Arrhythmias Flashcards
which node is the heart’s natural pace maker?
SA node
where is the SA node
top of right atrium near the pulmonary artery
list the order of the conduction pathway
SA node right atrium AV node Bundle of His Right bundle branch/ventricle Lef bundle branch/ventricle purkinje fibers
What causes the ventricles to contract
Purkinje fibers
What happens during a heart beat (action potential and it’s respective place on the ECG)
Phase 0: ventricular depolarization due to influx of Na leads to ventricular contraction (QRS complex)
Phase 1: repolarization - Na channels close
Phase 2: influx of Ca and Efflux of K leads to a plateau
Phase 3: ventricular repolarization due to efflux of K (t wave)
phase 4: resting membrane potential - atrial depolarization (P wave)
Which part of the ECG representsw atrial contraction?
P wave
Which part of the ECG represents ventricular contraction/atrial relaxation?
QRS complex
Which part of the ECG represents ventricular relaxation?
T wave
What causes ventricular repolarization?
efflux of K
What causes ventricular depolarization/contraction?
influx of Na
What are the catagories of arrthymias?
supraventricular (above the AV node)
ventricular (below AV node)
What type of arrthymia is Afib?
supraventricular
what is the preferred treatment for ventricular fibrillation?
IV lidocaine
What are the Vaughan williams classifications of antiarrythmic drugs?
Double Quarter Pounder, Lettuce, Mayo, Fries, Please! Because Dieting During Stress Is Always Very Difficult
Class I: disopyramide, quinidine, procainamide, lidocaine, mexiletine, flecainide, propafenone
Class II: Beta-blockers
Class III: Dronedarone, Dofetilide, Sotalol, Ibutilide, Amiodarone
Class IV: Verapamil, Diltiazem
What type of drugs do we want to use in Afib
Rate Control: beta blockers or non-DHP CCBs, maybe digoxin
