Perioperative intra- and extravascular volume in liver transplant recipients.

UNLABELLED: Assessing adequate volemia to avoid fluid overload and pulmonary edema perioperatively in liver transplantation (LT) is a challenge both for the anesthetist and the intensivist. Volumetric preload indices, such as intrathoracic blood volume index (ITBVI), measured by transpulmonary thermodilution, and continuous end-diastolic volume index (EDVI), measured by pulmonary artery thermodilution, were shown to better reflect preload than central venous pressure (CVP) or pulmonary artery occlusion pressure (PAOP). An ITBVI increase soon after the graft reperfusion influenced pulmonary perfusion without an alteration of extravascular lung water index (EVLWI) and without impaired oxygenation. This study was designed to evaluate relationships between CVP, PAOP, ITBVI, EDVI, and stroke volume index (SVI) within 48 hours after LT. We also investigated the relationship between EVLWI and arterial partial pressure of oxygen and inspired oxygen fraction ratio (PaO(2)/FiO(2)). METHODS: We enrolled 125 patients (103 men and 22 women) undergoing LT. All patients were monitored with the PiCCO system (Pulsion Medical System) and with advanced pulmonary artery catheter connected to the Vigilance System. Hemodynamic-volumetric data were collected upon intensive care unit admission and every 8 hours up to 48 hours. Univariate and multivariate regression models were fitted to assess associations between SVI and EDVI, ITBVI, and filling pressures after adjusting for the right ventricular ejection fraction (RVEF, categorized as ≤30, 31-40, or >40) and the phase of the observation period. We also assessed associations between PaO(2)/FiO(2) and EVLWI. RESULTS: SVI was associated with EDVI, ITBVI, and RVEF. The models showing the best fit to the data were those including EDVI and ITBVI. Neither CVP nor PAOP showed correlation with SVI. EVLWI inversely correlated with PaO(2)/FiO(2). CONCLUSIONS: In the first 48 hours after LT, ITBVI and EDVI were associated with SVI assessment, whereas CVP and PAOP were not related. EVLWI significantly inversely correlated with PaO(2)/FiO(2).

Liver transplant quality and safety plan in anesthesia and intensive care medicine.

Patients scheduled for orthotopic liver transplantation (OLT) may have coexisting diseases and more likely receive grafts of poorer quality than in the past. Perioperative mortality and morbidity are usually due to a combination of factors related to the patient, graft, surgery, anesthesia, and intensive care management. Anesthesia and intensive care are the areas with the highest frequency and severity of errors. Error and accident risks are always present in this context where a human component is unavoidable. The matter of medical errors is becoming noteworthy worldwide. Nevertheless, data concerning medical errors during OLT are not available in Italy. There are only hypothetical evaluations. The number of adverse events may be high, but so far no specific programs have been developed to increase patient safety. To improve patient safety, anesthesia and intensive care units must use a proactive approach dedicated to an OLT program. We have presented herein a prevention policy to detect errors before they happen through incident reporting, anonymous and voluntary reports of adverse events or near misses, operating room checklists (patient, drugs, devices, equipment), improved training, safer facilities, equipment function, and adequate drug supplies for an OLT program.

Perioperative considerations in HIV-infected liver transplanted patients.

UNLABELLED: The introduction of highly active antiretroviral therapy (HAART) has improved survival in HIV patients, allowing them to undergo liver transplantation (OLT) in cases of end-stage liver disease. HIV patients show a higher incidence of pulmonary hypertension. The aim of this study was to evaluate pulmonary and systemic hemodynamic changes in HIV-infected patients compared with a non-HIV-infected group of patients undergoing OLT. METHODS: We analyzed 20 HIV-infected patients and 20 non-HIV-infected patients who underwent OLT. We analyzed preoperative cardiovascular status, as well as intra- and postoperative hemodynamic data. Hemodynamic data were recorded at 4 predefined phases during OLT and at 24, 48, and 72 hours after intensive care unit (ICU) admission. We also evaluated the following perioperative aspects: transfusion requirements, postoperative mechanical ventilation time, ventilation time, and length of ICU and of hospital stay. RESULTS: HIV-positive patients were younger than controls with a greater incidence of coinfection with hepatotropic viruses. One HIV-infected patient died in the ICU. Hemodynamic data showed a higher cardiac index and higher pulmonary vascular resistance index among HIV-infected patients, but without any clinical impact. No significant difference in blood unit transfusions, postoperative time on mechanical ventilation, or length of ICU or hospital stay was observed between the groups. CONCLUSIONS: Although the number of patients studied is limited, we concluded that HIV-infected patients undergoing OLT showed similar perioperative courses as non-HIV-infected patients.

The liver transplant recipient with cardiac disease.

Liver transplantation is a stressful condition for the cardiovascular system of patients with advanced hepatic disease. The underlying hemodynamic and cardiac status of patients with cirrhosis is crucial to determine which patients should became recipients. Generally preoperative cardiovascular testing is performed on potential candidates who are more than 45 years old, or have diabetes mellitus, or peripheral vascular disease, or more than two standard cardiac risk factors. Recent data suggest that the prevalence of coronary artery disease among patients with cirrhosis is much greater than previously believed; it likely mirrors or exceeds the prevalence rate in the healthy population. The morbidity and mortality of patients with coronary artery disease who undergo orthotopic liver transplantation (OLT) without treatment are unacceptably high. In conclusion, accurate preoperative cardiac evaluation according to the new American Heart Association & American College of Cardiology should lead to detect and treat coronary artery disease before liver transplantation. In case of alcohol-related cardiomyopathy, portopulmonary hypertension, and hypertrophic cardiomyopathy, there should be a case-by-case discussion by the hepatologist and cardiologist to consider the patient for liver transplantation. No robust data are available on the impact of decompensated dilated heart failure in this setting. If a recipient with cardiac disease is scheduled for OLT, we strongly suggest advanced intra- and postoperative hemodynamic monitoring plus transesophageal echocardiography.

Hemodynamics during liver transplantation.

Assessing the optimal volemia in the perioperative course of liver transplantation is a challenge for the anesthesiologist. Traditional estimates of intravascular volume status, such as pulmonary artery occlusion pressure (PAOP), have been widely shown to poorly correlate with changes in cardiac output among critically ill patients. Hence, there has been recent interest in alternative, catheter-related, bedside device volume estimates using thermodilution. Continuous end diastolic volume (CEDVI) showed better correlations with cardiac performance than cardiac filling pressures in studies performed in critically ill patients. When compared with conventional pressure-derived data, preload monitoring estimated as intrathoracic blood volume index (ITBVI) with the PiCCO system based on an integrated transpulmonary thermodilution technique better reflected left ventricular filling both in critically ill patients and those who underwent liver transplantation. Moreover, in liver transplantation, the use of transoesophageal echocardiography (TEE) has been increasing for it provides rapid visualization of the dimension and function of heart chambers as well as the left ventricular end diastolic area index (EDAI) that seem to correlate with graded acute hypovolemia, although its validity as on preload index is still under discussion.

Sedation in the critically ill patient.

Critically ill patients who require intensive care need effective analgesia and sedation to control potentially unpleasant symptoms, such as pain and anxiety. Analgesics and sedatives are also used to allow patients to tolerate nursing procedures and tracheal intubation as well as to aid mechanical ventilation. Metabolism of traditional opioids is dependent on organ function, which is abnormal among critically ill patients. The use of a score system to ensure sufficient but not excessive sedation should be mandatory. Sufentanil and remifentanil are more predictable opioids that are suitable for either sedation or analgesia in critically ill patients to achieve an adequate Ramsay score from 2 to 4.

Long-term results of in situ split-liver transplantation.

BACKGROUND: Split-liver transplantation (SLT) offers immediate expansion of the cadaver donor pool. The principal beneficiaries have been adult and pediatric recipients with excellent outcomes. This study analyzed a single-center experience of adult to adult in situ SLT in adult recipients. PATIENTS AND METHODS: Fourteen consecutive adult-to-adult in situ SLT have been performed at our institution since 1998. The extended right lobe comprising segment 1 was transplanted in to adult patients, the left lateral segment, for pediatric transplants. RESULTS: Donors of SLT were significantly younger (P = .03) than those of whole liver transplants. Survival rates of patients receiving a split liver were 83%, 73%, and 73% at 1, 3, and 5 years after the transplant respectively and grafts of 73%, 73%, and 73% for SLT and 76%, 70%, and 66% for whole liver transplants (P = .44). The rate of biliary complication after SLT was 21%, which was comparable to that after whole organ transplantation (17%). The incidence of hepatic artery thrombosis and primary nonfunction was not significantly different between split liver and whole organ transplantation performed during the same time period (7% versus 4.6% P = .67 and 7% versus 2.6% P = .32, respectively). CONCLUSION: This limited single-center experience confirmed that both early and long-term results of SLT are comparable to those of traditional whole liver organ transplantation.

Circadian variations in cyclosporine C2 concentrations during the first 2 weeks after liver transplantation.

The strategies currently used to monitor concentrations of cyclosporine (CsA) in transplanted patients include whole blood trough (C0), total or abbreviated area under the curve (AUC) concentration and population pharmacokinetic approaches. Recently, a single blood concentration measurement at 2 hours (C2) after CsA administration has been shown to be helpful to predict clinical effects during the first weeks after transplantation of liver and kidney grafts. However, this approach has raised multiple questions about pharmacokinetic variability, analytical methods, and organizational requirements. From a pharmacokinetic point of view, the variability of CsA blood concentrations may relate to circadian variations. The present study sought to characterize the circadian variation in C0 and C2 CsA levels among 20 liver transplant recipients during the first 2 weeks posttransplant. All patients received two equal oral doses of CsA microemulsion formulation every 12 hours. Blood samples were collected before and 2 hours after CsA administration in the morning (AM) and in the evening (PM). Whole blood concentrations of CsA were assayed using the monoclonal fluorescence polarization immunoassay system. During the first 2 weeks posttransplant, C2 AM mean levels were significantly higher than C2 PM levels (542 +/- 241 vs 383 +/- 182 ng/mL, P =.005), while the C0 AM mean level was not statistically different from the C0 PM (285 +/- 174 vs 223 +/- 124 ng/mL, P =.367). Our results suggest that morning CsA blood samples may afford a better approach to optimize the CsA dosage, especially based on C2 values.

Secondary migration of a central venous catheter. A case report.

A case of central venous catheter (CVC) secondary migration in a patient with Hodgkin's lymphoma is reported. The catheter was inserted in the right internal jugular vein with anterior approach. The correct position of the catheter tip in the superior vena cava was confirmed by X-ray. Secondary migration to the right subclavian vein, without displacement at the point of insertion, was reported 8 days later by a chest X-ray performed for worsening of the respiratory condition. CVC was removed and reinserted with the same procedure. The correct position of the catheter tip was confirmed by thoracic radiography till 10 days later. Epidemiological data present in the literature and secondary migration predisposing factors are reported.

Elective transumbilical compared with standard laparoscopic cholecystectomy.

OBJECTIVE: To compare the transumbilical technique of laparoscopic cholecystectomy with standard laparoscopic cholecystectomy. DESIGN: Randomised open study. SETTING: Teaching hospital, Italy. SUBJECTS: 90 patients who required elective cholecystectomy under general anaesthesia. INTERVENTIONS: Standard laparoscopic cholecystectomy through 4 ports or transumbilical cholecystectomy through 2 ports. MAIN OUTCOME MEASURES: Amount of pain and analgesia, cost, side effects, and cosmesis. RESULTS: 25 patients were excluded from analysis (8 in the standard group because relevant data were not recorded; and 17 in the transumbilical group in 4 of whom relevant data were not recorded, and 13 for technical reasons). 32 patients who had standard, and 25 who had transumbilical cholecystectomy had operative cholangiograms. There were no complications, no side effects, and no conversions to open cholecystectomy. Those who had transumbilical cholecystectomy had significantly lower pain scores (p<0.05) and required significantly less analgesia during the first 24 hours (p<0.05) than those who had standard laparoscopic cholecystectomy. CONCLUSION: Once the learning curve has been completed, transumbilical cholecystectomy is possible without some of difficulties associated with standard laparoscopic cholecystectomy.

[Postoperative epidural analgesia]. / Analgesia epidurale post-operatoria.

Epidural analgesia with local anesthetics and opioids is one of the most effective methods for postoperative pain control. In critical patients it seems to improve outcome as well as pain control. This technique works better when started in the intraoperative time. Epidural analgesia is safe on surgical wards if nursing staff is trained in managing epidural catheters and in early detection and treatment of major and minor side effects. Nursing staff cooperates with the Acute Pain Service doctors and nurses who are on call on a 24 hour basis. Many perspective and retrospective studies showed a very low incidence of major side effects with epidurals. So we can consider it safe and effective even if we consider its invasiveness.