DTPI Exam- ECGs with Questions and 100% Correct Verified Answers
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Course
DTPI
Institution
DTPI
What is isoelectric baseline?
Flat line just before P wave or right after T or U wave
Used to measure amplitude of specific wave
Movement above line= positive
Movement below line= negative
PR wave/interval
Very beginning on ECG
DTPI Exam - ECGs with Questions and 100% Correct Verified Answers What is isoelectric baseline? Flat line just before P wave or right after T or U wave Used to measure amplitude of specific wave Movement above line= positive Movement below line= negative PR wave/interval Very beginning on ECG -when P wave first rises to beginning of QRS complex PR segment -end of rise to start of Q -heart happy or not -should be close to isoelectric line ST Interval ST segment+T wave Following QRS to end of T wave *most important to know along with PR interval Tips for reading an ECG Rate -easiest to find R spikes in V2 1)Look for big spikes 2)Try to find big spikes that long on start of big squares 3)Find spike of next wave ( btw 2 spikes=RR interval) Rate, PR interval, QRS Example I Rate: 60 s (1 heart beat per second) PR: 0.2 s (200 msec) -(5 sm sq x 0.04) QRS duration/interval: 0.1 s (3 sm sq: 3 x 0.04= 0.12, rounded) QT Example 2 QT interval: 0.4 sec -9 sm sq x 0.04= 0.36 rounded to 0.4 Rate Example 3 Rate : Approx 94 -300/150/100, but just to R (so btw 100 and 75) *don't need to know exact number, just an idea QT interval Example 4 QT interval: 0.36 (approx 9 boxes - almost 0.4) Rate Example 5 Rate: approx 90 (just under 100) QT Example 6 QT interval : 0.32 (0.04 x 8) Leads on an ECG- BIPOLAR Standard: 12 leads -6 limb + 6 chest -2 electrode= 1 lead BIPOLAR LEADS Einthoven's Triangle Lead 1: horizontal R arm ( -) & L arm (+) Lead 2: R arm ( -) & L leg (+) Lead 3: L arm ( -) & L leg (+) 60 degrees each R leg is neutral Lead s on an ECG- UNIPOLAR UNIPOLAR aVR: R arm (+) & L arm/leg ( -) plugged in common ground aVL: L arm (+) & remaining 2 ( -) plugged in common ground aVF: L foot (+) & remaining 2 ( -) plugged in common ground 30 degrees each (different heart angles than I, II, III) Think of it as looking from your core Lateral vs Inferior Leads Lateral leads I + aVL Inferior leads II, III, aVF What is considered a normal axis? Thumbs up rule Two thumbs up=good Lead I and aVF should both be positive and leading upwards = POSITIVE AXIS Lead I -should be + as ventricle & L side of heart bigger **WANT IN PURPLE Example of different Axis
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