The nurse is caring for a client who receives a prescription for parenteral lidocaine. Prior to administering the medication, the nurse should review the medical record for which condition?

A. Diabetes mellitus: While diabetes mellitus can affect circulation and healing, it is not a direct contraindication for the use of lidocaine. However, monitoring for effects on circulation and neuropathy may be necessary in diabetic patients. B. Heart block: Lidocaine is a local anesthetic that can have systemic effects, especially on the cardiovascular system. It can cause conduction abnormalities, including heart block, so it is crucial to assess for this condition before administering lidocaine to avoid exacerbating cardiac issues. C. Gastric ulcers: Lidocaine's effects are primarily cardiac and neurological, and it does not have a known adverse effect on gastric ulcers that would require pre-administration review. This condition is more relevant for oral medications that can irritate the gastric mucosa. D. Glaucoma: Lidocaine does not have a significant effect on intraocular pressure or glaucoma. The main concern with lidocaine is its effect on the heart and nervous system, rather than its impact on eye conditions.