No, it is not possible to change the name of any treatment if it has been already added to the flowsheet. You should go through and delete all info in the cells from overnight and then add the right treatment and start over.
For example, a patient was admitted last night and received a liter bolus of Norm-R and was then switched to LRS. PLA was on the template, and that did not get changed. The option to change the name of the treatment after it was already done was not considered, for legal purposes. If someone was giving PLA all night, medical records should not have tampered after even a single treatment was executed. Consider either creating a template with the fluid of choice or change the fluid before the treatment begins.
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