Basic ECG & Arrhythmias PDF
Preview Basic ECG & Arrhythmias
Arrhythmias Basic ECG & Damrongg Sukitppunyyarojj,, MD EECCGG • 12 lead ECG • ECG strip ((RRhhyytthhmm ssttrriipp)) EECCGG • EECCGG sttriip • 1122 lleadd EECCGG – Limited information – Complete • RRatte, rhhytthhm, ++ information Ischemia • Rate, rhythm, axis, – EEaassyy ttoo ggeett hhyperttrophhy, • Monitor : Telemetry, ischemia, Defibrillator miscellaneous – Longer strip give – Takes more time more information – MMaayy nnoott oobbttaaiinneedd aabboouutt rrhhyytthhmm == from telemetry rhythm strip monitor Cardiac Cycle R SST T P Q PR SS QT interval P wave: Atrial contraction (<2.5 small box) PR interval: AV conduction time (< 1 large box) QRS complex: Ventricular depolarization(< 3 small box ) Twave: Ventricular repolarization FFiivvee AAssppeeccttss ffoorr EECCGG RReeaaddiinngg • Rate • Rhythm • AAxiis • HHyyppeerrttrroopphhyy • Infarction EECCGG PPaappeerr 5 big box = 1 sec 0.1 mV • ECG paper runs by a machine with the rate of 25 mm/sec •Standardization 10 mm = 1 mVolt 330000 11550000 RRaattee == //NN = //nn R R 0 1 300 150 100 75 60 50 43 กระดาษวิ่งดวยความเร็ว 25 mm ใน 1 วินาที ” ” 1 ” 1/ 25 = 0.04 ” ” ” 55 ” 00..004 x 55 = 00..2 ” จาก R ถึง R : 0.2 sec ได = 1 cardiac cycle 00 11 60 sec = 60/ 0.2 = 300/ 1 QQuuiicckk rraattee ddeetteerrmmiinnaattiioonn RRaattee = ???????? Marked Bradyycardia or Total Irreggular Rhyythm 3 second marks 6 second strip Rate = Cardiac cycle in 6 second strip x 10
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