2009
DOI: 10.1007/s00247-009-1304-8
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MDCT evaluation of pulmonary embolism in children and young adults following a lateral tunnel Fontan procedure: optimizing contrast-enhancement techniques

Abstract: This series demonstrates that suboptimal contrast enhancement can result in misdiagnosis or incomplete evaluation of PE in children and young adults following a lateral Fontan procedure. Careful attention to optimizing contrast enhancement during MDCT examination for evaluation of PE in these patients is essential to prevent misdiagnosis and incomplete evaluation.

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Cited by 51 publications
(29 citation statements)
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“…Because there is no subpulmonary mixing chamber in the Fontan to homogenize contrast, CT pulmonary angiograms with a standard protocol have significant swirling artifact, heterogeneous contrast enhancement, and a high rate of false-positive results. 233 Nuclear lung perfusion scans are similarly unreliable because of asymmetric pulmonary blood flow patterns. Multidetector CT angiography with simultaneous upper and lower extremity contrast power injection with early-and late-phase image acquisition can improve diagnostic accuracy.…”
Section: Pathogenesismentioning
confidence: 99%
“…Because there is no subpulmonary mixing chamber in the Fontan to homogenize contrast, CT pulmonary angiograms with a standard protocol have significant swirling artifact, heterogeneous contrast enhancement, and a high rate of false-positive results. 233 Nuclear lung perfusion scans are similarly unreliable because of asymmetric pulmonary blood flow patterns. Multidetector CT angiography with simultaneous upper and lower extremity contrast power injection with early-and late-phase image acquisition can improve diagnostic accuracy.…”
Section: Pathogenesismentioning
confidence: 99%
“…Such flow anomalies have been reported to mimic pulmonary emboli in the setting of single cardiac ventricle, 9 Fontan procedure 10 and iatrogenic pulmonary vein stenosis post-cardiac radiofrequency ablation. 11 The complicated imaging appearance and concerning clinical findings of this episode took almost 18 months to be resolved, but concluded a course of missed diagnosis and incorrect management lasting many years.…”
Section: Accepted M Manuscriptmentioning
confidence: 98%
“…11 The complicated imaging appearance and concerning clinical findings of this episode took almost 18 months to be resolved, but concluded a course of missed diagnosis and incorrect management lasting many years. Asymmetric PA opacification has various unusual and potentially confusing causes (Table 1) 9,10,11,12,13,14,15,16 . The asymmetric PA flow artifact was repeatedly misinterpreted by many experienced radiologists and clinicians.…”
Section: Accepted M Manuscriptmentioning
confidence: 99%
“…In patients with impaired left ventricular function, for a fixed volume and flow rate of contrast, there is a delay in peak enhancement and lower attenuation than patients with normal left ventricular function (11). The cardiac output of patients with Fontan circuits is often impaired and consequently a test bolus or bolus tracking can help understand patient specific haemodynamics (see below).…”
Section: Patient Factors: Weight and Cardiac Outputmentioning
confidence: 99%
“…If a standard CT pulmonary angiographic protocol is performed in this patient group, it is almost certainly going to be either non-diagnostic or demonstrate a pseudoembolism or pseudothrombus (11). With an arm injection, contrast will usually flow preferentially into the RPA, very little in the left pulmonary artery and unopacified blood will be entering from below via the IVC or right atrial connection to the central pulmonary circulation (Figures 9,10).…”
Section: Pulmonary Embolism and Thrombus In The Fontan Circuitmentioning
confidence: 99%