中国药理学与毒理学杂志
中國藥理學與毒理學雜誌
중국약이학여독이학잡지
CHINESE JOURNAL OF PHARMACOLOGY AND TOXICOLOGY
2014年
4期
503-509
,共7页
刘洋%戴琳%张远恒%王金丽%张存泰%薛玉梅%吴书林%胡丹%喻荣辉%刘念%白融
劉洋%戴琳%張遠恆%王金麗%張存泰%薛玉梅%吳書林%鬍丹%喻榮輝%劉唸%白融
류양%대림%장원항%왕금려%장존태%설옥매%오서림%호단%유영휘%류념%백융
维拉帕米%2 型长 QT 综合征%跨壁复极离散度%尖端扭转型室速
維拉帕米%2 型長 QT 綜閤徵%跨壁複極離散度%尖耑扭轉型室速
유랍파미%2 형장 QT 종합정%과벽복겁리산도%첨단뉴전형실속
verapamiI%type 2 Iong QT syndrome%transmuraI dispersion of repoIarization%torsades de pointes
目的:探讨维拉帕米治疗2型长 QT 综合征(LQT2)的作用机制。方法制备兔左心室楔形心肌块,稳定1 h 后灌注 E-40310.5μmoI·L-1建立 LQT2心肌块模型;同时按照分组分别灌注维拉帕米0.5,1.0和2.5μmoI·L-1,30 min 后开始采集数据,采集时间持续30 min。以2000 ms 基础步长连续起搏(S1S1刺激),同步记录心内、外膜下心肌的跨膜动作电位和跨壁心电图,测量动作电位复极达90%的时程(APD90)、跨壁复极离散度(TDR)和心电图 QT 间期,并观察各组自发和程序刺激(S1S2刺激)诱发的早期后除极(EAD)和尖端扭转型室速(TdP)的发生率。结果灌注 E-40310.5μmoI·L-1后,左心室楔形心肌块心内、外膜下 APD90和 QT 间期均显著延长(P﹤0.01),TDR 显著增加(P﹤0.01),并观察到自发或程序刺激诱发的 EAD 及 TdP 发作。同时灌注维拉帕米0.5,1.0和2.5μmoI·L-1,LQT2模型内、外膜下心肌 APD90和 QT 间期呈浓度依赖性地缩短(P﹤0.01),TDR 显著减小(P﹤0.01),自发或程序刺激诱发的 EAD 和 TdP明显受到抑制。硝苯地平1.0μmoI·L-1有类似作用,且强度更大。结论维拉帕米可通过缩小心肌 TDR 和抑制 EAD 减少 LQT2患者 TdP 的发生。
目的:探討維拉帕米治療2型長 QT 綜閤徵(LQT2)的作用機製。方法製備兔左心室楔形心肌塊,穩定1 h 後灌註 E-40310.5μmoI·L-1建立 LQT2心肌塊模型;同時按照分組分彆灌註維拉帕米0.5,1.0和2.5μmoI·L-1,30 min 後開始採集數據,採集時間持續30 min。以2000 ms 基礎步長連續起搏(S1S1刺激),同步記錄心內、外膜下心肌的跨膜動作電位和跨壁心電圖,測量動作電位複極達90%的時程(APD90)、跨壁複極離散度(TDR)和心電圖 QT 間期,併觀察各組自髮和程序刺激(S1S2刺激)誘髮的早期後除極(EAD)和尖耑扭轉型室速(TdP)的髮生率。結果灌註 E-40310.5μmoI·L-1後,左心室楔形心肌塊心內、外膜下 APD90和 QT 間期均顯著延長(P﹤0.01),TDR 顯著增加(P﹤0.01),併觀察到自髮或程序刺激誘髮的 EAD 及 TdP 髮作。同時灌註維拉帕米0.5,1.0和2.5μmoI·L-1,LQT2模型內、外膜下心肌 APD90和 QT 間期呈濃度依賴性地縮短(P﹤0.01),TDR 顯著減小(P﹤0.01),自髮或程序刺激誘髮的 EAD 和 TdP明顯受到抑製。硝苯地平1.0μmoI·L-1有類似作用,且彊度更大。結論維拉帕米可通過縮小心肌 TDR 和抑製 EAD 減少 LQT2患者 TdP 的髮生。
목적:탐토유랍파미치료2형장 QT 종합정(LQT2)적작용궤제。방법제비토좌심실설형심기괴,은정1 h 후관주 E-40310.5μmoI·L-1건립 LQT2심기괴모형;동시안조분조분별관주유랍파미0.5,1.0화2.5μmoI·L-1,30 min 후개시채집수거,채집시간지속30 min。이2000 ms 기출보장련속기박(S1S1자격),동보기록심내、외막하심기적과막동작전위화과벽심전도,측량동작전위복겁체90%적시정(APD90)、과벽복겁리산도(TDR)화심전도 QT 간기,병관찰각조자발화정서자격(S1S2자격)유발적조기후제겁(EAD)화첨단뉴전형실속(TdP)적발생솔。결과관주 E-40310.5μmoI·L-1후,좌심실설형심기괴심내、외막하 APD90화 QT 간기균현저연장(P﹤0.01),TDR 현저증가(P﹤0.01),병관찰도자발혹정서자격유발적 EAD 급 TdP 발작。동시관주유랍파미0.5,1.0화2.5μmoI·L-1,LQT2모형내、외막하심기 APD90화 QT 간기정농도의뢰성지축단(P﹤0.01),TDR 현저감소(P﹤0.01),자발혹정서자격유발적 EAD 화 TdP명현수도억제。초분지평1.0μmoI·L-1유유사작용,차강도경대。결론유랍파미가통과축소심기 TDR 화억제 EAD 감소 LQT2환자 TdP 적발생。
OBJECTlVE To investigate the mechanism of verapamiI in the treatment of type 2 Iong QT syndrome(LQT2)using a rabbit Ieft ventricuIar myocardiaI wedge preparation. METHODS E-4031 (0.5 μmoI·L-1 )was used to induce the LQT2 modeI after rabbit Ieft ventricuIar wedge preparations were equiIibrated for 1 h,and verapamiI(0.5,1.0 and 2.5 μmoI·L-1 ,respectiveIy)was perfused in different groups. Data were coIIected for a period of 30 min starting 30 min after adding the respective drug. Transmembrane action potentiaIs of endocardiaI and epicardiaI myocardium were recorded simuItaneous-Iy at a basic cycIe Iength of 2000 ms(S1S1)together with a transmuraI ECG. The effect of verapamiI (0.5,1.0 and 2.5 μmoI·L-1 )on action potentiaI duration at 90% repoIarization(APD90 ),QT intervaI, transmuraI dispersion of repoIarization(TDR)and the deveIopment of earIy afterdepoIarization(EAD) and torsades de pointes(TdP)were evaIuated in the LQT2 myocardiaI wedge modeI. RESULTS E-4031 (0.5 μmoI·L-1 )markedIy proIonged endocardiaI and epicardiaI APD90 and QT intervaI( P﹤0.01),and dramaticaIIy increased TDR(P﹤0.01). Spontaneous or programmed eIectricaI stimuIation-induced EAD and TdP were aIso observed in the modeI. VerapamiI(0.5,1.0 and 2.5 μmoI·L-1 )dose-dependentIy abbreviated endocardiaI and epicardiaI APD90 and QT intervaI(P﹤0.01),significantIy decreased TDR(P﹤0.01),and suppressed EAD and TdP in the LQT2 modeI. Concordant but stronger effects on the eIectro-physioIogicaI properties of the LQT2 modeI were noticed when nifedipine was perfused. CONCLUSlON VerapamiI inhibits TdP in the LQT2 modeI by reducing TDR and suppressing EAD.