title: Right ventricle Tei-index: a tool to increase the accuracy of non-invasive detection of pulmonary arterial hypertension in connective tissue diseases.
abstract: OBJECTIVE
  To assess the accuracy of echocardiography for predicting pulmonary arterial hypertension (PAH) in a cohort of patients with systemic sclerosis and other connective tissue diseases, and to evaluate whether addition of the right ventricular (RV) Tei-index contributes to the non-invasive diagnosis of PAH in this patient group.
  
  
  METHODS
  Ninety-eight patients with systemic sclerosis and other connective tissue diseases in whom an echocardiography was performed in the period from January 1st 2004 to July 1st 2005 were included. Echocardiographic systolic pulmonary arterial pressure (PAP), end-diastolic PAP and RV Tei-index were calculated. In cases with a high suspicion of PAH right heart catheterization was performed and systolic, diastolic and mean PAP as well as pulmonary wedge pressure, cardiac output and pulmonary vascular resistance were obtained. These results were compared to the echocardiographic measurements.
  
  
  RESULTS
  The average RV Tei-index of our patients was substantially above normal values. In 35 (36%) patients a right heart catheterization was performed and PAH was confirmed in 28 patients. In 6 of 7 patients without PAH, the RV Tei-index was below the upper limit of normal. A significant correlation was found between the RV Tei-index and the catheterization parameters such as systolic PAP, diastolic PAP and mean PAP.
  
  
  CONCLUSIONS
  The accuracy of echocardiography for the detection of PAH increases when the echocardiographic systolic PAP is combined with an elevated RV Tei-index. As a result, by applying the Tei-index, the number of negative catheterizations can be minimized.
authors.affiliation: Department of Rheumatology, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. m.vonk@reuma.umcn.nl
authors.forename: M C
authors.initials: MC
authors.lastname: Vonk
authors.forename: M H
authors.initials: MH
authors.lastname: Sander
authors.forename: F H J
authors.initials: FH
authors.lastname: van den Hoogen
authors.forename: P L C M
authors.initials: PL
authors.lastname: van Riel
authors.forename: F W A
authors.initials: FW
authors.lastname: Verheugt
authors.forename: A P J
authors.initials: AP
authors.lastname: van Dijk
mesh_terms: D006328:Cardiac Catheterization; D003240:Connective Tissue Diseases / Q000150:complications*; D004452:Echocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011651:Pulmonary Artery; D013599:Systole