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💊 Pharmacology · Lesson 5 of 6 · 8 min

IV Fluids, Potassium Rules and the First 15 Minutes of a Transfusion

🩸 Potassium is never, ever pushed IV. The worst transfusion reactions usually start early, so the nurse stays for the first 15 minutes. Blood runs only with normal saline. Three rules, each written in someone's death certificate.

💡 Key idea

Potassium is diluted and pumped, never pushed, and needs urine output. Blood runs with normal saline only, two-nurse check, first 15 minutes at the bedside, done within 4 hours. Reaction: stop, saline, notify.

🧠 Why it matters

ISOTONIC fluids (0.9% saline, lactated Ringer's) expand the vascular volume for dehydration, hemorrhage and shock. HYPOTONIC fluids (0.45% saline) move water into cells for cellular dehydration, but never in increased intracranial pressure or hypotension. HYPERTONIC fluids (3% saline, D10W) pull water out of cells; 3% saline is used for severe hyponatremia with careful monitoring. POTASSIUM: never IV push, always diluted and given by pump; peripheral rates are commonly limited to about 10 mEq/hr, with higher rates only through a central line on a monitor; check urine output first, because potassium is excreted by the kidneys. Monitor IV sites for INFILTRATION (cool, swollen, pale) and PHLEBITIS (warm, red, cord-like); stop the infusion, remove the catheter and restart elsewhere. For vesicants that EXTRAVASATE, stop the infusion, disconnect the tubing, aspirate from the catheter, then remove it (unless policy says to give an antidote through it first). Elevate the limb, notify the provider, and use warm or cold compresses as the specific drug requires. BLOOD: two licensed nurses verify the client, the blood type and the unit at the bedside; use only normal saline and a filtered tubing; start slowly and stay with the client for the first 15 minutes; take vital signs before, at 15 minutes and after; complete within 4 hours of leaving the blood bank. For any reaction (fever, chills, back pain, dyspnea, hives, hypotension): STOP the transfusion, keep the IV open with new saline tubing, notify the provider and blood bank, and send the bag and tubing back.

🏥 In the real world

⏱️ Ten minutes into a unit of packed cells, a client says her back hurts and she feels hot. The nurse stops the transfusion, disconnects the blood tubing, hangs new saline, takes vital signs and calls the provider and the blood bank. The blood bag goes back for testing. She does not 'slow it down and watch'; the exam's correct answer always starts with stop.

📌 Takeaways

  • Isotonic for volume, hypotonic for cells (never in raised ICP), hypertonic pulls fluid out of cells
  • Potassium: diluted, pumped, max about 10 mEq/hr peripherally, urine output first
  • Transfusion: 2 nurses, saline only, stay 15 minutes, 4-hour limit; reaction means stop

📖 Terms in this lesson

Extravasation: Leakage of a vesicant (tissue-damaging) IV drug, such as some chemotherapy, into the tissue around the vein; a non-vesicant leak is infiltration.

Transfusion reaction: Fever, chills, back pain, hives or hypotension during a blood transfusion; stop the blood and keep the line open with saline through new tubing.

Isotonic solution: An IV fluid such as 0.9% saline or lactated Ringer's that expands the blood volume without shifting water into or out of cells.

Hypotonic solution: An IV fluid such as 0.45% saline that moves water into cells, never used with increased intracranial pressure.

Potassium chloride: Replaces low potassium but stops the heart if it goes in too fast: never IV push, always diluted and run by pump (about 10 mEq an hour through a peripheral line), with urine output confirmed first; oral doses are taken with food and water.

Albumin (IV colloid): A colloid made from pooled human plasma that pulls fluid back into the vessels in shock, burns, large-volume paracentesis and low protein states; it needs no cross-match, but watch for circulatory overload (crackles, dyspnea, rising pressure) and allergic reactions during the infusion.

✅ Test yourself

An order reads 'potassium chloride 40 mEq IV push now.' What should the nurse do?
  1. Give it through a central line
  2. Give it slowly over 2 minutes
  3. Dilute it and give it over 10 minutes
  4. Question the order

Answer: D · Question the order

IV push potassium causes fatal arrhythmias. It must always be diluted and infused by pump at a controlled rate.

Five minutes into a blood transfusion the client develops chills, flank pain and hypotension. What is the nurse's first action?
  1. Administer acetaminophen
  2. Stop the transfusion and keep the vein open with normal saline using new tubing
  3. Notify the blood bank before touching the infusion
  4. Slow the transfusion rate and recheck in 15 minutes

Answer: B · Stop the transfusion and keep the vein open with normal saline using new tubing

Stopping the transfusion comes first in any suspected reaction, then maintaining IV access, then notification.

Which IV solution is contraindicated for a client with increased intracranial pressure?
  1. Lactated Ringer's
  2. 3% sodium chloride as ordered
  3. 0.9% sodium chloride
  4. 0.45% sodium chloride

Answer: D · 0.45% sodium chloride

Hypotonic fluids shift water into cells, including brain cells, worsening cerebral edema.

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