Please choose the correct ending to complete the given sentence: Health: [header] How to set up a 12 lead ekg [title] Tell your doctor about all medicines you are taking. [step] This is important because some medicines change the rate at which your heart beats and could affect the results. This includes over-the-counter medications and herbal supplements.

Ending1: [substeps] First, find out what medications the doctor used. Follow the list to watch for side effects. Ending2: [substeps] Your doctor may ask you to describe all components of the medication, so explain which one or more of them you need. Following this example, how many medications you take might impact your results. Ending3: [substeps] Do not drink cold water right before the test. You need to stay warm so that you do not shiver. Ending4: Most commonly, your doctor will decide the dose, and use a controlled dosage to affect the results of your ekg. [substeps] Don't hesitate to talk to your doctor about how to comfortably adjust the dose depending on the type of medicine you take.

Answer format: ending1/ending2/ending3/ending4