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Right-to-Left Shunt
Fathima Fijula P. Manzil, MD; Christopher R. McAdams, MD; Hollins Clark, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Diagnostic Checklist

          • Scanning Tips

            TERMINOLOGY

            • Definitions

              • Right-to-left shunt: Abnormal communication between right and left heart or between systemic and pulmonary vessels, bypassing pulmonary capillary circulation
                • Can allow venous to arterial emboli, causing ischemia to multiple organs (e.g., brain, bowel)

            IMAGING

            • General Features

              • Nuclear Medicine Findings

                • Protocol Advice

                  DIFFERENTIAL DIAGNOSIS

                    DIAGNOSTIC CHECKLIST

                    • Image Interpretation Pearls

                      • Reporting Tips

                        Selected References

                        1. Asabella AN et al: Lung perfusion imaging in tetralogy of Fallot: A case report. Mol Imaging Radionucl Ther. 27(3):146-8, 2018
                        2. Ito K et al: Cut-off value for normal versus abnormal right-to-left shunt percentages using (99m)Tc-macroaggregated albumin. Nucl Med Commun. 32(10):936-40, 2011
                        3. MacDonald A et al: Infrequently performed studies in nuclear medicine: Part 1. J Nucl Med Technol. 36(3):132-43; quiz 145, 2008
                        4. Society of Nuclear Medicine and Molecular Imaging. SNMMI Procedure Standard for Lung Scintigraphy 4.0. http://snmmi.files.cms-plus.com/docs/Lung_Scintigraphy_V4_Final.pdf. Created July 19, 2011. Accessed June 06, 2019
                        5. Martinez-Jimenez S et al: Nonsurgical extracardiac vascular shunts in the thorax: clinical and imaging characteristics. Radiographics. 30(5):e41, 2010
                        Related Anatomy
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                        Related Differential Diagnoses
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                        References
                        Tables

                        Tables

                        KEY FACTS

                        • Terminology

                          • Imaging

                            • Top Differential Diagnoses

                              • Diagnostic Checklist

                                • Scanning Tips

                                  TERMINOLOGY

                                  • Definitions

                                    • Right-to-left shunt: Abnormal communication between right and left heart or between systemic and pulmonary vessels, bypassing pulmonary capillary circulation
                                      • Can allow venous to arterial emboli, causing ischemia to multiple organs (e.g., brain, bowel)

                                  IMAGING

                                  • General Features

                                    • Nuclear Medicine Findings

                                      • Protocol Advice

                                        DIFFERENTIAL DIAGNOSIS

                                          DIAGNOSTIC CHECKLIST

                                          • Image Interpretation Pearls

                                            • Reporting Tips

                                              Selected References

                                              1. Asabella AN et al: Lung perfusion imaging in tetralogy of Fallot: A case report. Mol Imaging Radionucl Ther. 27(3):146-8, 2018
                                              2. Ito K et al: Cut-off value for normal versus abnormal right-to-left shunt percentages using (99m)Tc-macroaggregated albumin. Nucl Med Commun. 32(10):936-40, 2011
                                              3. MacDonald A et al: Infrequently performed studies in nuclear medicine: Part 1. J Nucl Med Technol. 36(3):132-43; quiz 145, 2008
                                              4. Society of Nuclear Medicine and Molecular Imaging. SNMMI Procedure Standard for Lung Scintigraphy 4.0. http://snmmi.files.cms-plus.com/docs/Lung_Scintigraphy_V4_Final.pdf. Created July 19, 2011. Accessed June 06, 2019
                                              5. Martinez-Jimenez S et al: Nonsurgical extracardiac vascular shunts in the thorax: clinical and imaging characteristics. Radiographics. 30(5):e41, 2010