Doppler echocardiographic evaluation of pulmonary regurgitation facilitates the diagnosis of constrictive pericarditis.

Diagnosing constrictive pericarditis (CP) remains a clinical challenge. Ventricular interdependence and dissociation of intrathoracic and intracardiac pressures are hallmark features that are readily recognized by invasive and noninvasive hemodynamics. The Doppler echocardiographic signal from pulmonic valve regurgitation depends on the relationship between pulmonary artery (intrathoracic) and right ventricular (intracardiac) pressure. Respiration-associated changes in this signal may aid in the evaluation of pericardial constriction. We demonstrate here that early diastolic cessation with inspiration can indicate a CP process. Early diastolic cessation with inspiration was shown to have correctly diagnosed CP in 70% of the patients in this study, with a sensitivity of 77%, specificity of 64%, positive predictive value of 67%, and negative predictive value of 75%. This noninvasive insight into dissociation of intracardiac and intrathoracic pressures, although not sufficient on its own, may be a valuable tool for aiding in the diagnosis of CP.