Final answer:
Venipuncture in older patients carries risks such as varicose veins, edema, increased possibility of blood vessel injury, and heightened risk of infection, potentially leading to serious complications like sepsis.
Step-by-step explanation:
When performing venipuncture on an older patient, several complications can arise due to the physiological changes that occur with aging. Older patients may have varicose veins or edema, which can make venipuncture more difficult and increase the risk of infection. Moreover, the skin and blood vessels of older patients are generally more fragile, which can lead to a higher risk of blood vessel injury and hematoma formation. Additionally, there's a concern for potential infection if the venipuncture site is not properly sterilized or if the patient's immune system is compromised. This is especially important as bloodstream infections can be severe, sometimes leading to sepsis and even death, as highlighted by the case of Barbara who was suffering from cancer and developed complications including shock and organ failure.