NIVALDO ALONSO
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Cirurgia, Faculdade de Medicina - Docente
Instituto Central, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina - Líder
Instituto Central, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina - Líder
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- Orbit, zygoma, and maxilla growth patterns in Crouzon syndrome(2019) LU, X.; FORTE, A. J.; SAWH-MARTINEZ, R.; WU, R.; CABREJO, R.; STEINBACHER, D. M.; ALPEROVICH, M.; ALONSO, N.; PERSING, J. A.The facial malformations of Crouzon syndrome involve the entire cranioorbito-zygomatic region. The detailed sequence of changes in orbit, zygoma, and maxilla over time, the mutual influence among these three anatomical structures, and their relationship with the cranial base were studied to determine the sequence and timing of deformity. Preoperative CT scans of 36 patients with Crouzon syndrome (mean age 10.84 +/- 14.70 years; 14 male, 22 female) and CT scans of 54 control subjects (mean age 8.53 +/- 13.22 years; 29 male, 25 female) were divided into five subgroups by age: 0-6 months, 6 months-2 years, 2-6 years, 6-18 years, and 18-62 years. Craniofacial morphometric cephalometrics were analyzed using Materialise software. Crouzon orbit anteroposterior length was shorter before 6 months (P = 0.021) and remained shorter into adulthood (P < 0.001). Globe projection was greater across all age subgroups (P < 0.001), reaching a peak at 6 months to 2 years (P < 0.001). The increased medial orbital width was the most remarkable and persistent secondary deformity (P < 0.001). The zygoma anterior protrusion was retruded before 6 months of age (P < 0.001), but then improved gradually. The width of maxilla was greater by 24% in the Crouzon cohort (P < 0.001), with a difference of 16% before 6 months (P = 0.024), and was developed earlier than the shortened anteroposterior length. Crouzon high and shallow orbital walls are distinctive. Maxillary widening developed before the malformation of sphenoid. The anteroposterior position of zygoma is likely a principal deformity, rather than a reflection of the intrinsic shape of the bone.
- Patient-Perceived Barriers to Accessing Cleft Care at a Tertiary Referral Center in Sao Paulo, Brazil(2019) ISE, Ananda; MENEZES, Camila; NETO, Joao Batista; SALUJA, Saurab; AMUNDSON, Julia R.; JENNY, Hillary; MASSENBURG, Ben; CITRON, Isabelle; ALONSO, NivaldoBackground: In low- and middle-income countries, poor access to care can result in delayed surgical repair of orofacial clefts leading to poor functional outcomes. Even in Brazil, an upper middle-income country with free comprehensive cleft care, delayed repair of orofacial clefts commonly occurs. This study aims to assess patient-perceived barriers to cleft care at a referral center in Sao Paulo. Methods: A 29-item questionnaire assessing the barriers to care was administered to 101 consecutive patients (or their guardians) undergoing orofacial cleft surgery in the Plastic Surgery Department in Hospital das Clinicas, in Sao Paulo, Brazil, between February 2016 and January 2017. Results: A total of 54.4% of patients had their first surgery beyond the recommended time frame of 6 months for a cleft lip or cleft lip and palate and 18 months for a cleft palate. There was a greater proportion of isolated cleft palates in the delayed group (66.7% vs 33.3%). Almost all patients had a timely diagnosis, but delays occurred from diagnosis to repair. The mean number of barriers reported for each patient was 3.8. The most frequently cited barriers related to lack of access to care include (1) lack of hospitals available to perform the surgery (54%) and (2) lack of availability of doctors (51%). Conclusion: Delays from diagnosis to treatment result in patients receiving delayed primary repairs. The commonest patient-perceived barriers are related to a lack of access to cleft care, which may represent a lack of awareness of available services.
- Enlarged anterior cranial fossa and restricted posterior cranial fossa, the disproportionate growth of basicranium in Crouzon syndrome(2019) LU, Xiaona; FORTE, Antonio Jorge; STEINBACHER, Derek M.; ALPEROVICH, Michael; ALONSO, Nivaldo; PERSING, John A.Crouzon syndrome patients develop normal intracranial volume and potential restricted posterior cranial fossa volume with growth. This study aims to trace the segmental anterior, middle and posterior cranial fossae volume, and structural morphology in these patients, in order to help discern more focused and individualized surgical treatment plan. Ninety-two preoperative CT scans (Crouzon, n = 36; control, n = 56) were included, and divided into 5 age related subgroups. CT scans were measured using Mimics and 3-matics software. Overall, Crouzon syndrome patients grew to a 27% (p = 0.011) increased anterior cranial fossa volume and a 20% (p = 0.001) decreased posterior cranial fossa volume, with normal middle cranial fossa and entire intracranial volume measurement. The posterior cranial fossa of Crouzon syndrome initially developed significantly reduced volume (19%, p = 0.032), compared to normals, from 6 months of age, and remained reduced thereafter. The 7.63 mm shortening of posterior cranial fossa length contributed most to the shortened entire cranial length (9.30 mm, p = 0.046). Although the entire cranial volume of Crouzon syndrome is normal overall, the segmental anterior, middle and posterior cranial fossae developed disproportionately. The early significant and lifelong restricted posterior cranial fossa addresses the importance of early posterior cranial expansion. Ideally expansion would have vectors in all three dimensions. (C) 2019 Published by Elsevier Ltd on behalf of European Association for Cranio-Maxillo-Facial Surgery.