Final answer:
a) Sinus tachycardia. The presence of a P-wave indicates the activation of the atria in the heart's electrical conduction system. Therefore, if there is a P-wave, the rhythm will be one of the Sinus Rhythms: Sinus tachycardia or Sinus bradycardia.
Step-by-step explanation:
The presence of a P-wave indicates the activation of the atria in the heart's electrical conduction system. In a normal sinus rhythm, the P-wave is followed by the QRS complex, which represents the activation of the ventricles.
Therefore, if there is a P-wave, the rhythm will be one of the Sinus Rhythms: Sinus tachycardia or Sinus bradycardia. Sinus tachycardia is characterized by a fast heart rate, while Sinus bradycardia is characterized by a slow heart rate.