Pulsus paradoxus; historical and clinical perspectives

Area of Science:

• Cardiology
• Pulmonology
• Medical History

Background:

• Pulsus paradoxus is defined as an exaggerated inspiratory decrease in systolic blood pressure exceeding 10 mm Hg.
• This phenomenon is a significant clinical sign observed in various medical conditions.

Observation:

• The reduction in pulse volume during inspiration was first documented in 1669 by Richard Lower.
• The sign was later described in bronchial asthma by Floyer in 1850.
• Adolf Kussmaul introduced the term "pulsus paradoxus" in 1873, noting it in constrictive pericarditis.

Findings:

• Pulsus paradoxus is a valuable diagnostic indicator.
• Its presence suggests underlying cardiac or respiratory compromise.

Implications:

• Understanding the historical context and clinical significance of pulsus paradoxus aids diagnosis.
• This physical sign remains relevant in identifying critical conditions like cardiac tamponade and severe asthma.