Continuous epidural infusion of ropivacaine for postoperative analgesia after major abdominal surgery: comparative study with i.v. PCA morphine

We have compared the quality of three regimens of postoperative analgesia (continuous epidural administration of ropivacaine (Ropi. group), epidural ropivacaine and patient-controlled analgesia (PCA) with i.v. morphine (Ropi. + PCA group) and PCA morphine alone (PCA group)) during the first postoperative 24 h in a multicentre, randomized, prospective study. Postoperative analgesia was studied in 130 patients after major abdominal surgery performed under general anaesthesia. The ropivacaine groups received 20 ml of epidural bolus ropivacaine 2 mg ml-1 via the epidural route at the end of surgery, followed by continuous infusion of 10 ml h-1 for 24 h. The Ropi. + PCA group also had access to i.v. PCA morphine 1 mg, with a 5-min lockout. The PCA group received morphine as the sole postoperative pain treatment. The two ropivacaine groups had lower pain scores (P < 0.01) than the PCA group. Morphine consumption was higher in the PCA group (P < 0.05) than in the two ropivacaine groups. The quality of pain relief was rated as good or excellent in 79-85% of patients in the three groups. The percentage of patients without motor block increased between 4 and 24 h from 61% to 89% in the Ropi. group, and from 51% to 71% in the Ropi. + PCA group.      

Carotid plaque, arterial stiffness gradient, and remodeling in hypertension

The analysis of plaque mechanics along the longitudinal axis (bending strain) may provide useful information because repetitive bending strain of an atherosclerotic plaque can fatigue the wall material and result in plaque rupture. Whether essential hypertension is associated with a specific pattern of bending strain has not yet been determined. The study included 92 patients with an atherosclerotic plaque on the common carotid artery: 66 patients with essential hypertension, either treated or not, and 26 normotensive patients. A novel noninvasive echotracking system (ArtLab; Esaote, The Netherlands) was used to measure intima-media thickness, diameter, and distensibility at 128 sites on a 4-cm-long carotid segment. Carotid plaque was either less elastic than adjacent carotid artery (inward strain) or more elastic (outward strain). Inward strain was more frequently associated with an inward plaque remodeling, whereas an outward strain was more frequently associated with an outer remodeling. In multivariate logistic regression analysis, patients with essential hypertension were more likely to exhibit an inward strain of carotid plaque (odds ratio=6.9 [1.4 to 34.9]; P<0.02), independently of 2 factors favoring inward strain: an outer remodeling (odds ratio=4.6 [1.7 to 13.4]; P<0.005) and the absence of renin-angiotensin system blockers (odds ratio=4.8 [1.1 to 20.4]; P<0.05). In conclusion, arterial wall material of hypertensive patients was less elastic at the site of the plaque than upstream, and carotid was inwardly strained in the zone affected by plaque. This may generate a high level of stress concentrations and fatigue, exposing the plaque to a greater risk of rupture.     

Evaluation of a hypertension-based patient education program in a stroke center

Background The benefits of educational programs are recognized in chronic diseases. An education program was designed in our hospital, for hypertensive patients after an acute episode of stroke to prevent stroke recurrence. Objective Evaluate the effects of such program on patient knowledge and blood pressure management. Setting The 12-bed stroke center of the Groupe Hospitalier Paris Saint-Joseph, France. Method An individual educational session was provided to all the patients by the pharmacist a few days after admission. The effectiveness of the session was evaluated using a questionnaire completed by each patient before and after education. The patients had to identify the correct responses and to judge their answer’s self-confidence. The answers were ranked based on their accuracy and the surety of the respondent. Reported medication adherence and self-measurement of blood pressure were analyzed as part of the survey. Patient satisfaction with the intervention was also measured by means of a separate questionnaire. Main outcome measure Evolution of response correctness and self-confidence as well as medication adherence and blood pressure self-measurement practice. Results 64 patients were enrolled. Correct response rate increased from 77.9 to 94.1% and the absolutely sure response rate raised from 52.9 to 80.8%. Patient self-confidence was improved mainly for correct responses. Patients reported a better medication adherence and a more frequent practice of blood pressure self-measurement. They were highly satisfied. A negative correlation was found between knowledge evolution and baseline knowledge. Conclusion Education can improve stroke patient knowledge, which may enhance medication adherence and blood pressure control. Such programs should be developed even early after a stroke.     

Cost-effectiveness of propofol anesthesia using target-controlled infusion compared with a standard regimen using desflurane.

The cost-effectiveness of propofol anesthesia using target-controlled infusion (TCI) versus a standard regimen using desflurane for anesthesia maintenance was analyzed. This observational study consisted of 100 inpatients 18 to 75 years old with an American Society of Anesthesiologists physical status of I or II who were scheduled for otological surgery lasting less than four hours. Patients received one of two treatments. The desflurane-maintenance group received propofol 2-4 mg/kg and sufentanil 0.15-0.30 microg (as the citrate)/kg. A constant fresh gas flow of 1 L/min was used during maintenance of anesthesia. The propofol-maintenance group received TCI propofol and an additional infusion of sufentanil. Anesthesia was induced with 0.15-0.30 microg/kg. One blinded evaluator assessed the postoperative recovery from anesthesia for all patients. The cost of drugs and medical devices used during the intraoperative and postoperative periods was calculated. Effectiveness was defined as the absence of postoperative nausea and vomiting (PONV), while the cost-effectiveness of each procedure was the cost per PONV-free episode. The efficiency of each procedure represented the production of effectiveness per dollar invested. Chi-square and t tests, sensitivity analysis, and logistic regression were also performed. The only intergroup difference detected was the frequency of PONV occurring in the early recovery phase (11 in the desflurane group versus 2 in the propofol group). Of those patients requiring antiemetic rescue, 9 were in the desflurane group and only 2 were in the propofol group (p < 0.05). The TCI propofol regimen was more expensive than the desflurane regimen ($45 versus $28 per patient, respectively) (p < 0.001). The differential cost-effectiveness ratio was $94.7 per PONV-free episode. PONV 24 hours after surgery and patient satisfaction were similar between groups. A standard regimen of desflurane was more cost-effective than TCI propofol for anesthesia maintenance in achieving PONV-free episodes.     

Role of nitric oxide and cyclooxygenase pathways in the coronary vascular effects of halothane, isoflurane and desflurane in red blood cell-perfused isolated rabbit hearts

Background. The coronary vascular endothelium could mediatesome of the coronary effects of halogenated anaesthetic agents.The role of the endothelial vasodilator substances nitric oxide(NO) and prostaglandins (PGs) in the coronary effects of halothaneand isoflurane remains to be determined and has not been investigatedfor desflurane. In this study, the roles of NO and cyclooxygenasepathways in the coronary effects of halothane, isoflurane anddesflurane were studied in isolated red blood cell-perfusedrabbit hearts. Methods. Rabbit hearts were perfused by a Langendorf techniquewith red blood cells mixed with modified Krebs–Henseleitbuffer. Coronary blood flow (CBF), oxygen consumption and myocardialperformance were evaluated during exposure to 0.5, 1 and 2 rabbitminimum alveolar concentrations of halothane, desflurane andisoflurane. Thereafter, the same protocol was applied with theaddition of N^G-nitro-L-arginine (L-NNA), indomethacin or a combinationof both inhibitors. Results. Similar and significant increases in CBF were observedwith increasing concentrations of isoflurane and desflurane.In contrast, CBF did not change with halothane. The combinationof the two antagonists abolished desflurane-induced vasodilation,whereas it did not change the isoflurane-mediated increase inCBF. Halothane-induced vasoconstriction was observed in thepresence of a combination of indomethacin with L-NNA. Conclusions. Halothane and desflurane induce the release ofvasodilating prostaglandins and NO in rabbit coronary arteries.In contrast, these mediators are not involved in the coronaryvasodilating properties of isoflurane. Br J Anaesth 2002; 88: 399–407