22/05/2026
⚠️ Hyperkalemia
The Electrolyte Emergency That Can Stop the Heart Within Minutes
Hyperkalemia is a potentially life-threatening electrolyte disturbance that can rapidly lead to fatal cardiac arrhythmias and sudden cardiac arrest if not recognized early.
━━━━━━━━━━━━━━━
📌 Definition
🔹 Hyperkalemia:
Potassium level > 5.5 mEq/L
🔹 Severe Hyperkalemia:
Potassium ≥ 6.5 mEq/L or ECG changes present
�
━━━━━━━━━━━━━━━
🔍 Common Causes
① Renal Failure
🩺 The most common cause due to impaired potassium excretion.
② Medications
💊 Common drugs include:
ACE inhibitors
ARBs
Spironolactone
NSAIDs
③ Metabolic Acidosis
⚡ Hydrogen ions move into cells while potassium shifts out.
④ Tissue Breakdown
🔥 Seen in:
Rhabdomyolysis
Burns
Crush injuries
Tumor lysis syndrome
⑤ Excess Potassium Intake
🥗 Especially dangerous in patients with chronic kidney disease.
━━━━━━━━━━━━━━━
🚨 Clinical Features
🧍 Symptoms
Muscle weakness
Fatigue
Palpitations
Paresthesia
❤️ Severe Manifestations
Flaccid paralysis
Ventricular arrhythmias
Sudden cardiac arrest
━━━━━━━━━━━━━━━
📈 ECG Changes in Hyperkalemia
🟢 Early Changes
Tall peaked T waves
🟡 Progressive Changes
PR prolongation
Flattened or absent P waves
Widened QRS complex
🔴 Life-Threatening Changes
Sine wave pattern
Ventricular fibrillation
Asystole
━━━━━━━━━━━━━━━
🚑 Emergency Management
① Stabilize the Cardiac Membrane
💉 IV Calcium Gluconate
② Shift Potassium Into Cells
💊
Insulin + Dextrose
Nebulized Salbutamol
Sodium bicarbonate (if acidosis present)
③ Remove Potassium From the Body
🩺
Loop diuretics
Potassium binders
Hemodialysis
━━━━━━━━━━━━━━━
💡 High-Yield Clinical Pearl
“Treat the ECG, not just the potassium level.”
Even moderately elevated potassium can produce dangerous ECG changes requiring immediate intervention.
━━━━━━━━━━━━━━━
⚠️ Hyperkalemia is a silent but deadly emergency.
🫀 Early recognition of ECG changes can save a life.