Please choose the correct ending to complete the given sentence: Health: [header] How to treat hyperthyroidism [title] Look for a change in heartbeat. [step] Because the hormone affects your heart rate, you can have a faster heartbeat, an irregular heartbeat, or a pounding heartbeat due to hyperthyroidism. You'll usually feel an irregular or pounding heartbeat, but you can check to see if your pulse is 100 bpm or more.

Ending1: Your heart rate is measured as bpm. It doesn't rise with exercise or activities you participate in, however, so if your heart rates rise above 100 bpm, you may have hyperthyroidism. Ending2: [substeps] To check your heart rate, find your pulse. Use a stopwatch to time 15 seconds while counting beats. Ending3: [substeps] If the pulse is over 100 bpm, this is a rapid heartbeat. Blood tests can detect bpm right off the bat. Ending4: You may also notice unusual heart palpitations or little warning beeps with increased heart rate. [substeps] Your heart rate will typically not spike or drop dramatically.

Answer format: ending1/ending2/ending3/ending4