Flattening of the interventricular septum (D-shaped left ventricle) in addition to high right ventricular tracer uptake and increased right ventricular volume found on gated SPECT studies strongly correlates with right ventricular overload

Mohammad Reza Movahed, Absalom Hepner, Paul Lizotte, Norah Milne

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Background. Flattening of the interventricular septum (D-shaped left ventricle) detected during echocardiographic examination is correlated with significant right ventricular (RV) overload. There are no reports of this finding with cardiac gated single photon emission computed tomography (SPECT) imaging. We report an observational study correlating this finding with the presence of RV overload. Methods and Results. Retrospectively, we compared 8 cases with flattening of the interventricular septum on cardiac gated SPECT imaging for which echocardiographic correlations and clinical data were available regarding the presence of RV overload. All patients but 1 had pulmonary hypertension ranging from 42 to 52 mm Hg measured by echocardiographic Doppler studies. All patients but 1 had reasons for RV overload (chronic obstructive pulmonary disease in 3, history of atrial septal defect in 3, pulmonary embolism in 1, and obstructive sleep apnea in 1). Septal flattening present on gated SPECT images was seen in 50% of the cases by echocardiography. Other signs of RV overload (RV enlargement, RV hypertrophy) were observed by echocardiography in 5 patients and by the gated SPECT in 7 patients. Conclusion. The presence of interventricular septal flattening on gated SPECT studies correlates with RV overload and should be routinely assessed during interpretation of gated SPECT studies.

Original languageEnglish (US)
Pages (from-to)428-434
Number of pages7
JournalJournal of Nuclear Cardiology
Volume12
Issue number4
DOIs
StatePublished - Jul 2005

Keywords

  • D-shaped left ventricle
  • Gated single photon emission computed tomography
  • Myocardial perfusion
  • Pulmonary hypertension
  • Right ventricular overload
  • Septal flattening

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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