Syndrome of inappropriate antidiuretic hormone secretion (SIADH) is characterized by hyponatremia, low serum osmolality, and clinical euvolemia in the absence of diuretic medication. And the causes of SIADH are various, antipsychotic agents and traumatic brain injury (TBI) are well known. Quetiapine is often chosen to manage the maladaptive behavior of patients with post-TBI. Although a previous study reported that quetiapine doses ranging from 25 to 300 mg were effective and tolerable, the symptoms of the patient might be aggravated. The symptoms of TBI such as nausea, malaise, headache, lethargy, and mild cognitive deficits are similar to those of SIADH. So the differentiation between SIADH and TBI may be difficult. This paper reports a case of SIADH in a patient with a TBI after using a small dose of 25 to 50 mg quetiapine.

The following Acknowledgments were unintentionally omitted from the publication.

The title compound, [Pt(CH3)(C10H5F2N2)(C10H6F2N2)], displays a distorted cis-PtN2C2 square-planar geometry around the PtII ion consisting of the bidentate C,N chelating anion, a monodentate N-bonded neutral ligand and a methyl group. In the crystal, the molecules are linked by C—H...F, C—H...N and C—H...π interactions. Time-dependent density functional theory (TD-DFT) at the B3LYP level with the 6–311++G(d,p) basis set was applied to optimize the ground-state geometry. The electronic properties, such as excitation energies and the HOMO–LUMO gap energies, were calculated and compared to related structures.

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