Dissertation > Medicine, health > Internal Medicine > Heart, blood vessels ( circulatory ) disease > Heart disease > Arrhythmia > Atrial fibrillation and atrial flutter

Amiodarone Prevent Electrophysiological Changes of Acute Atrial Dilation Accompanied with Rapid Atrial Stimulation in Isolated Langendorff-perfused Rabbit Heart

Author YangYanHong
Tutor LiGuangPing
School Tianjin Medical University
Course Department of Cardiology
Keywords Atrial fibrillation Atrial dilatation Rapid stimulation Tachycardia Pressure Atrial effective refractory period Amiodarone
CLC R541.75
Type Master's thesis
Year 2005
Downloads 47
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The purpose of the isolated perfused rabbit heart , rapid atrial pacing and acute atrial dilation can cause atrial electrophysiological changes in short - term reversible , performance decreased atrial effective refractory period (AERP) , physiological rate of loss of adaptability , atrial fibrillation (AF ) increased susceptibility . While different atrial pressure level AERP decreasing level is different, can be induced by the type of arrhythmia are also different. Short - term changes in electrophysiological atrial conduction velocity change various reports , including conduction slowing, unchanged or extended . Common in clinical practice center room expansion , especially in the left atrium , and atrial dilatation with rapid atrial arrhythmia often coexist , atrial enlargement , and rapid atrial arrhythmias may have an important role in the occurrence and maintenance of AF . Amiodarone as a class Ⅲ antiarrhythmic drugs widely used in clinical . Acute and chronic administration of amiodarone and its mechanism is different from acute given to inhibit Na Ca 2 < / sup> , K channel , chronic administration of action potential duration (APD), ERP extended. The test by the isolated rabbit heart model aimed acute biatrial expansion while giving rapid atrial pacing , electrophysiological indicators AERP, AERP dispersion , atrial activation sequence , excited about the time change , and AF induced of AF electrophysiological mechanisms , as well as the effectiveness of amiodarone antiarrhythmic electrophysiological basis to provide further theoretical basis for the treatment of AF . 28 white rabbits establish langendorff perfusion of the isolated rabbit heart model , atrial septal perforating, ligation of the pulmonary artery , a pulmonary vein and superior vena cava cannulation were used to measure the right and left atrial pressure , inferior vena cava cannulation by changing its height adjustment double atrial pressure . Test is divided into three groups: ( 1 ) double atrial pressure increased successively as 0,6,12,20 cmH 2 O; (2) were given 10 minutes of rapid atrial biatrial pressure level

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