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⚠️ Reduction of Risk · Lesson 6 of 6 · 7 min

Tamponade, Tension Pneumothorax and Autonomic Dysreflexia

🫀 Muffled heart sounds, bulging neck veins and a falling blood pressure. Three findings, one name, and a needle in the pericardium if you call it fast enough. The exam loves triads because they are testable.

💡 Key idea

Beck's triad means tamponade. Tracheal deviation with absent breath sounds means tension pneumothorax. Headache and hypertension in a high spinal injury means dysreflexia: sit up and empty the bladder. Anaphylaxis: epinephrine first.

🧠 Why it matters

CARDIAC TAMPONADE, fluid compressing the heart after chest trauma, cardiac surgery or pericarditis, produces BECK'S TRIAD: hypotension, distended neck veins and muffled heart sounds, often with a narrowing pulse pressure and pulsus paradoxus; treat with emergency pericardiocentesis. TENSION PNEUMOTHORAX, air trapped under pressure in the pleural space, shows as severe respiratory distress, absent breath sounds on one side, tracheal deviation AWAY from the affected side, distended neck veins and hypotension; treat with immediate needle decompression then a chest tube. AUTONOMIC DYSREFLEXIA affects clients with spinal cord injuries at or above T6: a noxious stimulus below the injury, most often a full bladder, then bowel impaction or skin pressure, triggers a sudden severe hypertension with a pounding headache, flushing and sweating above the injury, pallor and goosebumps below, and bradycardia. Sit the client upright immediately, loosen tight clothing, find and remove the cause (check the catheter, bladder, bowel and skin), monitor blood pressure every few minutes and give the ordered antihypertensive if it does not resolve. ANAPHYLAXIS: hives, swelling, wheezing, stridor and hypotension within minutes of a trigger; give intramuscular epinephrine first, then oxygen, fluids and airway support; antihistamines and steroids are adjuncts, not substitutes.

🏥 In the real world

🚽 A client with a C6 injury suddenly has a blood pressure of 210/120, a pounding headache and a flushed face. The nurse sits him upright, checks the urinary catheter and finds it kinked with 800 mL backed up. Straightening the tubing drains the bladder and the pressure falls within minutes. No drug was needed, because the cause was removed. The exam wants that order: position, cause, then medication.

📌 Takeaways

  • Tamponade: hypotension, JVD, muffled heart sounds: pericardiocentesis
  • Tension pneumothorax: tracheal deviation away, absent breath sounds: needle decompression
  • Dysreflexia: sit up, find the stimulus (bladder first), then antihypertensives; anaphylaxis: IM epinephrine

📖 Terms in this lesson

Beck's triad: Hypotension, distended neck veins and muffled heart sounds: the signs of cardiac tamponade.

Tension pneumothorax: Air trapped under pressure in the chest that shifts the trachea away and collapses circulation; needle decompression relieves it.

Autonomic dysreflexia: A sudden dangerous hypertension with headache in spinal cord injuries at T6 or above, usually triggered by a full bladder.

✅ Test yourself

A client with a T4 spinal cord injury develops a severe headache, a blood pressure of 200/110 and sweating above the chest. What is the nurse's first action?
  1. Call the provider before assessing
  2. Lay the client flat and elevate the legs
  3. Sit the client upright and check for a distended bladder
  4. Administer the PRN opioid for the headache

Answer: C · Sit the client upright and check for a distended bladder

Sitting upright lowers blood pressure immediately; a full bladder is the most common trigger of autonomic dysreflexia.

After chest trauma, a client has hypotension, distended neck veins and muffled heart sounds. Which complication should the nurse suspect?
  1. Cardiac tamponade
  2. Hemorrhagic shock
  3. Tension pneumothorax
  4. Pulmonary embolism

Answer: A · Cardiac tamponade

Beck's triad is the classic sign of cardiac tamponade, which requires emergency pericardiocentesis.

A client receiving a new IV antibiotic develops hives, facial swelling and wheezing. Which medication should the nurse administer first?
  1. Diphenhydramine IV
  2. Epinephrine IM
  3. Methylprednisolone IV
  4. Albuterol nebulizer

Answer: B · Epinephrine IM

Intramuscular epinephrine is the first-line treatment for anaphylaxis; antihistamines, steroids and bronchodilators are adjuncts.

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