External validation of the Revised Cardiac Risk Index and National Surgical Quality Improvement Program Myocardial Infarction and Cardiac Arrest calculator in noncardiac vascular surgery.

BACKGROUND: The National Surgical Quality Improvement Program Myocardial Infarction & Cardiac Arrest (NSQIP MICA) calculator and the Revised Cardiac Risk Index (RCRI) were derived using currently outdated methods of diagnosing perioperative myocardial infarctions. We tested the external validity of these tools in a setting of a systematic perioperative cardiac biomarker measurement. METHODS: Analysis of routinely collected data nested in the Vascular Events In Noncardiac Surgery Patients Cohort Evaluation Study. A consecutive sample of patients ≥45 yr old undergoing in-hospital noncardiac surgery in a single tertiary care centre was enrolled. The predictive performance of the models was tested in terms of the occurrence of major cardiac complications defined as a composite of a nonfatal myocardial infarction, a nonfatal cardiac arrest, or a cardiac death within 30 days after surgery. The plasma concentration of high-sensitivity troponin T was measured before surgery, 6-12 h after operation, and on the first, second, and third days after surgery. Myocardial infarction was diagnosed according to the Third Universal Definition. RESULTS: The median age was 65 (59-72) yr, and 704/870 (80.9%) subjects were male. The primary outcome occurred in 76/870 (8.7%; 95% confidence interval [CI], 6.9-10.8%) patients. The c-statistic was 0.64 (95% CI, 0.57-0.70) for the NSQIP MICA and 0.60 (95% CI, 0.54-0.65) for the RCRI. Predicted risks were systematically underestimated in calibration belts (P<0.001). The RCRI and the NSQIP MICA showed no clinical utility before recalibration. CONCLUSIONS: The NSQIP and RCRI models had limited predictive performance in this at-risk population. The recently updated version of the RCRI was more reliable than the original index.

Patient coping and expectations predict recovery after major orthopaedic trauma.

BACKGROUND: Persistent post-surgical pain and associated disability are common after a traumatic fracture repair. Preliminary evidence suggests that patients' beliefs and perceptions may influence their prognosis. METHODS: We used data from the Fluid Lavage of Open Wounds trial to determine, in 1560 open fracture patients undergoing surgical repair, the association between Somatic PreOccupation and Coping (captured by the SPOC questionnaire) and recovery at 1 yr. RESULTS: Of the 1218 open fracture patients with complete data available for analysis, 813 (66.7%) reported moderate to extreme pain at 1 yr. The addition of SPOC scores to an adjusted regression model to predict persistent pain improved the concordance statistic from 0.66 to 0.74, and found the greatest risk was associated with high (≥74) SPOC scores [odds ratio: 5.63; 99% confidence interval (CI): 3.59-8.84; absolute risk increase 40.6%; 99% CI: 30.8%, 48.6%]. Thirty-eight per cent (484 of 1277) reported moderate to extreme pain interference at 1 yr. The addition of SPOC scores to an adjusted regression model to predict pain interference improved the concordance statistic from 0.66 to 0.75, and the greatest risk was associated with high SPOC scores (odds ratio: 6.06; 99% CI: 3.97-9.25; absolute risk increase: 18.3%; 95% CI: 11.7%, 26.7%). In our adjusted multivariable regression models, SPOC scores at 6 weeks post-surgery accounted for 10% of the variation in short form-12 physical component summary scores and 14% of short form-12 mental component summary scores at 1 yr. CONCLUSIONS: Amongst patients undergoing surgical repair of open extremity fractures, high SPOC questionnaire scores at 6 weeks post-surgery were predictive of persistent pain, reduced quality of life, and pain interference at 1 yr. CLINICAL TRIAL REGISTRATION: NCT00788398.

The ASOS Surgical Risk Calculator: development and validation of a tool for identifying African surgical patients at risk of severe postoperative complications.

BACKGROUND: The African Surgical Outcomes Study (ASOS) showed that surgical patients in Africa have a mortality twice the global average. Existing risk assessment tools are not valid for use in this population because the pattern of risk for poor outcomes differs from high-income countries. The objective of this study was to derive and validate a simple, preoperative risk stratification tool to identify African surgical patients at risk for in-hospital postoperative mortality and severe complications. METHODS: ASOS was a 7-day prospective cohort study of adult patients undergoing surgery in Africa. The ASOS Surgical Risk Calculator was constructed with a multivariable logistic regression model for the outcome of in-hospital mortality and severe postoperative complications. The following preoperative risk factors were entered into the model; age, sex, smoking status, ASA physical status, preoperative chronic comorbid conditions, indication for surgery, urgency, severity, and type of surgery. RESULTS: The model was derived from 8799 patients from 168 African hospitals. The composite outcome of severe postoperative complications and death occurred in 423/8799 (4.8%) patients. The ASOS Surgical Risk Calculator includes the following risk factors: age, ASA physical status, indication for surgery, urgency, severity, and type of surgery. The model showed good discrimination with an area under the receiver operating characteristic curve of 0.805 and good calibration with c-statistic corrected for optimism of 0.784. CONCLUSIONS: This simple preoperative risk calculator could be used to identify high-risk surgical patients in African hospitals and facilitate increased postoperative surveillance. CLINICAL TRIAL REGISTRATION: NCT03044899.

Prospective observational study of the effect of dual antiplatelet therapy with tranexamic acid treatment on platelet function and bleeding after cardiac surgery.

BACKGROUND: The bleeding impact of dual antiplatelet therapy (DAPT), aspirin and clopidogrel, maintained until coronary artery bypass graft surgery (CABG), is still a matter of debate. The lack of preoperative antiplatelet activity measurement and heterogeneity of antifibrinolytic protocols in prior studies make the conclusions questionable. The aim of this prospective study was to determine, after preoperative antiplatelet activity measurement, if the maintenance of DAPT until CABG increases bleeding in patients treated with tranexamic acid (TA). METHODS: This observational study included 150 consecutive patients, 89 treated with aspirin and 61 treated with DAPT, undergoing a first-time planned on-pump CABG with TA treatment. Antiplatelet activity was measured with platelet aggregation tests and quantification of VASP phosphorylation. Postoperative bleeding at 24 h was recorded and propensity score analysis was performed. RESULTS: Based on VASP assay, 54% of patients showed high on-clopidogrel platelet activity inhibition. Postoperative bleeding at 24 h increased by 22% in the DAPT group, compared with the aspirin group (680 [95% CI: 360-1670] vs 558 [95%CI: 267-1270] ml, P < 0.01), consistent with increased blood transfusion (21% vs 7%, P = 0.01); a higher incidence of mediastinitis did not reach statistical significance (15% vs 4%, P = 0.05). Bleeding correlated with the extent of clopidogrel antiplatelet effect, with the best correlation for the VASP assay. CONCLUSIONS: Maintenance of DAPT until the day of CABG in patients treated with TA, increased postoperative bleeding at 24 h in parallel with preoperative antiplatelet activity induced by clopidogrel.

First closed-loop goal directed fluid therapy during surgery: a pilot study.

OBJECTIVE: Intraoperative haemodynamic optimization based on fluid management and stroke volume optimization (Goal Directed Fluid Therapy [GDFT]) can improve patients' postoperative outcome. We have described a closed-loop fluid management system based on stroke volume variation and stroke volume monitoring. The goal of this system is to apply GDFT protocols automatically. After conducting simulation, engineering, and animal studies the present report describes the first use of this system in the clinical setting. STUDY DESIGN: Prospective pilot study. PATIENTS: Patients undergoing major surgery. METHODS: Twelve patients at two institutions had intraoperative GDFT delivered by closed-loop controller under the direction of an anaesthesiologist. Compliance with GDFT management was defined as acceptable when a patient spent more than 85% of the surgery time in a preload independent state (defined as stroke volume variation<13%), or when average cardiac index during the case was superior or equal to 2.5l/min/m(2). RESULTS: Closed-loop GDFT was completed in 12 patients. Median surgery time was 447 [309-483] min and blood loss was 200 [100-1000] ml. Average cardiac index was 3.2±0.8l/min/m(2) and on average patients spent 91% (76 to 100%) of the surgery time in a preload independent state. Twelve of 12 patients met the criteria for compliance with intraoperative GDFT management. CONCLUSION: Intraoperative GDFT delivered by closed-loop system under anaesthesiologist guidance allowed to obtain targeted objectives in 91% of surgery time. This approach may provide a way to ensure consistent high-quality delivery of fluid administration and compliance with perioperative goal directed therapy.

Central venous saturation is not an alternative to mixed venous saturation during cardiopulmonary bypass in coronary artery surgery patients.

BACKGROUND: To evaluate the correlation and agreement between central venous saturation (ScvO(2)) and mixed venous saturation (SvO(2)) during cardiopulmonary bypass. METHODS: Twenty-two consecutive patients scheduled for coronary artery surgery were prospectively included. Paired measurements of ScvO(2) and SvO(2) were performed 5 minutes after aortic cross-clamping, after each cardioplegia dose and after de-clamping of the aortic cross-clamp. ScvO(2) and SvO(2) were measured, respectively, by a fibreoptic catheter in the superior vena cava and on blood samples from the venous return line of the extracorporeal circuit, using a blood gas analyser RESULTS: Ninety-five paired measurements of venous saturation were obtained. Correlation between the measurements was associated with an r = 0.55. The mean bias was 2.2 [Limits of agreement: -13.6%, +18%]. Changes in oxygen saturation over time showed an r = 0.4 and a mean bias of 0.2 [Limits of agreement: -17.9%, +18.3%]. Multivariate analysis identified the oxygen consumption index as the only factor explaining this variability. CONCLUSIONS: Although mean biases between the measurements were low, limits of agreement were too large to provide a clinically acceptable estimation of SvO(2) by ScvO(2) in these conditions. Variations in regional oxygen consumption seem to be the main factor worsening the relationship.

Drug-eluting stent thrombosis in patients undergoing non-cardiac surgery: is it always a problem?

BACKGROUND: Recent publications have reported high incidence of perioperative complications in patients with drug-eluting stent (DES). The recommendations for bare-metal stents (BMS) are not applicable to DES. In fact, large evidence-based studies are lacking on which to base a consensus for the perioperative management of patients with DES. The aim of the present study is to evaluate the postoperative cardiac risk associated with DES. METHODS: Prospectively collected data were examined for the rate of postoperative cardiac complications in 96 consecutive patients with DES who underwent digestive, urologic, orthopaedic, or vascular surgery. The average delay between revascularization and non-cardiac surgery was 14 (11) months (extremes 1 week and 36 months). The occurrence of postoperative troponin release (troponin I > or =0.15 ng ml(-1)) and the rate of in-stent thrombosis were analysed. RESULTS: Twelve patients (12%) presented a postoperative troponin release, without EKG abnormalities in 10 cases (83%). Two patients (2%) developed an in-stent thrombosis. None of the patients had excessive postoperative blood loss. CONCLUSIONS: Patients with DES are at higher risk of postoperative cardiac complications. Nevertheless, the specific thrombotic complications of the DES were uncommon in this series and this is in contrast to previous alarming reports. A balanced perioperative management of anti-platelet agents, considering both risk for bleeding and risk of thrombotic complications, in patients with DES, is associated with a low risk of thrombosis in the postoperative period. The rate of cardiac complications remains high in these patients due to co-morbidities.

Anaphylaxis to rocuronium.

Reports about anaphylactic and anaphylactoid reactions to rocuronium have increased recently. We report two new cases of documented grade III anaphylaxis, leading to death in one patient. The first case occurred in an 81-year-old ASA II woman scheduled for emergency abdominal surgery. Severe hypotension and tachycardia were observed after rocuronium, without bronchospasm. Neosynephrine allowed rapid resuscitation, and the patient recovered fully. The second patient was a 64-year-old ASA II man scheduled for abdominal surgery. Severe haemodynamic instability and bronchospasm occurred after rocuronium. Despite immediate life support, the postoperative period was complicated by persistent low systolic pressure, acute respiratory distress syndrome, acute renal failure, disseminated intravascular coagulation and pancreatitis, leading to the death of the patient.

Complications of percutaneous tracheostomy.

Percutaneous tracheostomy is a technique that, reputedly, is simple to perform and causes few complications. It is routinely used in intensive care. We present two patients with tracheal stenosis. In one patient, we had to perform an anastomotic resection to cure the patient; in the other patient, we had to place an endoluminal conformer. To our knowledge, this complication has not been reported in association with the use of this technique.

[Treatment of acute colonic pseudoobstruction (Ogilvie's syndrome) by cisapride]. / Traitement de la pseudo-occlusion colique aiguë (syndrome d'Ogilvie) par le cisapride.

A case is reported of a 68-year-old woman admitted in the ICU for acute exacerbation of a chronic obstructive respiratory disease. The trachea was intubated and the lungs ventilated mechanically. She received sedation including midazolam and phenoperidine 1 mg.h-1. On the 6th day, she experienced a massive colonic dilation (caecal diameter of 10 cm at X-ray examination). A colonoscopy was performed which showed the absence of obstruction, confirmed the diagnosis of pseudo-obstruction of the colon and allowed a decompression which was inefficient. A new colonoscopic decompression was performed on the 8th day, without prolonged effect. At that time, the patient was given cisapride in her gastric tube (80 mg). This treatment restarted the bowel movements within 48 hours and the caecal diameter decreased immediately to 7 cm. Cisapride was maintained for 10 days and mechanical ventilation for 30 days. No further dilation occurred during this time and the patient was discharged from the ICU. Few cases of Ogilvie's syndrome successfully treated with cisapride have been reported in the literature. The efficacy of this agent for the treatment of Ogilvie's syndrome remains to be assessed in a controlled study.

[The value and limitations of autotransfusion in traumatology]. / Intérêt et limites de l'autotransfusion en traumatologie.

29 autotransfusions were realised in severe cases of trauma (20% of a sample of 143 traumatic emergencies). The recovery of haemothorax blood as well as the peroperative collection by a Cell Saver allowed the retransfusion of 1989 +/- 1,838 ml (225-7070 ml) of autologous blood, amounting to 56% of the average blood loss. A total of 69% of the patients received homologous blood. Eight patients (where the haemorrhage amounted to 143% of the blood volume) showed some coagulation troubles. Autotransfusion assures the immediate availability of blood while reducing the immunological and viral transfusion risks. Therefore haemothorax autotransfusion should be used systematically. Peroperative recollection by a cell-separator works well but is technically more tedious.

[Methods of reducing peroperative bleeding]. / Méthodes de réduction du saignement peropératoire.

The reduction of bleeding during surgery can be aimed at for two reasons: to facilitate the operation by providing a bloodless field and/or to avoid blood loss requiring compensation by transfusion. These aims can be reached by reducing blood pressure or by acting on blood-clotting. For inducing hypotension sodium nitroprussiate and isoflurane are mainly used. Complex and precise monitoring is required for patient safety. Two drugs have been used to diminish bleeding: desmopressin and aprotinin. With the latter an important reduction (40 to 50%) of the blood loss has been achieved.