Final answer:
Tachycardia is a condition characterized by a resting heart rate above 100 beats per minute. It can be caused by various factors and may present symptoms such as dizziness and shortness of breath. Treatment options for tachycardia depend on the underlying cause.
Step-by-step explanation:
Tachycardia is the condition in which the resting heart rate is above 100 beats per minute (bpm). While the normal resting heart rate for adults is in the range of 60-100 bpm, there is considerable variation among individuals. Some causes of tachycardia include extreme stress, pregnancy, fever, anemia, hypoxia, hyperthyroidism, and exposure to radiation. Tachycardia may be accompanied by symptoms such as dizziness, shortness of breath, rapid pulse, chest pain, or fainting. Treatment for tachycardia depends on the underlying cause and may include medications, implantable cardioverter defibrillators, ablation, or surgery.