Magnetic resonance imaging analysis of right ventricular pressure-volume loops: In vivo validation and clinical application in patients with pulmonary hypertension

Titus Kuehne, Sevim Yilmaz, Paul Steendijk, Phillip Moore, Maarten Groenink, Maythem Saaed, Oliver Weber, Charles B. Higgins, Peter Ewert, Eckard Fleck, Eike Nagel, Ingram Schulze-Neick, Peter Lange

Research output: Contribution to journalArticlepeer-review

296 Scopus citations

Abstract

Background - The aims of this study were to validate MRI-derived right ventricular (RV) pressure-volume loops for assessment of RV myocardial contractility and then to apply this technique in patients with chronic RV pressure overload for assessment of myocardial contractility, ventricular pump function, and VA coupling. Methods and Results - Flow-directed catheters were guided under MR fluoroscopy (1.5 T) into the RV for invasive pressure measurements. Simultaneously, ventricular volumes and myocardial mass were assessed from cine MRI. From sampled data, RV pressure-volume loops were constructed, and maximal ventricular elastance indexed to myocardial mass (E max_i) was derived by use of a single-beat estimation method. This MRI method was first validated in vivo (6 swine), with conductance techniques used as reference. Bland-Altman test showed good agreement between methods (E max_i=5.1±0.5 versus 5.8±0.7 mm Hg · mL -1 · 100 g -1, respectively; P=0.08). Subsequently, the MRI method was applied in 12 subjects: 6 control subjects and 6 patients with chronic RV pressure overload from pulmonary hypertension. In these patients, indexes of RV pump function (cardiac index), E max_i, and VA coupling (E max/E a) were assessed. In patients with pulmonary hypertension, RV pump function was decreased (cardiac index, 2.2±0.5 versus 2.9±0.4 L · min -1 · m -2; P<0.01), myocardial contractility was enhanced (E max_i, 9.2±1.1 versus 5.0±0.9 mm Hg · mL -1 · 100 g -1; P<0.01), and VA coupling was inefficient (E max/E a, 1.1±0.3 versus 1.9±0.4; P<0.01) compared with control subjects. Conclusions - RV myocardial contractility can be determined from MRI-derived pressure-volume loops. Chronic RV pressure overload was associated with reduced RV pump function despite enhanced RV myocardial contractility. The proposed MRI approach is a promising tool to assess RV contractility in the clinical setting.

Original languageEnglish
Pages (from-to)2010-2016
Number of pages7
JournalCirculation
Volume110
Issue number14
DOIs
StatePublished - 5 Oct 2004
Externally publishedYes

Keywords

  • Heart defects, congenital
  • Hypertension, pulmonary
  • Magnetic resonance imaging
  • Myocardial contraction
  • Ventricles

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