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--> 00:02.506\n大家好。\n\n00:03.221 --> 00:05.372\n我们今天来科普讲解。\n\n00:06.267 --> 00:08.767\n呼吸系统疾病的发病机制。\n\n00:12.517 --> 00:17.466\n我将从以下几个疾病讲解它们的发病机制。\n\n00:18.245 --> 00:25.895\n分别是慢性阻塞性肺疾病、哮喘、肺纤维化、肺癌。\n\n00:27.006 --> 00:29.156\n急性呼吸窘迫综合征。\n\n00:30.747 --> 00:31.072\n首先，\n\n00:31.072 --> 00:34.347\n第一个疾病是慢性阻塞性肺疾病。\n\n00:35.375 --> 00:36.625\n俗称COPD。\n\n00:37.075 --> 00:38.424\n它的发病机制。\n\n00:39.840 --> 00:45.189\n它的发病机制中最重要的一个是氧化应激与炎症反应。\n\n00:46.657 --> 00:50.657\n氧化应激是COPD发病的关键因素之一。\n\n00:51.676 --> 00:53.826\n香烟、烟雾等有害物质。\n\n00:54.650 --> 00:57.650\n使体内氧化与抗氧化失衡。\n\n00:58.200 --> 01:00.250\n产生大量活性氧。\n\n01:01.173 --> 01:01.523\n导致。\n\n01:02.651 --> 01:07.450\n脂质过氧化、蛋白质修饰和DNA损伤。\n\n01:08.595 --> 01:09.370\n氧化应激，\n\n01:09.370 --> 01:12.794\n激活NFKB等转录因子。\n\n01:13.644 --> 01:19.194\n促进炎症因子如IL八TNF、阿尔法的释放，\n\n01:20.044 --> 01:22.595\n引发慢性炎症反应，\n\n01:22.995 --> 01:25.995\n加重气道和肺实质损伤。\n\n01:27.291 --> 01:30.241\n第二个是炎症细胞的浸润与作用。\n\n01:31.255 --> 01:32.805\n慢性炎症过程中，\n\n01:33.305 --> 01:34.606\n中性粒细胞。\n\n01:35.514 --> 01:41.915\n巨噬细胞、T淋巴细胞等炎症细胞大量浸润肺组织。\n\n01:42.991 --> 01:49.592\n中性粒细胞释放弹性蛋白酶等蛋白酶破坏肺泡结构。\n\n01:50.416 --> 01:51.666\n导致肺气肿。\n\n01:52.859 --> 01:56.859\n巨噬细胞在肺部持续存在并激活。\n\n01:58.041 --> 01:59.941\n释放多种炎症介质。\n\n02:00.690 --> 02:02.589\n进一步加剧炎症反应。\n\n02:03.457 --> 02:06.656\n促进气道重塑和肺功能下降。\n\n02:09.266 --> 02:11.666\n蛋白酶与抗蛋白酶失衡。\n\n02:12.708 --> 02:14.208\n弹力蛋白酶的作用，\n\n02:14.708 --> 02:16.908\n在COPD患者中，\n\n02:16.908 --> 02:20.208\n弹力蛋白酶的活性显著增加。\n\n02:21.179 --> 02:25.229\n弹性蛋白酶可降解肺泡壁的弹性纤维。\n\n02:26.214 --> 02:27.615\n破坏肺泡结构，\n\n02:28.065 --> 02:30.764\n导致肺气肿的发生和发展。\n\n02:31.514 --> 02:37.815\n弹性蛋白酶的过度释放还与气道炎症反应相互作用。\n\n02:38.666 --> 02:42.716\n进一步加重肺组织的损伤和功能障碍。\n\n02:44.341 --> 02:45.940\n抗蛋白酶的减少。\n\n02:46.906 --> 02:52.807\n阿尔法一抗胰蛋白酶主要是是主要的弹性蛋白酶抑制剂。\n\n02:53.623 --> 03:00.423\n其缺乏会加重肺组织的弹性、蛋白酶损伤、吸烟等有害因素。\n\n03:01.647 --> 03:06.397\n可抑制阿尔法抗胰蛋白酶的合成和活性。\n\n03:07.673 --> 03:13.324\n抗蛋白酶系统的失衡使得弹性蛋白酶的抑制不足。\n\n03:14.654 --> 03:21.453\n导致肺组织的持续破坏是COPD发生的重要机制之一。\n\n03:24.001 --> 03:26.151\n还有细胞凋亡与衰老。\n\n03:28.343 --> 03:32.919\nCOPD患者肺组织中细胞凋亡增加，\n\n03:33.419 --> 03:35.669\n包括肺泡上皮细胞。\n\n03:36.679 --> 03:37.979\n肺泡巨噬细胞。\n\n03:38.871 --> 03:40.770\n和气道上皮细胞等。\n\n03:41.839 --> 03:43.339\n细胞凋亡的增加。\n\n03:44.242 --> 03:46.692\n与氧化应激炎症反应。\n\n03:47.546 --> 03:50.597\n和DNA损伤等因素密切相关。\n\n03:51.490 --> 03:55.789\n肺泡上皮细胞凋亡导致肺泡结构破坏，\n\n03:56.240 --> 03:58.339\n影响气体交换功能。\n\n03:59.212 --> 04:04.013\n气道上皮细胞凋亡可引起气道重塑与狭窄，\n\n04:04.563 --> 04:06.162\n加重气流受限。\n\n04:08.162 --> 04:13.361\n细胞衰老在COPD的发生发展中也起着重要作用。\n\n04:14.261 --> 04:19.812\n衰老细胞分泌多种炎症因子和趋化因子。\n\n04:20.638 --> 04:22.988\n形成慢性炎症微环境，\n\n04:23.437 --> 04:25.787\n促进促进疾病发展。\n\n04:26.856 --> 04:33.207\n肺组织中衰老细胞的积累还会影响组织的修复和再生能力，\n\n04:33.606 --> 04:36.057\n导致肺功能的持续下降。\n\n04:36.816 --> 04:38.115\n和疾病的慢性化。\n\n04:40.122 --> 04:41.423\n第二个疾病是哮喘。\n\n04:42.386 --> 04:46.587\n哮喘发生的机制主要是气道炎症与高反应。\n\n04:47.802 --> 04:51.802\n哮喘是一种以气道炎症为特征的慢性疾病。\n\n04:52.740 --> 05:01.591\n嗜酸性粒细胞、肥大细胞、T淋巴细胞等炎症细胞在气道炎症中发挥重要作用。\n\n05:02.721 --> 05:05.372\n这些细胞释放多种炎症介质。\n\n05:06.109 --> 05:09.709\n如组胺、白三烯和细胞因子等。\n\n05:10.792 --> 05:12.592\n导致气道粘膜水肿。\n\n05:13.352 --> 05:16.553\n粘液分泌增加和和气道平滑肌收缩。\n\n05:17.488 --> 05:22.437\n气道炎症反应还引起气道上皮细胞的损伤和脱落。\n\n05:23.273 --> 05:26.723\n进一步加重气道的炎症和功能障碍。\n\n05:28.161 --> 05:31.911\n气道炎症是气道高反应形成的主要机制，\n\n05:32.610 --> 05:38.661\n炎症介质可使气道平滑肌对各种刺激物的敏感性增加。\n\n05:39.631 --> 05:41.830\n导致气道收缩反应增加。\n\n05:42.929 --> 05:46.929\n气道高反应是哮喘患者出现反复喘息。\n\n05:47.902 --> 05:51.002\n和呼吸困难的重要病理生理基础。\n\n05:52.529 --> 05:56.329\n气道重塑也是气道高反应的重要因素，\n\n05:57.029 --> 05:58.980\n气道平滑肌的增加，\n\n05:59.480 --> 06:00.779\n基底膜增厚。\n\n06:01.591 --> 06:05.890\n和胶原蛋白沉积等重塑改变，\n\n06:06.290 --> 06:09.640\n使气道结构和功能发生异常。\n\n06:10.566 --> 06:13.165\n进一步加重气道高反应性。\n\n06:15.467 --> 06:22.117\n免疫机制与过敏反应、哮喘的发生与特异免疫反应密切相关。\n\n06:23.240 --> 06:27.490\n过敏原如花粉、尘螨等进入机体后。\n\n06:28.816 --> 06:32.066\n和诱导T、H2型免疫反应。\n\n06:34.005 --> 06:35.505\nP2型细胞分泌。\n\n06:36.446 --> 06:40.997\nIL4、IL 5和IL 13等细胞因子。\n\n06:42.135 --> 06:45.035\n促进B细胞产生IG、e抗体。\n\n06:46.016 --> 06:52.342\nIGE与前肥大细胞和嗜碱性粒细胞表面的。\n\n06:53.720 --> 06:54.369\n相结合，\n\n06:54.420 --> 06:57.269\n使气道处于致敏状态。\n\n06:58.119 --> 07:01.144\n当再次接触过敏原，\n\n07:01.144 --> 07:03.070\nIGE与过敏原结合。\n\n07:04.492 --> 07:08.291\n激活起大量细胞和嗜碱性粒细胞。\n\n07:09.585 --> 07:10.936\n释放炎症介质，\n\n07:10.936 --> 07:12.735\n引起哮喘发作。\n\n07:13.876 --> 07:15.675\n非特异性免疫的参与。\n\n07:16.593 --> 07:18.694\n除了特异免疫反应外，\n\n07:19.093 --> 07:23.093\n非特异性免疫也参与哮喘的发病过程，\n\n07:23.894 --> 07:29.493\n气道上皮细胞在接触致敏原或病毒感染等刺激后。\n\n07:30.295 --> 07:33.795\n可释放多种细胞因子和趋化因子。\n\n07:34.946 --> 07:39.221\n如TSLPIL 25和I，\n\n07:39.221 --> 07:39.496\nL33.\n\n07:40.440 --> 07:42.239\n激活天然免疫细胞。\n\n07:43.161 --> 07:45.911\n和树突状细胞和巨噬细胞。\n\n07:47.002 --> 07:52.552\n这些天然免疫细胞进一步促进T、H二型免疫反应的发生。\n\n07:53.845 --> 07:56.545\n加剧气道炎症和哮喘的症状。\n\n08:00.419 --> 08:02.519\n气道重塑和结构改变。\n\n08:04.407 --> 08:08.856\n气道重塑是哮喘慢性炎症的重要后果之一。\n\n08:09.894 --> 08:16.544\n气道平滑肌细胞在炎症介质的刺激下发生增生和肥大。\n\n08:17.578 --> 08:19.227\n导致气道壁增厚，\n\n08:19.477 --> 08:20.828\n气道腔狭窄。\n\n08:21.694 --> 08:24.343\n气道平滑肌的收缩功能增加。\n\n08:25.437 --> 08:28.088\n对各种刺激物的反应性增加。\n\n08:29.166 --> 08:33.267\n进一步加重气道高反应性和呼吸困难症状。\n\n08:34.309 --> 08:37.409\n气道基底膜增厚和胶原积累。\n\n08:39.200 --> 08:41.549\n也是气道重塑的重要表现。\n\n08:42.591 --> 08:50.492\n炎症细胞释放的蛋白酶和细胞因子可诱导成纤维细胞的活化和增殖。\n\n08:51.437 --> 08:54.138\n促进胶原蛋白的合成与沉积。\n\n08:55.104 --> 08:58.005\n基底膜的增厚和胶原沉积。\n\n08:59.335 --> 09:01.135\n使气道结构。\n\n09:02.302 --> 09:03.078\n更加僵硬，\n\n09:03.078 --> 09:06.153\n影响气道的弹性和扩张能力，\n\n09:06.502 --> 09:09.703\n导致气道功能的障碍持续存在。\n\n09:11.802 --> 09:15.153\n第三个疾病是肺纤维化的发病机制。\n\n09:18.331 --> 09:20.481\n细胞外介质的异常沉积。\n\n09:21.323 --> 09:26.874\n正常情况下细胞外基质的合成与降解处于动态平衡。\n\n09:27.573 --> 09:29.624\n在肺纤维化患者中。\n\n09:30.744 --> 09:35.945\n基质金属蛋白酶和组织蛋白酶抑制剂的平衡失调。\n\n09:36.853 --> 09:39.552\n导致细胞外介质的降解减少，\n\n09:39.703 --> 09:40.752\n沉积增加。\n\n09:44.609 --> 09:45.309\nTIMS.\n\n09:46.731 --> 09:48.481\n的过度表达抑制了。\n\n09:49.697 --> 09:52.046\n基质蛋白酶的活性。\n\n09:52.882 --> 09:55.981\n使得细胞外介质无法正常降解，\n\n09:56.331 --> 09:59.781\n进一步加重了肺组织的纤维化过程。\n\n10:00.825 --> 10:05.974\n肺纤维化的发生与细胞外介质的异常沉积密切相关。\n\n10:07.440 --> 10:08.539\n在肺损伤后。\n\n10:09.452 --> 10:12.302\n成纤维细胞被激活转化为。\n\n10:13.184 --> 10:17.283\n肌成纤维细胞合成和分泌大量蛋白。\n\n10:17.684 --> 10:18.783\n胶原蛋白。\n\n10:19.848 --> 10:23.447\n纤维连接蛋白等细胞外介质成分。\n\n10:24.408 --> 10:30.208\n成纤维细胞的激活受到多种细胞因子和生长因子的调控。\n\n10:31.122 --> 10:35.973\n这些因子在肺纤维化的发生过程中至关重要。\n\n10:36.775 --> 10:39.924\n促进细胞外介质的过度合成与沉积。\n\n10:42.161 --> 10:46.310\n上皮细胞和成纤纤成纤维细胞相互作用。\n\n10:47.674 --> 10:54.223\n肺泡上皮细胞和支气管上皮细胞的损伤是肺纤维化的启动因素之一。\n\n10:54.723 --> 10:59.523\n上皮细胞损伤后可释放多种细胞因子和趋化因子。\n\n11:01.096 --> 11:04.245\n吸引成纤维细胞向损伤部位聚集，\n\n11:04.796 --> 11:09.846\n上皮细胞还可以通过上皮间质质转化过程，\n\n11:10.195 --> 11:13.695\n转化为具有成纤维细胞表型的细胞。\n\n11:14.442 --> 11:18.843\n进一步促进细胞外介质的沉积、合成与沉积。\n\n11:19.543 --> 11:25.343\n成纤维细胞在肺纤维化的发展过程中起着核心作用。\n\n11:26.140 --> 11:30.890\n炎症细胞的和上皮细胞释放的趋化因子。\n\n11:31.820 --> 11:32.070\n科。\n\n11:33.135 --> 11:36.385\n募集成纤维细胞向损伤部位迁移，\n\n11:36.786 --> 11:39.885\n成纤维细胞在损伤部位被激活，\n\n11:40.335 --> 11:43.736\n合成和分泌大量细胞外介质成分，\n\n11:44.135 --> 11:45.835\n形成成纤维灶，\n\n11:46.085 --> 11:49.585\n导致肺组织结构的破坏和功能障碍。\n\n11:50.742 --> 11:53.043\n免疫细胞的参与与炎症反应。\n\n11:54.047 --> 11:55.947\n巨噬细胞的极化与作用。\n\n11:56.672 --> 12:01.572\n巨噬细胞在肺纤维化的发展过程中至关重要。\n\n12:02.299 --> 12:03.650\n在肺损伤后，\n\n12:03.650 --> 12:07.200\n巨噬细胞可转换为M1型和M2型。\n\n12:08.197 --> 12:13.997\nM1型主要参与炎症反应、释放促炎因子等。\n\n12:14.047 --> 12:14.598\nM2型。\n\n12:15.603 --> 12:17.653\n具有促纤维化的作用。\n\n12:18.583 --> 12:23.432\n促进纤维细胞的激活和细胞外介质的沉积。\n\n12:24.033 --> 12:28.033\nT淋巴细胞在肺纤维化发展过程中。\n\n12:29.755 --> 12:31.205\n也起着一定的作用。\n\n12:32.112 --> 12:34.763\n它主要可以促进纤维化的进程。\n\n12:36.594 --> 12:40.594\n以及诱导炎症细胞转化和活化，\n\n12:40.695 --> 12:43.895\n加剧炎症反应和纤维化的程度，\n\n12:44.544 --> 12:48.145\n是肺纤维化发生发展的重要因素之一。\n\n12:49.442 --> 12:52.843\n肺癌的发病机制主要是基因突变、遗传。\n\n12:54.333 --> 12:57.632\n肺癌的发生和多种基因突变密切相关。\n\n12:58.885 --> 12:59.835\n原癌基因。\n\n13:01.283 --> 13:02.958\n在肺癌细胞细，\n\n13:02.958 --> 13:05.932\n在肺癌发生发展过程中至关重要。\n\n13:08.057 --> 13:09.581\n抑癌因基因，\n\n13:09.581 --> 13:12.307\n如T、P3、RB等，\n\n13:12.307 --> 13:16.106\n在维持细胞正常生长和分化过程中。\n\n13:16.890 --> 13:18.640\n起着至关重要的作用。\n\n13:19.877 --> 13:23.927\n慢性炎症是肺癌发生的重要危险因素之一，\n\n13:24.377 --> 13:29.226\n长期的慢性炎症可导致细胞的反复损伤和修复。\n\n13:30.065 --> 13:32.364\n增加细胞的基因突变概率。\n\n13:33.515 --> 13:38.116\n炎症微环境中存在着多种细胞因子和趋化因子。\n\n13:38.848 --> 13:44.249\n这些因子可促进肿瘤细胞的增殖、存活和侵袭。\n\n13:45.380 --> 13:50.380\n炎症微环境还可能诱导肿瘤干细胞的形成和维持，\n\n13:50.380 --> 13:52.479\n增强肿瘤的恶性程度。\n\n13:53.955 --> 13:57.056\n吸烟是肺癌发生的重要危险因素之一。\n\n13:58.083 --> 14:00.984\n香烟烟雾中含有多种致癌物质，\n\n14:01.434 --> 14:05.809\n这些致癌物质可直接损伤肺组织细胞的DNA，\n\n14:05.809 --> 14:07.234\n诱导基因突变。\n\n14:08.067 --> 14:09.043\n除了吸烟外，\n\n14:09.043 --> 14:15.218\n环境污染如石棉、空气污染等也与肺癌的发生密切相关。\n\n14:17.583 --> 14:20.408\n石棉纤维可长期存在肺组织中，\n\n14:20.408 --> 14:22.882\n引起慢性炎症和基因突变。\n\n14:24.734 --> 14:27.984\n急性呼吸窘迫综合征的发病机制。\n\n14:29.382 --> 14:32.182\n主要是炎症反应和肺泡毛细。\n\n14:33.284 --> 14:34.585\n毛细血管的损伤。\n\n14:40.375 --> 14:46.426\n它是以肺泡毛细血管损伤和急性呼吸衰竭为特征的严重疾病。\n\n14:47.026 --> 14:52.776\n炎症反应是急性呼吸窘迫综合征发病的核心机制之一。\n\n14:54.023 --> 14:58.723\n创伤的因素可激发免疫系统释放大量的炎症介质，\n\n14:59.072 --> 15:04.773\n可直接作用于肺泡毛细血管内皮细胞和肺泡上皮细胞，\n\n15:05.072 --> 15:07.572\n导致细胞损伤和功能障碍。\n\n15:08.539 --> 15:11.489\n炎症介质的作用导致肺泡细胞。\n\n15:13.223 --> 15:14.572\n血管屏障破坏。\n\n15:15.530 --> 15:17.280\n促进血管通透性增加，\n\n15:17.330 --> 15:19.505\n大量液体渗入细胞壁，\n\n15:19.505 --> 15:20.729\n导致肺水肿。\n\n15:22.692 --> 15:24.492\n氧化应激与细胞损伤。\n\n15:25.531 --> 15:26.481\n氧化应激。\n\n15:27.736 --> 15:29.036\n水平显著提高，\n\n15:29.135 --> 15:33.085\n炎症反应和缺氧再灌注损伤可导致。\n\n15:33.958 --> 15:34.307\n活性。\n\n15:35.403 --> 15:38.502\n氮和活性氧的大量产生，\n\n15:38.953 --> 15:41.103\n超过机体抗氧化的能力。\n\n15:41.856 --> 15:43.856\n从而导致脂质过氧化。\n\n15:44.770 --> 15:49.421\n蛋白质氧化修饰和DNA损伤影响细胞的正常生理功能。\n\n15:50.508 --> 15:50.734\n同时，\n\n15:50.734 --> 15:53.258\n氧化应激也会引起细胞损伤，\n\n15:53.258 --> 15:55.708\n导致细胞膜的完整性受损。\n\n15:56.635 --> 16:00.585\n细胞内酶的活性异常影响细胞的新陈代谢，\n\n16:01.085 --> 16:05.036\n严重的氧化应激可以诱导细胞凋亡，\n\n16:05.036 --> 16:07.335\n进一步加重肺组织的损伤。\n\n16:08.185 --> 16:13.236\n中性粒细胞在此疾病发生发展中同样至关重要，\n\n16:13.736 --> 16:16.486\n炎症介质可激活中性粒细胞。\n\n16:17.203 --> 16:18.953\n促进其向肺部浸润。\n\n16:21.679 --> 16:23.528\n直接损伤肺组织细胞，\n\n16:23.528 --> 16:27.729\n加重肺泡肺泡毛细血管屏障的破坏。\n\n16:28.278 --> 16:32.479\n巨噬细胞在疾病过程中也起着至关重要的作用。\n\n16:33.125 --> 16:39.026\n其释放的炎症因子可进一步刺激中性粒细胞和T淋巴细胞。\n\n16:40.872 --> 16:41.221\n关于。\n\n16:42.258 --> 16:45.533\n呼吸系统疾病的发病机制讲解到此结束，\n\n16:45.533 --> 16:46.359\n谢谢大家。\n\n","v0347cg10004d60shuqljht5i8b63e6g",1009,517,"2026-01-24 22:33:34","呼吸系统疾病的发病机制解析 - 病因、病理与防治  \n","呼吸系统疾病,发病机制,病因分析,病理过程,呼吸道感染,慢性阻塞性肺病,哮喘,肺炎,肺纤维化  \n","本文深入探讨呼吸系统疾病的发病机制，包括感染性、炎症性和结构性病变的病理过程，解析常见疾病如COPD、哮喘、肺炎的病因与防治策略，帮助理解呼吸系统健康的关键因素。","2026-03-04 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