Embedded filter bank-based algorithm for ECG compression

In this work, two ECG compression schemes are presented using two types of filter banks to decompose the incoming signal: wavelet packets (WP) and nearly-perfect reconstruction cosine modulated filter banks. The conventional embedded zerotree wavelet (EZW) algorithm takes advantage of the hierarchical relationship among subband coefficients of the pyramidal wavelet decomposition. Nevertheless, it performs worse when used with WP as the hierarchy becomes more complex. In order to address this problem, we propose a new technique that considers no relationship among coefficients, and is therefore suitable for use with WP. Furthermore, this new approximation makes it possible to apply the quantization method toM-channel maximally decimated filter banks. In this fashion, the proposed algorithm provides two efficient and effective ECG compressors that show better ECG compression performance than the conventional EZW algorithm

Surgical treatment of non-embolized patients with nasoangiofibroma

Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2016-07-14T13:50:02Z No. of bitstreams: 1 Fonseca, Adriano Santana et al. Surgical treatment....pdf: 157428 bytes, checksum: 7fa670b5fafd191777a2f404b666bbf5 (MD5)Approved for entry into archive by Ana Maria Fiscina Sampaio ([email protected]) on 2016-07-14T14:05:00Z (GMT) No. of bitstreams: 1 Fonseca, Adriano Santana et al. Surgical treatment....pdf: 157428 bytes, checksum: 7fa670b5fafd191777a2f404b666bbf5 (MD5)Made available in DSpace on 2016-07-14T14:05:00Z (GMT). No. of bitstreams: 1 Fonseca, Adriano Santana et al. Surgical treatment....pdf: 157428 bytes, checksum: 7fa670b5fafd191777a2f404b666bbf5 (MD5) Previous issue date: 2008Hospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Salvador, BA, Brasil / Hospital da Bahia. Núcleo de Otorrinolaringologia e Estudos da Voz. Salvador, BA, Brasil / Hospital Português. Salvador, BA, BrasilHospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Salvador, BA, BrasilFundação Gonçalo Moniz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Hospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Salvador, BA, BrasilHospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Head and Neck Department. Salvador, BA, BrasilHospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Head and Neck Department. Salvador, BA, BrasilHospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Head and Neck Department. Salvador, BA, BrasilHospital Santa Izabel. Santa Casa de Misericórdia da Bahia. Head and Neck Department. Salvador, BA, BrasilJuvenile nasopharyngeal angiofibroma (JNA) is an uncommon tumor of the sphenopalatine foramen. Surgery combined with preoperative embolization has been the treatment of choice for JNA patients without intracranial invasion. This study aims to assess the viability of surgically treating non-embolized patients with JNA (types I-III according to Fisch). Materials And Method: This is a retrospective, descriptive study based on the medical records of 15 patients with histologically confirmed JNA (Fisch’s types I- III), who underwent surgical treatment without pre-op embolization in our institution between 2000 and 2005. Results: Seven of the fifteen patients were approached endoscopically, four through the transantral approach, three were treated with the combined transmaxillary and endoscopic approach, and one with the combined transmaxillary and transpalatal approach. Six patients required intraoperatory blood transfusion, averaging volumes of 1.3 unit/patient. There were no cases of death or significant morbidity. Eleven of the fifteen patients were followed for an average of twelve months and 27% of them relapsed. Four patients did not comply with the follow-up scheme. Conclusion: Resection of JNF types I-III was safely completed in non-embolized patients. The observed levels of intraoperative bleeding, occurrence of complications, and rates of recurrence were close to those seen in embolized patients as found in the literature

Quasiconformal mappings and sharp estimates for the distance to L^\infty in some function spaces

We provide several estimates which involve the distance to L∞ in some function spaces, the composition operator induced by a quasiconformal mapping and the logarithm of the Jacobian of a quasiconformal mapping. Our results are sharp in the two dimensional case

Tratamento cirúrgico de nasoangiofibroma sem embolização Surgical Treatment of Non-embolized Patients with Nasoangiofibroma

Nasoangiofibroma juvenil (NAFJ) é um tumor incomum que se localiza na região do forame esfenopalatino. A cirurgia combinada à embolização pré-operatória tem sido a opção terapêutica mais empregada nos pacientes com NAFJ sem invasão intracraniana. O objetivo desse estudo é avaliar a viabilidade do tratamento cirúrgico do nasoangiofibroma em pacientes estágios I- III de Fisch, sem uso de embolização pré- operatória. MATERIAL E MÉTODO: Estudo descritivo, retrospectivo, utilizando-se dados de revisão de prontuário de quinze pacientes com NAFJ estágio I a III de Fisch submetidos à cirurgia sem embolização pré-operatória, entre os anos de 2000 e 2005. RESULTADOS: Dos quinze pacientes, sete pacientes foram submetidos à cirurgia endoscópica, quatro via transmaxilar, três via endoscópica e transmaxilar e um via transmaxilar e transpalatina. Seis pacientes necessitaram de hemotransfusão no intra-operatório, com média geral de 1.3 bolsa/paciente. Nenhum caso de mortalidade ou morbidade significativa foi registrado. Onze dos quinze pacientes foram acompanhados por tempo médio de doze meses com taxa de recidiva de 27%. Quatro pacientes perderam seguimento. CONLUSÃO: A ressecção de NAFJ classes I- III foi realizada com segurança em pacientes não-embolizados, com taxa de sangramento intraoperatório, ocorrência de complicações e taxa de recorrência próximas dos valores pesquisados na literatura para pacientes embolizados.<br>Juvenile nasopharyngeal angiofibroma (JNA) is an uncommon tumor of the sphenopalatine foramen. Surgery combined with preoperative embolization has been the treatment of choice for JNA patients without intracranial invasion. This study aims to assess the viability of surgically treating non-embolized patients with JNA (types I-III according to Fisch). MATERIAL AND METHOD: This is a retrospective, descriptive study based on the medical records of 15 patients with histologically confirmed JNA (Fisch’s types I- III), who underwent surgical treatment without pre-op embolization in our institution between 2000 and 2005. RESULTS: Seven of the fifteen patients were approached endoscopically, four through the transantral approach, three were treated with the combined transmaxillary and endoscopic approach, and one with the combined transmaxillary and transpalatal approach. Six patients required intraoperatory blood transfusion, averaging volumes of 1.3 unit/patient. There were no cases of death or significant morbidity. Eleven of the fifteen patients were followed for an average of twelve months and 27% of them relapsed. Four patients did not comply with the follow-up scheme. CONCLUSION: Resection of JNF types I-III was safely completed in non-embolized patients. The observed levels of intraoperative bleeding, occurrence of complications, and rates of recurrence were close to those seen in embolized patients as found in the literature