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Biomedical subjects

G G Snyder

Publications and source records attributed to G G Snyder.

At least 19 recordsLinked to original sources
PubMed1980

Evaluation of insulating materials used during cryosurgery.

During the performance of cryosurgery it is of paramount importance to protect surrounding normal tissue from injury during the freezing process. This study evaluates three different insulating materials that are commonly used: petrolatum gauze, wooden tongue depressors, and styrofoam. To measure the effectiveness of these different insulators, the temperature gradient that developed across these barriers during a freezing cycle was measured. Five separate trials were carried out with each of the insulators, and the grafts demonstrated the results of these experimental trails. The superior insulator was styrofoam. Significant protection was afforded by wood and little protection by the layers of petrolatum gauze. In spite of the similarity in protection offered by the styrofoam and wood insulators, styrofoam is superior because of its flexibility. Our studies indicate that styrofoam is the best and most practical insulator to use during cryosurgical procedures in the head and neck area.

Bandages↗
PubMed1979

Technique for construction of facial moulage.

A technique for fabrication of a facial moulage is described which is both simple and useful in preoperative evaluation for selected facial plastic-reconstructive procedures. There are many alternative methods and materials that could be used; the one described here is the one which best suits our needs. These techniques have been used by many people for many years and no claim is being made for any innovation in this regard. However, a simple, clear, step by step explanation of this technique is described.

Face↗
PubMed1979

The effect of static tympanic pressure gradients on hearing sensitivity in normal subjects.

The effects of static tympanic air pressure gradients on hearing sensitivity was studied by introducing overpressures of 100 mm H2O to 400 mm H2O into the ear canals of 22 normal subjects. Sweep frequency threshold measures were obtained using a pressure-tight probe transducer driven by a Bekesy automatic audiometer. These gradients of tympanic pressure disequilibrium produced threshold losses through 4000 Hz, most prominently for the region of 500 to 1000 Hz, that increased systematically with the degree of overpressure. The data may be useful in estimating the degree of conductive loss associated with middle ears presenting retraction without effusion and normally compliant though negatively skewed tympanograms.

Acoustic Impedance Tests↗
PubMed1979

Spastic dysphonia: treatment by selective section of the recurrent laryngeal nerve.

Selective section of the adductor branch of the recurrent laryngeal nerve appears to result in phonatory results similar to complete nerve section without the inherent morbidity. The abductor branch to the posterior cricoid-arytenoid muscle remains intact for glottic opening during inspiration. We emphasize the importance of careful preoperative patient evaluation as described by Dedo. All patients should be seen by a speech therapist and undergo a trial of speech therapy prior to surgical evaluation. A test block of the recurrent nerve with 1% xylocaine is imperative to allow the patient to hear the postoperative speech characteristics and give him a realistic expectation of the surgical result. We find that patients and referring professionals more readily accept the concept of selective nerve section.

Humans↗
PubMed1978

Management of tracheocutaneous fistula.

In our experience, recommended treatment of the closure of tracheocutaneous fistula has been disappointing. Complications associated with primary closure, which we have experienced, include pneumomediastinum, pneumothorax, and wound breakdown. The alternate method of treating tracheocutaneous fistula, which we recommend, consists of excision of the tract down to the level of the trachea and allowing healing to take place via secondary intention. Elective scar revision, if indicated, is scheduled at some time in the future.

Child↗
PubMed1978

Juvenile ossifying fibroma: an ultrastructural study.

The ultrastructural features of a juvenile ossifying fibroma of the maxilla are described. The stromal portion of the tumor was composed of osteoblasts and to a lesser extent of fibroblasts. The bone spicules were rimmed by osteoblasts and osteoclasts. Calcification was seen to occur along the collagen fiber matrix, corresponding to calcification of osteoid, and also in the form of intracellular and extracellular crystallization. The latter form of calcification corresponded to so-called psammoma-like bodies, and was considered characteristic of this subtype of ossifying fibroma.

Bone Neoplasms↗
PubMed1977

Bridge method of skin-flap delay.

Necrosis, a catastrophic complication of skin-falp use, is due to inadequate capillary blood flow. Delay procedures, which are based on newer information regarding skin vasculature and delay dynamics, can augment surviving-flap length. A delay procedure that used multiple skin bridges was studied in 121 flaps in 21 pigs. The result was a considerably greater amount of length augmentation than has previously been reported. This enhanced effect is related to a combination of nearly maximal sympathectomy in a highly ischemic, surgically defined experimental flap.

Animals↗
PubMed1977

Facial plexiform neurofibroma.

Facial plexiform neurofibroma is a relatively rare manifestation of Von Recklinghausen's neurofibromatosis. Two patients with extensive facial tumor involvement are presented, each having undergone wide local resection after multiple previous local excisions had failed to control the tumor and its locally deforming and destructive effects. A discussion of the problem, its etiology, pathogenesis, natural history, prognosis and suggested treatment is presented.

Adolescent↗
PubMed1976

Cryosurgery of supraglottic cavernous hemangioma.

Cryosurgery is gaining more and more importance as a therapeutic modality within the field of head and neck surgery. It has been used effectively in the treatment of cavernous hemangiomas of the skin and oral cavity. Supraglottic vanernous hemangiomas present a challenge in management when surgical intervention is indicated. The results of cryosurgery in the treatment of such a lesion are reported.

Adult↗
PubMed1976

Some factors involved in the skin flap delay phenomenon.

The use of skin flaps for reconstruction following extensive ablative surgery in the head and neck area has played a major role on the improvement of the results being attained. Using the pig as an experimental animal various factors of flap orientation, skin incisions and flap undermining were investigated. Results confirmed the ineffectiveness of incision alone as a delay maneurver and suggested that anatomical orientation of cutaneous skin flaps was not of crucial significance. The complete mechanism of the positive effects of delay remains undefined.

Animals↗