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electrocardiograms powerpoint notes
Question | Answer |
---|---|
EKG | inexpensive, noninvasive, and easy to obtain |
why do we use EKG | chest pain, SOB, dyspnea, weakness, lethargy, and dizziness |
What does EKG measure | cardiac activity,repolarization and depolarization IT DOES NOT measure force of contraction of the heart |
What is repolarization | resting.... positive outside of cell |
What is depolarization | contracting.....negative outside of cell |
What is the normal pacemaker of the heart | SA node (60-100 |
2nd pacemaker of heart | AV node (40-60) |
3rd pacemaker of heart | Bundle braches (30-40) |
4th pacemaker of heart | Purkinje (30-40) |
Cardiac electrical pathway | SA node, AV node, bundle of HIS, R/L bundle branch, Purkinje Fibers |
Nerve fibers within the Atrium | Sympathic (speeds HR) and parasympathetic (slows HR) when stimulated |
Segment | portion of the baseline |
Interval | contains at least one wave |
Rate calculation | count the number of large boxes between 2 R waves and then divide that number by 300 OR... memorize 300, 150, 100, 75, 60, 50 |
5 steps | rate, rhythym, p wave, pr interval, QRS complex |
To find HR | count R's then x by 10 |
S | below baseline.... |
Q | below baseline... 1st one |
R | Tallest point |
recording techniques for ECGS | normally 12 leads, 10 leads are attached |
holter monitoring | Used to take home and pt tape records when their palpation occurs |
Usual electrical setting for defibrillation on adult | 200-360 J |