Cardiac Cycle and Electrocardiogram

Where is V1 located?

• 4th intercostal space at the left margin of sternum

• 4th intercostal space at the right margin of sternum

• 5th intercostal space at mid clavicular line

• 3rd intercostal space at mid axillary lline

This wave indicates repolarisation of ventricles

• T waves

• U waves

• P waves

• Q waves

The only time when all of the valves in the heart are close is during

• ventricular diastole

• isovolumetric contraction

• artrial systole

• isovolumetric diastole

During isovolumetric ventricular contraction

• closure of semilunar valves

• closure of AV valves

• rushing of blood into ventricles

• contraction of atrial musculature

Aortic pressure at its peak during

• arterial systole

• isovolumetric contraction

• ventricular ejection

• isovolumetric relaxation

One small square on ECG tracing paper _______

• is 1 mm by 1 mm

• represents 0.04 seconds

• represent 0.1mV

Represents the early part of ventricular repolarisation

• QT interval

• PR interval

• ST segment

If ventricular pressure is low, what will happen to the arterioventricular valves?

• close

• open

Name the lead

• aVF

• aVR

• aVL

• aVS

The relation with ECG, during third heart sound,

• coincides with R wave

• coincides or after submit of T waves

• between T & P wave

• between P and Q wave