Pulsus paradoxus is a medical term that describes an abnormality in the heart's rhythm. It is a condition where there is a difference in the blood pressure between the systolic and diastolic readings. There are several synonyms for the term Pulsus paradoxus, including paradoxical pulse, inspiratory decrease in arterial pressure, pathological pulse, and Maigne's sign. These synonyms all refer to variations of the same medical condition. Pulsus paradoxus can be an indication of several medical conditions, including pericardial tamponade, severe asthma, chronic obstructive pulmonary disease, and constrictive pericarditis. It is, therefore, essential to seek medical attention if you experience any of these symptoms.