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PubMed1994

Role of 99mTc-labeled DISIDA scan in the assessment of marginal liver grafts after orthotopic transplantation.

Accurate prognostic indicators are lacking for livers with early marginal graft function, making the decision to re-transplant a difficult one. Therefore, we studied 99mTc-labeled DISIDA scanning as a predictor of recovery of marginal grafts. Records of 28 liver transplant recipients with prolonged periods of marginal graft function after liver transplantation were analyzed. Twelve of 28 (Group I) had delayed PNF and were re-transplanted within 3-8 days (mean 5.3) of surgery. The remaining 16 (Group II) recovered slowly, with normal graft function at 1 month. All patients received DISIDA scans 2 to 5 d after surgery. Clearance of tracer from the blood pool was slower in Group I patients (77S +/- 241 sec) than in Group II (260 +/- 38 sec; p < 0.01). Qualitative differences in the pattern of parenchymal uptake were also noted. Homogenous uptake, consistent with cholestasis, was seen in 15/16 (94%) Group II patients, with improved uptake after 7-35 d. In contrast, 11/12 Group I patients had non-homogenous uptake, consistent with multiple liver infarctions. This pattern correlated with higher peak SGOT in Group I (4358 +/- 658 U/dl vs 1636 +/- 127 U/dl p < 0.01), and PT (20 +/- 0.7 sec vs. 16.5 +/- 0.36 sec; p < 0.01). In summary, delays in DISIDA tracer clearance from blood, and non-homogenous hepatic uptake correlate with elevated liver function tests and with delayed PNF. Homogenous uptake correlates with graft recovery. DISIDA scans may, therefore, be useful in predicting recovery of marginal grafted livers.

Adult↗
PubMed2002

Chemokines: directing leukocyte infiltration into allografts.

Chemokines have been shown to play a critical role in the recruitment of leukocytes to transplanted organs. Animal models and clinical studies have demonstrated predictable temporal and spatial correlations between chemokine production and leukocyte infiltration into allografts. Antagonism of chemokines or chemokine receptors has been shown to delay leukocyte infiltration and prolong graft function, demonstrating an important role for chemokines in allograft rejection.

Animals↗
PubMed1986

Graft irradiation abrogates graft-versus-host disease in combined pancreas-spleen transplantation.

A model of combined pancreas-spleen transplantation (PST) was studied in LBN F1 recipients of Lewis grafts in order to evaluate the efficacy of pretransplant graft irradiation in preventing lethal graft-versus-host disease (GVHD). Recipients of unmodified PST uniformly developed severe GVHD and died (MST = 16.7 +/- 3.8 days). Whole body donor irradiation with either 500 or 250 rad prevented lethal GVHD. Similarly, ex vivo graft irradiation with either 1000 or 500 rad also resulted in normal weight gain, graft function, and host survival for the 6-week study period. Conversely, delay of graft irradiation until 3 days after transplantation failed to prevent this complication (MST = 15.8 +/- 3.7 days). Recipients of irradiated grafts displayed glucose tolerance tests that were identical to those in the control group indicating that the doses of radiation employed in these experiments were not deleterious to islet function. Irradiated spleen grafts appeared histologically normal at 6 weeks after transplantation. Cells derived from these grafts failed to stimulate lymph node enlargement in a popliteal lymph node assay for GVHD, suggesting that these spleens may have become repopulated with host cells. These experiments confirm that PST has the potential to cause lethal GVHD and suggest that pretransplant graft irradiation may be used to prevent its occurrence.

Animals↗
PubMed1989

Sensitization and crossmatching in renal transplantation.

1. Presensitization in first cadaver kidney recipients can lead to increased risk of graft failure by hyperacute rejection, or delayed function up to 1 month. Fifty percent of the hyperacute rejections occurred in nonsensitized recipients. The number of "classical" hyperacute rejections was small, but they have been occurring at a rate of about 10 per year. 2. One-year graft survival of nonsensitized recipients of first and second cadaver transplants was about the same. One-year graft survival of broadly sensitized recipients of first and second cadaver transplants was 8% lower than those who were moderately sensitized. One-year graft survival of second cadaver transplants in all sensitized recipients was significantly lower (9-13%) than in first cadaver transplants. 3. The proportion of transfused recipients was 89% in parous females, 84% in nulliparous females, and 80% in males. Pretransplant transfusions also increased sensitization of males and females awaiting their first kidney transplant. Females were significantly more sensitized than males, whether they were transfused or not. 4. One-year graft survival rates of transfused recipients were 5-9% higher than nontransfused recipients. Highly sensitized patients who were transfused had the same 1-year graft survival as nontransfused, nonsensitized recipients. 5. Patients in Southern California waiting for a second transplant were more broadly sensitized than those waiting for a first kidney. A higher proportion of sensitized patients were waiting more than 3 years for a second transplant than for a first. 6. Patients waiting for a first transplant were more sensitized than those transplanted for the first time. The highest number of waiting or transplanted patients was blood group O. 7. A significantly greater proportion of sensitized patients with blood groups A and B was waiting than those with blood type O. The type O patients were transplanted at the same rate as they entered the waiting list. It is possible that sensitized type O patients were being discouraged from entering the waiting list. 8. A significantly smaller proportion of broadly sensitized SLE patients was waiting for a first transplant since 1988, although SLE patients were more broadly sensitized compared to those with other diseases and waiting since 1981 to 1987. This further confirms that many SLE patients are transplanted, as their sensitization is more often associated with autoantibody. 9. The highest proportion of currently sensitized recipients occurred in the transplants with 0 mismatches for the HLA-A,B specificities of the donor kidney.(ABSTRACT TRUNCATED AT 400 WORDS)

ABO Blood-Group System↗
PubMed2002

Salvage of limb and function in necrotizing fasciitis of the hand: role of hyperbaric oxygen treatment and free muscle flap coverage.

We report a case of necrotizing fasciitis of the hand treated by urgent debridement followed by serial debridements, hyperbaric oxygen, and delayed free muscle flap coverage. After control of the infection, a major soft-tissue defect remained on the dorsum of the wrist and hand, exposing all extensor tendons. A rectus muscle free flap was used for wound coverage and salvage of the exposed tendons; the muscle flap was covered with a delayed skin graft. The patient regained satisfactory function with ability to extend all digits. This case emphasizes the importance of aggressive debridement and hyperbaric oxygen treatment and shows the valuable role of free muscle flap wound coverage for preservation of function in cases of necrotizing fasciitis of the hand.

Adult↗
PubMed2000

Delayed recovery of movement-related cortical function in Parkinson's disease after striatal dopaminergic grafts.

Intrastriatal transplantation of dopaminergic neurones aims to repair the selective loss of nigrostriatal projections and the consequent dysfunction of striatocortical circuitries in Parkinson's disease (PD). Here, we have studied the effects of bilateral human embryonic dopaminergic grafts on the movement-related activation of frontal cortical areas in 4 PD patients using H2 15O positron emission tomography and a joystick movement task. At 6.5 months after transplantation, mean striatal dopamine storage capacity as measured by 18F-dopa positron emission tomography was already significantly elevated in these patients. This was associated with a modest clinical improvement on the Unified Parkinson's Disease Rating Scale, whereas the impaired cortical activation was unchanged. At 18 months after surgery, there was further significant clinical improvement in the absence of any additional increase in striatal 18F-dopa uptake. Rostral supplementary motor and dorsal prefrontal cortical activation during performance of joystick movements had significantly improved, however. Our data suggest that the function of the graft goes beyond that of a simple dopamine delivery system and that functional integration of the grafted neurones within the host brain is necessary to produce substantial clinical recovery in PD.

Adult↗
PubMed2002

Toward further expansion of the organ pool for adult liver recipients: splitting the cadaveric liver into right and left lobes.

BACKGROUND: Current methods of living donor right lobe transplantation can be expanded for use in the cadaveric setting. The aim of this study is to discuss alternative methods for the management of large-for-size cadaveric livers and determine the feasibility of splitting these organs into left and right hemi-livers using similar techniques to those used in the living donor setting. METHODS: The indication for an in situ right-left split procedure was an offer of a large liver for a small recipient with a recipient-donor ratio of greater than 1.5. A total of three livers were split. Mean donor age was 33.3 (range, 22-40) years. Mean weight was 118 (range, 90-150) kg. All donors were without significant medical history and were hemodynamically stable, with normal liver function and short hospital stay. Mean duration of the procurement procedure was 235 (range, 210-270) min. Mean cold ischemia time was 8.5 hr. Mean recipient weight was 58.3 kg, and mean donor to recipient weight ratio was 2.0 (1.6-2.6). United Network for Organ Sharing statuses at the time of transplantation were 1 (n=1), 2A (n=1), and 2B (n=4). RESULTS: Immediate graft function was seen in five recipients. Delayed nonfunction was identified in one recipient of a left lobe, who did not undergo transplantation because of sepsis that resulted in death at 30 days. A second mortality occurred in a left lobe recipient, from a fungal brain abscess at 90 days. Complications related to the split included bile leaks in two patients, one necessitating operative revision. CONCLUSIONS: Splitting of livers from appropriate brain-dead donors into right and left lobes is technically and logistically feasible. The large-for-size organ provides a more substantial amount of liver tissue to each of the adult recipients, which may result in a greater graft to recipient weight ratio than the current standard that is used in the living donor grafting. The importance of this variable will need to be studied, because it may positively impact on the ability of the reduced-size graft to withstand donor-related organ system stress and injury, which is associated with brain death and the inevitable longer period of cold preservation.

Adult↗
PubMedDate not supplied

Acute renal failure during the early postoperative period in adult living-related donor liver transplantation.

BACKGROUND/AIMS: Acute renal failure after liver transplantation can occur in some and is an important postoperative complication. Our goal is to clarify the risk factors of acute renal failure after living-related donor liver transplantation (LDLT). METHODOLOGY: From March 1999 to August 2000, ten consecutive patients were investigated the changes of the systemic hemodynamics and the renal function. They were classified into Group A (Creatinine (Cre) was over 2.0 mg/dL) and B (Cre was below 2.0 mg/dL). Retrospective variables were examined with two groups A and B being compared. RESULTS: In both groups, Cardiac Index (CI) was above standard levels. However, the CI levels in Group B were significantly higher than those in Group A (p=0.031). The early postoperative transaminase levels were significantly higher in Group A than in Group B (p=0.049) and graft liver volume/recipient body weight ratio was significantly smaller in Group A than in Group B (p=0.016). CONCLUSIONS: Our study suggests that small-for-size graft or hypovolemia, resulting in the delay of the recovery of graft liver function, may be an important cause of acute renal failure during the early postoperative period in adult LDLT.

Acute Kidney Injury↗
PubMed2000

[Low-dose antithymocyte globulins in kidney transplantation: results of a protocol of intermittent administration].

BACKGROUND: Despite the long history of use of antithymocyte globulins (ATG) in renal transplantation, ideal doses and duration of ATG administration based on the monitoring of T lymphocytes have yet to be defined. METHODS: Two immunosuppressive regimens based on low dose rabbit ATG (thymoglobuline, Imtix-Sangstat, Lyon-France) were assessed during the first year post-transplant: daily ATG (n = 32) where 50 mg of ATG were given every day and intermittent ATG (n = 24) where similar doses of ATG were given for the first three days and then intermittently only if CD3+T lymphocytes (measured by flow cytometry) were > 10/mm3. Both groups received steroids, azathioprine and cyclosporin A (CsA). RESULTS: ATG-induced depletion was similar for PBL and T cells in both groups: it began at day one post-transplant, was submaximal at day 3 and reached maximum intensity between days 6 and 8 from which time cell counts progressively increased. However, T cell depletion was still present at day 20. The total ATG dose per patient (361 +/- 105 vs 556 +/- 119 mg/patient) and the mean cumulative daily dose of ATG (0.60 +/- 0.17 vs 0.80 +/- 0.14 mg/kg/d) were significantly lower in the IATG group (p = 0.0001, and 0.0006 respectively). The overlap of ATG and CsA treatment was 6.7 +/- 3 vs 7.4 +/- 4.3 days (p = ns) and the mean duration of ATG therapy was 12 +/- 3 vs 11 +/- 2.5 days in the IATG and DATG groups respectively (p = ns). ATG were given in an average of one dose every 1.6 days in the IATG group compared to one dose daily in the DATG group (p = 7 x 10(-7). There was no significant difference in renal graft function, the number of acute graft rejections or ATG related side effects and complications. Despite daily immunological follow-up, there was a net saving of 920 $/patient in the cost of treatment in the intermittent ATG group. CONCLUSION: Intermittent ATG had the advantage of a reduction in the dose of ATG and in the cost of treatment while offering similar T cell depletion and effective immunosuppression. This approach could be proposed as an induction protocol, particularly for patients with poor graft function in whom CsA introduction has to be delayed.

Adult↗
PubMed2006

Fresh osteochondral allografts for patellofemoral arthritis: long-term followup.

UNLABELLED: Treatment of patellofemoral osteoarthritis in young patients is a challenge for orthopaedic surgeons. Concern about loosening and wear in active young people render arthroplasty more suitable for older patients. Osteochondral allografts may be a good alternative, but reports of experience with such grafts in patellofemoral joints are limited. We retrospectively reviewed our results with fresh osteochondral allografts. Our hypothesis was that these grafts provide relief from osteoarthritis, improve knee function, and delay prosthetic knee replacement. From 1986 to 1999, 14 fresh patellofemoral or patellar allografts were implanted in knees of 11 patients younger than 55 years and diagnosed with advanced secondary osteoarthritis. At last followup (average, 10 years; range, 2.5-17.5 years), eight grafts were in place, four for more than 10 years and two for more than 5 years. Of the nonsurviving allografts, three survived more than 10 years. Radiographs of the knees with intact allografts showed mild or no degenerative changes. Average Knee Society scores improved (preoperative to last followup), with knee scores improving from 46 points (range, 38-60 points) to 82 points (range, 35-100 points) and functional scores from 30 points (range, 10-60 points) to 75 points (range, 20-100 points). Fresh osteochondral allografts can provide relief from the arthritic condition, improve knee function, and delay prosthetic knee replacement. LEVEL OF EVIDENCE: Therapeutic study, Level IV (case series). See the Guidelines for Authors for a complete description of levels of evidence.

Adult↗
PubMed2006

A new modified method for nasal lining: the Menick technique for folded lining.

Traditional lining techniques such as prefabricated flaps, hinge-over flaps, or second local flaps for lining are thick, stiff, or poorly vascularized. Support grafts have traditionally been placed incompletely or secondarily. Intranasal lining flaps have revolutionized reconstruction but are complex, tedious, and destructive to the residual nose. More recently, the forehead skin has been transferred for cover as a full thickness flap in three stages. It has allowed the modification of the traditional folded flap technique for lining to permit a simple, efficient, and widely useful method of lining replacement for common defects. Thin, supple, vascular lining is combined with delayed primary cartilage grafts to provide excellent functional and cosmetic results.

Basal Cell Carcinoma↗
PubMed1999

Helium vapour injury: a case report.

We report a case in which quick freeze injury occurred to both hands by helium vapour at extremely low temperatures. At the time of injury the victim was wearing protective gloves which were removed quickly after the accident. This prompt removal of gloves reduced the depth and severity of the injury. Initially he was treated by rapid thawing by immersing the hands in luke warm water (37 degrees C) and administering heparin by drip to prevent microvascular thrombosis. Delayed skin grafting was performed with good functional recovery. The circumstances accompanying this injury and preventive measures are discussed.

Adult↗
PubMed1996

Nitric oxide synthase inhibition is associated with decreased survival of cardiac allografts in the rat.

Nitric oxide is a biological mediator that regulates blood vessel wall tonus, enhances macrophage cytotoxicity, and inhibits cellular immune reactivity. Primary acute rejection is associated with increased intragraft production of NO but it is unknown whether this delays or enhances the loss of graft function. The aim of the current study was to determine the effect of L-NAME, a nitric oxide synthase inhibitor, on the course and histopathology of rat cardiac allografts with primary acute rejection. L-NAME decreased the graft survival time from 9.4+/-1.5 to 6.9+/-0.3 days; the histopathology at asystole showed predominantly ischemic necrosis. L-NAME combined with antihypertensive drugs restored the rejection time (from 8.6+/-0.4 to 14.2+/-3.2 days) and resulted in an acute rejection pattern. We conclude that blocking of nitric oxide formation during acute rejection of a vascularized cardiac graft results in a decreased graft survival time and ischemic graft necrosis, very likely secondary to unopposed vasoconstriction.

Animals↗
PubMed1997

Laparoscopic assisted live donor nephrectomy--a comparison with the open approach.

Live donor renal transplantation provides significant advantages when compared with cadaveric donor renal transplantation in terms of improved patient and graft survival, a lower incidence of delayed function, and a shorter waiting time. Yet despite these advantages, live donors continue to be an under utilized source of kidneys for transplantation. Disincentives to live donation include the length of hospitalization, postoperative pain, cosmetic concerns, and the prolonged convalescence associated with the donor operation. In many instances minimally invasive video-assisted techniques have proven more efficacious than standard open procedures in terms of patient discomfort, length of hospital stay, cost, and length of time until the patient can return to full activity. Laparoscopic live donor nephrectomies are being performed at our institution in an attempt to make live donation more attractive to the potential donor. The purpose of this study was to retrospectively review the results of laparoscopic live donor nephrectomy (LapNx) and to compare them with those obtained using the standard open approach (OpenNx). Ten consecutive LapNx were performed from February 1995 through April 1996. The control group consisted of the 20 consecutive OpenNx performed at the same institution from January 1991 through January 1995 immediately before the initiation of the LapNx program. Live donors were considered candidates for LapNx if they possessed at least one kidney with normal renal anatomy with single renal vessels and a single ureter. LapNx was safely performed in all cases. No patients required open conversion or blood transfusions. The allograft warm ischemic time for the laparoscopic cases was 4.2+/-1.3 min. All kidneys harvested laparoscopically produced urine on the table immediately upon revascularization. Presently nine of the ten recipients have functioning allografts. At three months posttransplant the calculated recipient creatinine clearances were 67.0+/-11.5 ml/min and 64.8+/-21.4 ml/min for the LapNx and OpenNx groups, respectively (P=NS). The LapNx donors had a significantly decreased estimated blood loss, shorter time until resumption of oral intake, decreased postoperative pain (in terms of decreased analgesic requirements), shorter hospitalization, and a shorter interval until the resumption of full activities (P<0.05 for all). In addition, the LapNx group donors returned to work sooner than the OpenNx group (3.9+/-1.6 wk vs. 6.4+/-3.1 wk, respectively) (P=0.024). Four individuals agreed to donate a kidney only after learning of the availability of the laparoscopic approach. We conclude that laparoscopic live donor nephrectomy is technically feasible. In addition, it may offer significant advantages over the standard open approach in terms of patient comfort and convenience. These advantages may make live donor renal transplantation more attractive to prospective donors. The potential decrease in hospitalization and convalescence may also prove to be financially advantageous. We believe that further careful study of this procedure is warranted.

Adult↗
PubMed1996

[Kidney transplantation in patients with urinary diversions or with anomalies of the lower urinary tract].

OBJECTIVES: To evaluate kidney graft response and survival in patients with anomalies of the lower urinary tract from the perspective of the type urinary diversion performed or cystoplasty. METHODS: 7 patients with anomalies of the urinary tract who underwent kidney transplantation a described and the literature reviewed. RESULTS: In one patient who received an orthotopic kidney, urinary diversion to a preexisting ileal neobladder was performed. In 6 patients cutaneo ureterostomy was decided at the time of transplantation to resolve urinary drainage initially. The scant morbidity and good functional results of the grafts have momentarily delayed reconversion to another type of diversion in some cases. The literature review has shown that in recent years most authors with significant series have advocated preservation and reconstruction of the recipient's bladder and, if not feasible, continent external diversion. CONCLUSIONS: Anomalies of the lower urinary tract do not preclude renal transplantation in these patients. A detailed study of the uropathy, including urodynamic evaluation, is required prior to transplantation. Bladder preservation and refunctionalization are desirable, but if not feasible, transintestinal suprapubic diversion should be considered.

Adult↗
PubMedDate not supplied

Myocardial rewarming mirrors intraoperative mammary artery graft function.

BACKGROUND: The internal mammary artery (IMA) bypass graft provides a satisfactorily long-lasting blood supply to the myocardium. However, its initial flow capacity can be insufficient with subsequent regional myocardial ischemia. We evaluated a method to assess the IMA graft function intraoperatively. METHODS: Twenty-five patients with three-vessel coronary artery disease underwent coronary artery bypass grafting on cardiopulmonary bypass. The in situ IMA was grafted to the left anterior descending coronary artery (LAD) in combination with two saphenous vein grafts to the left circumflex and right coronary artery. Distal anastomoses were performed during cold intermittent blood cardioplegia. After unclamping of the aorta and of the grafted IMA, the temperature at the cardiac anterior and posterior side was measured during the first 5 minutes of warm reperfusion. RESULTS: A sufficient IMA graft function was expressed by a typical rise in temperature: the cardiac anterior and posterior sides showed a parabolic and exponential course, respectively. The rewarming velocity expressed as the first derivative of temperature over time led to a sharp and early peak for the anterior side, and a smaller and delayed peak for the posterior side. Insufficient IMA graft function could be recognized by an atypical temperature course. CONCLUSIONS: Temperature measurement of the heart during warm reperfusion after hypothermic cardioplegia can help to assess the effectiveness of the IMA-LAD graft function.

Coronary Angiography↗
PubMed2002

The advantages of delayed nasal full-thickness skin grafting after Mohs micrographic surgery.

BACKGROUND: Full-thickness skin grafting following Mohs micrographic surgery (MMS) of the nasal tip and ala provides easy postoperative wound care and avoids functional impairment caused by wound contraction of the nasal ala free margins. Direct comparison of immediate and delayed skin grafting determined which offers greater success and defined factors contributing to success. OBJECTIVE: To determine if delayed or immediate full-thickness skin grafting results in better graft survival with improved function and appearance, and to identify the recipient bed characteristics, including the size of the wound, the proportion of the wound base having perichondrium, denuded cartilage, and granulation tissue, and graft survival for each technique. METHODS: We used a prospective study comparing 200 patients with wounds having a 3-5 cm2 surface area repaired immediately with a full-thickness skin graft (FTSG) to 200 patients with a delayed FTSG. The depth and diameter of the wound of the nasal ala and tip, and characteristics of recipient bed including size (cm2), location, proportion of wound base with perichondrium present, denuded cartilage, granulation tissue, and proportion of graft loss were the main outcomes measured. RESULTS: Partial graft loss occurred in 11% of those having delayed skin grafts and 30% of those with immediate repair. Delayed grafting was associated with a larger wound surface area (P <.0001), more denuded cartilage (P =.017), greater exposed perichondrium (P <.0001), and less partial graft loss (P <.001). When partial graft loss occurred, the area of loss was smaller with delayed FTSG (P =.036). Contraction of the wound and subsequent nasal valve impairment occurred less often with delayed FTSG (P <.0001). Graft depression was significantly less with delayed FTSG of the ala (P <.0001) and also improved on the nasal tip (P =.47). CONCLUSION: This prospective clinical trial of immediate and delayed FTSGs of the nasal tip and ala with denuded cartilage showed improved graft survival in cases where grafting was delayed for 12-14 days. During this period, substantial granulation tissue formed in the wound base. Assessment of the wound base and the presence of granulation tissue are key factors in the success of full-thickness skin grafting.

Aged↗
PubMed1989

Early rejection episodes.

1. Early rejection episodes had an overriding effect on graft survival. One-year graft survival decreased by 18% in LRD transplants and by 27% in cadaver-donor transplants when rejection occurred. Early rejection-free patients had 96% (LRD) and 87% (cadaver-donor) 1-year graft survival. 2. Among rejection-free recipients of first cadaver transplants, 1-year graft survival decreased by 5% when function was delayed for 8-14 days and by 10% when function was delayed more than 14 days, suggesting some rejections were masked by early nonfunction. 3. Rejections occurred in 30% of first cadaver donor transplants overall and ranged from 9-50% at individual contributing centers. Rejections occurred in 27% of LRD transplants and 37% of cadaver retransplants. 4. Histocompatibility affected the frequency of rejection as well as subsequent graft survival. The lowest incidence of rejection was 17% in HLA-identical sibling transplants, followed by 0 HLA-B,DR mismatched first cadaver transplants, with a progressive increase to 34% in completely mismatched (HLA-B,DR) first cadaver transplants. Parent and 1-haplotype sibling donor transplants were intermediate with a 30% incidence of rejection. In first cadaver transplant recipients with rejection, graft survival decreased from 78-59% with the degree of HLA mismatch. 5. Pretransplant transfusions also reduced the rejection frequency from 42% without to 24% with more than 4 transfusions.(ABSTRACT TRUNCATED AT 250 WORDS)

Blood Transfusion↗