In this ECG, the P waves are not clearly visible in most leads because they merged with the T waves. This can sometimes make it tricky to differentiate sinus tachycardia from other arrhythmias. However, if you look closely at lead aVL, you can see a distinct P wave, confirming that the rhythm is sinus.
When P waves aren’t obvious, always check multiple leads before ruling out sinus rhythm. Looking at different angles can make all the difference!

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