HYPERKALEMIA: Causes, ECG Changes & Clinical Features

Hyperkalemia Part 1: Causes, ECG Changes & Clinical Features — a complete clinical guide covering everything from potassium homeostasis to cardiac arrest risk. In this video you will learn: ✅ Definition & severity classification (mild / moderate / severe) ✅ Potassium homeostasis — how the body maintains the balance ✅ Transcellular gradient mechanisms (insulin, catecholamines, acid-base) ✅ Pathophysiology — resting membrane potential explained ✅ Causes: excessive intake, reduced renal excretion & transcellular shift ✅ Pseudohyperkalemia — when to suspect it and how to confirm ✅ Clinical presentation — neuromuscular, cardiac & GI features ✅ ECG changes by potassium level — from peaked T waves to sine wave pattern Whether you are a medical student, junior doctor, or preparing for MRCP, USMLE, or OSCE exams — this video gives you examiner-level insight into one of the most dangerous electrolyte emergencies in clinical medicine. ⏱️ CHAPTERS 0:00:00 Hook — why hyperkalemia kills quietly 0:01:10 Epidemiology & why it matters 0:02:00 Definition & severity classification 0:03:45 Potassium homeostasis 0:05:55 Transcellular gradient mechanisms 0:08:00 Pathophysiology — resting membrane potential 0:10:00 System implications (cardiac, neuromuscular, renal) 0:11:30 Causes — excessive intake 0:12:05 Causes — reduced renal excretion 0:14:20 Causes — transcellular shift 0:15:50 Pseudohyperkalemia 0:16:40 Clinical presentation 0:19:05 VBG & ECG in hyperkalemia 0:19:50 Flowchart summary — neuromuscular features 0:21:35 Cardiac manifestations by potassium level 🎓 About ClinicalMedEd: ClinicalMedEd by Dr. Raza Ali Akbar - Senior Consultant IM (HMC Qatar), Clinical Assoc Prof (Qatar Univ), Asst Prof (Weill Cornell Med-Qatar), current MRCP UK PACES Examiner, former MRCP UK Question Author, FRCP Edin. Think. Learn. Heal. ━━━━━━━━━━━━━━━━━━━━ 📌 CORRECTION (22:50) At 22:50 I describe the conduction defect descending the cardiac conduction system as "higher degree of block." Strictly, "degree of block" (1°/2°/3°) refers to AV conduction failure severity, not anatomical level. The correct framing: as hyperkalemia depresses conduction below the AV node (His → bundle branches → Purkinje), the escape pacemaker becomes slower and less reliable — conferring higher clinical risk. Full clarification pinned in the comments. Clinical principle stands: lower in the system = higher risk. ━━━━━━━━━━━━━━━━━━━━ Disclaimer: Visuals: All images, graphics, audio and video assets are licensed stock media provided via Canva, unless otherwise attributed. Inforgfraphics/images: Some content created specifically for Clinicalmeded. Medical: This content is strictly for educational and informational purposes. It does not constitute medical advice or establish a doctor-patient relationship. Practice: Medical knowledge evolves constantly. Always adhere to your local institutional guidelines and clinical protocols when treating patients. Video Part 2: Hyperkalemia Part 2 - Investigations & Management Algorithm - now published (23rd May 2026)] [   • Hyperkalemia Management: Stabilise, Shift ...  ] #hyperkalemia #highpotassium #ECGchanges #cardiology #electrolytes #potassium #medicalstudent #MRCP #USMLE #OSCE #clinicalmedicine #acutemedicine #internalmedicine #renalmedicine #ClinicalMedEd