Which condition is a pericardial tamponade in the Hs & Ts framework?

• A. Tamponade (cardiac)
• B. Tension pneumothorax
• C. Hypoxia
• D. Hypothermia

Answer: (A)

Tamponade (cardiac) is the correct choice. In the Hs & Ts framework, the “T” group includes conditions that obstruct the heart or its filling. Pericardial tamponade happens when fluid accumulates in the pericardial sac, raising the pressure around the heart so it can’t fill properly during diastole. That limits venous return (low preload), reduces stroke volume, and drops cardiac output, causing shock. It’s a classic obstructive cause that needs relief of the pressure if possible (pericardiocentesis or surgical intervention) along with supportive care.

Tension pneumothorax is another obstructive cause but acts through air in the pleural space causing lung collapse and mediastinal shift. Hypoxia and hypothermia are separate Hs causes—issues with oxygenation or temperature—not mechanical obstruction of filling.