A nurse is assisting in providing care for a group of clients who have coronary artery disease who are all scheduled for coronary artery bypass grafts (CABG). Which of the following clients is at the highest risk for complications following the surgical procedure?

A. A client who has CAD and COPD. COPD increases postoperative pulmonary complication risk (atelectasis, pneumonia, prolonged ventilation), raising overall CABG complication risk. B. A client who has CAD and Bell's palsy. Bell’s palsy affects facial nerve function but does not significantly increase surgical cardiopulmonary complication risk. C. A client who has CAD and chronic diverticulitis. Chronic diverticulitis can increase infectious risk if active, but it generally poses less immediate pulmonary/cardiac perioperative risk than COPD. D. A client who has CAD and chronic allergies. Chronic allergies rarely increase major surgical complication risk unless there is severe asthma or anaphylaxis history; COPD poses a greater threat.