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vagal stimulation (valsalva, carotid pressure), inflammation of SA node (rheu fever, myocarditis), factors released after MI (glutamic acid, aspartic acid, hyperkalemia)

Name 3 causative factors of bradycardia

acute inferior wall infarct, ischemia, low pO2, high pCO2, low pH, high BP, Sick Sinus Syndrome (alternates w tachy), digitalis toxicity

What are some important medical conditions that cause bradycardia?

digitalis, quinidine, drugs to treat hypertension, beta blockers

What drugs can cause bradycardia?

Sinus Bradycardia, Non Conducting Atrial Bigeminy, SA Block, AV block

What 4 heart conditions can cause bradycardia?

normal P, QRS and T. There is variance in the P to P (or R to R) cycle and a rate below 60.

What are the EKG findings for sinus bradycardia?

abnormal P wave due to ectopic atrial focus. QRS complex dropped when atrial signal hits the AV node during its refractory period. in bigeminy, this is every other beat.

What are the EKG findings for non-conducting atrial bigeminy?

pause in heart beats. escape beats seen are narrow, indicating they are junctional.

What are the EKG findings for sinoatrial node block?

sinus rhythm but with 2 atrial beats to 1 ventricular

What are the EKG findings of atrioventricular node block?

sawtooth P waves with rate of 250 to 250 beats per minute. QRS/ventricular rate is slow.

What are the EKG findings of atrial flutter with bradycardia?

even faster than atrial flutter, rapid p waves showing atrial quivering. Atrial beats up to 350 or 400. QRS/ventricular rate may be normal.

What are the EKG findings of atrial fibrillation with bradycardia?

bradycardia and tachycardia in addition to long pauses

What are the EKG findings of sick sinus syndrome?

if hemodynamically unstable, treat with atropine. can also treat w epinephrine, pacemaker.

When should bradycardia be treated? What drug is used?

aminophylline, thyroid, OTC's

What drugs cause tachycardia?

valvular diseases esp mitral, coronary artery disease, elev BP

What heart conditions can cause tachycardia?

starting+stopping abruptly

What does "paroxysmal" mean in terms of heart conditions?

treat the underlying cause

What is used to treat tachycardia?

100 to 250 beats per minute, short QRS (.10 sec or less), P wave may be absent, S-ST depression

What are the EKG findings of supraventricular tachycardia?

adenisin

What drug can treat Supraventricular tachycardia?

P wave replaced by F waves which are rapid fire irregular quiverings of the atria, normal QRS complex that is irregular in time. Much more chaotic than flutter.

What are the EKG features of atrial fibrillations with tachycardia?

mitral stenosis

What condition is suggested by a-fib and right axis deviation?

sawtooth P waves, normal QRS, P:QRS ratio can be 2:1 all the way up to 8:1 and typically 2:1 or 4:1. Much more regular, sharp waves than fibrillation.

What are the EKG findings of atrial flutter with tachycardia?

3 or more different P waves, PR interval varies, irregular rhythm

What are the EKG findings of Multifocal Atrial Tachycardia?

lung disease*, theophylline, catecholamines, electrolyte abnormality

What are the causes of Multifocal Atrial Tachycardia?

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