what is the formular for calculating the total amount of fluids to be given to the patient
When calculating the fluid requirements of a patient, there are 3 elements to consider -
Replacement
Maintainance
Ongoing Losses
Replacements are calculated based on the level of dehydration. [ Dehydration is based upon clinical assessment of each individual patient. Most commonly, skin tent is used for assessment. To calculate the amount required for replacement within a 24 hour period, the percentage dehydration is used in the following calculation.
Replacement = % Dehydration x Bodyweight (kg) x 10
Maintainance is the basic rate which a patient requires during a 24 hour period. It is
commonly calculated as 50ml/kg/24hr, or 2ml/kg/hr.
Ongoing losses are calculated based on a predicted fluid amount lost by a patient within a 24 hour period. Common losses include vomitting and diarrhoea. It is often helpful here if the owners are able to give a detailed history as this makes it easier to predict the pattern of losses. In some patients there may be no ongoing losses and so this step can be skipped. To calculate the fluid requirement, the following calculation is used.
Ongoing losses = Amount per loss (ml/kg) x Bodyweight (kg) x No. of losses
These calculations are then added together to allow for the total fluid requirement in a 24 hour period. It is important to assess these requirements on a daily basis as losses may be increased/reduceed for example. ]
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Asked 6/18/2012 12:15:13 PM
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