Influence of weather conditions, drugs and comorbidities on serum Na and Cl in 13Â 000 hospital admissions: Evidence for a subpopulation susceptible for SIADH

Na and Cl at hospital admission are highly influenced by ambient weather conditions, comorbidities and medication. The bimodal distribution of Na and Cl in persons exposed to risk factors for SIADH suggests that SIADH may only affect a genetically distinct vulnerable subpopulation.