What is the main purpose of the Einthoven triangle in electrophysiology?
To locate the electrical axis of the heart
The Einthoven triangle is an equilateral triangle formed by the three standard bipolar limb leads (I, II, III) with the heart conceptually at its centre. Analysing the net QRS voltages projected onto this triangle lets us determine the mean electrical axis of the heart in the frontal plane.
It is not used to calculate heart rate, measure blood pressure or visualise chambers — those require rate counting on the rhythm strip, a sphygmomanometer and echocardiography respectively.
Hence, To locate the electrical axis of the heart.
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Important Questions from Basic Cardiovascular Investigations
Tall, peaked P waves on ECG are most commonly associated with:
What does the QT interval on a normal ECG primarily represent?
A patient presents with muscle weakness, and the ECG shows flattened T waves and prominent U waves. Which electrolyte imbalance is most probable?
Sinus bradycardia is associated with:
ST elevation in leads V1 to V4 most commonly indicates infarction of which wall of the heart?
