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Level 1Core Nurse Skills
Diuretic and Electrolyte Monitoring Basics
Support patients on diuretics — daily weights, volume and electrolyte safety, and what to escalate.
Beginner~14 min
Learning Objectives
- 1.Explain why diuretic patients need weight and electrolyte monitoring.
- 2.Recognize signs of over- and under-diuresis.
- 3.Escalate electrolyte and volume problems appropriately.
Purpose
Diuretics remove fluid in heart failure and volume overload, but they shift potassium and can over- or under-dry a patient. Monitoring weights and electrolytes keeps them safe.
What to ask & measure
- •Daily morning weight trend (same scale, after voiding).
- •Swelling, shortness of breath, orthopnea — better or worse?
- •Lightheadedness, cramps, palpitations (electrolyte/volume clues)?
- •Are they taking the diuretic and any potassium as prescribed?
- •Urine output change.
Over- vs under-diuresis
- •Too much: lightheadedness, low BP, rising creatinine, cramps, rapid weight loss.
- •Too little: rising weight, worse swelling/SOB, orthopnea.
What meds/labs matter
- •Loop diuretics (furosemide, torsemide, bumetanide) lower potassium.
- •Potassium-sparing agents/MRAs (spironolactone) and ACE/ARB raise potassium.
- •Monitor BMP: potassium, sodium, creatinine.
Red flags
- •Weight up >3 lb in 2 days or >5 lb in a week (decompensation).
- •Symptomatic low BP / near-syncope from over-diuresis.
- •Potassium critically high or low; palpitations with cramps.
Escalate
Rapid weight gain with worsening dyspnea, symptomatic hypotension, or a critical potassium goes to the provider promptly.
What to document & send the provider
- •Weight trend and symptom change.
- •BP/HR, recent BMP/potassium.
- •Diuretic dose and adherence.
Patient education script
- •"Weigh yourself every morning, same scale, after you pee, and write it down."
- •"Call us if you gain more than 3 pounds in 2 days or your breathing gets worse."
Mini case
A heart failure patient on furosemide is up 5 lb in 4 days with more ankle swelling and orthopnea.
What now?
Show answer
This is early decompensation (under-diuresis / fluid retention). Route urgently to the provider with the weight trend and symptoms — diuretic adjustment and labs are likely needed. It shouldn’t wait for a routine appointment.
Checklist
- Reviewed weight trend and volume symptoms.
- Checked for over-diuresis (low BP, cramps).
- Noted recent potassium/creatinine.
- Escalated rapid weight gain or symptomatic changes.
Knowledge Check Quiz
Disclaimer: This content is for educational purposes only. It is not medical advice, does not replace clinical judgment, and is not a substitute for institutional protocols or certified medical interpreters. No patient health information (PHI) should be entered into this application.