Final answer:
Tachycardia is a condition characterized by a resting heart rate above 100 beats per minute. Patients with tachycardia may experience symptoms such as dizziness, rapid pulse, and heart palpitations.
Step-by-step explanation:
Tachycardia is a condition in which the resting heart rate is above 100 beats per minute. The symptoms that a patient with tachycardia may experience include dizziness, shortness of breath, lightheadedness, rapid pulse, heart palpitations, chest pain, or fainting (syncope). Therefore, the answer to the question is a) An erratic heart rate.