Adult Health 2: EKGs

Adult Health 2: EKGs - Term Definition Dysrhythmias-An...

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Term: Dysrhythmias Definition: -An irregularity/disturbance of normal electrical activity of the heart. -ALL influence performance of heart (usually for the worse). -The seriousness depends on specific nature of dysrhythmia AND underlying condition of patient. Term: Cardiac Conduction Definition: -SA Node: initiates rate (60-100bpm) -AV Node: relays atrial impulses to ventricles (40-60bpm) -Then pass thru Bundle of His at AV junction and continues thru interventricular septum thru the R/L bundle branches. -Then out to Purkinje fibers in the ventricular myocardium.
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Term: EKG Paper Definition: -1mm in size every 25 squares (5 squares x 5 squares) 5mm x 5mm box -1mm = 0.04 secs -5mm = 0.20 -Paper is "pulled" by machine past stylus which deflects in response to electrical activity of heart (action potential) and "writes" on paper Term: Vertical axis of EKG paper Definition: (height of waves) - measures voltage produced by heart. -voltage is NOT important to rhythm strip analysis (except in 12-lead EKG analysis)
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Term: 12-Lead EKG Definition: -Looks at heart from 12 different "angles" or "views" -Needed for diagnosis of heart muscle damage, enlargement of cardiac chamber, and interruption of some portion of cardiac conduction system. -Usually done at "single point in time" - like an x-ray. Term: Single Lead EKG Definition: "rhythm strip" is a print out of a single lead or view. -Less cumbersome as patient does not need to be connected to as many electrodes or wires. **Used for constant 24-hr monitoring in intensive care situations. -Usually sufficient for identifying BASIC DYSRHYTHMIAS (much info lost compared to 12-leads) Term: Ectopic Beats Definition: Interrupt the normal conduction sequence and may not initiate a normal muscle contraction.
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Term: Telemetry Definition: *Put underneath clavicles -White on Right -Clouds over Grass -Smoke over Fire -Christmas Tree on Bottom *Brown lead = Cardiac lead (goes to sternum) Term: Determining Heart Rate Definition: *Every 15 large blocks (3 secs) *Estimate of HR = # of "beats" in 2 of these 3 second intervals and multiply by 10. *There are 10 six-second intervals in one minute.
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Term: Dubin's Method determining HR Definition: *Relies on using large blocks on EKG paper. *Find QRS complex that falls on start of large block --> Count number of large blocks to next QRS complex *This tells you how many "fifths of a second" btw QRS complexes (each large block = 0.20 secs) Term: When can Dubin's Method be used? Why? Definition: *ONLY used when the heartbeat rhythm is REGULAR (each QRS complex is same distance apart). *Result you will get will vary depending on which 3 QRS complexes you choose to measure Term: What do the deflections seen on EKGs represent? Definition: The electrical depolarization of the atria and ventricles via the cardiac conduction system
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Term: What is an isoelectric line?
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