ABSTRACT
Objective:To compare the differences of fluoroscopy time and dose between HIS bundle pacing and right ventricle apex pacing.Methods:This study includes thirty patients undergoing HIS bundle pacing (HIS group) and 32 patients undergoing right ventricular apex pacing (RVA group). The fluoroscopy time and cumulative dose (CD) to patients during surgery were recorded and analyzed.Results:The operation time for patients in HIS group and RVA group were (76.8±13.1) and (66.0±10.8) min ( t=3.386, P<0.001), respectively. The fluoroscopy time was (698.2±113.7) and (293.3±63.9) s ( t=14.709, P<0.001) and the CD were (391.3±70.0) and (162.3±40.5) mGy ( t=13.694, P<0.001) in HBP group and RVA group, respectively. In comparison, the fluoroscopy time and CD for HIS bundle electrode implantation were (501.2±112.3) s and (279.9±65.0) mGy, respectively, significantly higher than in the case of RVA, where the values were (103.4±30.6) s and (57.3±13.8) mGy ( t=15.864, Z=-6.524, P<0.001). Conclusions:Compared with right ventricular apical pacing, the HIS bundle pacing takes longer operation time, leading to higher radiation dose, which should be prudently selected.
ABSTRACT
Mitogen-activated protein kinase (MAPK) cascades are important players in the cellular signal pathways, and the deregulation of MAPKs is involved in a variety of diseases, especially cardiovascular disorders. This study was designed to investigate the effects of quercetin on proliferation of cardiac fibroblasts, measured the secretion of Col I & Col III by ELISA and the expression of extra cellular-signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK) p38 by eastern blotting in cardiac fibroblasts challenged with angiotensin (Ang-II). Results showed that Ang-II significantly increased the DNA synthesis and collagen secretion. In contrast, quercetin reversed such effects and inhibited cardiac fibroblasts proliferation. Furthermore, reactive oxygen species (ROS) stimulated the phosphorylation of ERK, p38 and JNK, while pre-administration of quercetin significantly (P<0.05) reduced the phosphorylation. All these evidences revealed that quercetin inhibited the MAPK pathway activation via ROS.
Subject(s)
MAP Kinase Signaling System/drug effects , Myocardium/pathology , Quercetin/pharmacology , Reactive Oxygen Species/metabolism , Angiotensin II/metabolism , Angiotensin II/pharmacology , Animals , Cardiotonic Agents/pharmacology , Cell Proliferation/drug effects , Cells, Cultured , Fibroblasts/drug effects , Fibroblasts/metabolism , Fibroblasts/pathology , Fibrosis , Heart/drug effects , MAP Kinase Kinase 4/metabolism , Myocardium/metabolism , Rats, WistarABSTRACT
Based on an empirical research on 31 medical institutions in Shanghai, this paper focused on explo-ring a "demands-based multi-integration" development mode adopted by medical institutions in Shanghai in the absence of social support currently, concluded that the mode had the characteristics of integration of multi-sup-portive force, demands priority, and projectization operation and so on, and finally analyzed the problems still ex-isting in the development of social work and gave policy suggestions.
ABSTRACT
Objective To investigate the mechanism of P/Q-type calcium channel in nitroglycerin induced migraine experimental model Methods Twenty Sprague-Dawley rats ( half female and half male) were randomly divided into control group and model group. The model of migraine rats was reproduced using Tasserelli Cristina method that wassubcutaneou injection of GTN of 10 mg/kg, once a week for four weeks. After the model of migraine had been established, trigeminal ganglion and trigeminocervical complex and cortex of frontal lobe were removed and the expressions of P/Q-type calcium channel were detected by RT- PCR and Western-blot, and at the same time the concentration of intracellular Ca2+ was investigated by Fluo- 3/AM fluorometric method. Results Compared with the control group, the expression of mRNA and protein of P/Q-type calcium channel of trigeminal ganglion and trigeminocervical complex (mRNA: 0. 472 36± 0. 049 54; protein: 0. 337 25 ± 0. 035 93 ) and cortex of frontal lobe ( mRNA: 0. 547 45 ± 0. 044 39 ; protein : 0. 402 13 ± 0. 029 83) in model group all upregulated (t = 2. 6697, 3. 1993, 3. 4398 and 3. 7661, all P <0. 05), at the same time the concentration of intracellular Ca2+ in model group increased (211 182 ± 12 973 vs 135 243 ± 18 105 in trigeminal ganglion and trigeminocervical complex; 186 511 ± 18 297 vs 143 289±25 175 in cortex of frontal lobe. t =10.7819 and 4. 3917, beth P<0.05). Conclusions P/Q- type calcium channel may play a role in the pathogenesis of migraine via its upregulated expression.
