Abstract:Objective To analyze the level of serum calcium and the influencing factors of delirium in elderly patients with severe pneumonia complicated with delirium.Methods A total of 100 elderly patients with severe pneumonia admitted to the Affiliated Hospital of North China University of Technology from April 2017 to March 2018 were selected and divided into delirium group ( n=22) and control group ( n=78) according to whether delirium occurred.The concentrations of potassium(K),sodium(Na) and calcium(Ca) ions and the influencing factors of delirium were analyzed in two groups.Results After controlling the effects of gender,age,course of disease,body mass index,blood pressure,nutritional level,drinking history,diabetes history,coronary heart disease history,body temperature,white blood cells and blood glucose( P>0.05),the histories of insomnia,stroke,heart failure and dementia in delirium group were significantly higher than those in control group ( P<0.05).The level of Ca2+ in delirium group was lower than that in control group［(2.21±0.15) mmol/L vs (2.35 ± 0.09)mmol/L, t=5.534, P=0.000］,but there were no significant differences in serum potassium and sodium levels ( P>0.05).Logistic regression analysis showed that hypocalcemia,insomnia,stroke,dementia,cardiac insufficiency were the independent risk factors of delirium in elderly patients with severe pneumonia(P<0.05).ConclusionIn elderly patients with severe pneumonia complicated with delirium,the level of serum calcium is lower,and hypocalcemia,insomnia,stroke,dementia and cardiac dysfunction are the influencing factors of delirium.