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SUSAN McKAY RN PHD ACCE JOYCE ROBERTS CNM PHD 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》1985,14(2):101-106
Traditional management of second stage labor has come under scrutiny because of improved understanding of what normally occurs when second stage labor is allowed to proceed of its own accord without direction from birth attendants. When women bear down spontaneously as they feel the urge to push, either holding their breath briefly or with short exhalation of air, normal maternal and fetal physiological status is maintained and second stage labor does not appear to be lengthened. Using a variety of maternal positions during second stage labor can optimize physiologic functioning and increase maternal comfort. 相似文献
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Feasibility of Radiofrequency Powered, Thermal Balloon Ablation of Atrioventricular Bypass Tracts Via the Coronary Sinus: In Vivo Canine Studies 总被引:1,自引:0,他引:1
DANIEL B. FRAM ELLISON BERNS THOMAS ARETZ LINDA D. GILLAM JOSEPH S. MIKAN DAVID WATERS RAYMOND G. McKAY 《Pacing and clinical electrophysiology : PACE》1995,18(8):1518-1530
Radiofeequency catheter ablation of left sided accessory pathways is technically demanding and usually requires left heart catheterization. The feasibility of creating lesions from within the coronary sinus of sufficient size to ablate accessory pathways in humans using a thermal balloon catheter was studied in 20 dogs. In group 1 (n == 14), 17 thermal inflations were performed in 12 dogs at either 70°, 80°, or 90°C each for 30 or 60 seconds (in 2 dogs two non-thermal control inflations were performed). Animals were sacrificed 6.3 ± 1.6 days later. In group 2 (n = 6), seven thermal inflations were performed at 90°C each for 180, 300, or 360 seconds. Group 2 animals received antiplatelet and anticoagulant therapy for 1 week and were sacrificed at 13 ± 10.7 days. In both groups, hemodynamic, angiographic, and electrocardiographic studies were performed at baseline, 1 hour after inflation, and prior to sacrifice. All dogs remained clinically stable throughout the procedure and no complications were attributed to the effect of thermal inflation. Thermal lesions measured 14.4 ± 4.4 mm in length and extended from the coronary sinus intima to a mean depth of 2.9 ± 1.2 mm (range 1.4-6.5 mm). Group 2 lesions were significantly deeper than group 1 lesions (P = 0.03). Of the 24 thermal lesions created, atrial necrosis was present in 23 and ventricular necrosis in 11. In all lesions there was some degree of either atrial necrosis, ventricular necrosis, or both. A variable degree of coronary sinus thrombus was present in 18 dogs without clinical sequelae. It is concluded that radiofrequency balloon heating via the coronary sinus can create thermal lesions in the atrioventricular sulcus of dogs that may be of sufficient size to ablate accessory left-sided pathways in humans. (PACE 1995; 18: 1518-1530) 相似文献
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