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排序方式: 共有71条查询结果,搜索用时 15 毫秒
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2.
OLE-GUNNAR ANFINSEN ERIK KONGSGAARD ARNOLD FOERSTER HALFDAN AASS JAN P. AMLIE 《Pacing and clinical electrophysiology : PACE》1998,21(1):69-78
Interruption of atrial flutter and fibrillation by RF catheter ablation may be favored by large, elongated lesions. We administered RF current in unipolar and bipolar mode in porcine right atrium. Bipolar ablation was performed between the tip electrodes of two serially coupled catheters. With 4-mm tip electrodes in vitro, lesion length increased from a mean (SD) of 7.9 (1.2) mm at 3 mm-interelectrode distance (IED) to 13.3 (3.3) mm at 9-mm IED, but decreased at 12-mm IED due to nonconfluent lesions (P < 0.0001), With 4 mm distal electrodes and 8 mm IED, bipolar lesions were 65% longer than corresponding unipolar ablations. Switching to bipolar mode increased the lesion length more than increasing electrode tip length to 6 mm in unipolar mode. Power and temperature controlled ablation created equally sized lesions. Twelve anesthetized pigs were randomized to unipolar or two catheter bipolar temperature controlled ablation of the right atrial free wall. Bipolar ablation created confluent lesions with endocardial length × width of 13.5 (5.8) × 7.3 (3.7) mm, unipolar ablation 6.4 (2.8) × 4.6 (1.4) mm (P < 0.001 when comparing length and P = 0.013 for lesion width). The atrial lesions in both groups were transmural and extended into hilar lung lesions with maximal depth of 3.0 (1.1) and 2.6 (1.0) mm, respectively (P = 0.44). Five bipolarly and four unipolarly ablated pigs developed right diaphragmal paresis. We conclude that bipolar ablation may be preferable in situations where large, elongated lesions are favorable. The two catheter technique is feasible in porcine right atrium. Both bipolar and unipolar ablation of the porcine right atrial free wall may frequently be complicated by injury to the phrenic nerve and adjacent lung tissue. 相似文献
3.
Anne NAALSUND Bjorn JOHANSEN Arnold FOERSTER Alf KOLBENSTVEDT 《Respirology (Carlton, Vic.)》1996,1(3):207-212
Abstract The objective of this study was to present clinical and radiological data of eight women with histologically proven lymphangioleiomyomatosis (LAM) diagnosed between 1984 and 1994, and to suggest a diagnostic strategy when LAM is suspected. A review of case reports, including results of biopsies, lung function and radiological procedures was undertaken. The mean age of the women at start of symptoms was 36 years, and the mean age at time of diagnosis 42 years. The most frequent presenting complaint was dyspnea, either in conjunction with pneumothorax (3), chylothorax (2) or on exertion (2). All patients had airflow limitation and markedly reduced gas transfer. Five patients had 16 episodes of pneumothorax. In seven patients multiple cysts were observed on the surface of the lung during thoracotomy while computerized tomography (CT) scans revealed numerous cysts evenly distributed throughout the lung parenchyma. The procedures that confirmed the diagnosis included transbronchial lung biopsy (4), open lung biopsy (2), thoracoscopy (1), thoracotomy (3) and autopsy (1). Three specimens had to be revised before the histological diagnosis was confirmed. It was concluded that the important clues to a diagnosis of LAM are recurrent episodes of pneumothoraces in fertile women, progressive air-flow limitation, markedly reduced gas transfer and characteristic findings on thoracic CT scans. A specific request to the pathologist to stain lung tissue specimens for smooth muscle cells is mandatory. 相似文献
4.
Milman N Byg KE Juul-Jørgensen B Weis Bentzon M 《Hematology (Amsterdam, Netherlands)》1999,4(2):179-184
The serum ferritin assays, Ferritin RIA Amersham(TM) and Abbott AxSYM(TM) Ferritin were compared in order to translate values from one assay to the other. Serum ferritin was analysed with both assays in 102 samples. Logarithmic transformation of the results was performed in order to stabilize the variance. The relationship between the untransformed values was most exactly expressed by a proportionality: AxSYM Ferritin = 0.873 * RIA Ferritin. Due to this proportionality, the numerical difference between the assays increases with the ferritin concentration, although the percentage difference between the assays remains constant. 相似文献
5.
MERETE BAKKE BETTY HOLM BIRGIT LETH JENSEN LARS MICHLER EIGILD MÖLLER 《European journal of oral sciences》1990,98(2):149-158
Abstract – Unilateral bite force was studied in 63 women and 59 men, 8-68 yr of age. The subjects had a minimum of 24 teeth and no symptoms or signs of disorders of the craniomandibular system. Bite force was stronger in men (522 N) than in women (441 N). It increased with age until 25 yr ( P <0.0001). The level decreased significantly after this age in women, whereas it only tended to decrease in men and not until after 45 yr of age. Body height was positively associated with force. However, the strongest correlation (r: 0.43–0.49, p <0.01) with adult bite force was occlusal contact. The normal bite-force values with important determining factors provide reference data for screening of elevator muscle strength in routine examination of craniomandibular function. 相似文献
6.
GÖRAN DAHLLÖF CARL-MAGNUS FORSBERG MARGARETA NÄSMAN TORSTEN MATTSSON THOMAS MODÉER BIRGIT BORGSTRÖM PER BOLME OLLE RINGDÉN 《European journal of oral sciences》1991,99(1):44-47
Abstract— The effect of growth hormone (GH) treatment on craniofacial development was studied in five children exhibiting growth retardation following bone marrow transplantation. Linear and angular measurements were made on lateral radiographic cephalograms taken prior to the start of GH treatment and after an average treatment time of 1.2 yr. The results showed that the mean growth increments of mandibular length in the GH treated children, exceeded the corresponding values of the control group by 150% during the period of investigation. It is suggested that this dimensional increase in the patients was due to GH stimulation on the chondral growth process in the mandibular condyles. 相似文献
7.
The effects of albumin bound fatty acids on the platelet inhibitory function of human endothelial cells 总被引:2,自引:0,他引:2
Abstract. This study was carried out to evaluate the effects of albumin-bound fatty acids on the anti-platelet effects of endothelial cells. Primary cultures of human endothelial cells (ECM), grown in confluent monolayers, were incubated with plasma or growth medium enriched with albumin-bound fatty acids (FA) for 2–20 h. The effects of ECM on ADP-induced platelet aggregation (PA) and collagen-induced PA and prostaglandin synthesis in platelet-rich plasma were tested.
ECM released an inhibitor of platelet reactions which resembled the activity of PGI2 (prostacyclin). The inhibitory activity was increased by preincubation of ECM with arachidonic acid (AA). A moderate decrease of the activity was obtained by incubation with longchain saturated, monoenoic and dienoic unsaturated fatty acids. A pronounced decrease of the inhibitor was obtained by incubation with di-homo-γ-linolenic acid (DHLA).
Paired combinations of AA with the other fatty acids in the incubation medium partially restored the inhibitor activity obtained by the separate FA.
The stimulation of the inhibitor by AA was dose dependent and high concentrations of AA reduced this activity.
The present study indicates that the quantity and quality of the plasma free fatty acids can affect the endothelial cells' ability to act as a non-thrombogenic surface. 相似文献
ECM released an inhibitor of platelet reactions which resembled the activity of PGI
Paired combinations of AA with the other fatty acids in the incubation medium partially restored the inhibitor activity obtained by the separate FA.
The stimulation of the inhibitor by AA was dose dependent and high concentrations of AA reduced this activity.
The present study indicates that the quantity and quality of the plasma free fatty acids can affect the endothelial cells' ability to act as a non-thrombogenic surface. 相似文献
8.
HANS-JOACHIM TRAPPE HELMUT KLEIN HANS-GERD FIEGUTH BIRGIT KIELBLOCK PAUL WENZLAFF PAUL R. LICHTLEN 《Pacing and clinical electrophysiology : PACE》1993,16(1):153-158
Clinical efficacy and safety of two new third-generation implantable cardioverter defibrillators (ICD) were studied in 38 patients with ventricular tachycardia (VT) or fibrillation (VF). There were 31 patients with coronary disease, three patients with right ventricular dysplasia, one patient with dilated cardiomyopathy, and three patients with valvular disease. Twenty-four patients (group I) received an ICD with monophasic (Ventak PRx 1700, CPI) and 14 patients (group II) with biphasic shocks (Cadence V 100, Ventritex). Intraoperatively, the mean defibrillation threshold was significantly lower in group II than in group I, both in patients with induced VT (group I 11.0 ± 6.3 joules: group N 5.8 ± 1.3 joules) (P < O.01) and induced VF (group I 17.5 ± 4.6 joules; group II 9.6 ± 5.2 joules) (P < O.O1). During the mean follow-up of 12 ± 7 months four patients (11%) died. 865 arrhythmia events (AE) occurred and were terminated by ATP (671 VTs, 78%). Acceleration of VTs was observed in 28 AE (3%) and ATP was unable to interrupt 58 AE (7%). ICD shocks were delivered as a first therapy in 108 AE (13%). 相似文献
9.
DAVID EDVARDSSON RN PhD P.O. SANDMAN RN PhD BIRGIT RASMUSSEN RN PhD 《Journal of nursing management》2009,17(7):790-795
Aim The aim of the study was to construct and evaluate psychometric properties of the Swedish language Person-centred Climate Questionnaire – staff version.
Background Person-centred care is often quoted but ill defined, and the literature warrants the development of valid and reliable measurement tools.
Methods During 2006, a questionnaire was constructed and distributed to a sample of Swedish hospital staff ( n = 600). Questionnaire data was subjected to item analysis and reduction. Psychometrical properties of the questionnaire were evaluated.
Results The 14-item Person-centred Climate Questionnaire showed satisfactory psychometric properties. Measures of validity were good, internal consistency was high, Cronbach's alpha was satisfactory for the total scale (0.88) and test–retest reliability was adequate.
Conclusion The results indicate that the staff Person-centred Climate Questionnaire is a valid and reliable tool for assessing staff perceptions of the person centredness of hospital environments.
Implications for nursing management This instrument makes it possible to study the degree of person-centredness in relation to different organizational systems, environments, staff groups and managerial styles. In addition, staff variables such as turnover rates, health outcomes and efficacy can be related to staff perceived person centredness of the organization. 相似文献
Background Person-centred care is often quoted but ill defined, and the literature warrants the development of valid and reliable measurement tools.
Methods During 2006, a questionnaire was constructed and distributed to a sample of Swedish hospital staff ( n = 600). Questionnaire data was subjected to item analysis and reduction. Psychometrical properties of the questionnaire were evaluated.
Results The 14-item Person-centred Climate Questionnaire showed satisfactory psychometric properties. Measures of validity were good, internal consistency was high, Cronbach's alpha was satisfactory for the total scale (0.88) and test–retest reliability was adequate.
Conclusion The results indicate that the staff Person-centred Climate Questionnaire is a valid and reliable tool for assessing staff perceptions of the person centredness of hospital environments.
Implications for nursing management This instrument makes it possible to study the degree of person-centredness in relation to different organizational systems, environments, staff groups and managerial styles. In addition, staff variables such as turnover rates, health outcomes and efficacy can be related to staff perceived person centredness of the organization. 相似文献
10.
Role of Antitachycardia Pacing in Patients with Third Generation Cardioverter Defibrillators 总被引:3,自引:0,他引:3
HANS-JOACHIM TRAPPE HELMUT KLEIN BIRGIT KIELBLOCK 《Pacing and clinical electrophysiology : PACE》1994,17(3):506-513
The most effective antitachycardia pacing (ATP) mode is still a matter of debate. Randomized prospective testing of 3 different ATP modes was performed in B5 patients (pts) prior to and after cardioverter Defibrillator implantation (Ventak PHx 36 pts, Cadence V 100 29 pts). All 3 ATP modes included 4 stimulation attempts with 4–7 adaptive scanning burst pulses. Adaptive burst coupling interval was 75% in mode A, 81% in mode B and 69% in mode C. Autodecremental scanning within bursts was 8 msec in all, decremenial scanning between bursts was 8 msec in modes B and C. Each ATP mode had to be tested 3 times; all 3 ATP modes were randomly applied to each pt. During preoperative testing 91 of 133 VT episodes (68%) could be terminated by ATP. Termination was achieved in 68% with mode A, 68% with mode B and 73% with mode C, During predischarge testing, 251 VTs were induced and ATP was successful in 147 VTs (59%). Termination rate was 56% with mode A, 68% with mode B and 50% with mode C. During the mean follow-up of 12 months, 2301 arrhythmia episodes (AE) occurred. ATP was performed in 2097 AE (91%) and successful in 1920 AE (92%). Acceleration of VT occurred in 65 AE (3%) and unsuccessful ATP was observed in 112 AE (5%). It is concluded that ATP in general is highly effective in pts with sustained VT. None of the tested ATP modes, however, proved to be superior to the other. 相似文献