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Biomedical subjects

F Barale

Publications and source records attributed to F Barale.

At least 37 records · Page 2Linked to original sources
PubMed1995

Effects of halothane, enflurane and isoflurane on contraction of rat aorta induced by endothelin-1.

Volatile anaesthetics induce hypotension by both indirect and direct effects; they have been reported to inhibit vasoconstriction produced by a variety of agonists. These studies were performed to see if halothane, enflurane and isoflurane attenuate endothelin-1-evoked contraction and if they interact with endothelium-dependent or -independent vasoactive substances. Rat aortic rings were suspended in aerated Krebs' solution (37 degrees C) and contracted by incremental doses of endothelin-1 5 x 10(-10) to 5 x 10(-8) mol litre-1. Volatile anaesthetics at 1 and 2 MAC were tested on endothelium intact and denuded rings. They were tested also on L-NAME incubated endothelium intact and indomethacin-incubated endothelium intact and denuded rings. Responses to endothelin-1 were compared in the presence and absence of volatile anaesthetics. Isoflurane at 1 and 2 MAC concentration, and enflurane at 2 MAC, induced a rightward shift of the dose-response curve obtained with endothelin-1 in both endothelium denuded and intact rings, associated with a decrease in maximal tension generated in the latter rings. In L-NAME-incubated endothelium intact rings and in indomethacin endothelium denuded rings, the anaesthetics induced a rightward shift of the dose-response curve without modification of maximal tension. In indomethacin-incubated endothelium intact rings there was significant attenuation of endothelin-1 contraction in control rings which was not enhanced by volatile anaesthetics in treated rings. The present study indicates that isoflurane at 1 and 2 MAC, and enflurane at 2 MAC, significantly decreased endothelin-1-induced contraction of isolated rat aorta. This inhibition was observed in both intact and denuded rings and probably involves mechanisms within the smooth muscle. Nevertheless, our results suggest that part of the anaesthetic-induced inhibition of endothelin-1-evoked vasocontraction involves an "indomethacin-like" effect on an endothelial-derived vasoconstricting cyclo-oxygenase product.

Anesthetics, Inhalation↗
PubMed1995

Effects of training on performance in competitive swimming.

The relationships between the mean intensity of a training season, training volume and frequency, and the variations in performance were studied in a group of 18 elite swimmers. Additionally, differences between the swimmers who improved their personal record of the previous year during the follow-up training season (GIR, n = 8) and those who did not (GNI, n = 10) were investigated. The improvement in performance during the follow-up season was significantly correlated with the mean intensity of the training season (r = 0.69, p < 0.01), but not with training volume or frequency. The performance improvement during the follow-up season was negatively related to the initial performance level (r = 0.90, p < 0.01). The decline in performance during detraining from the previous year was less for the GIR than for the GNI (6.21 +/- 2.30% vs. 9.79 +/- 2.18%, p < 0.01). The present findings suggest that training intensity is the key factor in performance improvement in a group of elite swimmers. Factors such as previous detraining and initial performance level could jeopardize success in spite of a good adaptation to training.

Adaptation, Physiological↗
PubMed1995

Pilot clinical trial of an anti-TNF alpha monoclonal antibody for the treatment of septic shock.

OBJECTIVE: To determine the safety and pharmacokinetics of an anti-tumour necrosis factor (TNF alpha) monoclonal antibody in the treatment of septic shock, and to evaluate the biological evolution of cytokine response. DESIGN: Open-label, prospective, pilot trial with escalating doses of a murine monoclonal antibody (B-C7) directed against TNF alpha. SETTING: University medical centre intensive care unit. PATIENTS: Nine patients with septic shock, who received standard supportive care and antimicrobial therapy in addition to the anti-TNF alpha antibody. INTERVENTIONS: Patients were treated intravenously with one of three escalating doses of B-C7 monoclonal antibody (MoAb): 0.4 mg/kg, 0.8 mg/kg, 1 mg/kg. RESULTS: MoAb was well tolerated despite the development of human anti-mouse antibodies (HAMA) for each patient; B-C7 plasma levels were dose-dependent. At study entry, TNF alpha and IL-6 levels were detected in six and seven patients respectively; IL-1 levels were low and interferon-gamma was undetectable. CONCLUSIONS: No side effects were noted during treatment regardless of the dose used; however, further studies are needed to determine the clinical efficacy of this agent in septic shock.

APACHE↗
PubMed1995

[Hemodynamic effect of intrathecal clonidine].

Intrathecal administration of bupivacaine and clonidine results in a significant prolongation of both motor and sensitive blocks but side effects-hypotension and bradycardia-are observed. We compared two groups of patients allocated randomly. One group received intrathecal bupivacaine-morphine and the other one received clonidine-bupivacaine-morphine. In the group which received clonidine a blood pressure decrease was observed from 2nd to 8th hour, independently from the sympathetic block and easily corrected by i.v. ephedrine. Some possible explanations are discussed. No complications due to clonidine were observed.

Aged↗
PubMed1994

[Angioneurotic edema and anesthesia: preparation and perioperative monitoring].

Hereditary angioneurotic oedema is an autosomal dominant disease associated with serum deficiency of functional C1-inhibitor. It is characterized by periodic swelling of subcutaneous tissues, abdominal viscera and upper airways. Lethal acute episodes of oedema can occur during anaesthesia and surgery. It is essential to prepare such patients before surgery. This article describes three cases (kidney transplantation, caesarean section, normal delivery) and the various preventive measures used to avoid acute episodes during anaesthesia and surgery. Antibrinolytic agents, androgens, fresh frozen plasma, C1-inhibitor concentrate can be administered. Their various indications are discussed.

Adult↗
PubMed1994

[Heart transplantation experience: Rorschach test five years after surgery].

This paper presents some reflections on the experience of heart transplantation on the basis of Rorschach tests, collected from fifteen patients who underwent cardiac transplantation five years before. We suggest the use of six criteria: responses to Card I; movement (M, MA, m) as a key determinant; importance of surfaces and middle line; responses to Cards IV and VI; responses to Card X; complexual response, if present. Performances show problems related to the integration of the acquired organ. This process is long and difficult but easier in those patients who succeeded in working-through the graft re-acquisition.

Adult↗
PubMed1992

[Surgery of the aortic bifurcation and heart diseases: peroperative hemodynamics].

During aorto-biiliac by-pass, patients with heart disease are exposed at many haemodynamic problems. Mixed venous oxygen saturation monitoring help anesthetist along clamping and unclamping periods. This study concerning 13 patients with pre-operative NYHA class II and III congestive heart disease, discusses therapeutic algorithm especially for choosing inotropic or vasodilatator drugs.

Aged↗
PubMed1992

[Postoperative analgesia by intrathecal morphine and respiratory depression: value of low doses (apropos of 285 cases)].

Morphine at very low dose gives a good post-operatory analgesia without major secondary effects. This study analyses retrospectively 285 spinal anaesthesia with hyperbaric 0.5% bupivacaine 0.2 mg.kg-1 and morphine 0.25 mg in adult urologic surgery. The analysis of enquiry in analgesic during the post-operatory period shows that in most cases (72%) the patients have supported the first 24 hours without any complementary analgesia; 28% of patients needs a complementary analgesia realized with 1 g of paracetamol. Intravenous morphinics have never been necessary in post-operative period. The analgesia was adequate for the patient's comfort, and it never mask a surgery complication. No respiratory complication appeared, even in 13 patients who needed intravenous morphinics in per-operative.

Adult↗
PubMed1992

[Spinal anesthesia at T12 or T10 level with hyperbaric bupivacaine 0.5%: value of determining the useful dosage according to the weight].

A retrospective study was carried out on anaesthetic records concerning spinal anaesthesia with hyperbaric bupivacaine 0.5% in urologic surgery. Three doses were utilised: slight (< 0.19 mg.kg-1), mean (0.19-0.21 mg.kg-1) or important (> 0.21 mg.kg-1) for two different levels: T12 or T10. Important doses may be involved excessive extension. Failures are perhaps more frequent with slight doses. Mean doses, 0.20 mg.kg1, seems to be recommended.

Aged↗
PubMed1991

[Pharmacological interactions between diltiazem and thiopental. A study on an electrophysiological model of guinea pig isolated papillary muscle. Value of positive inotropic agent].

This study was designed to assess in vitro the effects of Thiopental alone and Thiopental--Dobutamine association on control and on Diltiazem pretreated papillary muscle. The Diltiazem treatment do not increase the negative inotropic effect of Thiopental but the effect of Dobutamine is less important in pretreated group. The Diltiazem treatment protect to arrhythmogenic action of Thiopental and Thiopental-Dobutamine association.

Animals↗
PubMed1991

[Brachial plexus block by infraclavicular approach in children. Value of a nerve stimulator? Apropos of 20 cases].

This study included 20 children (average 8.5 years) undergoing surgery of the upper limb under brachial plexus block. A method of blocking the brachial plexus using an infraclavicular approach is described. Eighteen brachial plexus block were performed under general anesthesia. No complication was observed. Post-operative analgesia was satisfactory in all cases. In 10 cases a nerve stimulator was used. It is not necessary for the realization of a brachial plexus block, but the punction is easier under general anesthesia with this instrument.

Adolescent↗
PubMed1990

[Acute necrotizing hemorrhagic pancreatitis].

There is no etiologic treatment for acute necrotizing pancreatitis. Advances in intensive care resulted in a reduction in early death rate by a better control of systemic complications. Delayed death rate from infection is high (20-60%). Diagnostic problems are an important cause, in spite of the aid of computed tomography and echography. The prognosis will further be improved by earlier diagnosis, a better definition of surgical treatment when complications arise, and constant medicosurgical collaboration.

Acute Disease↗
PubMed1990

[Calorimetric study of enteral low-carbohydrate diet in patients with respiratory insufficiency and decompensation].

Standard artificial feeding is not suitable for patients with acute respiratory failure due to the increase in CO2 production it entails, effect of carbohydrate metabolism. Randomized use of an enteral diet comprising 55% of fats in 10 patients with chronic pulmonary disease during an acute phase, receiving mechanical ventilatory support, achieved a rapid decrease of VCO2 value, 243 to 215 ml.min-1, while it increased to 250 ml.min-1 with the control diet. These variations are metabolic and not ventilatory in origin for they are not accompanied by changes in plasmatic total CO2 rate.

Blood Gas Analysis↗
PubMed1990

[Pediatric anesthesia and pharmacokinetics of propofol administered at a constant rate].

The pharmacokinetic properties of propofol given at a constant rate, were studied in 10 children. Propofol was administered at a dose according to I.C.I. Pharma advices. For minor surgery, a low quality of general anesthesia was observed in correlation with low plasma levels of propofol. An increase in dosage would be necessary in children above 8 years old.

Adolescent↗
PubMed1990

[Epidural anesthesia in pediatrics. Apropos of 30 cases].

Continuous epidural anesthesia was carried out in 30 children aged from 2 months to 15 years (12 are less than 5 years old) and scheduled for long surgical procedure (thoracic, abdominal or urologic procedures). The epidural space was punctured under general anesthesia on a midline approach with a saline filled syringe. The catheter is easily inserted and fixed. 28 are inserted before surgery; 2 at the end of procedure. The local anesthesia used was lidocaine 1% (with 1/200,000 epinephrine) and/or bupivacaine 0.5 alone or mixed; bupivacaine wasn't used for children aged less than 6 months. During surgery, complete sensory blockade was obtained in 26 cases; insufficient analgesia or lateralization of the block in the 2 other cases. Complete muscle paralysis, researched for 17 children, was altered for 11 patients. The insufficient was observed in upper abdominal surgery for which etidocaine was used unless the patient is aged less than 6 months (in this case lidocaine 2% was preferred). As complications, a dural penetration was observed in a child aged 2 months, and an hemodynamic instability for another patient for which 100 ml albumin was used. In the post operative period, the catheter remained in situ from 24 to 48 hours, provide safe and effective analgesia and therefore eased the management of the children.

Adolescent↗