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WVSOM - Physio Word Scramble

 
 

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Question Answer
Arrhythmiaan abnormality of impulse initiation, impulse conduction or both
Normal automaticityarrhythmias associated with normal automatic pacemakers
abnormal automaticityarrhythmias associated with non pacemaker cells that develop automaticity
triggered activityoscillations in membrane potential that trigger an action potential
Normal SAN pacemaker60-100 bpm
Atrial conduction fibers60-80 bpm
AV junction40-60
Ventricular Purkinje20-40
True normal pacemakerSA node
What makes the latent pacemakers emerge?High parasympathetic tone High catecholamine concentration hypoxemia ischemia electrolyte distrbances drug toxicities
Abnormal automaticitytissue that is not normally automatic becomes automatic; often cannot be overdrive suppressed
Triggered activityearly afterdepolarizations delayed afterdepolarizations
EADoccur before full phase 3 repolarization
DADoccur after phase 3 repolarizations
DigoxinBlocks Na/K pump. Dig toxicity will lead to DADs and has increase in intracellular Na+ which will inhibit Na/Ca pump leading to increased Ca in the SR.
1st degree blockevery pulse conducts
2nd degree blocksome, not all pulses conduct
3rd degree blockno pulses conduct
2nd degree type IWenkebach; progressive prolongation thru the av node with an eventual dropped beat
2nd degree type IIMobitz II; dropped beats without the prolongation of the PR interval
2:1 Morbitz blockdropping every other beat. Every other P wave has a QRS
3:1 Morbitz3 P's for every QRS
What are some of the mechanisms that could contribute to block in the AV node?block Ca+ channel Increase vagal outflow Digitalis Hyperkalemia Adenosine
Re-entrycircus movement; an impulse that does not die out, it instead continues to circulate and re-excite tissue
Conditions that are necessary for re-entry to occur.1. unidirectional block, or transient block 2. slowed conduction over an alternate pathway 3. Proximal re-excitation
Re-entry may be promoted by ______________things that slow conduction velocity, shorten the refractory period or a combination of both
Examples of random re-entryVentricular Fibrillation
Is re-entry ordered or random?both
Re-entry may accur around _______ or it may be ______________.anatomical;functional
Classic example of re-entrywolff-parkinson-white syndrome
WPWpre-excitation; has an accessory pathway; result is supraventricular tachycardia
Pre-excitation shows what kind of wave?Delta wave
3 Examples of re-entryV-Fib A-Fib WPW