A nurse is assessing a client who is scheduled for electroconvulsive therapy. Which of the following client health conditions should the nurse report to the provider?

Choice A reason: Rheumatoid arthritis is not a contraindication for ECT unless it involves cervical spine instability. It should be assessed but is not an immediate concern. Choice B reason: Kidney failure requires monitoring of fluid and electrolyte balance but is not a direct contraindication to ECT. Choice C reason: Congestive heart failure poses a significant risk due to the hemodynamic changes induced by ECT, including sympathetic stimulation and increased cardiac workload. This must be reported and evaluated. Choice D reason: Diabetes requires glucose monitoring but does not contraindicate ECT unless there are associated cardiovascular complications.