Kevin burns 5.5 cal/min by walking at a speed of 4.5 miles per hour. He is also able to have a conversation while performing this moderately intense physical activity. What effect does this activity have on his breathing and heart rate:

A. a slight change in his breathing but no change in his heart rate
B. no change in his breathing but a significant change in his heart rate
C. a significant change in both his breathing and heart rate
D. a slight increase in both his breathing and heart rate e. little to no change in his breathing and heart rate

A92-year-old man with a 45-year history of chronic obstructive pulmonary disease is intubated in the icu because of a bout of viral pneumonia that fails to improve after 72 hours of antibiotics. although the inspired fraction of oxygen is 100%, the patient's po2 remains at 57 mmhg. positive-end expiratory pressure (peep) is added to allow the inspired fraction of oxygen. twelve hours after the introduction of peep the patient suddenly become hypotensive. at the same time, his oxygen saturation drops from 92% to 61%. on physical examination, his bp is 80/50 mmhg and his pulse is 124/min. he has distended neck veins and distant heart sounds. which of the following would also most likely be seen on this patient's physical examination? - absence of breath sounds in the right hemithorax- high amplitude carotid artery upstroke- a pleural friction rub- pulsus alternans- splenomegaly