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M Amrani

Publications and source records attributed to M Amrani.

82 records · Page 5Linked to original sources
PubMed1992

Detrimental effects of temperature on the efficacy of the University of Wisconsin solution when used for cardioplegia at moderate hypothermia. Comparison with the St. Thomas Hospital solution at 4 degrees C and 20 degrees C.

BACKGROUND: We have previously reported the superior protective properties of the University of Wisconsin (UW) solution compared with the St. Thomas solution (ST) in the rat heart subjected to the deep hypothermia (4 degrees C), thus demonstrating its possible use in cardiac transplantation. We thought it was important to evaluate the potential of the UW solution as a cardioplegic solution under the moderately hypothermic (20 degrees C) conditions of routine intraoperative myocardial protection. METHODS AND RESULTS: Isolated rat hearts were subjected to 60 minutes of ischemia at 4 degrees C or 30 (or 60) minutes of ischemia at 20 degrees C with UW, ST, and ST plus 100 mM K (ST + 100) solutions. Coronary flow, mechanical function, endothelial function, and ultrastructure were observed. Mean time (seconds) to infuse 10 ml of cardioplegic solution under constant pressure, a measure of coronary vascular resistance at 4 degrees C and 20 degrees C, respectively, for each solution were ST, 69.2 +/- 6.9 and 64.7 +/- 3.8; UW, 142.2 +/- 8.8 and 187.2 +/- 10.0 (p < 0.01); and ST + 100, 78.2 +/- 8.0 and 176 +/- 8.1 (p < 0.001). Mean recovery values of cardiac output (expressed as percentage of its preischemic value) after 60 minutes of ischemia at 4 degrees C were ST, 95.5 +/- 2.1%; UW, 93.0 +/- 2.4%; and ST + 100, 96.5 +/- 1.5%. After 30 minutes of ischemia at 20 degrees C, values were ST, 88.0 +/- 1.3%; UW, 72.2 +/- 3.6% (p < 0.005 versus ST); and ST + 100, 53.3 +/- 1.8% (p < 0.001 versus ST). CONCLUSIONS: The efficacies of UW and severely hyperkalemic cardioplegic solutions are affected by the degree of hypothermia under which they are used. Under moderate hypothermia (20 degrees C), severe hyperkalemia induces a marked increase in coronary vascular resistance that is associated with impaired myocardial protection. These studies discourage the use of UW for routine intraoperative cardioplegic arrest where the degree of hypothermia cannot be readily controlled. The ST solution does not share this constraint.

Adenosine↗
PubMed1992

Enhancement of low coronary reflow improves postischemic myocardial function.

The effect of reperfusion coronary vasodilatation on postischemic myocardial mechanical function has been investigated in the isolated working rat heart. After a working period to assess control function, all the hearts were subjected to a single infusion (10 ml) of St. Thomas' Hospital cardioplegic solution No. 1 at 4 degrees C and were kept immersed in the same solution for 4 hours at 4 degrees C. Then hearts (six in each group) were initially reperfused at 37 degrees C for 10 minutes, either with ordinary reperfusate (Krebs-Henseleit bicarbonate buffer) or with reperfusate containing additional coronary dilator. After this period, all hearts were subjected to a further 5 minutes of ordinary reperfusate before being put back into the working mode to assess functional recovery. Mean reperfusion coronary flows and the steady coronary flow measured after 10 minutes of reperfusion in ml/min +/- SEM were--Krebs (control): 17.4 +/- 0.39 and 13.4 +/- 0.40; adenosine (3.75 mumol/L): 19.9 +/- 0.6 and 16.7 +/- 0.8; papaverine (0.05 mmol/L): 21.8 +/- 2.3 and 17.3 +/- 1.8; dipyridamole (2 mmol/L): 20.7 +/- 1.7 and 17.9 +/- 1.0; nitroglycerin (15 mg/L): 20.5 +/- 0.45 and 19.9 +/- 1.4; diltiazem (0.05 mmol/L): 19.6 +/- 2.98 and 17.7 +/- 1.8; calcitonin gene-related peptide (0.03 mmol/L): 20.8 +/- 0.69 and 18.0 +/- 1.3; 5-hydroxytryptamine (0.01 mmol/L): 19.2 +/- 0.53 and 16.9 +/- 0.80. Mean postischemic recovery of cardiac output, peak aortic pressure, and differentiation of pressure were expressed as percent of preischemic control +/- SEM were--Krebs: 54.1 +/- 2.8, 69.1 +/- 2.8, and 53.9 +/- 3.0; adenosine: 78.0 +/- 5.6, 89.5 +/- 2.9, and 69.1 +/- 1.9; papaverine: 81.8 +/- 3.9, 91.8 +/- 3.1, and 71.0 +/- 4.1; dipyrdamole: 67.3 +/- 3.3, 84.3 +/- 2.3, and 75.0 +/- 2.7; nitroglycerin: 83.1 +/- 4.8, 79.7 +/- 2.7, and 69.0 +/- 0.5; diltiazem: 76.5 +/- 3.7, 85.9 +/- 2.9, and 73.3 +/- 1.7; calcitonin gene-related peptide: 79.5 +/- 3.6, 90.0 +/- 4.9, and 75.4 +/- 3.9; 5-hydroxytryptamine: 71.6 +/- 3.2, 85.5 +/- 3.5, and 67.9 +/- 4.8. There was a positive correlation between mean reperfusion coronary flow, steady coronary flow, and postischemic recovery of cardiac output, peak aortic pressure, and differentiation of pressure. Mean reperfusion coronary flow, steady coronary flow, and postischemic recovery of cardiac output, peak aortic pressure, and differentiation of pressure were significantly greater in groups reperfused with vasodilators (p < 0.05) compared with control values.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed1991

[Acrometastases. Apropos of 2 cases. Review of the literature].

Bone metastases in the hand and foot bone (acrometastases) are rarely observed. The authors report two new cases. The first case is chiefly interesting because of its multifocal appearance and its particularly rare origin (oesophagus). The second case is remarkable as it is the initial expression of a lung neoplasm. They propose a review of the literature on this subject and emphasize the origin, the mechanisms of spread the prognosis and treatment of this disease. The difficulty of the diagnosis is also stressed.

Adenocarcinoma↗
PubMed1991

[Traumatic arterio-venous fistula. Experience with 9 cases].

Traumatic arteriovenous fistulas (TAF) are rare forms of vascular injuries. The authors report an experience of nine new cases. Three of them result from a minor traumatism, while the six others are iatrogenic. The symptoms and the physical examination are very helpful in the diagnosis. Selective arteriography is the most useful paraclinical examination to confirm the affection and for the choice of the mode of therapy: surgery, selective arterial embolization, alone or used with surgery according to the characteristics and the location of the fistula.

Adolescent↗
PubMed1991

[Inflammatory aortic aneurysm and retroperitoneal fibrosis. Report of 6 cases].

The inflammatory aneurysm of the abdominal aorta is actually a well known and distinct entity. However its etiology is unknown and its clinical expression often remains a trap. The authors, through a six case experience insist on the surprising characters of the symptoms, and emphasize the contribution of the paraclinical triad (RSV, IUV, and CT Scan). They confirm the benefit of the surgical treatment on the aneurysm on the fibrosis decrease.

Aorta, Abdominal↗
PubMed1990

[True hermaphroditism. Late diagnosis. Surgical treatment and a 15-year follow-up].

True hermaphroditism is an usual cause of ambiguous genitalia. In some social areas, the diagnosis is often late and raised as pubertair abnormally. We report a case of a 12 years old Sicilian child, seen in 1975, raised as a boy and whose the main complain was a gynaecomastia. Clinical and paraclinical investigations revealed a small testicle on the one side and on ovary with an uterus and an obturated tube on the opposite side. A small recurvated penis, partially adherent to the scrotum is noticed. A structure embryologycally close to a vagina is also found behind the bladder. Cytogenetic structures showed a mixte karyotype: mosaicim 46 XX/46 XY with a ratio of a 80/20. Hormonal assessment showed a normal level of estrogen while testosterone is below the inferior threshold. A surgical treatment is carried out in three steps: removal of the internal female organs and testicular prosthesis replacement in the one side after castration, reconstruction of the recurvated penis and replacement of the other testicular prosthesis, and finally construction of the anterior urethra. Since the very first step of the surgical management and adjuvant hormonotherapy (testosterone) is administrated in order to decrease the gynaecomastia but also to allow the normal growth of the male organs. We discuss the benefice of a such therapeutic option in the true hermaphroditism lately diagnosed recording to organic and psychological data. We also point out the difficulty in therapeutic choice, mainly when the patient has raised as a boy. The follow-up in this case in 15 years.

Child↗
PubMedDate not supplied

Reactivity of small intramyocardial arteries from atherosclerotic and non-atherosclerotic human hearts.

Little is known about how the vascular reactivity of the coronary microcirculation is affected by upstream atherosclerotic disease. We have examined, with a wire myograph, the responses of intramyocardial arteries from hearts in which the epicardial vessels were either free of atherosclerotic lesions (non-diseased group) or were affected by atherosclerosis (diseased group). Vasodilator responses of preconstricted vessels to substance P (84.1 +/- 12.6 compared to 42.0 +/- 19.7%) were less in vessels from the diseased group (p < 0.05). In contrast, the relaxation to bradykinin (70.2 +/- 21.2 compared to 100.6 +/- 7.9%) was increased in vessels from the diseased group (p < 0.05). The dilator responses to acetylcholine, adenosine diphosphate, histamine and sodium nitroprusside showed no significant differences between arteries from each group. 5-Hydroxytryptamine was without any significant vasodilator effect in arteries from either group. Assessment of contractile function revealed that the responses to 5-hydroxytryptamine, acetylcholine, U46619, endothelin-1 and L-N(G)-monomethylarginine in each group were not significantly different. Histamine, noradrenaline and dopamine were without any significant contractile response. These results demonstrate that upstream atherosclerosis does not confer any global impairment of endothelium-dependent vasorelaxant responses or smooth muscle hyperreactivity to vasoconstrictors in the arteries that penetrate the myocardium.

15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5↗
PubMedDate not supplied

Mathematical modeling of phosphorus losses from land application of hog and cattle manure.

Mathematical models may provide a means to estimate phosphorus (P) losses from land application of manure. Phosphorus losses typically occur during brief episodes of runoff and erosion. Models must be able to simulate P losses during these episodes by representing the basic chemical, physical, and biological processes by which these losses occur. The mathematical model ecosys combines dynamic distributed flow of solutes and nonsolutes through runoff and erosion with convective-dispersive transport of solutes, and both biologically and thermodynamically driven transformations between solutes and nonsolutes. This model was tested against P lost in runoff, erosion, and leachate measured during 90 min of controlled rainfall at 65 mm h(-1) on soils from six sites at which different rates of manure had been applied over the previous 3 to 6 yr. Transport and transformation kinetics in the model enabled it to simulate changes of dissolved inorganic phosphorus (DIP) in runoff from >1.0 to <0.05 mg L(-1) and changes of total phosphorus (TP) in sediment from 15 to 3 mg L(-1) measured during controlled rainfall on soils with diverse P contents. Results from 60-yr model runs using these kinetics with different application rates of cattle manure indicated that (i) a positive interaction exists between annual rainfall and application rate on P losses and (ii) rates greater than 30 Mg ha(-1) yr(-1) would cause TP concentrations in water leaving the site to rise above acceptable limits. The interaction between rainfall and rate suggests that P losses from manure application at any site should be assessed under the upper range of likely rainfall intensities.

Agriculture↗
PubMedDate not supplied

[Skin lesions due to Mycobacterium marinum: surgical ablation. Apropos of a case of false paronychia].

A Mycobacterium marinum panaris-like cutaneous injury was observed in a 5-year old child. Such an affection may require surgical advice. Lack of its knowledge may lead to serious therapeutic mistakes and complications. The authors emphasize the epidemiologic, clinical and paraclinical data allowing the diagnosis and leading to the right treatment. They also point out the place of surgical therapy in these lesions.

Child, Preschool↗