Alleles for a particular phenotype determine what characteristic an organism will express, as with the following example where. 1  Chromosome 1 contains an allele for blonde hair. 2  Chromosome 2 contains an allele for brown hair. 3  Chromosome 3 contains an allele for blue eyes. 4  Chromosome 4 contains an allele for brown eyes.
Because of the patient's smoking history and abnormal chest radiograph, a neoplasm was initially suspected as a cause of SIADH. The head trauma was too remote to be of concern. Although 1 case of risperidone-associated hyponatremia has been reported, the risk seems low with this agent and with olanzapine.
Alcohol Consumption and Hyponatremia. One major cause of sodium depletion is liver cirrhosis. Cirrhosis -- or reduced liver function and liver scarring -- can be caused by long-term alcohol abuse. Hyponatremia can also be caused by vomiting and increased urination, both of which can be side effects of alcohol consumption. Dehydration -- which can result from drinking alcohol -- may also lead to sodium depletion. Other Causes of Hyponatremia Hyponatremia is an electrolyte disorder caused by an imbalance of water and salt levels in the body.