A nurse is reviewing the laboratory results of a client who is postoperative and has a respiratory rate of 7/min. The arteriaI blood gas (ABG) values include:

• pH 7.22
• PaCO2 68 mm Hg
• Base excess -2
• PaO2 78 mm Hg
• Oxygen saturation 80%
• Bicarbonate 28 mEq/L

Which of the following interpretations of the ABG values should the nurse make7

A. Infection: While infection can certainly delay wound healing and contribute to the development of chronic wounds, it is more of a local factor rather than a systemic cause. Infections can hinder the normal healing process and lead to tissue damage, inflammation, and prolonged wound healing.

B. Malnutrition

A chronic wound is a wound that fails to progress through the normal stages of healing in an orderly and timely manner. Systemic factors can significantly impact wound healing, and malnutrition is one such systemic cause. Malnutrition, which refers to an inadequate intake or absorption of nutrients essential for healing, can impair the body's ability to repair tissues, fight infection, and generate new cells.

C. Continued pressure: Prolonged pressure, such as that experienced in pressure ulcers, can lead to tissue ischemia (lack of blood flow) and tissue necrosis, resulting in chronic wounds. However, this is considered a local factor related to the specific site of the wound and pressure-related damage.

D. Venous insufficiency: Venous insufficiency can cause chronic wounds, particularly venous ulcers, due to impaired venous return leading to increased pressure in the veins of the lower extremities. This pressure can result in tissue damage and poor wound healing. While venous insufficiency is a systemic condition, it primarily affects specific areas of the body (such as the lower legs) and is more directly related to the development of localized chronic wounds in those areas.

A. Arrange for the patient to receive gamma globulin.

Gamma globulin is a blood product that contains antibodies and is sometimes used for post-exposure prophylaxis in certain situations, such as for individuals who are immunocompromised or pregnant and have been exposed to varicella (chickenpox) or measles. However, for a frail, older adult who had chickenpox as a child and has been exposed to varicella again, arranging for gamma globulin may not be necessary if the patient is already immune to chickenpox.

B. Assess frequently for herpes zoster.

Herpes zoster (shingles) is caused by the reactivation of the varicella-zoster virus, the same virus that causes chickenpox. While exposure to varicella can increase the risk of developing shingles in individuals who are susceptible, frequent assessment for herpes zoster is not necessary in this case if the patient is known to have had chickenpox in the past.

C. Be aware of the patient's immunity to chickenpox.

This option is the correct choice. Since the patient had chickenpox as a child, they likely have immunity to chickenpox. Being aware of this immunity helps the nurse understand that the patient may not develop chickenpox again even after exposure to varicella.

D. Encourage the patient to have a pneumonia vaccine.

Encouraging the patient to have a pneumonia vaccine is unrelated to the immediate concern of exposure to varicella. While pneumonia vaccines are important for older adults, especially those who are frail, the priority in this scenario is to determine the patient's immunity to chickenpox due to prior infection.