Vertical axis

A vertical axis means that the overall direction of ventricular depolarisation is straight downwards (head to toe). This direction is also known as +90 degrees. If the axis is vertical, Lead I will be isoelectric and aVF positive.

A vertical axis is classically caused by chronic lung disease, but there are other causes.

See also: Axis

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References

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In the ECGquest archives, this ECG has been tagged with: - Bradycardia Vertical axis Inverted T waves Sinus bradycardia 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 28th January 2019 – Interpretation

This ECG is from a teenage girl who presented with ongoing weight loss (BMI 13) and a known eating disorder.

This ECG shows sinus bradycardia (36) and T wave inversion in V1-2 and aVL.