A client arrives to the emergency room and is unable to give…

A client аrrives tо the emergency rооm аnd is unаble to give the registered nurse a health history due to altered mental status. The family reports the client has gained over 10 lbs in 1 week and says it is mainly “water” weight. In addition, they report the client hasn’t been able to urinate or eat within the past week as well and was recently diagnosed with small cell lung cancer. On assessment, the registered nurse note the client’s HR is 115 and BP 180/92. The client's sodium level is 90. Which of the following conditions do you suspect the client is most likely presenting with?