Answer:
count the number of beats in 15 seconds. Multiply this number by four
Explanation:
Warming up is important because you need to "warm up" your core and muscles and gets the blood flowing in preparation of a strenuous workout. It also helps prevent the risk of injury.
Stretching, walking, jogging, arm circles, lunges, squats and jumping jacks are good choices to include in a warm up
The best action that the nurse should take in this case is to initiate oxygen therapy.
<h3>What is oxygen therapy?</h3>
The term oxygen therapy refers to the means by which oxygen supplement is delivered to a patient. It is a means of helping a patient to breathe well.
In a case where a client who underwent surgery 12 hours ago and has difficulty breathing and has petechiae over his chest and complains of acute chest pain, the nurse needs to initiate oxygen therapy.
Learn more about oxygen therapy:brainly.com/question/6338370
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