Causes and management of pediatric spontaneous tonsillar haemorrhage / 中华耳鼻咽喉头颈外科杂志

Objective@#To analyze the causes and management plan of pediatric spontaneous tonsillar haemorrhage(STH).@*Methods@#According to the criteria of STH difined by Griffies, patients with STH from December 2013 to January 2016 were included in this retrospective study.@*Results@#A total of 11 patients were reviewed. The etiological diagnosis included 3 pediatric Epstein-Barr virus associated infectious mononucleosis(EBV-IM), 3 suspected pediatric EBV-IM to 3 acute suppurative tonsillitis, 1 acute viral tonsillitis and 1 hemophilia A. The management strategies included antiviral, antibacteria, transfusion, surgical examination followed with bipolar coagulation hemostasis under general anesthesia. No patient treated with tosillectomy.@*Conclusions@#STH is now a rare condition, the causes of which in child are more or less different from adult.This emergency can be treated in time if a detailed management plan for pediatric STH is formulated.

Management of nasal orbital cellulitis in children / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To analyze the clinical characteristics, diagnostic and treatment principle of orbital cellulitis in children, and to improve the experience of antibiotic treatment in orbital cellulites.</p><p><b>METHODS</b>Twenty children were admitted to Shenzhen Children's Hospital with the diagnosis of nasal orbital cellulitis between January 2009 and December 2013. The children were severe enough to warrant hospital admission. There were 13(65%) males and 7 (35%) females. The median age was 3.5 years (2 months to 7.2 years). The relationship between the serum C-reactive protein (CRP), white blood cell count and the hospitalization days were analyzed. The children were divided into 2 groups: Cefoperazone Sodium and Sulbactam Sodium for injection group and other antibiotic treatment group, the difference was compared. Statistical calculation was performed using SPSS 13.0 software.</p><p><b>RESULTS</b>The serum CRP [(29.8 ± 22.0) mg/L] at the time of admission had a positive correlation with the time of hospitalization[ (6.3 ± 4.1) d, r = 0.46, P < 0.05]. The time of CRP decreased to normal range after admission [(3.4 ± 1.8) d] were apparently related to the hospitalization time (r = 0.81, P < 0.01). The hospital days whose CRP could be decreased to normal within 3 days [n = 12, (4.3 ± 1.7) d] were significantly shorter than that in the others [n = 8, (9.1 ± 5.0) d, t = 2.61, P < 0.05]. The hospitalization of 12 cases with Cefoperazone Sodium and Sulbactam Sodium for injection [(4.3 ± 1.9) d] was shorter than that in other 8 cases with other drugs [(9.3 ± 4.7) d, t = 2.83, P < 0.05]. Bacterial pathogens were only identified in 4 children, including 3 cases of methicillin-resistant staphylococcus aureus (MRSA), 1 case of streptococcus anginosus. Only 1 case in 20 cases with positive blood culture for Staphylococcus aureus, consistented with the pus culture.</p><p><b>CONCLUSIONS</b>If early treatment at the first three days is valid, the course of nasal orbital cellulitis will be shorter and the orbital abscess can be prevented. Cefoperazone sulbactam and Sulbactam Sodium for injection is effective in treating pediatric orbital cellulitis.</p>

Clinical manifestations in pediatric laryngopharyngeal reflux / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To explore the clinical manifestations in pediatric laryngopharyngeal reflux and to provide more information on diagnosis and treatment.@*METHOD@#Sixty-two cases with recurrent respiratory infections, hoarseness and chronic cough were examined with reflux symptom index (RSI), reflux finding score (RFS), and 24-hour pH monitoring. Those who had at least two positive test for reflux were given PPI for diagnostic therapy.@*RESULT@#All patients completed reflux symptom index (RSI) questionnaire and underwent fiberoptic laryngoscopy, and reflux finding score (RFS) was evaluated. The positive rate of RSI and RFS was 91.94% and 79.03% differently. 24-hours pH monitoring and diagnostic therapy was about 30.76% and 85.48% differently. The symptoms show hoarseness 90.32%, postnasal drip 77.42%, difficulty swallowing 74.19%, abdominal pain and chest pain 72.58%, throat clearing 64.52%, chronic cough 56.45%, dysphagia 51.61%, throat abnormal feeling 48.39%. Laryngoscope examination shows inter-arytenoid erythema 100%, vocal mucosal oedema 75.81%, diffuse laryngeal edema 50.00%, posterior commissure hypertrophy 33.87%, subglottic edema 4.84%, no granuloma case. There was 16 cases showing positive in 24-hours pH monitoring test. The positive rate was 30.76%. All cases accepted diagnostic therapy. Fifty-three cases were effective. The positive rate was 85.48%.@*CONCLUSION@#There are no clinical presentations specific to pediatric laryngopharyngeal reflux. Patients often present with a wide range of atypical symptoms and signs. RSI questionnaire and RFS may provide diagnostic datas. Primary treatment includes lifestyle and medical therapy.

Clinical analysis on 368 children cases with tracheobronchial foreign body / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To investigate the clinical pathological features of children tracheobronchial foreign bodies and to improve diagnosis and treatment.@*METHOD@#A retrospective study 368 children cases with tracheobronchial foreign bodies in our hospital. Each patient was analyzed for age, sex, nature,complication and location of the foreign body, results of bronchoscopic removal and presence of foreign bodies in the airways. Among this cases, three of them coughed out the foreign body before operation; two of them failed to be operated for serious complication, others were conducted by rigid bronchoscopy and bronchoscopic removal with general anaesthesia.@*RESULT@#Three children of 368 coughed out the foreign body before operation; 4 children of them were dead for the long heartbeat respiratory arrest and deep coma; 2 children of them suffered form hypoxic ischemic encephalopathy and epilepsy; others were successfully taken out by operation.@*CONCLUSION@#For the diagnosis of children cases with tracheobronchial foreign bodies, it is very important to collect the detailed history of foreign body inhalation, physical examination and careful analysis on the findings from chest radiographs or CT scan.