This paper presents a phase-locking-loop-based (PLL-based) charge control scheme to enhance the c... more This paper presents a phase-locking-loop-based (PLL-based) charge control scheme to enhance the cross regulation (CR) performance of charge-controlled SIMO Buck DC-DC without freewheel period. By combining PLL structure with the traditional charge control scheme, each channel could be regulated by an independent charge control loop. Moreover, a gain-adapted charge pump (GACP) technique is applied for the stability in multi-load condition. The multi-loop stability and CR expressions are derivated to improve their relative performance. Experimental results show that the proposed scheme can achieve worstcase CR of 0.052mV/mA in 384mA load transient, and 0.038mV/mA CR in 150mA load transient with at least 43.2% improvement above the existing charge control schemes.
European Journal of Rhinology and Allergy (Eur J Rhinol Allergy) is an international, scientific,... more European Journal of Rhinology and Allergy (Eur J Rhinol Allergy) is an international, scientific, open access periodical published in accordance with independent, unbiased, and double-blinded peer-review principles. The journal is the official online-only publication of Turkish Rhinologic Society and published triannually in April, August, and December. The publication language of the journal is English. European Journal of Rhinology and Allergy aims to contribute to the international literature by publishing original clinical and experimental research articles, case reports, review articles, technical notes, and letters to the editor in the field of rhinology and allergy. The journal's target audience are, researchers, physicians and healthcare professionals who are interested or working in the field of rhinology and allergy.
AIM: The craniovertebral junction is a remarkable anatomical area with unique anatomical and func... more AIM: The craniovertebral junction is a remarkable anatomical area with unique anatomical and functional relationships, which present difficult challenges for surgeons. The traditional approach to addressing pathologies in this area is microscopic transoral resection with posterior fixation; however, endoscopic endonasal clivus and odontoid surgeries now currently gaining interest as alternative approaches. We reviewed our experience of using the endoscopic endonasal approach at our institution. MATERIAL and METHODS: We retrospectively evaluated 41 patients (21 male, 20 female; age range, 2-65 years) who underwent endoscopic endonasal procedures for craniovertebral junction pathologies between 2008 and 2017. RESULTS: Of the 41 patients, 27 had clivus lesions, 7 had odontoid lesions, 6 had basilar invagination, and 1 had rhinorrhea repair. Six patients underwent an additional posterior decompression/fusion either before or after the endonasal procedure. None of the patients required tracheostomy, and cerebrospinal fluid leakage was postoperatively detected in one patient. The patients' mean modified Rankin scale and visual analog scale scores were 3 and 4, respectively. The follow-up period ranged from 12 to 50 months. CONCLUSION: Although the microscopic transoral approach has been considered the gold standard for craniovertebral junction surgical management, endoscopic approaches are feasible, safe, and effective for addressing pathologies in this region, with developing technique and surgical experience.
Ludwig angina is an aggressively spreading phlegmon or cellulite affecting the mouth floor and su... more Ludwig angina is an aggressively spreading phlegmon or cellulite affecting the mouth floor and submandibular and sublingual tissues of the mouth. The disease is mostly seen in patients aged 20-50 years with abscess or gingivitis of lower teeth. Early diagnosis is very important because this is a life-threatening disease. A 55-year-old male patient with the complaints of high body temperature despite the usage of intravenous antibiotics, somnolence, increased difficulty in breathing, and swelling in the neck was diagnosed with Ludwig angina and abscess was urgently drained. Head-neck region abscess intervened by team work can cause less mortality and morbidity.
Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 2016
Postoperative nausea and vomiting (PONV) is a common problem that affects up to 30% of all surgic... more Postoperative nausea and vomiting (PONV) is a common problem that affects up to 30% of all surgical patients after general anaesthesia, which increases in sinonasal surgery due the very potent emetic effect of ingested blood that is swallowed during the procedures. Therefore, a hypo/oropharyngeal packing is commonly placed in an effort to prevent blood ingestion. The primary aim of this study was to compare the efficacy of 3 packing types in preventing PONV and to compare the results with patients who received no packing. The secondary aim was to compare the postoperative throat pain in all 4 groups. A prospective double-blind randomized controlled study. A university hospital. After Institutional Review Board approval and informed consent, 201 adult patients scheduled for sinonasal surgery were randomized to 4 groups to have dry packing (n = 52), packing soaked with water (n = 48), packing soaked with chlorhexidine gluconate and benzydamine hydrochloride (n = 51), or no packing (n ...
This study aimed to evaluate the prevalence of facial nerve canal dehiscence in tympanoplasty pat... more This study aimed to evaluate the prevalence of facial nerve canal dehiscence in tympanoplasty patients and its influence on the need for revision surgery and on hearing results and anatomical outcomes. Patients who underwent tympanoplasty with/without mastoidectomy at Ankara University Otolaryngology Department from 2006 through 2013 with a minimum follow-up period of 6 months were reviewed retrospectively in this original study. Patients were divided into those with and without cholesteatoma. Numbers and frequencies of dehiscence were recorded according to disease type, the need for revision surgery, and hearing results and anatomical outcomes. Study subjects included 206 patients, of whom 15 (7.3%) had dehiscence. The prevalence of dehiscence was significantly high in the patients with cholesteatoma (13/50 patients) compared with those without (2/156 patients). The dehiscence frequency was significantly high in cholesteatoma (42.8%), as well as overall (14.7%), revision-surgery patients. Hearing results (P < 0.05) and anatomical outcomes were better in patients without dehiscence. Dehiscence is more common in patients with than without cholesteatoma and negatively affects tympanoplasty outcomes, including hearing results, anatomical outcomes, and the need for revision surgery.
Kulak Burun Bogaz Ihtisas Dergisi Kbb Journal of Ear Nose and Throat, Feb 1, 2007
A 75-year-old female patient presented with hoarseness and foreign body sensation in the back of ... more A 75-year-old female patient presented with hoarseness and foreign body sensation in the back of her throat of one-month history. Direct laryngoscopy showed bilateral, yellow, hyperemic masses on the left false vocal fold and laryngeal ventricle. Both true vocal folds were mobile. Excisional biopsies of the right false vocal fold and ventricle showed extracellular, insoluble, fibrillar protein accumulation, consistent with amyloidosis. There was no evidence for neoplasm. Serum and urine electrophoreses were negative. The work-up for systemic amyloidosis and multiple myeloma were negative. Treatment was limited to surgical excision. No complications developed within a six-month follow-up period.
Isolated sphenoid sinus disease (ISSD) describes a wide spectrum of pathologies including inflamm... more Isolated sphenoid sinus disease (ISSD) describes a wide spectrum of pathologies including inflammatory, vascular, bony dysplastic, and neoplastic diseases. The aim of this study was to assess the frequency with which a neoplastic process was diagnosed in patients of ISSD and patient management strategies. A retrospective analysis was conducted for all ISSD patients who underwent surgery between January 2005 and January 2014 at a tertiary center. The clinical characteristics, radiologic studies, operative findings, endoscopic surgical techniques, pathology results, and treatment outcomes of the patients were analyzed. In all, 42 patients (31 women and 11 men) were included in the study. Histopathologic examinations revealed that 10 patients (23.4%) had neoplasms (8 benign and 2 malignant), 19 (45.2%) had mucocele, 7 (16.7%) had fungal disease, and 6 (14.3%) had meningoencephalocele and cerebrospinal fluid leakage. With the exception of 2 patients with plasmacytoma, complete removal of the lesions was achieved in all patients using transnasal or transethmoidal endoscopic approaches, and no local recurrences were observed during the mean follow-up period of 42 months. More than one fifth of the patients with ISSD were diagnosed with neoplasms. The results indicated that endonasal endoscopic approaches could effectively help manage patients with ISSD lesions, including those that were neoplastic. It is clear that precaution during preoperative planning is imperative to avoid unexpected situations and complications that may put surgeons in a difficult position during surgery.
IntroductionPostoperative pneumocephalus is an unexpected condition after endoscopic odontoidecto... more IntroductionPostoperative pneumocephalus is an unexpected condition after endoscopic odontoidectomy surgery.CaseWe present the first case of pneumocephalus after odontoidectomy in a pediatric patient. The clinical presentation, radiological findings, and surgical procedures are described with related pathophysiology.ConclusionWe outline the key for management of a rare intracranial air entrapment case after an endoscopic odontoidectomy surgery in a pediatric patient and the measures taken to prevent its occurrence in the future.
Laryngeal cysts are rare in adults; therefore, the majority of previous reports deal primarily wi... more Laryngeal cysts are rare in adults; therefore, the majority of previous reports deal primarily with laryngeal cysts in infants and children. Ductal cysts of the larynx arise from the submucous glands when the ducts of these glands are occluded. They are most commonly located in the vallecula. In this report, we present a rare cause of life-threatening stridor in adults, a large ductal cyst of the larynx that was removed via endoscopic CO(2) laser resection. On the basis of clinical observations during the postoperative period, we conclude that endoscopic CO(2) laser resection is a reliable and safe method for removing cysts of the larynx. It is also a cost-effective procedure that minimizes hospitalization time and the need for tracheotomy.
This paper presents a phase-locking-loop-based (PLL-based) charge control scheme to enhance the c... more This paper presents a phase-locking-loop-based (PLL-based) charge control scheme to enhance the cross regulation (CR) performance of charge-controlled SIMO Buck DC-DC without freewheel period. By combining PLL structure with the traditional charge control scheme, each channel could be regulated by an independent charge control loop. Moreover, a gain-adapted charge pump (GACP) technique is applied for the stability in multi-load condition. The multi-loop stability and CR expressions are derivated to improve their relative performance. Experimental results show that the proposed scheme can achieve worstcase CR of 0.052mV/mA in 384mA load transient, and 0.038mV/mA CR in 150mA load transient with at least 43.2% improvement above the existing charge control schemes.
European Journal of Rhinology and Allergy (Eur J Rhinol Allergy) is an international, scientific,... more European Journal of Rhinology and Allergy (Eur J Rhinol Allergy) is an international, scientific, open access periodical published in accordance with independent, unbiased, and double-blinded peer-review principles. The journal is the official online-only publication of Turkish Rhinologic Society and published triannually in April, August, and December. The publication language of the journal is English. European Journal of Rhinology and Allergy aims to contribute to the international literature by publishing original clinical and experimental research articles, case reports, review articles, technical notes, and letters to the editor in the field of rhinology and allergy. The journal's target audience are, researchers, physicians and healthcare professionals who are interested or working in the field of rhinology and allergy.
AIM: The craniovertebral junction is a remarkable anatomical area with unique anatomical and func... more AIM: The craniovertebral junction is a remarkable anatomical area with unique anatomical and functional relationships, which present difficult challenges for surgeons. The traditional approach to addressing pathologies in this area is microscopic transoral resection with posterior fixation; however, endoscopic endonasal clivus and odontoid surgeries now currently gaining interest as alternative approaches. We reviewed our experience of using the endoscopic endonasal approach at our institution. MATERIAL and METHODS: We retrospectively evaluated 41 patients (21 male, 20 female; age range, 2-65 years) who underwent endoscopic endonasal procedures for craniovertebral junction pathologies between 2008 and 2017. RESULTS: Of the 41 patients, 27 had clivus lesions, 7 had odontoid lesions, 6 had basilar invagination, and 1 had rhinorrhea repair. Six patients underwent an additional posterior decompression/fusion either before or after the endonasal procedure. None of the patients required tracheostomy, and cerebrospinal fluid leakage was postoperatively detected in one patient. The patients' mean modified Rankin scale and visual analog scale scores were 3 and 4, respectively. The follow-up period ranged from 12 to 50 months. CONCLUSION: Although the microscopic transoral approach has been considered the gold standard for craniovertebral junction surgical management, endoscopic approaches are feasible, safe, and effective for addressing pathologies in this region, with developing technique and surgical experience.
Ludwig angina is an aggressively spreading phlegmon or cellulite affecting the mouth floor and su... more Ludwig angina is an aggressively spreading phlegmon or cellulite affecting the mouth floor and submandibular and sublingual tissues of the mouth. The disease is mostly seen in patients aged 20-50 years with abscess or gingivitis of lower teeth. Early diagnosis is very important because this is a life-threatening disease. A 55-year-old male patient with the complaints of high body temperature despite the usage of intravenous antibiotics, somnolence, increased difficulty in breathing, and swelling in the neck was diagnosed with Ludwig angina and abscess was urgently drained. Head-neck region abscess intervened by team work can cause less mortality and morbidity.
Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 2016
Postoperative nausea and vomiting (PONV) is a common problem that affects up to 30% of all surgic... more Postoperative nausea and vomiting (PONV) is a common problem that affects up to 30% of all surgical patients after general anaesthesia, which increases in sinonasal surgery due the very potent emetic effect of ingested blood that is swallowed during the procedures. Therefore, a hypo/oropharyngeal packing is commonly placed in an effort to prevent blood ingestion. The primary aim of this study was to compare the efficacy of 3 packing types in preventing PONV and to compare the results with patients who received no packing. The secondary aim was to compare the postoperative throat pain in all 4 groups. A prospective double-blind randomized controlled study. A university hospital. After Institutional Review Board approval and informed consent, 201 adult patients scheduled for sinonasal surgery were randomized to 4 groups to have dry packing (n = 52), packing soaked with water (n = 48), packing soaked with chlorhexidine gluconate and benzydamine hydrochloride (n = 51), or no packing (n ...
This study aimed to evaluate the prevalence of facial nerve canal dehiscence in tympanoplasty pat... more This study aimed to evaluate the prevalence of facial nerve canal dehiscence in tympanoplasty patients and its influence on the need for revision surgery and on hearing results and anatomical outcomes. Patients who underwent tympanoplasty with/without mastoidectomy at Ankara University Otolaryngology Department from 2006 through 2013 with a minimum follow-up period of 6 months were reviewed retrospectively in this original study. Patients were divided into those with and without cholesteatoma. Numbers and frequencies of dehiscence were recorded according to disease type, the need for revision surgery, and hearing results and anatomical outcomes. Study subjects included 206 patients, of whom 15 (7.3%) had dehiscence. The prevalence of dehiscence was significantly high in the patients with cholesteatoma (13/50 patients) compared with those without (2/156 patients). The dehiscence frequency was significantly high in cholesteatoma (42.8%), as well as overall (14.7%), revision-surgery patients. Hearing results (P < 0.05) and anatomical outcomes were better in patients without dehiscence. Dehiscence is more common in patients with than without cholesteatoma and negatively affects tympanoplasty outcomes, including hearing results, anatomical outcomes, and the need for revision surgery.
Kulak Burun Bogaz Ihtisas Dergisi Kbb Journal of Ear Nose and Throat, Feb 1, 2007
A 75-year-old female patient presented with hoarseness and foreign body sensation in the back of ... more A 75-year-old female patient presented with hoarseness and foreign body sensation in the back of her throat of one-month history. Direct laryngoscopy showed bilateral, yellow, hyperemic masses on the left false vocal fold and laryngeal ventricle. Both true vocal folds were mobile. Excisional biopsies of the right false vocal fold and ventricle showed extracellular, insoluble, fibrillar protein accumulation, consistent with amyloidosis. There was no evidence for neoplasm. Serum and urine electrophoreses were negative. The work-up for systemic amyloidosis and multiple myeloma were negative. Treatment was limited to surgical excision. No complications developed within a six-month follow-up period.
Isolated sphenoid sinus disease (ISSD) describes a wide spectrum of pathologies including inflamm... more Isolated sphenoid sinus disease (ISSD) describes a wide spectrum of pathologies including inflammatory, vascular, bony dysplastic, and neoplastic diseases. The aim of this study was to assess the frequency with which a neoplastic process was diagnosed in patients of ISSD and patient management strategies. A retrospective analysis was conducted for all ISSD patients who underwent surgery between January 2005 and January 2014 at a tertiary center. The clinical characteristics, radiologic studies, operative findings, endoscopic surgical techniques, pathology results, and treatment outcomes of the patients were analyzed. In all, 42 patients (31 women and 11 men) were included in the study. Histopathologic examinations revealed that 10 patients (23.4%) had neoplasms (8 benign and 2 malignant), 19 (45.2%) had mucocele, 7 (16.7%) had fungal disease, and 6 (14.3%) had meningoencephalocele and cerebrospinal fluid leakage. With the exception of 2 patients with plasmacytoma, complete removal of the lesions was achieved in all patients using transnasal or transethmoidal endoscopic approaches, and no local recurrences were observed during the mean follow-up period of 42 months. More than one fifth of the patients with ISSD were diagnosed with neoplasms. The results indicated that endonasal endoscopic approaches could effectively help manage patients with ISSD lesions, including those that were neoplastic. It is clear that precaution during preoperative planning is imperative to avoid unexpected situations and complications that may put surgeons in a difficult position during surgery.
IntroductionPostoperative pneumocephalus is an unexpected condition after endoscopic odontoidecto... more IntroductionPostoperative pneumocephalus is an unexpected condition after endoscopic odontoidectomy surgery.CaseWe present the first case of pneumocephalus after odontoidectomy in a pediatric patient. The clinical presentation, radiological findings, and surgical procedures are described with related pathophysiology.ConclusionWe outline the key for management of a rare intracranial air entrapment case after an endoscopic odontoidectomy surgery in a pediatric patient and the measures taken to prevent its occurrence in the future.
Laryngeal cysts are rare in adults; therefore, the majority of previous reports deal primarily wi... more Laryngeal cysts are rare in adults; therefore, the majority of previous reports deal primarily with laryngeal cysts in infants and children. Ductal cysts of the larynx arise from the submucous glands when the ducts of these glands are occluded. They are most commonly located in the vallecula. In this report, we present a rare cause of life-threatening stridor in adults, a large ductal cyst of the larynx that was removed via endoscopic CO(2) laser resection. On the basis of clinical observations during the postoperative period, we conclude that endoscopic CO(2) laser resection is a reliable and safe method for removing cysts of the larynx. It is also a cost-effective procedure that minimizes hospitalization time and the need for tracheotomy.
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Papers by Suha Beton