At least 20 mmHg. Of course, an easier and more sensitive way of detection is by blood pressure
measurement. In this regard, an abnormal pulsus paradoxus is defined as an inspiratory drop in systolic
pressure >12 ± 2 mmHg (some authors even quote lower values, such as 6 ± 3).
measurement. In this regard, an abnormal pulsus paradoxus is defined as an inspiratory drop in systolic
pressure >12 ± 2 mmHg (some authors even quote lower values, such as 6 ± 3).