A nurse is providing care for a client who is scheduled for electroconvulsive therapy. Which of the following conditions should the nurse identify as an increased risk for complications?

Rationale: A. Diabetes mellitus: Diabetes is not a direct contraindication or risk factor for complications from electroconvulsive therapy (ECT). Blood glucose should be monitored, but it does not increase procedural risk. B. Subdural hematoma: A subdural hematoma increases the risk of complications during ECT because the induced seizure can elevate intracranial pressure, potentially worsening the hematoma or causing neurological deterioration. This is a significant safety consideration. C. Hyperthyroidism: While hyperthyroidism can affect cardiovascular response, it is not as high-risk as intracranial pathology. Pre-procedure assessment may include thyroid function evaluation if indicated. D. Renal calculi: Kidney stones do not increase the risk of ECT complications. This condition is unrelated to seizure induction or anesthetic considerations.