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Biomedical subjects

M Pierrot

Publications and source records attributed to M Pierrot.

At least 19 recordsLinked to original sources

[Invasive pulmonary aspergillosis complicating septic shock].

INTRODUCTION: Invasive pulmonary aspergillosis (IPA) is an opportunistic infection with a poor prognosis, occurring primarily in patients who are severely immunocompromised. CASE REPORT: We report a case of IPA that occurred in a 37-year-old woman with no history of previous immunosuppression or significant co-morbidity. She was admitted to our intensive care unit (ICU) with septic shock and multi-organ failure complicating a bacterial pneumonia. After an initial improvement, her condition deteriorated on the 10th day after admission with fever and lesions consistent with IPA seen on high-resolution computed tomography (HRCT). IPA was confirmed by isolating Aspergillus fumigatus from bronchoalveolar lavage and by a positive circulating galactomannan test (sandwich ELISA). First line therapy with voriconazole had to be stopped after 12 days due to hepatic toxicity. The patient was successfully treated with caspofungine for 2 months then itraconazole for 4 months with progressive improvement of HRCT abnormalities. Her galactomannan test became negative at 6 months. CONCLUSION: The diagnosis of IPA must be considered in critically ill patients even in the absence of underlying immunosupression where suggestive HRCT abnormalities occur in the context of septic shock and multiple organ failure.

Adult↗

[Complexation du 2-[(5-méthylpyrazolyl)méthyle]benzimidazole par les chlorures de cuivre et de cadmium].

The structures of dichloro[2-[(5-methyl-1H-pyrazol-3-yl-kappaN(2))methyl]-1H-1,3-benzimidazole-kappaN(3)]copper(II), [CuCl(2)(C(12)H(12)N(4))], and di-mu-chloro-bis(chloro[2-[(5-methyl-1H-pyrazol-3-yl-kappaN(2))methyl]-1H-1,3-benzimidazole-kappaN(3)]cadmium(II)), [Cd(2)Cl(4)(C(12)H(12)N(4))(2)], show that these compounds have the structural formula [ML(Cl)(2)](n), where L is 2-[(5-methylpyrazolyl)methyl]benzimidazole. When M is copper, the complex is a monomer (n = 1), with a tetrahedral coordination for the Cu atom. When M is cadmium (n = 2), the complex lies about an inversion centre giving rise to a centrosymmetric dimer in which the Cd atoms are bridged by two chloride ions and are pentacoordinated.

English Abstract↗

[The impact of a French guideline on the clinical management of severe head injury (SHI) published in 1999].

OBJECTIVE: To evaluate the impact of a French guideline on the clinical management of severe head injury (SHI) published in 1999. STUDY DESIGN: Nationwide survey. METHODS: 182 medical centres answered the inquiry. RESULTS: 111 centres declared to manage such patients suffering from SHI. 68% of doctors from these clinical departments did report to have read these guidelines. Fifty percent of them found in these guidelines useful data for their clinical practice. Forty four percent of centres could not monitor ICP lacking neurosurgical facility in their hospital. Conversely, all hospitals with neurosurgery available did monitor ICP. Seventy six percent of centres reported difficulties to find a facility, which would take these patients in charge when discharged from ICU. We analysed the main items included in the guidelines and report their impact. Seventy four percent of responders found that clinical management of SHI patients had improved during the last years. CONCLUSION: The French guidelines had a significant impact and seem to have provided a useful aid to clinical management of SHI patients. ICP monitoring and the shortage in post-ICU facilities are remaining issues.

Craniocerebral Trauma↗

Ethyl 5-[2-(2-aminophénylimino)-2-phényléthylidène]-4-(4-chlorophényl)-4,5-dihydro-1,3,4-thiadiazole-2-carboxylate et éthyl 5-[2-[2-(méthylamino)phénylimino]-2-phényléthylidène]-4-(4-nitrophényl)-4,5-dihydro-1,3,4-thiadiazole-2-carboxylate.

Condensation of N-aryl-C-(ethoxycarbonyl)nitrilimines with 4-phenyl-1,2-dihydro-3H-1,5-benzodiazepine-2-thione lead to the title compounds, C(25)H(21)ClN(4)O(2)S, (IIIa), and C(26)H(23)N(5)O(4)S, (IIIb), respectively. Crystals of both compounds were obtained by evaporation of ethanol solutions at room temperature. In the structures of both compounds, a non-bonding interaction is observed between the S atom and the imino N atom. It is established that 1,3-dipolar cycloaddition occurs on the C=S double bond of the 1,5-benzodiazepine-2-thione.

Journal Article↗

(1S,3R,8S,9S,10R)-2,2-Dichloro-9,10-epoxy-3,7,7,10-tetramethyltricyclo[6.4.0.0(1,3)]dodecane and (1S,3R,8S,10R)-2,2-dichloro-3,7,7,10-tetramethyltricyclo[6.4.0.0(1,3)]dodecan-9-one.

The stereochemistries of the title compounds, both C(16)H(24)Cl(2)O, have been established by X-ray diffraction. In both structures, the seven-membered ring adopts the same conformation, whereas the six-membered ring shows an envelope conformation in the epoxydodecane structure and a boat conformation in the dodecan-9-one structure.

Bridged-Ring Compounds↗

A stereospecific synthesis of oxazolinyloxiranes.

Lithiooxiranes 3a and 3b, generated by deprotonation of oxiranes 2a and 2b with s-BuLi at -100 degrees C in Et(2)O, were found to be chemically very stable. trans-Lithiooxirane 3a was also configurationally stable and reacted stereospecifically with electrophiles to give 4a--k. In contrast, cis-lithiooxirane 3b was found to be configurationally much less stable and reacted with electrophiles affording mixtures of diastereomers 4, 7, and 8. After only a very short reaction time, 3b too reacted with electrophiles highly stereospecifically. Deprotonation--deuteration and deprotonation--alkylation of chiral oxazolinyloxiranes 12a and 12b to give oxiranes 12c and 12d were also examined. Semiempirical and ab initio calculations were carried out in an effort to explain the observed stereochemistry.

Journal Article↗

2-Acetyl-4H-benzothiazin-3(2H)-one.

The title compound, C(10)H(9)NO(2)S, has a boat-shaped heterocyclic six-membered ring such that the S and N atoms lie essentially in the plane of the benzene ring while the remaining two C atoms are above this plane.

Journal Article↗

[Intoxications by hallucinogenic mushrooms].

In the context of excessive use of natural or synthetic psychoactive substances, with stimulating, psychedelic and hallucinogenic effects, an increase, if not a recurrence, in consumption of Psilocybe semilanceata has been observed in France over some fifteen years. Psilocybin and psilocin are the active compounds, responsible for the hallucinogenic effects and are a part of the substance group, derived from tryptamine and characterized by an indole nucleus. We report a clinical case observed in an emergency unit and review the historical, epidemiological and pharmacological data now available for these intoxications. Of particular interests in hallucinogenic mushroom abuse are: increased consumption in the context of youth cultural and entertainment movements; possible difficulties in the diagnosis in emergency conditions; possibility of severe and fatal complications.

Adult↗

Correlation between cerebral oxygen saturation measured by near-infrared spectroscopy and jugular oxygen saturation in patients with severe closed head injury.

UNLABELLED: Near-infrared spectroscopy has been used to monitor cerebral oxygen saturation during cerebral circulatory arrest and carotid clamping. However, its utility has not been demonstrated in more complex situations, such as in patients with head injuries. The authors tested this method during conditions that may alter the arteriovenous partition of cerebral blood in different ways. METHODS: The authors compared changes in measured cerebral oxygen saturation and other hemodynamic parameters, including jugular venous oxygen saturation, in nine patients with severe closed head injury during manipulation of arterial carbon dioxide partial pressure and after mean arterial pressure was altered by vasopressors. RESULTS: The Bland and Altman representation of cerebral oxygen saturation versus jugular oxygen saturation showed a uniform scatter. Values for changing arterial carbon dioxide partial pressure were: bias = 1.1%, 2 SD = +/-21%, absolute value; and those for alterations in mean arterial pressure: bias = 3.7%, 2 SD = +/-24%, absolute value. However, a Bland and Altman plot of changes in cerebral oxygen saturation versus changes in jugular oxygen saturation had a negative slope (alteration in arterial carbon dioxide partial pressure: bias = 2.4%, 2 SD = +/-17%, absolute value; alteration in mean arterial pressure: bias = -4.9%, 2 SD = +/-31%, absolute value). Regression analysis showed that changes in cerebral oxygen saturation were positively correlated with changes in jugular venous oxygen saturation during the carbon dioxide challenge, whereas correlation was negative during the arterial pressure challenge. CONCLUSIONS: Cerebral oxygen saturation assessed by near-infrared spectroscopy does not adequately reflect changes in jugular venous oxygen saturation in patients with severe head injury. Changes in arteriovenous partitioning, infrared-spectroscopy contamination by extracerebral signal, algorithm errors, and dissimilar tissue sampling may explain these findings.

Administration, Inhalation↗

[Interactions between naltrexone, an opioid antagonist, and opioids administered during general anesthesia].

We report a case of a probable interaction between sufentanil and naltrexone, an oral long acting opioid antagonist, prescribed for maintenance of abstinence in alcoholics and opioid addicts. The interaction resulted in an antagonisation of the effects of sufentanil and the necessity to increase the dosage. Anaesthetists should be aware of this potential drug interaction.

Alcoholism↗

New approaches to chromatographic purification of bovine dopamine-beta-hydroxylase.

The use of the traditional scheme for the isolation of bovine dopamine-beta-hydroxylase (bDBH) from bovine adrenal medulla resulted in active but not pure bDBH, containing about 50% of admixtures. Immobilized metal chelate affinity chromatography on agarose modified with iminodiacetic acid residues and charged with cobalt ions was applied in the final stage to obtain more than 90% pure and active bDBH. Final purification of bDBH using step elution with 0-0.5 M methyl-D-mannoside in buffer solution from concanavalin A-Sepharose was studied. The determination of bDBH in various samples was performed using size-exclusion chromatography.

Adrenal Medulla↗

Regional ventricular segmental dynamics in normal conscious dogs.

Left ventricular (LV) subendocardial segmental behavior was analyzed during the whole cardiac cycle for different loading and inotropic conditions in six conscious dogs that were instrumented with ultrasonic crystals in the basal (B) and apical (A) LV regions, a LV micromanometer, and an aortic cuff occluder. There were large variations of A and B segmental behavior during isovolumic contraction and relaxation. In contrast, a linear relationship between A and B was observed during ejection but segmental shortening was larger during control in A than in B, whether it was expressed as a percentage of systolic shortening (34.6 +/- 1.1 and 25.0 +/- 1.2%, respectively; P less than 0.005), or whether segments were normalized for passive resting length. This linear relationship during ejection with a slope of 1.49 was not significantly modified by alterations of loading conditions or inotropic state. The larger A than B shortening, independent of the normalization procedure, is attributed to the regional stress distribution in the LV. The absence of regional and cycle invariance particularly during isovolumic phases prevents the inference of ventricular volume from a limited number of dimensions.

Animals↗

[Human fibronectin in the treatment of septic states. Tolerance and course of plasma levels].

A purified freeze-dried fibronectin concentrate prepared by the Centre National de Transfusion Sanguine from blood donors' plasma pools was tested for safety and effects on recipients' plasma fibronectin levels. The product was administered on 17 occasions to 10 patients with severe sepsis, either as bolus intravenous injection (group B) or as bolus injection of one-half of the dose followed by continuous infusion of the remaining half-dose over a 6-hour period (group B + P). The drug was well tolerated both clinically and biochemically. Following a 1 mg/kg dose of fibronectin, the maximum increase in mean plasma fibronectin levels was 17 +/- 5 mg/l in group B patients and 20 +/- 5 mg/l in group B + P patients. Mean times to peak were 188 +/- 53 min and 282 +/- 106 min respectively in the two groups. A cooperative randomized double-blind trial is currently in progress to evaluate the clinical effectiveness of the product.

Adult↗

[Physiology of nodal tissue and effect of products used in anesthesia].

The three fundamental properties of the nodal tissue, i.e.: excitability, automaticity and conduction of the depolarisation wave, are directly dependent on ionic transmembrane currents. These currents, either active or passive, determine the characteristics of the membrane action potential. Passive ionic movements cross gated transmembrane channels which activation is voltage-dependent, sometimes time-dependent and, for Ca2+ channels, dependent on intra-cellular cyclic AMP content. Both intra and extra-cellular ionic concentrations (K+, Ca2+, Mg2+) alter these passive movements. Active ionic movements require ATP hydrolysis and depend only on cellular metabolism. The neurovegetative system and its transmitters modulate the nodal tissue function altering passive ionic currents. Drugs employed during anesthesia change this function either by direct action on the ionic currents or by indirect action on the neurovegetative system or on histamine liberation. Thus: local anesthetics block selectively fast sodium channels; halogenated volatile anesthetics inhibit slow calcium channels: and narcotics are quite always vagomimetics, sometimes sympathicolytics, they often release histamine. Nevertheless, mechanism of action of various drugs remain unclear.

Action Potentials↗

[Hemodynamic interferences between diltiazem and thiopental--experimental study in the pig].

The clinical applications of calcium channel blockers are rapidly growing; as barbiturates interfere with intracellular calcium movements, the possibility of drug interaction at this level must be considered. We have studied the haemodynamic interaction of Thiopentone and Diltiazem in pigs. A loading dose of Diltiazem (0.15 mg X kg-1) was injected followed by a continuous administration of 0.07 mg X kg-1 X hour. From the fifth to the tenth minute, the reduced afterload was associated with a moderate depression of the contractility of the left ventricle. These values returned to the initial level within 30 minutes. Heart rate and cardiac output were not modified. The stability of these two parameters is thought to result from the complex interaction of both drugs on the sympathetic nervous system and the ventricular function.

Animals↗

[Anesthesia in surgery of Basedow's disease].

Adequate preparation for surgery can be achieved in patients with Grave's disease by a combination anti-thyroid medication, Lugol's solution and beta-blockers, mainly propranolol. Only in rare cases when this treatment had failed has plasmapheresis been used. No thyroid storm occurred in the 35 cases reported. Should this complication be encountered, plasmapheresis appears to be the treatment of choice.

Adrenergic beta-Antagonists↗

A specific antihistaminic premedication anti H1 anti H2 for pediatric anesthesia.

The danger of the anaphylactoid reactions which occur during pediatric general anesthesia leads the authors to use a specific antihistaminic premedication. The association of cimetidine and hydroxizine has been proved to be adequate to avoid systemic histamine adverse effects and to diminish gastric secretion in pediatric anesthesia. The authors recommend oral administration.

Anaphylaxis↗