Presentation is loading. Please wait.

Presentation is loading. Please wait.


Similar presentations

Presentation on theme: "ELECTROCARDIOGRAM (ECG)"— Presentation transcript:

بسم الله الرحمن الرحيم Cardiovascular System Physiology Lab Interpretation Dr.Mohammed Sharique Ahmed Quadri Asst. professor in physiology ELECTROCARDIOGRAM (ECG)

2 objective Analyze the ECG and calculate the heart rate and cardiac axis. Know the importance of ST segment in IHD and MI. Apply knowledge of analyzing ECG on interpretation of sinus tachycardia, sinus bradycardia, AF, IHD, MI, heart block.

3 Analyzing individual waves & segments
P wave : upright except in avR Normal duration: 0.08 to 0.11 sec do you see p waves ? are all p waves same ? does all QRS complexes have p waves ? P-R interval : Normal range – 0.20 sec Is the PR interval constant ? If prolong indicates various blocks

4 Analyzing individual waves & segments
QRS complexes: Are the p waves & QRS complexes are associates with each other Are the QRS complexes narrow or wide ST Segment : Normal : Isoelectric Elevation : in acute MI Depression : in ischemia T wave: Tall T wave : ischemia, hyperkalemia Inverted : young children ,deep inspiration, bundle branch block, ischemia,hypokalemia

5 Analyzing individual waves & segments
QT INTERVAL: 0.4 to 0.43 seconds depending upon heart rate. At high heart rates, ventricular action potentials shorten in duration, which decreases the Q-T interval. . prolonged in acute MI ,hypocalcaemia

6 Variation in ST segment

7 ST Elevation One way to diagnose an acute MI is to look for elevation of the ST segment.

8 ST Elevation suggestive of MI

9 ST Elevation (cont) Elevation of the ST segment (greater than 1 small box) in 2 leads is consistent with a myocardial infarction.


11 Putting it all Together
Do you think this person is having a myocardial infarction. If so, where? Yes, this person is having an acute anterior wall myocardial infarction.

12 Now, where do you think this person is having a myocardial infarction?
Inferior wall MI

13 How about now? Anterior & lateral wall MI




17 Reporting of ECG This ecg shows Sinus rhythm Heart rate of 75/ min
Normal QRS axis Normal PR interval 0.12 sec Normal QRS duration 0.8 sec ST segment isoelectric in all leads T wave normal & upright in all wave except in aVR

18 Prof. Magdy El-Barbary


20 Prof. Magdy El-Barbary Question NO: Suggestive of What is the most likely cause of changes in ST seg. & T wave of each diagram?

21 ECG Changes Ways the ECG can change include: ST elevation & depression
Appearance of pathologic Q-waves T-waves peaked flattened inverted

22 References Text book of medical physiology by GUYTON & HALL 11 th edition Text book physiology by GANONG The ECG made Easy by John R.Hampton sixth edition The guide to EKGinterpretation by JohnA.Brose, D.O,John C.Auseon


Similar presentations

Ads by Google