You see that your last appointment for the day is "Princess," the 14-year-old DSH calico that you have worked with since kittenhood. You remember that she was a very cute kitten, but it all went downhill from there. Like most other calico cats and animals named Princess, Baby, or Precious, she is not very nice. Every exam after her OHE has been very brief or sedated. Over the years, she has become obese and suffered from many urinary tract infections.

Today, she is coming in for lethargy, which makes you wonder how much she really moves around anyway since her last recorded weight 4 months ago was 19 lbs. Since the vet is scared of Princess, you go into the room first to get a history and weight. When you get into the exam room, you immediately know something is wrong. Princess is sitting on the exam table and actually lets you pet her! Her weight today is 13 lbs, her HR is 160, RR is 40, and her sclera and mucus membranes are icteric.

1. What percent of her body weight has Princess lost?

You know that Princess is Mrs. Sweet's entire world, so you take her back to the vet, who confirms feline hepatic lipidosis. You collect full bloodwork and place an IVC. It makes you a little sad that Princess is feeling too sick to put up a fight. You have a 1 L bag of fluids to which you have to add 15 mEq of potassium chloride (KCl). KCl comes in 2 mEq/ml.

2. How much will you add to the bag?

3. You start the fluids at 5 ml/kg/hr. What is the rate in mls/hr?

4. How many mEq of KCl is Princess getting each hour?

Princess has lost about 31.6% of her body weight. For administering Potassium Chloride (KCl), we need to add 7.5ml to the bag of fluids. The rate of fluid is 29.5 ml/hr and Princess receives 0.44 mEq/hr of KCl.

Explanation:

To determine the percentage of body weight that Princess has lost, we'll need to subtract her current weight from her previous weight to get the amount of weight lost. So, 19lbs - 13lbs = 6lbs. To find the percentage, we divide the weight lost by the original weight and then multiply by 100, which gets us to (6lbs / 19lbs) * 100 = 31.58%, rounded to approximately 31.6%.

The next part involves the administration of potassium chloride (KCl). As it comes in 2mEq/ml, to get 15mEq, you need 15/2 = 7.5ml added to the bag of fluids.

Finally, to determine the rate in ml/hr of fluids, since the rate determined is 5ml per kg per hour and Princess's current weight is 13lbs (which is about 5.9 kg when converted), the rate comes out to be 5.9 ˣ 5 = 29.5 ml/hr. Given the dilution, the amount of KCl Princess gets each hour is 15mEq per L ˣ 29.5 ml/hr = 0.44 mEq/hr.

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