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Biomedical subjects

M H Adson

Publications and source records attributed to M H Adson.

7 recordsLinked to original sources
PubMed1991

Controlled expansion of peripheral nerves: comparison of nerve grafting and nerve expansion/repair for canine sciatic nerve defects.

The inherent disadvantages of nerve grafting have made it necessary to find alternative techniques for treating segmental nerve loss. This study compares the techniques of nerve grafting and nerve expansion/repair for the management of nerve injuries with segmental nerve loss in an animal model. Bilateral segmental sciatic nerve defects were created in eight dogs. On one side a 2-cm segment was excised and replaced with a nerve graft; on the other side a 2-cm defect was created with ligatures and the nerve underwent preliminary expansion and then repair. Eighteen months later nerve conduction velocity (NCV), gastrocnemius contraction force (GCF), and muscle weight (GMW) were determined for the seven surviving animals. NCV for the expanded repair was 58.66 +/- 34.18 m/sec and 47.73 +/- 7.93 for the grafted repair (p = 0.4); GCF was 619.04 +/- 353.70 gm for the expanded repair and 726.80 +/- 415.78 gm (p = 0.2) for the grafted repair; and GMW was 82.80 +/- 5.68 gm for the expanded repair and 109.55 +/- 20.63 gm (p = 0.02) for the grafted repair. The data suggest that: 1) conventional tissue expansion techniques can be used successfully to repair segmental peripheral nerve defects; 2) NCV and GCF are comparable for grafting and expansion/repair techniques although GMW is significantly higher in the grafted group; and 3) nerve expansion/repair may prove to be a useful alternative to grafting.

Action Potentials↗
PubMed1990

Management of acute fingernail injuries.

This article describes and illustrates the process of nail regeneration and suggests specific management for acute nail bed injuries. The management consists of direct, nail matrix repair and nail matrix split grafting. Postoperative care following nail bed injuries is also discussed.

Finger Injuries↗
PubMed1987

Scalp expansion in the treatment of male pattern baldness.

Tissue expansion has been extremely valuable in the treatment of traumatic scalp defects. We have recently used expansion techniques in the treatment of male pattern baldness. Expansion has been used in conjunction with scalp-reduction procedures and pedicled hair-bearing flaps. Flaps have been designed as Juri flaps, and in one patient, a new posteriorly based flap was used. This design gives the advantage of a more natural-appearing hairline and forward-growing hair. The major advantage of tissue expansion in the treatment of male pattern baldness is that it generates new hair-bearing scalp. The increase in vascularity which occurs during expansion allows for large, safe, and predictable flaps. Donor sites are also relatively easily closed. The disadvantages of expansion include the need for two or more surgical procedures and multiple office visits. There is also some discomfort following expansion and a cosmetic defect as the expanders become larger. Complications include infection, exposure or extrusion, deflation, and hair loss. Tissue expansion combined with scalp reduction and pedicled hair-bearing flaps have proved to be a valuable technique in the treatment of male pattern baldness with a high degree of patient satisfaction.

Adult↗
PubMed1987

Tissue expansion in the upper extremity.

The use of temporary inflatable implants to generate expanded skin flaps in the upper extremity is a useful reconstructive technique. Applications, technique, and complications are discussed and emphasized with case reports.

Adolescent↗
PubMed1984

Resection of hepatic metastases from colorectal cancer.

We studied 141 patients who had resection of hepatic metastases from colorectal cancer, considering all such lesions removed between 1948 and 1982. The study involved extended observations of patients described previously. Also included were 21 patients who had wedge resections of small metastases done since 1976, who, therefore, did not qualify for analysis of major hepatic resections reported recently (1980 and 1983). The overall five-year survival rate was 25%, significantly higher than that of a group of historical controls who had resectable metastases that were not removed. The size and nature of our extended sample allowed identification of some determinants of favorable prognosis: Dukes' stage of the primary lesion, absence of extrahepatic metastases, and being female. Contrary to our earlier observations, this study justified removal of some multiple hepatic metastases.

Carcinoma↗
PubMed1984

The natural history of hepatic metastases from colorectal cancer. A comparison with resective treatment.

Five-year survival after resection of hepatic metastases from colorectal cancer is 25%. Although resection palliates some patients who do not live that long, 50% of patients so treated are not helped at all. Until ignorance of a cancer's real stage is resolved by improved techniques, the evaluation and choice of therapy can be based only upon knowledge of the natural history of untreated metastases and determinants of prognosis derived from treated patients. Analysis of the survival rates of 252 patients who had biopsy proven, unresected hepatic metastases that were the only evidence of residual disease shows the extent to which natural history, rather than resection, may determine length of survival-- and indicates the need for critical analysis of 2- and 3-year survival rates reported after any therapy. Study of 141 patients who had hepatic metastases resected shows that the stage of the primary lesion, being female, and the absence of extrahepatic metastases are significant determinants of favorable prognosis after resection of hepatic metastases.

Colonic Neoplasms↗