[Preoperative magnetic resonance imaging evaluation of the aortic annular diameter in aortic valve stenosis].

Accurate preoperative knowledge of the aortic annular diameter is a great value in determining the appropriate procedure for aortic valve stenosis. We have successfully used magnetic resonance imaging (MRI) to evaluate the size of the aortic annular diameter preoperatively. Between October 1997 and October 1998, 5 aortic valve replacements were performed in patients with aortic valve stenosis. MRI was performed preoperatively in all cases. All images were gated to the R-wave of the electrocardiogram. Images representing 5 mm slices were acquired in the plane which is parallel to the line through the center points of the aortic root and left ventricle outflow tract. The maximum diameter of the aortic annulus (D) was measured at the point just below the attachment of the aortic valve leaflets. This diameter was compared to the maximum diameter of the prosthetic valve sizer (D 1) which could be easily inserted into the aortic annulus intraoperatively, and to the diameter of the prosthetic valve (D 2) that ultimately was implanted. Twenty-five minutes were required to scan each patient. There were no complications related to scanning. Mean values were D = 23.4 mm, D 1 = 22.3 mm and D 2 = 21.4 mm. There was a significant correlation between D and D 1, and D 2 was approximately 2 mm smaller than D. MRI evaluation is an accurate, noninvasive method for determining the aortic annular diameter preoperatively. We highly recommend this method for measuring the aortic annular diameter in case of aortic valve stenosis as part of the preoperative evaluation.

Endovascular photodynamic therapy using mono-L-aspartyl-chlorin e6 to inhibit Intimal hyperplasia in balloon-injured rabbit arteries.

BACKGROUND AND OBJECTIVE: Intimal hyperplasia (IH) leading to restenosis is a major complication of arterial revascularization. The purpose of this study was to investigate the effect of photodynamic therapy (PDT) using mono-L-aspartyl chlorin e6 (NPe6) as a photosensitizer and intraluminal radial irradiation for inhibition of IH experimentally. STUDY DESIGN/MATERIALS AND METHODS: Study of laser transmission through the blood indicated that exclusion of blood is a prerequisite for intraluminal PDT. For homogeneous radial laser irradiation to the vessel wall, we used a newly developed cylindrical diffusing balloon laser fiber. Injuries were induced by pulling a balloon catheter through the right iliac artery of rabbits. One and 6 hours after the NPe6 injection (5mg/kg i.v.), drug distribution was examined by fluorescence microscopy. Nineteen rabbits received NPe6 at the time of injuries and PDT was performed with 664-nm laser at 30 and 10 J/cm(2) (20, 30, 40 mW/cm(2)) 1 hour after the injuries. The arteries were harvested at 2 days. In a second group of rabbits, PDT was given at 30 mW/cm(2) (30 J/cm(2)). Two weeks after treatment, the arteries were removed and examined histologically. RESULTS: NPe6 was found to be distributed selectively in the injured media. Endovascular NPe6-PDT showed complete depletion of smooth muscle cells even with 10 J/cm(2) at 2 days. IH was significantly inhibited at 14 days after PDT. CONCLUSIONS: Endovascular PDT of injured artery using NPe6 can prevent IH in this model of arterial wall injury and may become clinically useful for the prophylaxis of IH.

[Hepatolithiasis and Caroli's disease in Argentina: results of a multicenter study]. / Hepatolitiasis y enfermedad de Caroli en Argentina: resultados de un estudio multicéntrico.

The goal of this study was to determine the prevalence, epidemiology and clinical-therapeutical evolution of hepatolithiasis (HL) in Argentina. With this purpose a survey was conducted sending a questionnaire to ten referencial and interventional radiology centers in the country. Seven centers answered on time. In the last five years a total of 8,736 consecutive patients were examined for cholangiography (endoscopic retrograde cholangiography, PTC). A total of 5,920 (68%) were biliary lithiasis and 53 (0.9%, range 0.5-2.6%) of these were HL. In case of HL the diagnostic procedure was the ERCP in 68% of the cases, and the PTC in the remainder 32%. The patients with HL (53% females, mean age 52, range 23-85) clinically presented cholangitis (79%); pancreatitis (6%) and five (9.4%) showed evolution to a biliary cirrhosis. Associated diseases or abnormalities of the biliary tree were: biliary postsurgical strictures (BPS), 28%; Caroli's Syndrome, 20%; and choledocholithiasis, 28%. While a 9.4% presented a "biliary history" (that was defined as two or more episodes of biliary surgery) and a 5.7% lacked associated or predisposing diseases. Follow-up was lost in 23% of the cases and in 77% a follow up of 38 months (range 8-60) was observed with 4.8% mortality rate. The treatment was hepatobiliary surgery in 58% of the cases; endoscopic papillotomy in 17% and combined treatments that included extracorporeal shock wave lithotripsy and ursodeoxycholic acid (UDCA) in 15%. Four out of 53 cases (7.5%) received UDCA as the only successful therapy. HL is an entity with high biliary morbidity in 85% of the cases and development in to cirrhosis in 9.4%. When the diagnosis is made in the western world both BPS and Caroli must be discarded first. Combined treatments or only UDCA are new therapeutical alternative in the western world.

Hepatolitiasis y enfermedad de Caroli en Argentina: resultados de un estudio multicéntrico / Hepatolithiasis and Caroli's disease in Argentina: results of a multicenter study

A fin de determinar la prevalencia epidemiología y comportamiento clínico-terapêutico de la hepatolitiasis (HL) en el país se envió un cuestionario a 10 centros de referencia, en Radiología invasiva de vía biliar. De 10 centros encuestados, 7 (70 por ciento) contestaron en tiempo y forma. Reuniéndose un total de 8.736 colangiografías (C) en los últimos 5 años: 5.920 (68 por ciento) fueron litiasis biliares y 53 de estas resultaron HL (0.9 por ciento, rango 0,5-2.6 por ciento). El método diagnóstico fue la C. retrógrada en el 36 (68 por ciento) y en el 17 (32 por ciento) la C. transhepática. De 53 pacientes con HL (53 por ciento, x de edad 52, rango 23-85); el 79 por ciento (42/53) se presentó clínicamente con una colangitis; un 6 por ciento 3/53) padeció una pancreatitis aguda y un 9.4 por ciento (5/53), evolucionó a una cirrosis biliar. Las enfermedades predisponentes a HL fueron: en el 28 por ciento (15/53) estenosis postquirúrgica de la via biliar (EPQ); en el 20 por ciento (11/53) Enfermedad de Carolí en otro 28 por ciento (15/53) panlitiasiscoledociana. Mientras que un 9,4 por ciento (5/53) presentó una "historia biliar" (dos o más intervenciones sobre la via biliar) y en un 5,7 por ciento (3/53) no se hallaron factores predisponentes. En un 77 por ciento se observó un follow-up de 38 meses (rango 8-60), con una mortalidad de 4,8 por ciento (2/41): siendo tratados con cirurgía en el 58 por ciento de los casos (31/53); papilotomía en el 17 por ciento (9/53) y tratamiento combinados en el 15 por ciento (8/53) que incluían a litotripsia extracorpórea y Ac. Ursodesoxicólico(AUDC). Cuatro de 53 (7.5 por ciento) recibieron AUDC como única terapéutica. Se concluye que la HL es una entidad con alta morbilidad biliar (85 por ciento) y heoática (cirrosis en el 9.4 por ciento). Cuando se diagnostica en Occidente, debe buscarse EPQ o un Carolí. Siendo los tratamientos combinados o el AUDC como única alternativa, una nueva modalidad terapéutica del mundo occidental.

Hepatolitiasis y enfermedad de Caroli en Argentina: resultados de un estudio multicéntrico. / [Hepatolithiasis and Carolis disease in Argentina: results of a multicenter study]

The goal of this study was to determine the prevalence, epidemiology and clinical-therapeutical evolution of hepatolithiasis (HL) in Argentina. With this purpose a survey was conducted sending a questionnaire to ten referencial and interventional radiology centers in the country. Seven centers answered on time. In the last five years a total of 8,736 consecutive patients were examined for cholangiography (endoscopic retrograde cholangiography, PTC). A total of 5,920 (68

) were biliary lithiasis and 53 (0.9

, range 0.5-2.6

) of these were HL. In case of HL the diagnostic procedure was the ERCP in 68

of the cases, and the PTC in the remainder 32

. The patients with HL (53

females, mean age 52, range 23-85) clinically presented cholangitis (79

); pancreatitis (6

) and five (9.4

) showed evolution to a biliary cirrhosis. Associated diseases or abnormalities of the biliary tree were: biliary postsurgical strictures (BPS), 28

; Carolis Syndrome, 20

; and choledocholithiasis, 28

. While a 9.4

presented a [quot ]biliary history[quot ] (that was defined as two or more episodes of biliary surgery) and a 5.7

lacked associated or predisposing diseases. Follow-up was lost in 23

of the cases and in 77

a follow up of 38 months (range 8-60) was observed with 4.8

mortality rate. The treatment was hepatobiliary surgery in 58

of the cases; endoscopic papillotomy in 17

and combined treatments that included extracorporeal shock wave lithotripsy and ursodeoxycholic acid (UDCA) in 15

. Four out of 53 cases (7.5

) received UDCA as the only successful therapy. HL is an entity with high biliary morbidity in 85

of the cases and development in to cirrhosis in 9.4

. When the diagnosis is made in the western world both BPS and Caroli must be discarded first. Combined treatments or only UDCA are new therapeutical alternative in the western world.

Hepatolitiasis y enfermedad de Caroli en Argentina: resultados de un estudio multicéntrico / Hepatolithiasis and Carolis disease in Argentina: results of a multicenter study

A fin de determinar la prevalencia epidemiología y comportamiento clínico-terapÛutico de la hepatolitiasis (HL) en el país se envió un cuestionario a 10 centros de referencia, en Radiología invasiva de vía biliar. De 10 centros encuestados, 7 (70 por ciento) contestaron en tiempo y forma. Reuniéndose un total de 8.736 colangiografías (C) en los últimos 5 años: 5.920 (68 por ciento) fueron litiasis biliares y 53 de estas resultaron HL (0.9 por ciento, rango 0,5-2.6 por ciento). El método diagnóstico fue la C. retrógrada en el 36 (68 por ciento) y en el 17 (32 por ciento) la C. transhepática. De 53 pacientes con HL (53 por ciento, x de edad 52, rango 23-85); el 79 por ciento (42/53) se presentó clínicamente con una colangitis; un 6 por ciento 3/53) padeció una pancreatitis aguda y un 9.4 por ciento (5/53), evolucionó a una cirrosis biliar. Las enfermedades predisponentes a HL fueron: en el 28 por ciento (15/53) estenosis postquirúrgica de la via biliar (EPQ); en el 20 por ciento (11/53) Enfermedad de Carolí en otro 28 por ciento (15/53) panlitiasiscoledociana. Mientras que un 9,4 por ciento (5/53) presentó una "historia biliar" (dos o más intervenciones sobre la via biliar) y en un 5,7 por ciento (3/53) no se hallaron factores predisponentes. En un 77 por ciento se observó un follow-up de 38 meses (rango 8-60), con una mortalidad de 4,8 por ciento (2/41): siendo tratados con cirurgía en el 58 por ciento de los casos (31/53); papilotomía en el 17 por ciento (9/53) y tratamiento combinados en el 15 por ciento (8/53) que incluían a litotripsia extracorpórea y Ac. Ursodesoxicólico(AUDC). Cuatro de 53 (7.5 por ciento) recibieron AUDC como única terapéutica. Se concluye que la HL es una entidad con alta morbilidad biliar (85 por ciento) y heoática (cirrosis en el 9.4 por ciento). Cuando se diagnostica en Occidente, debe buscarse EPQ o un Carolí. Siendo los tratamientos combinados o el AUDC como única alternativa, una nueva modalidad terapéutica del mundo occidental. (AU)

[New method for closure of median sternotomy: usefulness of barbed staple].

In this report, 15 cases using straight staple (group A) and 35 cases using barbed staple (group B) were compared for the purpose of investigating efficacy for median sternal closure. The staples were placed by a Stapilizer powered metaphyseal staple system following partial transsternal fixation with two wires. As a means of assessing the status of back out, which is a major cause of poor fixation, the back out rate (BOR) was measured on lateral sternal radiographies. The average BOR was found to be 33.8% in group A and 21.2% in group B (p < 0.001). Barbed staples seemed to be more useful for sternal fixation than straight staples. This method of applying barbed staples had the advantages of speed, ease of insertion and noninvasion of the retrosternal region. It should be recommended in cases with severe adhesion of the retrosternal region after coronary operation.