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Biomedical subjects

W J Kane

Publications and source records attributed to W J Kane.

At least 19 recordsLinked to original sources
PubMed1997

Treatment outcome for 424 primary cases of clinical I cutaneous malignant melanoma of the head and neck.

BACKGROUND: Cutaneous malignant melanoma (CMM) is increasing in frequency. Surgery remains the primary and only curative treatment method. Our aim was to define prognostic factors and outcome predictors for patients with clinical stage I CMM of the head and neck. METHODS: Surgical treatment and outcome was analyzed for 424 patients with clinical stage I melanoma of the head and neck, completing initial treatment at the Mayo Clinic (1970-1990). The data were analyzed using the Kaplan-Meier product-limit method and Cox multiple-regression models. RESULTS: Overall, 180 (42%) patients underwent elective lymph node dissection (ELND) as part of the initial treatment; occult disease was demonstrated in 15 (8.3%). Among patients with tumor > 1.5 mm thick, occult regional disease was found in 15%. Failure of final treatment occurred in 152 (36%). Overall, 82% and 75% of the patients survived 5 and 10 years, respectively. CONCLUSIONS: Tumor thickness, extent of invasion, and the presence of occult region metastatic disease were the only independently predictive value (p < .005) of recurrence. The detection of disease by ELND did not appear to protect the patient from disease progression but identified those with regionally advanced disease and highest risk for recurrence. The development of recurrence significantly reduced but did not eliminate the potential for extended disease-free survival with subsequent treatment.

Adolescent↗
PubMed1996

Enhanced bone graft contouring for mandibular reconstruction using intraoperatively fashioned templates.

Among the challenges created by reconstruction of mandibular defects using free vascularized bone flaps is sizing and contouring of the bone graft in accordance with the dimensions of the defect. We have developed a rapid and reliable method for constructing a postablative template of the defect using a rapid-setting splint material called Aquaplast. The template can then be used at a site remote from the head and neck as a precise model of the defect for optimal size and shape estimation during bone graft sculpting and fixation. The material also has postablative utility for estimation of internal lining requirements and soft-tissue replacements during osteomusculocutaneous or fasciocutaneous flap planning. We feel that the use of Aquaplast has greatly enhanced our three-dimensional appreciation of mandibular bone defects and enhanced the final aesthetic and functional results in our patients undergoing mandibular reconstruction.

Humans↗
PubMed1996

The uremic gangrene syndrome: improved healing in spontaneously forming wounds following subtotal parathyroidectomy.

Patients with end-stage renal disease often demonstrate retarded healing of surgical wounds, but the basis for spontaneous wound formation in these patients is less well understood. We report our experience with four patients with a unique clinical entity previously described as the uremic gangrene syndrome (also known as calciphylaxis) that involves spontaneously forming and insidiously progressive wounds of the skin and soft tissue in uremic patients with hyperparathyroidism. The importance of recognizing this phenomenon relates to the potential benefit to wound-healing efforts resulting from subtotal parathyroidectomy and adjustment of serum calcium and phosphate levels when severe hyperparathyroidism is present. Disrupted parathyroid homeostasis as a mechanism for soft-tissue ischemia and subsequent infarction is supported by wound biopsies demonstrating microarterial calcification. As experts in factors resulting in refractory wounds, plastic surgeons need be aware of this peculiar vulnerability for spontaneously forming wounds in uremic patients. Clinical and laboratory findings, success with wound treatment in four patients, and currently popular pathophysiologic mechanisms are discussed.

Adult↗
PubMed1995

Significant hemangiomas and vascular malformations of the head and neck: clinical management and treatment outcomes.

The treatment dilemmas and our institutional experience with head and neck hemangiomas and vascular malformations are reviewed. Fifty-eight patients (38 with hemangiomas, 20 with vascular malformations) aged from newborn to 78 years were treated from 1975 to 1993. Eighty-seven percent of patients provided up-to-date follow-up, yielding a median follow-up interval of 7.18 years from intervention. Only significantly sized tumors (minimum diameter > 4 cm) were studied. Sodium tetradecyl sulfate sclerotherapy (SDS) was a sole therapy in 12 patients (all with hemangiomas) and was used in combination with surgical ablation in 22 patients (16 with hemangiomas, 6 with vascular malformations). The minority of tumors from both categories were completely removed with ablative surgery (six hemangiomas [23%], eight vascular malformations [44%]). Significantly debilitating tumor postsurgical recurrence, which led to mortality in some patients, was unique to vascular malformations with high flow on the basis of increased arterial to venous shunting. Less alarming but significant functional and cosmetic challenges are created in primarily postadolescent patients with incompletely involuted hemangiomas and low-flow vascular malformations of the head and neck. We have had a favorable experience with the combined application of sclerotherapy and conservative ablative surgery in this group. Patient survey implied satisfaction with treatment in the majority: Nine indicated they benefited significantly (17%); 37 indicated they were generally improved (71%); and 6 stated they did not benefit (12%). Tumor-specific philosophy on ablative therapy, recurrence patterns, and associated complications are presented.

Adolescent↗
PubMed1993

The effect of tissue expansion on the random flap viability and wound tensile strength of previously irradiated rabbit skin.

Tissue expansion facilitates coverage of cutaneous defects both through the generation of additional skin surface area and by increasing random flap length/width viability factors. The opportunity to apply tissue expansion techniques to head and neck defects within previously irradiated skin fields continues to increase. To study the effect of tissue expansion on the cutaneous perfusion and wound-healing capacity of irradiation-damaged skin, rabbit scalps were subjected to 5 weeks of fractionated radiation followed at 4 months by prolonged tissue expansion. Standardized random flaps were then created and reset within the expanded skin and analyzed in parallel with nonirradiated and nonexpanded control animals. Flap viability as expressed by area and mean maximum length was determined at 10 days postwounding followed by determination of wound-breaking strength. Irradiated tissues demonstrated a significantly reduced flap viability that was significantly increased by expansion. However, tissue expansion-related increases in flap length exceeded those expressed as percent of total area surviving for irradiated animals. Tissue expansion resulted in significant increases in wound tensile strength only in nonirradiated animals. These findings suggest that, compared with controls, several of the benefits of tissue expansion are less appreciable in radiation-damaged skin.

Analysis of Variance↗
PubMed1993

Diet and exercise and gemfibrozil therapy for the management of dyslipidemia: a CEN study. Clinical Experience Network.

BACKGROUND: Dyslipidemia constitutes a serious health problem that should be diagnosed and treated by the family physician. Little is known about the efficacy of typical dietary therapy for patients with abnormal cholesterol levels. This study was the first large prospective family practice evaluation of the effectiveness of diet-and-exercise therapy followed by a pharmacologic intervention for those patients who remained dyslipidemic. METHODS: Patients who met standard criteria for cardiovascular disease risk based on lipid analysis were enrolled in a typical 6-week physician-directed diet-and-exercise program. Those patients who were still dyslipidemic after that period were started on 12 weeks of pharmacologic treatment with gemfibrozil. RESULTS: Of the 2992 patients screened, 1193 were eligible for participation in the study. The diet-and-exercise program led to a modest change in lipid values (average decrease in total cholesterol of 4.1%). Only 2% of the patients achieved desirable levels of all lipid values. Seven hundred thirty-nine subjects qualified for further therapy and were treated with gemfibrozil. Seventy patients discontinued drug therapy because of adverse effects. Those who completed 12 weeks of pharmacologic therapy had an additional 5.4% reduction in total cholesterol, 3.9% reduction in low-density lipoprotein cholesterol, 30.6% reduction in triglycerides, and a 17.2% increase in high-density lipoprotein cholesterol. CONCLUSIONS: These findings suggest that in a typical clinical setting, a nonpharmacologic intervention of diet and exercise may not produce the desired overall lipid changes in the majority of dyslipidemic patients.

Cholesterol↗
PubMed1992

The effect of tissue expansion on previously irradiated skin.

Opinion remains divided over the advisability of tissue expansion in previously irradiated skin. We examined the properties of, and complications associated with, tissue expansion in previously irradiated rabbit scalps. Irradiation injury was produced using fractionated roentgen rays, with a total dose of 5000 cGy over a 5-week interval. Following a 20-week convalescence interval, expansion was incrementally conducted over 4 weeks. Monitored parameters included cutaneous perfusion as indicated by fiberoptic dermofluorometry, intraluminal pressure, linear surface gain, and area of surface necrosis. The incidence and severity of complications, including surface necrosis, were significantly higher among irradiated animals. Furthermore, the overlying skin of irradiated animals demonstrated a significantly decreased compliance and measurable area gain. Given the inferior expansibility and higher tendency toward complications with contemporary expansion techniques in previously irradiated skin, alternate reconstructive options are preferable in this setting.

Animals↗
PubMed1991

Primary parotid malignancies. A clinical and pathologic review.

One hundred ninety-four patients with primary malignant tumors of the parotid gland who underwent surgery at the Mayo Clinic (1970 through 1987) are reviewed. Survival patterns were analyzed using the Kaplan-Meier product-limit method that separated histologic results into three significantly different groups. Survival rate was highest for patients with acinic cell, adenoid cystic, and low-grade mucoepidermoid carcinomas; intermediate for patients with high-grade mucoepidermoid carcinomas; and lowest for the remaining six histologic types encountered. Cox multiple linear regression was used to identify patient and tumor characteristics with greatest prognostic significance. In order of decreasing strength, regional metastatic involvement, pain, male gender, grade, stage, and advancing age all demonstrated independent prognostic significance. Fifty-three percent of patients requiring facial nerve sacrifice were asymptomatic at presentation. A high positive correlation was observed between advancing grade and stage.

Adolescent↗
PubMed1988

Direct current electrical bone growth stimulation for spinal fusion.

An electronic bone growth stimulator (EBGS) had been devised to facilitate lumbosacral fusion in the early 1970s, using a totally implanted device which delivers a steady 5 microA at each of four cathodes. The use of the device is reserved for patients in whom painful and abnormal motion is demonstrated to be the major cause of low-back pain. An initial series (I-A) of 82 patients demonstrated a successful fusion rate of 91.5% compared with a 80.5% fusion rate in 159 patients treated without the EBGS. A second prospective randomized controlled trial series (II) was begun using only "difficult patients," that is, patients who had either one or more previous failed fusions, a grade II or worse spondylolisthesis, a multiple-level fusion or the presence of another high-risk factor such as obesity. These patients were randomized by protocol as to whether they received a stimulator or not. The fusion rates of the two groups were assessed radiographically by the operating surgeon and by an independent radiologist 12 to 18 months postoperatively. Statistical review confirmed the comparability of the groups. Success, defined as radiographic fusion, was achieved in 15 of 28 control patients (54%) compared with 25 of 31 EBGS treated patients (81%). This result is statistically significant (P = 0.026, one-tailed Fisher's Exact test). Meanwhile, a continuing nonrandomized study (I-B) has continued and at this point the success rate is 90.5% in an additional 116 patients, confirming the results of the earlier nonrandomized series (I-A).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1986

Reduction of myocardial infarct size by neutrophil depletion: effect of duration of occlusion.

Experiments were performed in the dog to examine the effects of neutropenia on ultimate infarct size resulting from short (90 minutes) or prolonged (4 hours) circumflex coronary artery occlusion. Sheep antiserum to canine neutrophils was used to produce neutropenia. Control animals received nonimmune serum. Neutrophil infiltration into myocardial infarcts was examined using histopathologic techniques and a semiquantitative scoring system. In 90-minute occlusions with 24-hour reperfusion, neutropenia was associated with the development of significantly smaller infarcts: normopenic group, 43.2% +/- 3.3% (n = 7) vs. neutropenic group, 26.6% +/- 3.7% (n = 10) of the area at risk, means +/- SEM. However, in 4-hour occlusion with 6-hour reperfusion experiments, the tendency of neutrophil depletion to reduce infarct size did not reach statistical significance (46.4% +/- 7.2% vs. 31.5% +/- 6.0% of the area at risk, normopenic vs. neutropenic) despite differences in neutrophil infiltration into the reperfused region. The observed differences in ultimate infarct size could not be attributed to differences in myocardial oxygen consumption. The results suggest that a significant amount of myocardial infarction induced by a limited duration of coronary artery occlusion followed by reperfusion is neutrophil dependent and appears to be less important in determining the fate of myocardium subjected to more prolonged periods of ischemia followed by reperfusion.

Agranulocytosis↗
PubMed1985

Basic decision making in management of scoliosis.

Scoliosis is a lateral curvature of the spine, which may require treatment; this brief analysis details those factors weighed in the basic decision-making process. Additional technical details are presented in subsequent sections.

Adolescent↗
PubMed1984

Canine myocardial reperfusion injury. Its reduction by the combined administration of superoxide dismutase and catalase.

Therapy directed against the toxic effects of reactive oxygen species may reduce the final extent of ischemic injury in otherwise viable tissue irreversibly injured by the abrupt reoxygenation of reperfusion. In four groups of dogs, superoxide dismutase plus catalase (groups I-III) or saline (controls) (group IV) was infused into the left atrium. Group I received the infusion for 2 hours, beginning 15 minutes before occlusion of the left circumflex coronary artery (90 minutes) and ending 15 minutes after reperfusion. Group II received the infusion for 1 hour starting 15 minutes before reperfusion. Group III received the infusion for 1 hour beginning 40 minutes after reperfusion. Dogs were killed the next day, and infarct size was determined by dissection and weighing, and confirmed histologically. Infarct size expressed as percent of the anatomic area at risk was: group I, 19.4 +/- 5.0; group II, 21.8 +/- 3.3; group III, 47.6 +/- 10.3; group IV, 43.6 +/- 3.5 (mean +/- SEM). Analysis of variance followed by Duncan's multiple range test showed that ultimate infarct size as assessed in groups I and II differed significantly (P less than 0.05) from that observed in the control animals in group IV, whereas infarct size between groups III and IV did not differ significantly (P greater than 0.05). The percent of left ventricle at risk did not differ between the four groups. The beneficial effects of superoxide dismutase plus catalase could not be explained by hemodynamic differences. Similar protection of jeopardized myocardium in groups I and II suggest that potentially viable tissue is salvaged by scavenging free radicals during early reperfusion.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1982

Functional disability in the hospitalized elderly.

Little documentation exists concerning the extent of functional disability in the hospitalized elderly and the impact of this disability on the care of these patients. A physician-led survey was conducted in a 400-bed community hospital of 279 patients aged 70 or more years. Considerable age-correlated disability was documented. Fifty-four percent of the patients aged 85 years or older were moderately or severely disoriented. Thirty-four percent had impaired hearing, 40% had impaired vision, and 25% had speech impairments. More than half of the patients 75 years or older needed assistance with activities of daily living. Modern hospital design and services may interfere with functional recovery. Evaluation of special care units to minimize the hazards of hospitalizing the elderly is recommended.

Activities of Daily Living↗