Name: Numer: Study group:
This text was supported by project FRMU no. MUNI/FR/1552/2015 (Faculty of Medicine, Masaryk University).
Protocol
Electrocardiography (ECG)
Method
Equipment:
Set of standard limb electrodes, 6 chest single-use electrodes with connectors to cables or
electrodes with fastening belt, connecting cables, PC, ECG gel, cotton-wool, examination bed,
ECG ruler.
Procedure:
Clean the skin of the examined subject with alcohol and spread ECG contact gel on the
electrodes. Place the single-use electrodes at the corresponding locations. Connect all
electrodes by connecting cables, which are marked with the respective letter and – in the case
of limb electrodes – the respective color.
The places for fixing the electrodes
Limb leads: red electrode: right hand wrist
yellow electrode: left hand wrist
green electrode: left foot
black electrode: right foot
Chest leads: V1 4th
intercostal space right from the sternum
V2 4th
intercostal space left from the sternum
V4 5th
intercostal space in the left medioclavicular line
V3 between V2 a V4
V5 5th
intercostal space in the left front axillar line
V6 5th
intercostal space in the left medial axillar line
Working with PC:
1. Launch the application ECG-Seiva (the icon with a heart)
2. Press Ins and set the name and surname of the experimental subject; the other values are
not relevant for this practical. Confirm by pressing CTRL+Enter. Press twice “Beru na
vědomí”.
3. By pressing F4 activate ECG recording.
4. Press F4 to start ten-second ECG recording; it is necessary for the experimental subject to
stay calm. Recording will terminate automatically.
5. Print the record by pressing F6.
6. To return to the main menu, press Alt+F4. To examine the next experimental subject,
repeat the procedure from step 2.
7. Terminate the program by repeatedly pressing Alt+F4
Name: Numer: Study group:
This text was supported by project FRMU no. MUNI/FR/1552/2015 (Faculty of Medicine, Masaryk University).
Evaluating an ECG record:
1. Heart rhythm:
 Regularity: Is the heart rhythm regular?
 YES (heart rhythm is regular)
 NO (heart rhythm is irregular)
 Rhythm source: Is each QRS complex preceded by P wave?
 YES (sinus rhythm)
 NO (idiopathic rhythm)
2. Heart rate:
 from PC:…………………………………………………………..
 calculation from paper speed (25 mm/s)……………………………
 evaluation according to ECG ruler………………………………..
3. Duration of:
 RR interval…………………………………
 PQ interval………………………………….
 QRS complex……………………………….
 QT interval………………………………….
Challenge: estimate the Sokolow-Lyon index [S wave (V1 or V2) + R (V5 or V6)]:
….……………………………………………………………………………………………….
(> 35 mm = left ventricle hypertrophy)
Name: Numer: Study group:
This text was supported by project FRMU no. MUNI/FR/1552/2015 (Faculty of Medicine, Masaryk University).
Construct electrical axis of the heart from two limb leads into the Einthoven triangle and
measure its angle in frontal plane. Assess its angle in horizontal plane from chest leads.
Conclusion
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