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electrocardiograms study guide

What does the ECG measure/record Cardiac electrical activity Repolarization (relaxing) and depolarization (contracting)
When will ECG be indicated Pt complains of chest pain, SOB, dyspnea with palpations, weakness, lathargy, and dizziness
How many seconds does the small squares represent .04 seconds
How many seconds does the large squares represent .2 seconds (5 smaller boxes)
What is the speed 25 mm/sec
What is cardiac electrophysiology basic arrythymia interpretations (why the impulses are doing what they are doing)
Trace the normal cardiac stimulus as it spreads through the atria and ventricles SA nodes, AV nodes, Bundle of HIS, R/L bundle branch, Purkinje fibers
Depolarization contracting When it goes up
Repolarization relexing when it goes down
Normal width of duration for QRS interval .05-.1 seconds
Normal width of duration for PR interval .12-.2 seconds
What is the noraml pace maker of the heart SA node
The rate of the SA node 60-100
Rate of AV node 40-60
rate of Bundle of branches 30-40
rate of Purkinje 30-40
2 nerve fibers within the right atrium that alter the HR when stimulated Parasympathetic and sympathetic
What does the Sympathetic do if stimulated speeds HR
What does the parasympathetic do if stimulated slows HR
Holter monitoring Monitor patient wears and takes home and tape records everything, patient tapes when symptom occurs
echocardiography ultrasound used to see heart and it's structure in motion (including valves)
Lubb heart sound heard when AV (mytral and tricuspid valves) close (LOUDER because pressure is higher in the left side of the heart)
Dubb heart sound heard when semilunar (pulmonatic and aortic valves) close
Murmur sound heard inbetween lubb and dubb When it's incompetent AV produces high pitched swooshing..... It is the backflow of blood through the AV into the atrium
Defibrillation setting for ventricular fibrillation energy level of 120-200 J for adults and 2-4 J for children
3 lead system for lead placement White on upper right Smoke over fire(gray over red) clouds over grass (white over green) Brown on ground
Created by: TnJFarrington12