What best describes the cardiovascular and respiratory effects of immobility?

What best describes the cardiovascular and respiratory effects of immobility?

• A. It can lead to DVT and orthostatic hypotension, but respiration remains unaffected.
• B. It has no effect on the cardiovascular system but improves lung function.
• C. It only affects the respiratory system, not the cardiovascular system.
• D. It strengthens vascular regulation and reduces pneumonia risk.

Answer: (B)

Immobilization causes changes in both cardiovascular and respiratory systems. When a person isn’t moving, blood tends to pool in the legs, which raises the risk of deep vein thrombosis and can lead to orthostatic hypotension because the body’s usual reflexes for maintaining blood pressure with position changes become less responsive. On the respiratory side, inactivity leads to weaker chest and diaphragmatic movement, reduced lung volumes (like tidal volume and vital capacity), and slower clearance of mucus. This combination increases the likelihood of atelectasis and pneumonia. So, the idea that immobility leaves the cardiovascular system unchanged and improves lung function isn’t accurate. Inactivity typically stresses the heart and vessels and impairs lung mechanics, rather than enhancing them. The other notions that there’s no cardiovascular effect or that vascular regulation is strengthened, or that pneumonia risk is reduced, don’t fit with how immobility actually affects the body.

Immobilization causes changes in both cardiovascular and respiratory systems. When a person isn’t moving, blood tends to pool in the legs, which raises the risk of deep vein thrombosis and can lead to orthostatic hypotension because the body’s usual reflexes for maintaining blood pressure with position changes become less responsive. On the respiratory side, inactivity leads to weaker chest and diaphragmatic movement, reduced lung volumes (like tidal volume and vital capacity), and slower clearance of mucus. This combination increases the likelihood of atelectasis and pneumonia.

So, the idea that immobility leaves the cardiovascular system unchanged and improves lung function isn’t accurate. Inactivity typically stresses the heart and vessels and impairs lung mechanics, rather than enhancing them. The other notions that there’s no cardiovascular effect or that vascular regulation is strengthened, or that pneumonia risk is reduced, don’t fit with how immobility actually affects the body.