Pulsus paradoxus (PP), also paradoxic pulse or paradoxical pulse, is an abnormally large decrease in systolic blood pressure and pulse wave amplitude during inspiration. The normal fall in pressure is less than 10 mm Hg. When the drop is more than 10 mm Hg, it is referred to as pulsus paradoxus. | Jewels of Clinical Medicine

Pulsus Paradoxus- Correct technique of measurement

Pulsus paradoxus | Anales de Pediatría