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Mohamad 💉🩺

@mohamadanashri

14 تغريدة 43 قراءة Oct 25, 2021

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راح نكمل اليوم
ECG basics part 2
للمختصين في المجال الصحي
كوب القهوة معاك ☕️ واستمتع ❤️

الثريد هذا مكمل للثريد السابق

Quick recap:
Leads take picture of heart
-inferior wall (II,III,aVF)
-lateral wall (I, aVL, V5, V6)
-right ventricle (V1, V2, aVR)
-anterior and septum (V1-V4)

ECG paper:
1 large box is 5mm high and 5mm in width.
5mm high equal (0.5 mv).
5mm width equal (0.2 sec).
high in ECG tells you how much voltage, width how much time.
1 large box contain 25 small boxes.
1 small box is 1mm high and 1mm width.
Every 3 sec in width➡️ 15 large boxes

How to read ECG paper?
1-Rate (too fast, too low or normal)
Normal rate (60-100 beat per min)
Below that ➡️ bradycardia
Above that ➡️ tachycardia
How to measure rate:
“6” method (count R waves and multiplying on 10 by using 6sec ECG strip ).

The second method:
Count how many large boxes between R wave and another:
If if one box ➡️300bpm
If it’s two boxes 300/2 ➡️150bpm
If it’s three boxes 300/3 ➡️100bpm
And so on...

2-Rhythm (regular or irregular):
P-R interval constant ➡️regular
P-R interval not constant ➡️irregular

3-QRS (narrow or wide):
If it’s greater than 3 small boxes (>0.12sec)➡️wide.
If less than that ➡️narrow

4-sinus P-wave presents?
-Upright p wave in lead II
-Inverts p wave in aVR
-Every P wave followed by QRS

5- PR interval (prolonged or normal):
If > 0.20 or more than 5 small boxes ➡️ prolonged
If < 0.20 or less than 5 small boxes ➡️normal

How to identify Tachycardia:
1- narrow + regular QRS:
⁃sinus tachycardia
⁃2:1 atrial flutter
⁃SVT
2- narrow + irregular:
⁃atrial fibrillation
⁃Variable A-flutter
⁃Multi-focal atrial tachycardia M.A.T

3- wide + regular:
⁃v-tach
⁃SVT with bundle branch block
⁃Sinus tachycardia with bundle branch block
⁃Antidromic W.P.W
4- wide + irregular:
⁃Polymorphic V-tach
⁃A-fib with W.P.W
⁃A-fib with Bundle branch block