A wilderness firefighter has just completed 12 hours of fighting a forest fire.

Question

A wilderness firefighter has just completed 12 hours of fighting a forest fire. She followed procedure carefully by drinking water or Gatorade every hour for the 12 hours but towards the end of those 12 hours... She overheated and vonited twice, losing both tluid and ions. Afer wards, she eshilbited signs of a posible osmotic os mbalance. Answer the following questions based on this situation After vomiting, she was treated by local drinking the water did the firefighter increase or decrease her body osmolarky? paramedics who gave her 500 ml of water to drink. By a. b. At the end of the 12 hours and even after drinking the water, she continued to exhibit symptoms cf a possible osmotic imbalance. She was taken to the hospilal where the measures shown on the chart below were determined. Fill in the remainder of the chart. (Be sure to include units) Total 30 liters body ECF 10 liters ICF 20 liters Volume solute amount osmolarily 2600 mosnoles 260 mOsM c. Based on the information above, the firefighter is hyposmotic, isosmotic or hyperosmotic relative to d. The emergency room health care team disagrees about which V solution to give the firefighter. Her osmolarity low, and her body weight and blood pressure ini ates that she is a Rtle dehydrated needs some d în cells Refer to the list of IV solutions on page 156, Table 5-9 For a normal person, the table below shows how body osmolarity changes (ncrease, no change or decrease) and which way water moves when each IV fluid is added to the body. .: Normal person (OsM-285-295 mOsM. ísomotic to normal saine and to 5 % gkcoe) IV Flui 0.9% NaCl (normal saline) 0.45% NaCl 5% glucose in 0 45% NaCl 5% glucose in 0.9% Naa Change in OsM? N/C Water mo NIC into ICF into ICF N/C Which IV fluid would you choose for the firefighter and why?

Explanation / Answer

Since, no electrolytic solutes were supplied externally,

drinking of water increased the volume.

We know that Osmolarity = amount of solute/ volume

ie, when solute is constant,

increase in volume causes decrease in osmolarity.

Hence, the osmolarity will decrease.

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