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Biomedical subjects

T A Cochran

Publications and source records attributed to T A Cochran.

5 recordsLinked to original sources

Bleeding peptic ulcer: surgical therapy.

The management of bleeding peptic ulcer disease varies with multiple clinical and endoscopic variables. For the patient with rapid hemorrhage and hemodynamic instability refractory to endoscopic control, operation clearly is indicated. For patients with a low probability of recurrent ulcer hemorrhage because of the absence of endoscopic stigmata or clinical predictors of further ulcer bleeding, nonoperative management with selective use of endoscopic hemostasis is appropriate. For the remaining patients with a moderate risk of recurrent ulcer hemorrhage, the clinician must use what is known of the clinical and endoscopic predictors of recurrent hemorrhage and arrive at a judgment regarding the selective use of endoscopic hemostasis and subsequent early operation. For elderly patients with a large duodenal or gastric ulcer who have experienced significant blood loss precipitating an episode of hypovolemic shock and who have endoscopic stigmata of ulcer hemorrhage, early elective operation after endoscopic hemostasis is the most judicious course. Surgery also is the wise choice for those patients in whom an initially successful attempt at endoscopic hemostasis fails and who rebleed while hospitalized. Recommendations for the surgical management of bleeding peptic ulcer disease include Immediate operation for (1) patients with rapidly exsanguinating ulcer hemorrhage and (2) patients with active bleeding and failure of endoscopic hemostasis to control the bleeding. Early elective operation after initial endoscopic hemostasis for (1) elderly patients with comorbid disease and/or hemodynamic instability who have active arterial ulcer hemorrhage (Forrest Ia) controlled with endoscopic hemostasis; (2) elderly patients with comorbid disease and/or hemodynamic instability who have a visible vessel in an ulcer crater (Forrest IIa) treated with endoscopic hemostasis: surgery is particularly advised in this circumstance for those with a positive arterial Doppler signal in the ulcer crater or a large posterior duodenal ulcer or a large lesser-curvature gastric ulcer; and (3) elderly patients with comorbid disease and/or hemodynamic instability who develop recurrent ulcer bleeding while hospitalized or with a total blood transfusion requirement exceeding 5 U.

Blood Transfusion↗

Abdominal lipectomy as an office procedure.

Because of the increasing cost of hospitalization, many plastic surgeons have tried to make cosmetic surgery more affordable by performing procedures in the office operating room under local anesthesia and sedation. Standard abdominal lipectomy has classically been considered a procedure to be carried out in the hospital under general anesthesia. Following is the author's technique for performing the procedure under local anesthesia in the office setting.

Abdomen↗

Phenylbutazone kinetics and metabolite concentrations in the horse after five days of administration.

Phenylbutazone (PBZ) was administered (8.8 mg/kg of body weight) every 24 hours for 5 consecutive days, orally for the first 4 days and IV on day 5. The half-life (t 1/2) after this daily administration was 6.2 hours and the volume of distribution was 0.152 +/- 0.014 L/kg; the bioavailability after oral administration was 91.8 +/- 2.5%. The plasma concentration of PBZ at experimental hour (EH) 24 (24 hours after the 1st oral dose) was 1.7 +/- 0.39 micrograms/ml and increased to 4.2 +/- 0.29 micrograms/ml at EH 48 (24 hours after the 2nd oral dose). Values at EH 72, 96, and 120 (24 hours after administration of oral doses 3 and 4, and IV dose 5, respectively) were 4.8 +/- 0.62 micrograms/ml, 5.3 +/- 0.84 micrograms/ml, and 4.3 +/- 1.1 micrograms/ml, respectively. Significant increases (P less than 0.05) were measured between EH 24 and 48 with no changes during the subsequent 3 days. Changes in the urinary concentrations of PBZ were not seen over the 5-day dosing period. There were increases in the metabolites oxyphenbutazone and the alpha-alcohol during the 5-day dosing period. There was a delay in the appearance of alpha-alcohol in urine after oral and IV administration.

Administration, Oral↗

The failure to survive of autogenous free grafts of whole gracilis muscles in dogs.

An experimental study was undertaken to define the limits in size (if any) of successful free autogenous grafts of skeletal muscle. In 8 dogs, 16 gracilis muscle grafts were transplanted to the contralateral hind limb. The left hind limb served as a control for the right side, which contained paralyzed muscle. Macroscopic, microscopic, and EMG analyses demonstrated a complete failure of the free muscle grafts to take and survive. We have shown that one can exceed the limitations to the size of a successful muscle graft. Perhaps future investigators will define exactly what the maximum viable size is.

Animals↗