Mucotomy is one of the most frequently applied surgical techniques for the management of inferior turbinate hyperplasia. Mucotomy guarantees patent airway, however, it might lead to the emergence of sicca syndrome. In...Mucotomy is one of the most frequently applied surgical techniques for the management of inferior turbinate hyperplasia. Mucotomy guarantees patent airway, however, it might lead to the emergence of sicca syndrome. In contrast, KTP (potassium titanyl phosphate) laser treatment spares the medial part of the inferior turbinate mucosa, contributing to maintenance of physiological nasal function. A retrospective comparative clinical study was performed to reveal the advantages and side-effects of both surgical methods in medium- and long-term in allergic rhinitis and non-allergic patients. Furthermore, we wished to determine the exact indications of the up-to-date laser treatment. Ninety-one of the 117 patients who underwent bilateral turbinate surgery during an 8-year period (2000-2007) responded to our questionnaire focusing on subjective postoperative changes. Patients were separated into 6 groups, based on the type of operation they underwent, the length of the follow-up and whether they suffered from allergies. The major complaint, nasal obstruction, improved in all 6 groups, which reached significance (p ? 0.05) in 4 groups. The most pronounced improvement was observed in the group of non-allergic patients with medium-term follow-up who underwent mucotomy. Nevertheless, a serious side- effect: crusting also increased significantly (p ? 0.05) in the latter group, while it was absent in allergic patients with medium-term follow-up, who underwent mucotomy. These results lead us to propose the following protocol for the treatment of inferior turbinate hyperplasia: 1) after unsuccessful conservative treatment, laser treatment is suggested for non-allergic patients;2) following unsuccessful conservative and even repeated laser treatment in the allergic group, mucotomy or turbinoplasty should be attempted.展开更多
Objective: In this study we aimed to compare the effects of submucosal cauterization of the inferior turbinate with or without inferior partial turbinectomy. Materials and methods: In this prospective cohort study, 60...Objective: In this study we aimed to compare the effects of submucosal cauterization of the inferior turbinate with or without inferior partial turbinectomy. Materials and methods: In this prospective cohort study, 60 patients with inferior turbinate hypertrophy were randomized and divided into two groups. The first one was submitted to submucosal cauterization associated with partial turbinectomy, and the second one only submucous cauterization. Five items were assessed to compare both methods: pain, nasal bleeding, scarring, crustation and nasal air way patency. Follow-up was performed on days 1, 14, 30 and 3 months later. Results: In both groups crusting formation was similar. Reactionary hemorrhage was more common in turbinectomy group. Scarring showed better results in the turbinectomy group in the first month postoperative, airway patency showed good results in 80% of the patients with turbinectomy. Conclusion: Submucosal cauterization with inferior partial turbinectomy has yielded better nasal patency when compared to submucosal electrocautery ablation alone.展开更多
1.IntroductionWith the increase of the capacity of the turbine generator set,the safety of the shaft system of the set(including the exciter)isthreatened for the following three reasons:1.The length of the shaft syste...1.IntroductionWith the increase of the capacity of the turbine generator set,the safety of the shaft system of the set(including the exciter)isthreatened for the following three reasons:1.The length of the shaft system increases.The length of theshaft system is 15 m for a 50 MW set,32-40 m for a 300 MW set and90 m for a 900 MW nuclear power set.The increased number of theconcentrated masses leads to the increase of both the number of展开更多
BACKGROUND Cases of turbinate mucocele or pyogenic mucocele are extremely rare.During nasal endoscopy,turbinate hypertrophy can be detected in patients with turbinate or pyogenic mucocele.However,in many instances,dif...BACKGROUND Cases of turbinate mucocele or pyogenic mucocele are extremely rare.During nasal endoscopy,turbinate hypertrophy can be detected in patients with turbinate or pyogenic mucocele.However,in many instances,differentiating between turbinate hypertrophy and turbinate mucocele is difficult.Radiological examinations,such as computed tomography(CT)or magnetic resonance imaging(MRI),are essential for the accurate diagnosis of turbinate mucocele.Herein,we report three cases of mucocele or pyogenic mucocele of turbinate,including their clinical presentation,imaging findings,and treatments,to help rhinologists understand this condition better.CASE SUMMARY Three cases of turbinate and pyogenic mucocele were encountered in our hospital.In all patients,nasal obstruction and headache were the most common symptoms,and physical examination revealed hypertrophic turbinates.On CT scan,mucocele appeared as non-enhancing,homogeneous,hypodense,well-defined,rounded,and expansile lesions.Meanwhile,MRI clearly illustrated the cystic nature of the lesion on T2 sequences.Two patients with inferior turbinate mucocele underwent mucocele lining removal,while the patient with pyogenic mucocele underwent endoscopic middle turbinate marsupialization.The patients were followed up on the first,third,sixth month,and 1 year after discharge,and no complaints of headache and nasal congestion were reported during this period.CONCLUSION In conclusion,both CT and MRI are helpful in the diagnosis of turbinate or pyogenic mucocele.Additionally,endoscopic nasal surgery is considered to be the most effective treatment method.展开更多
Objective To explore the feasibility of electroacupuncture compound anesthesia in radiofrequency ablation for hypertrophic inferior turbinate.Methods The patients confirmed to the enrolled criteria were randomly divid...Objective To explore the feasibility of electroacupuncture compound anesthesia in radiofrequency ablation for hypertrophic inferior turbinate.Methods The patients confirmed to the enrolled criteria were randomly divided into an observation group（n=31） and a control group（n=30）.In the observation group,electroacupuncture was applied to Sìbái（四白 ST 2）,Xiàguān（下关 ST 7）,Hégǔ（合谷 LI 4） and Zhīgōu（支沟 TE 6） on the left side for the anesthesia and the routine local anesthesia was done on the right side.In the control group,the routine local anesthesia was adopted on both sides.The feelings of pain,circulatory index and operation effect were observed and compared between the two groups.Results During radiofrequency ablation,the pain grades of two measurements on the left side and the 2nd measurement on the right in the observation group were all lower than those in the control group（all P〈0.05）.In the observation group,the pain grade on the left side was lower than that on the right side（P〈0.05）,and the systolic blood pressure and the heart rate were lower than those in the control group when undergoing the 2nd radiofrequency ablation on the right side and on the left side,respectively（all P〈0.05）.There was no significant difference in operation effect between the two groups.Conclusion Electroacupuncture compound anesthesia can meet the analgesia requirement of radiofrequency ablation for hypertrophic inferior turbinate,and would be helpful to prevent cyclic fluctuation during the operation at the same time.展开更多
The advantage of high efficiency, low SFC(Specific Fuel Consumption), ultra-high bypass ratio turbofan engine attracts more and more attention in modern commercial engine. The intermediate turbine duct(ITD), which con...The advantage of high efficiency, low SFC(Specific Fuel Consumption), ultra-high bypass ratio turbofan engine attracts more and more attention in modern commercial engine. The intermediate turbine duct(ITD), which connects high pressure turbine(HPT) with low pressure turbine(LPT), has a critical impact on the overall performance of turbine by guiding flow coming from HPT to LPT without too much loss. Therefore, it becomes more and more urgent to master the technique of designing aggressive, even super-aggressive ITD. Much more concerns have been concentrated on the duct. However, in order to further improve turbine, LPT nozzle is arranged into ITD to shorten low pressure axle. With such design concept, it is obvious that LPT nozzle flow field is easily influenced by upstream duct structure, but receives much less interests on the contrary. In this paper, numerical method is used to investigate the effects of length of ITD with upstream swirl blades on LPT nozzle. Nine models with the same swirl and nozzle blades, while the length of ITD is the only parameter to be changed, will be discussed. Finally, several conclusions and advices for designers are summarized. After changing axial length of ducts, inlet and outlet flow field of nozzle differs, correspondingly. On the other hand, the shearing stress on nozzle blade(suction and pressure) surface presents individual feature under various inlet flow. In addition to that, "Clocking-like effect" is described in this paper, which will contribute much to the pressure loss and should be paid enough attention.展开更多
BACKGROUND Sporadic cases of extranasopharyngeal angiofibroma in children,especially preschool children,have been reported in the literature.CASE SUMMARY We present a case of extranasopharyngeal angiofibroma in a 4-ye...BACKGROUND Sporadic cases of extranasopharyngeal angiofibroma in children,especially preschool children,have been reported in the literature.CASE SUMMARY We present a case of extranasopharyngeal angiofibroma in a 4-year-old boy.The presenting symptoms,imaging findings,treatment,histological appearance,and follow-up data are described in detail.For this patient,we performed embolization on two occasions,and then,resected the tumor completely.During the treatment,the patient developed a soft-palate perforation due to aseptic necrosis.However,the healing ability was good,and the perforation healed spontaneously.We additionally reviewed all pediatric cases of extranasopharyngeal angiofibroma published up to 30 June 2020 in the PubMed,Baidu Scholar,Scopus,and Web of Science databases.We identified 45 pediatric patients[average(10.98±4.86),boys 39(86.7%)].The highest proportion of cases occurred in adolescence[22(48.9%)].The top three sites of occurrence of extranasopharyngeal angiofibroma in children were the maxillary sinus,nasal septum,and inferior turbinate.CONCLUSION Extranasopharyngeal angiofibromas can occur throughout childhood,and predominantly present with nasal obstruction and spontaneous rhinorrhagia.展开更多
A lot of study has been made for the design and defining hot end initial parameters of steem turbine of large thermal power plant at home and abroad. But little study has been performed for the reasonable selection of...A lot of study has been made for the design and defining hot end initial parameters of steem turbine of large thermal power plant at home and abroad. But little study has been performed for the reasonable selection of some cold end parameters of steam turbine. The steam turbine cold end parameters defined in actual engineering project are somewhat unreasonable frequently. This paper describes some opinions for selecting some of the steam turbine cold end parameters, especially that of the turbine design back pressure and low pressure cylinder last stage blade length based on the regional features of meteorological conditions in China in association with the optimization of thermal power plant circulating water system.展开更多
文摘Mucotomy is one of the most frequently applied surgical techniques for the management of inferior turbinate hyperplasia. Mucotomy guarantees patent airway, however, it might lead to the emergence of sicca syndrome. In contrast, KTP (potassium titanyl phosphate) laser treatment spares the medial part of the inferior turbinate mucosa, contributing to maintenance of physiological nasal function. A retrospective comparative clinical study was performed to reveal the advantages and side-effects of both surgical methods in medium- and long-term in allergic rhinitis and non-allergic patients. Furthermore, we wished to determine the exact indications of the up-to-date laser treatment. Ninety-one of the 117 patients who underwent bilateral turbinate surgery during an 8-year period (2000-2007) responded to our questionnaire focusing on subjective postoperative changes. Patients were separated into 6 groups, based on the type of operation they underwent, the length of the follow-up and whether they suffered from allergies. The major complaint, nasal obstruction, improved in all 6 groups, which reached significance (p ? 0.05) in 4 groups. The most pronounced improvement was observed in the group of non-allergic patients with medium-term follow-up who underwent mucotomy. Nevertheless, a serious side- effect: crusting also increased significantly (p ? 0.05) in the latter group, while it was absent in allergic patients with medium-term follow-up, who underwent mucotomy. These results lead us to propose the following protocol for the treatment of inferior turbinate hyperplasia: 1) after unsuccessful conservative treatment, laser treatment is suggested for non-allergic patients;2) following unsuccessful conservative and even repeated laser treatment in the allergic group, mucotomy or turbinoplasty should be attempted.
文摘Objective: In this study we aimed to compare the effects of submucosal cauterization of the inferior turbinate with or without inferior partial turbinectomy. Materials and methods: In this prospective cohort study, 60 patients with inferior turbinate hypertrophy were randomized and divided into two groups. The first one was submitted to submucosal cauterization associated with partial turbinectomy, and the second one only submucous cauterization. Five items were assessed to compare both methods: pain, nasal bleeding, scarring, crustation and nasal air way patency. Follow-up was performed on days 1, 14, 30 and 3 months later. Results: In both groups crusting formation was similar. Reactionary hemorrhage was more common in turbinectomy group. Scarring showed better results in the turbinectomy group in the first month postoperative, airway patency showed good results in 80% of the patients with turbinectomy. Conclusion: Submucosal cauterization with inferior partial turbinectomy has yielded better nasal patency when compared to submucosal electrocautery ablation alone.
文摘1.IntroductionWith the increase of the capacity of the turbine generator set,the safety of the shaft system of the set(including the exciter)isthreatened for the following three reasons:1.The length of the shaft system increases.The length of theshaft system is 15 m for a 50 MW set,32-40 m for a 300 MW set and90 m for a 900 MW nuclear power set.The increased number of theconcentrated masses leads to the increase of both the number of
文摘BACKGROUND Cases of turbinate mucocele or pyogenic mucocele are extremely rare.During nasal endoscopy,turbinate hypertrophy can be detected in patients with turbinate or pyogenic mucocele.However,in many instances,differentiating between turbinate hypertrophy and turbinate mucocele is difficult.Radiological examinations,such as computed tomography(CT)or magnetic resonance imaging(MRI),are essential for the accurate diagnosis of turbinate mucocele.Herein,we report three cases of mucocele or pyogenic mucocele of turbinate,including their clinical presentation,imaging findings,and treatments,to help rhinologists understand this condition better.CASE SUMMARY Three cases of turbinate and pyogenic mucocele were encountered in our hospital.In all patients,nasal obstruction and headache were the most common symptoms,and physical examination revealed hypertrophic turbinates.On CT scan,mucocele appeared as non-enhancing,homogeneous,hypodense,well-defined,rounded,and expansile lesions.Meanwhile,MRI clearly illustrated the cystic nature of the lesion on T2 sequences.Two patients with inferior turbinate mucocele underwent mucocele lining removal,while the patient with pyogenic mucocele underwent endoscopic middle turbinate marsupialization.The patients were followed up on the first,third,sixth month,and 1 year after discharge,and no complaints of headache and nasal congestion were reported during this period.CONCLUSION In conclusion,both CT and MRI are helpful in the diagnosis of turbinate or pyogenic mucocele.Additionally,endoscopic nasal surgery is considered to be the most effective treatment method.
基金Supported by Foundation Project in Guang'anmen Hospital,China Academy of Chinese Medical Sciences:2006 S 195
文摘Objective To explore the feasibility of electroacupuncture compound anesthesia in radiofrequency ablation for hypertrophic inferior turbinate.Methods The patients confirmed to the enrolled criteria were randomly divided into an observation group（n=31） and a control group（n=30）.In the observation group,electroacupuncture was applied to Sìbái（四白 ST 2）,Xiàguān（下关 ST 7）,Hégǔ（合谷 LI 4） and Zhīgōu（支沟 TE 6） on the left side for the anesthesia and the routine local anesthesia was done on the right side.In the control group,the routine local anesthesia was adopted on both sides.The feelings of pain,circulatory index and operation effect were observed and compared between the two groups.Results During radiofrequency ablation,the pain grades of two measurements on the left side and the 2nd measurement on the right in the observation group were all lower than those in the control group（all P〈0.05）.In the observation group,the pain grade on the left side was lower than that on the right side（P〈0.05）,and the systolic blood pressure and the heart rate were lower than those in the control group when undergoing the 2nd radiofrequency ablation on the right side and on the left side,respectively（all P〈0.05）.There was no significant difference in operation effect between the two groups.Conclusion Electroacupuncture compound anesthesia can meet the analgesia requirement of radiofrequency ablation for hypertrophic inferior turbinate,and would be helpful to prevent cyclic fluctuation during the operation at the same time.
基金supported by National Natural Science Foundation of China(approval serial number:51406204)
文摘The advantage of high efficiency, low SFC(Specific Fuel Consumption), ultra-high bypass ratio turbofan engine attracts more and more attention in modern commercial engine. The intermediate turbine duct(ITD), which connects high pressure turbine(HPT) with low pressure turbine(LPT), has a critical impact on the overall performance of turbine by guiding flow coming from HPT to LPT without too much loss. Therefore, it becomes more and more urgent to master the technique of designing aggressive, even super-aggressive ITD. Much more concerns have been concentrated on the duct. However, in order to further improve turbine, LPT nozzle is arranged into ITD to shorten low pressure axle. With such design concept, it is obvious that LPT nozzle flow field is easily influenced by upstream duct structure, but receives much less interests on the contrary. In this paper, numerical method is used to investigate the effects of length of ITD with upstream swirl blades on LPT nozzle. Nine models with the same swirl and nozzle blades, while the length of ITD is the only parameter to be changed, will be discussed. Finally, several conclusions and advices for designers are summarized. After changing axial length of ducts, inlet and outlet flow field of nozzle differs, correspondingly. On the other hand, the shearing stress on nozzle blade(suction and pressure) surface presents individual feature under various inlet flow. In addition to that, "Clocking-like effect" is described in this paper, which will contribute much to the pressure loss and should be paid enough attention.
文摘BACKGROUND Sporadic cases of extranasopharyngeal angiofibroma in children,especially preschool children,have been reported in the literature.CASE SUMMARY We present a case of extranasopharyngeal angiofibroma in a 4-year-old boy.The presenting symptoms,imaging findings,treatment,histological appearance,and follow-up data are described in detail.For this patient,we performed embolization on two occasions,and then,resected the tumor completely.During the treatment,the patient developed a soft-palate perforation due to aseptic necrosis.However,the healing ability was good,and the perforation healed spontaneously.We additionally reviewed all pediatric cases of extranasopharyngeal angiofibroma published up to 30 June 2020 in the PubMed,Baidu Scholar,Scopus,and Web of Science databases.We identified 45 pediatric patients[average(10.98±4.86),boys 39(86.7%)].The highest proportion of cases occurred in adolescence[22(48.9%)].The top three sites of occurrence of extranasopharyngeal angiofibroma in children were the maxillary sinus,nasal septum,and inferior turbinate.CONCLUSION Extranasopharyngeal angiofibromas can occur throughout childhood,and predominantly present with nasal obstruction and spontaneous rhinorrhagia.
文摘A lot of study has been made for the design and defining hot end initial parameters of steem turbine of large thermal power plant at home and abroad. But little study has been performed for the reasonable selection of some cold end parameters of steam turbine. The steam turbine cold end parameters defined in actual engineering project are somewhat unreasonable frequently. This paper describes some opinions for selecting some of the steam turbine cold end parameters, especially that of the turbine design back pressure and low pressure cylinder last stage blade length based on the regional features of meteorological conditions in China in association with the optimization of thermal power plant circulating water system.
