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Biomedical subjects

J M Converse

Publications and source records attributed to J M Converse.

At least 19 recordsLinked to original sources
PubMed1983

Stereomicroscopy as a diagnostic aid in evaluating the viability of island flaps: an experimental study.

This study entailed direct stereomicroscopic observations of rat abdominal island flaps and the sequence of vascular events that occurred during and after occlusion by clamping of the individual femoral vessels for varying time intervals of up to 16 hours. The vascular changes and the status of the circulation in the flap vasculature, including the timing of complete hemal stasis and resumption of flow, following the application and subsequent release of the vessel clamp were observed and correlated with flap viability and behavior. This study also included a grading system of the vascular changes observed under a stereomicroscope. From these findings, it is suggested that in vivo stereomicroscopy may serve as a new and simple clinical tool for the early diagnosis of thrombosis at the site of microvascular anastomosis of a free flap transfer and may define time limits during which the anastomosis can be successfully corrected and the flap salvaged.

Animals↗
PubMed1982

Critical closing pressure, local perfusion pressure, and the failing skin flap.

A simple apparatus was devised to perfuse the rat groin flap to study the relationship between perfusion pressure and flow. Results demonstrate that a relatively high intraarterial pressure must be applied to this skin flap before blood flow will commence. Results suggest that this critical closing phenomenon is the result of surface tension, blood rheology, venous pressure, tissue pressure, and vascular smooth muscle tone. Correlating the experiments of Milton and Landis reveals that, beyond a certain distance, local perfusion pressure in a skin flap gradually decreases with increasing distance from the flap base. These observations suggest that the perfusion boundary in a skin flap forms at the point where perfusion pressure has fallen to the level of the critical closing pressure. Methods of increasing survival length of a flap by decreasing critical closing pressure are discussed. The effects of edema and pressure dressings on flap and replant survival are examined in terms of the closing pressure concept.

Animals↗
PubMed1982

Resection of a giant ossifying fibroma through an intraoral approach in a 9-year-old child: immediate reconstruction and 6-year cephalometric follow-up.

An unusual opportunity was afforded to study the growth and development of the facial structures of a 9-year-old child who underwent major mandibular reconstruction. The longitudinal studies confirmed the present concepts of the factors responsible for mandibular growth as well as their repercussions on other facial structures. An intraoral subperiosteal resection of a major portion of the right hemimandible sparing the upper part of the mandibular ramus was required to eradicate a large ossifying fibroma. An iliac bone graft consisting of the outer table of cortical bone and cancellous bone was placed within the mucoperiosteal sac to repair the defect. It also was used to control the ramus remnant. The patient was followed for 6 years. The growth of the reconstructed mandible was in effect nearly symmetrical with the unaffected contralateral portion of the mandible, resulting in minimal facial asymmetry. The mucoperiosteum provided a vascular bed for the bone graft and the buccal sulcus was preserved, thus providing a retentive ridge and sulcus for a denture without the need to perform a skin or mucosal graft inlay procedure. The symmetrical growth of the mandible is attributed to the growth of the ramus by remodeling, resorption, deposition, and relocation and by the muscle-bone interface (the functional matrix).

Bone Transplantation↗
PubMed1980

Early and late surgery in craniofacial dysostosis: a longitudinal cephalometric study.

Longitudinal clinical and cephalometric case studies are presented for two groups of patients with craniofacial dysostosis. The first sample includes two infants who underwent an extensive stripping procedure that was extended inferiorly to involve not only the coronal, but also the sphenozygomatic suture. The second sample includes two adolescents with midfacial hypoplasia who underwent a fronto-orbital-maxillary advancement. The extensive cranial stripping procedure had a favourable impact upon growth and development of the craniofacial structures, and longitudinal studies suggest the importance of promoting the growth potential of the bones contiguous to the affected sutures. Craniofacial surgery performed on adolescents results in a dramatic translocation of the skeletal and soft-tissue structures of the face. In contrast to early surgical intervention in infants in whom growth of the effected areas essential to the development of face and cranium was crucial, late surgery appeared to have little, if any, impact upon the development of the craniofacial skeletal structures that had been operated on.

Adolescent↗
PubMed1979

Conservation of major leg arteries when used as recipient supply for a free flap.

The potential hazards of using proximal segments of leg arteries for end-to-end anastomosis to vessels in free flaps are examined, and alternatives are proposed. The convservation of the major tibial arteries seems highly desirable, to minimize any subsequent development of ischemic complications. Turning a free flap upside down moves the anastomosis to the distal part of the extremity, thus conserving most of the muscular branches of the recipient artery. Cutting the recipient artery distally and bending it back in recurrent fashion also allows for easy end-to-end anastomosis, with many technical advantages.

Adult↗
PubMed1978

Surgical correction of the facial deformities of acromegaly.

The neurosurgical treatment of acromegaly is well established, but little has been written about correction of the facial deformities of this disease. Although hypertrophy of the skin and subcutaneous tissues may decrease after successful treatment of the pituitary tumor, there is no reversal of the bony changes. An acromegalic patient is presented whose facial deformities were repaired in stages by mandibular osteotomy and soft tissue excision. The history and pathology of acromegaly are reviewed.

Acromegaly↗