Haha, really? Amplitude of the U wave? What is this, amateur hour? I bet the person who wrote that answer option has never even seen a proper ECG in their life.
Looks like the exam writers are trying to trip us up with those other options, but the correct answer is definitely A. Gotta keep your wits about you on these tests!
I can't believe they're even asking this. The QRS complex and P waves are the bread and butter of ECG interpretation. Anyone who's been in the field for more than a week should know this!
The duration and width of the QRS complex, along with the presence or absence of P waves, are the key factors in differentiating supraventricular and ventricular rhythms. This one's a no-brainer!
Ellsworth
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