Please choose the correct ending to complete the given sentence: Health: [header] How to measure and record a pulse during first aid [title] Locate the pulse. [step] The most effective place to measure the pulse is on the inside of the patient's wrist. With your middle and index fingers, feel around on the patient's wrist.

Ending1: The pulse is usually strongest on the thumb side. When you feel a strong, steady pulse, hold your fingers there. Ending2: If there is a hard surface, it might be hard to detect the pulse. You should find the pulse if there is no pulse present. Ending3: It could be a cm-shaped bone attached to the wrist without tapping the test probe clockwise. [substeps] If you can't locate the pulse, proceed to the next step. Ending4: If the patient's wrist is stiffer, then the pulse is more likely to be there. [substeps] Do not use your middle or index fingers if the pulse is located on the outside of the wrist-loop.

Answer format: ending1/ending2/ending3/ending4