Step I PR-interval - What happens when there's no Q-wave?

[Lothric]

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Hey,

So for Wolff-Parkinson-White syndrome I stumbled upon this image in FA:

PR-interval is from P-wave to Q-wave. However, there is no Q-wave in that image (negative deflection prior to R-wave). How can PR-interval then be marked as it is in the image?

 

[Rahas]

PR interval is from the beginning of the P wave to the beginning of the QRS complex. QRS complexes arent always QRS; they might be just a Q, or QR, or RS (as in this case) etc

 

[Lothric]

PR interval is from the beginning of the P wave to the beginning of the QRS complex. QRS complexes arent always QRS; they might be just a Q, or QR, or RS (as in this case) etc

Thanks man