ECG - 1

P wave represents

• ventricular depolarization
• atrial depolarization
• atrial repolarization
• ventricular repolarization

In a 12 lead ECG, the three limb electrodes contribute to how many leads

• 6
• 9
• 3
• 12

The sternal angle represents which intercostal space

• 5th
• 2nd
• 4th
• 3rd

This ----------- in ECG represents time delay between atrial and ventricular activation

• PR interval
• ST segment
• QRS complex
• QT interval

one small square in ECG paper strip is equal to ------- seconds

• 0.01 seconds
• 0.1 seconds
• 0.04 seconds
• 0.5 seconds

how many large squares are there in one second in ECG strip?

• 10
• 7
• 5
• 3

In a standard ECG paper, the ECG rhythm strip records ------- seconds

• 3 seconds
• 10 seconds
• 5 seconds
• 6 seconds

In a regular sinus rhythm, in an ECG strip,if the large squares between R - R interval is 5,the calculated heart rate is

• 50
• 70
• 80
• 60

In a irregular rhythm pattern,if the number of R waves over a 10 second period is 12,the calculated heart rate is

• 90
• 80
• 60
• 72

Where will you place the V₅ chest electrode?

• Left anterior axillary line at the same level as V4
• Left midaxillary line at the same level as V4
• Right anterior axillary line at the same level as V4
• Midclavicular line at the same level as V4