W L Weaver

University at Buffalo, The State University of New York, Buffalo, NY, United States

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Publications (17)15.5 Total impact

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    ABSTRACT: Increased intracranial pressure is often relieved by a ventriculoperitoneal shunt. The shunt has a one-way valve which can withstand pressures of 300 mmHg and prevent reflux of intraabdominal fluid. We have utilized laparoscopy for cholecystectomy in four patients with VP shunts. In all patients the peritoneal cavity was free of adhesions. When CO2 insufflation pressure was as high as 10-15 mmHg cerebrospinal fluid was still noted to flow from the end of the shunts. In three patients the entire procedure was performed laparoscopically. In the fourth patient the procedure was converted to an open cholecystectomy because of extensive inflammation surrounding a gangrenous gallbladder. Postoperatively the shunts remained intact and functional. There were no central nervous system sequelae. None of the shunts became infected. Elective laparoscopic cholecystectomy in patients with VP shunts can be done safely without a need for clamping or other manipulation of the shunt.
    Surgical Endoscopy 05/1995; 9(4):409-10. · 3.43 Impact Factor
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    ABSTRACT: Young blacks with colon cancer continue to have a poor survival rate for reasons that remain undetermined. Medical records of blacks with colon cancer diagnosed at an inner-city hospital during a 10-year period were reviewed. The cohort consisted of 118 indigent, nonmigratory patients grouped by age. Group 1 consisted of 11 patients under age 50, and group 2 consisted of 107 patients age 50 and over. Admission symptoms were significantly different between groups. Patients in group 1 presented with abdominal pain more often than patients in group 2, and none of the patients in group 1 had anemia or obstruction, which comprised 14% and 11%, respectively, of the presenting symptoms in group 2 patients. Overall, survival difference was significant; the survival rate was 22.8 months for group 1 and 64.2 months for group 2 (P < .02). There was no difference in stage at presentation to account for the decreased survival in group 1. It is possible that the overwhelming majority (45%) of patients in group 1 with abdominal pain actually had more virulent disease, which accounts for the short survival. These individuals must be targeted for more aggressive patient education, surveillance, early detection and treatment, and follow-up.
    Journal of the National Medical Association 03/1994; 86(3):216-8. · 0.91 Impact Factor
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    ABSTRACT: Acts of violence within a statewide prison population were reviewed to determine the incidence, types of injuries, surgical procedures required, persons involved in the trauma, and weapons used to inflict the injuries. The objective was to identify trends to aid in developing methods of prevention. Over a 3-year period, 1600 prisoners from the state of Tennessee were hospitalized at our institution. The majority were from the maximum security unit. There were 133 episodes of trauma. Our study focused on the first admission of 94 inmates. Fourteen (15%) of the injuries were self-inflicted, including seven self-inflicted penetrating wounds. Nineteen different weapons were used to inflict trauma. Prison cafeteria utensils and workshop utility and office devices may need to be redesigned because these items are frequently used in acts of violence. Victims subjected to repeated episodes of violence should be relocated. Lastly, self-mutilators may need to be transferred to an institution for the mentally impaired for their own protection.
    Southern Medical Journal 05/1992; 85(4):365-9. · 0.92 Impact Factor
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    ABSTRACT: In vitro production of PGI2 in canine gallbladders subjected to hypovolemic shock and Escherichia coli sepsis was studied to determine whether a precursor above arachidonic acid in the cyclooxyenase cascade might be operative in the production of prostacyclin, which, in turn, may play a role in the pathogenesis of acute acalculous cholecystitis (AC). L-alpha-phosphatidylcholine (LaP), an arachidonic acid precursor, was used as the test agent. LaP did not stimulate PGI2 production from either gallbladder surface in the hypovelimic animals or the mucosa of the septic shock group. However, it did stimulate PGI2 production from the SS serosa compared with controls, 1375 +/- 432 versus 633 +/- 198 pg/cm2/min (P less than .05). In conclusion, lack of stimulation of PGI2 in the hypovolemic model suggests that PGI2 does not play a role in AC. Alternatively, it may play a role in preventing this disease process in septic shock. This study demonstrates the use of precursors of arachidonic acid and the cyclooxygenase pathway as active participants in the production of PGI2, although it is unclear whether the prostacyclin produced helps prevent AC in septic shock.
    Journal of the National Medical Association 05/1991; 83(4):325-8. · 0.91 Impact Factor
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    ABSTRACT: Despite the fact that a significant national effort has been made over the past 10 years to improve the early detection and treatment of colorectal cancer, blacks have not had any change in their prognosis compared to whites, and their survival rate appears to be independent of stage at the time of diagnosis. The disease incidence is practically the same for both races, 49 per 100,000. We reviewed all patients with colorectal cancer in our Tumor Registry over a 10-year period to determine whether the experience at an all-black institution with a black patient base for much of its history would help clarify these crucial questions. There were 118 cases (73 women/45 men), and the mean age was 68 years (range: 29 to 93). The most common signs and symptoms were gross bleeding (34%) and abdominal pain (30%), with most patients presenting with a combination of symptoms. Remarkably, none were symptom-free. Of the 96 patients who were staged surgically and pathologically, 68 (71%) were beyond Duke's B staging at the time of diagnosis and surgery. The overall 5-year survival rate was 47%, significantly related to stage of disease at diagnosis (P less than .001). We concluded that blacks have not shared in the progress made in early diagnosis and treatment of colon cancer, and that special attention should be given to developing screening and surveillance methodology targeted specifically at blacks.
    Journal of the National Medical Association 03/1991; 83(2):133-6. · 0.91 Impact Factor
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    ABSTRACT: Although the mechanism of cyclosporin (CsA)-induced hypertension is unknown, it has been shown to inhibit prostacyclin (PGI2) production directly, which may be a factor. We determined whether CsA had a differential effect on PGI2 production from the carotid artery (CA) and internal jugular vein (JV) compared to that from the renal artery (RA) and vein (RV) as a possible contributing factor to renovascular hypertension based upon the ability of organs to regulate their own blood flow according to local circumstances. The neck and renal vessels were removed from anesthetized adult female dogs (N = 8) and placed in a stimulation chamber, with Cell I being control (Hepes buffer), Cell II containing 0.3 mg/ml CsA, and Cell III containing CsA and 25 microM arachidonic acid (AA). Following serial stimulation periods, the supernatant was evaluated for PGI2 production by radioimmunoassay. PGI2 production from CA was significantly higher than that from RA following control and AA stimulation, 1474 +/- 382 pg/cm2-min vs 733 +/- 173 pg/cm2-min (P less than 0.05) and 2236 +/- 347 vs 1090 +/- 217 (P less than 0.01), respectively. CsA-induced PGI2 production from the carotid arteries was significantly greater than that from the renal arteries, 2944 +/- 586 vs 1003 +/- 235 (P less than 0.005). However, stimulation with AA following CsA resulted in sustained PGI2 production in both arteries that was similar to stimulation with CsA alone, 3014 +/- 600 vs 2944 +/- 586 for the carotids and 1278 +/- 280 vs 1003 +/- 235 for the renal arteries.(ABSTRACT TRUNCATED AT 250 WORDS)
    Journal of Surgical Research 06/1990; 48(5):481-4. · 2.02 Impact Factor
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    ABSTRACT: Brown recluse spider bites may result in extensive soft tissue injury, causing months of disability. We have described a patient who had a series of extensive surgical debridements after envenomation. Despite skin grafting, persistent cutaneous lesions and extensive satellitosis progressed to involve the entire lower extremity. A recent biopsy showed pseudoepitheliomatous hyperplasia and pyoderma gangrenosum complicating the original injury. Although the role of early surgical excision and newer forms of medical treatment including dapsone and antivenom are still in evolution, recent reports suggest that the majority of patients will respond to medical therapy and may not require any surgical intervention.
    Southern Medical Journal 03/1990; 83(2):243-6. · 0.92 Impact Factor
  • E L Hoover, H Webb, C Walker, W L Weaver
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    ABSTRACT: We have described a patient with multiple hepatic abscesses caused by a perforated jejunal diverticulum with a presumed route of infection via the portal vein. Patients with hepatic abscesses and no known source of infection should be evaluated for a contained mesenteric perforation of the gastrointestinal tract. Finally, in patients who fail to respond promptly to percutaneous catheter drainage of a liver abscess, a continuing source of infection, such as perforation of a jejunal diverticulum, should be suspected.
    Southern Medical Journal 02/1990; 83(1):54-6. · 0.92 Impact Factor
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    ABSTRACT: THE BROWN RECLUSE spider, Loxosceles reclusa, is normally a nonaggressive arthropod that tends to bite humans only when trapped in clothing or when accidentally cornered. The diagnosis of brown recluse spider bite is often difficult to document because of the lack of a specific clinical test; therefore it is frequently based upon circumstantial evidence such as a Compatible skin lesion and the patient's recollection of what transpired. The spider has relatively soft fangs, which limits the depth of injection. The venom rapidly becomes attached to the tissues and can be detected in the wound site for four to five days. It contains a number of substances that promote tissue destruction, including collagenases, proteases, phospholipases, and hyaluronidase. Envenomation is seldom fatal, and the primary problem in the majority of victims is management of the resulting wound, particularly in patients who are first seen many days after injury. We report our experience with a patient in whom the damage spread to include the entire left lower extremity despite repeated aggressive surgical debridement and skin grafting. We review the difficulty in making the diagnosis, and present evidence strongly suggesting that leukocyte inhibition with dapsone and the administration of antivenom are much more effective than early, aggressive surgical intervention. We also report an uncommon finding of pseudoepitheliomatous hyperplasia, and discuss its pathogenesis and implications for long-term follow-up of these patients. (C) 1990 Southern Medical Association
    Southern Medical Journal 01/1990; 83(2). · 0.92 Impact Factor
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    ABSTRACT: Multiple synchronous primary intra-abdominal neoplasms involving more than one organ system are rare, particularly if the appendix is involved. We report a patient with synchronous primary lesions in the colon, appendix, and the kidney. We also discuss the incidence of this entity with respect to sex and age, the organs most often involved in instances of multiple primary lesions, and review the criteria for differentiation of synchronous versus metachronous lesions.
    Journal of the National Medical Association 12/1989; 81(11):1177-8, 1183. · 0.91 Impact Factor
  • Journal of the Tennessee Medical Association 11/1989; 82(10):525-6.
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    ABSTRACT: Myocardial function with ultrastructure and high energy phosphate levels in dogs was correlated after 24 hours of sepsis using live Klebsiella aerogenes. All animals developed progressive hemodynamic deterioration over a 24 hour period. Mean arterial pressure decreased from 148 +/- 7 mmHg to 85 (P less than 0.01) and cardiac output decreased from 3.43 +/- .31 to 1.6 +/- 0.5 L/min. Left ventricular stroke work decreased from 48.2 +/- 5 to 18.1 +/- 6 gm-meters (P less than 0.001). Systemic and pulmonary vascular resistances were increased at 24 hours (3,538 +/- 27 to 7,404 +/- 1,400 dyne/sec/cm-5 (P less than 0.01), and 185 +/- 20 and 619 +/- 90 dyne/sec/cm-5 (P less than 0.001), respectively. Left ventricular function curves at 24 hours showed a fixed low output. However, myocardial ultrastructure was preserved and high energy phosphate levels remained normal. These observations correlate well with the changes seen clinically in early gram negative sepsis in hypovolemic patients. Thus, this appears to be a suitable model for further investigation of the effects of gram negative sepsis on myocardial performance, ultrastructure, and maintenance of energy stores.
    Journal of the National Medical Association 11/1989; 81(10):1033-40. · 0.91 Impact Factor
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    E L Hoover, W L Weaver
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    ABSTRACT: Improvements in biochemical assays, radiographic imaging, and perioperative monitoring; the availability of selective adrenergic blockers; and a better understanding of the pathophysiology of the disease have all contributed to the reduction in mortality and morbidity in patients with pheochromocytomas. Twenty-four-hour urinary catecholamines are more reliable than blood levels in detecting pheochromocytomas. The diagnosis may be confirmed by elevated epinephrine fractions when total catecholamine levels are normal. Computerized tomography is the preferred imaging tool, although ultrasound and magnetic resonance are preferred during pregnancy. 131I iobenguane scanning is useful in locating extra-adrenal disease and may have a role in the treatment of metastases. Total alpha-adrenergic blockade with phenoxybenzamine versus selective (alpha 1) blockage with prazosin are equally effective preoperatively. Invasive monitoring is necessary in all patients, and agents to control arrhythmias, hypertension, hypotension, and cardiac arrest are prepared in advance. Patients with benign lesions have an excellent cure rate, and those with malignancies have effective palliation of their symptoms.
    Journal of the National Medical Association 08/1989; 81(7):777-9. · 0.91 Impact Factor
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    ABSTRACT: A retrospective review was conducted to determine if there were identifiable racial markers in patients who were explored and misdiagnosed as having appendicitis. Between May 1983 and May 1987, 100 patients were explored for appendicitis. There were 65 whites and 35 blacks with a male predominance in each group. The age range was 4 to 70 years with a mean of 47 years; 30% of each group was in the pediatric age range (less than 17 years old). Eight patients had a normal appendix including two blacks: a 20-year-old male with no pathologic diagnosis and a 42-year-old female with a ruptured cornual pregnancy. Although the sample size was small, there was a trend toward a lower white blood cell count in blacks when appendicitis was confirmed at surgery (11,000 cells/microL +/- 3,000 v 17,000 cells/microL +/- 3,000). The following conclusions can be drawn: (1) the accuracy of diagnosis should be considerably lower than the 20% commonly quoted; (2) the likelihood of an incorrect diagnosis appears to be higher in adults in both groups without a sexual predilection; and (3) there may be a trend toward a higher initial white blood count in whites compared with blacks with acute appendicitis.
    Journal of the National Medical Association 04/1989; 81(3):269-71. · 0.91 Impact Factor
  • Journal of the Tennessee Medical Association 04/1989; 82(3):131-2.
  • Current Surgery 01/1989; 46(5):386-8.
  • Journal of the Tennessee Medical Association 11/1988; 81(10):620-1.

Publication Stats

54 Citations
15.50 Total Impact Points

Institutions

  • 1994–1995
    • University at Buffalo, The State University of New York
      • Department of Surgery
      Buffalo, NY, United States
  • 1989–1992
    • Meharry Medical College
      • Department of Surgery
      Nashville, Tennessee, United States