Abstract
OBJECTIVESIn patients with pulmonary atresia with intact ventricular septum (PAIVS), biventricular repair is considered to be the optimal treatment option in the absence of significant right ventricular (RV) hypoplasia. However, long-term clinical outcome studies are limited. We evaluated exercise capacity and cardiac function during pharmacological stress in children and young adults with PAIVS after biventricular repair.METHODSTen PAIVS patients after biventricular repair, with a median age of 12 years (range 9-42 years), underwent a cardiopulmonary exercise test, dobutamine stress magnetic resonance imaging (DS-MRI) and delayed contrast enhancement (DCE) MRI.RESULTSThe patients' ages negatively correlated with exercise capacity (r = -0.72, P = 0.01) as well as left (LV) and RV stroke volume (SV) response to pharmacological stress (r = -0.72, P = 0.02; and r = -0.64, P = 0.04; respectively), Furthermore, older age was associated with decreased RV E/A volume ratio and increased pulmonary late diastolic forward flow percentage (r = 0-0.65, P = 0.04, r = 0.66, P = 0.03, respectively). RV E/A volume ratio positively correlated with RV-SV response to DS-MRI (r = 0.77, P = 0.009). and O(2)-pulse during physical stress correlated with biventricular SV response to DS-MRI. No RV or LV ventricular myocardial fibrosis was detected.CONCLUSIONSIn PAIVS patients after biventricular repair exercise capacity and cardiac reserve decrease with age. These findings appear to be related to impaired diastolic RV function and decreased RV filling, indicating that the function of the relatively small RV deteriorates with time
Highlights
In patients with pulmonary atresia with intact ventricular septum (PAIVS) biventricular repair is considered to be the optimal treatment option in the absence of significant right ventricular (RV) hypoplasia
In the present study we evaluated the cardiac response to the physical and pharmacological stress using dobutamine stress magnetic resonance imaging (MRI) in children and young adults with Pulmonary atresia with intact ventricular septum (PAIVS) after biventricular repair
Older age was associated with decreased RV E/A volume ratio and increased pulmonary late diastolic forward flow percentage (r = -0.70, p = 0.02 and r = - 0.80, p = 0.005, respectively) RV E/A volume ratio positively correlated with RV-stroke volume (SV) response to DS-MRI (r = 0.77, p = 0.009)
Summary
Soha Romeih1,2*, Maarten Groenink, Mart N van der Plas, Nico A Blom, Barbara J Mulder, Anje M Spijkerboer. Biventricular surgical repair is considered to be the optimal treatment option as it provides satisfactory results in terms of survival and clinical outcome during the early follow up period. In the present study we evaluated the cardiac response to the physical and pharmacological stress using dobutamine stress MRI in children and young adults with PAIVS after biventricular repair. Ventricular stroke volume (SV) response to pharmacological stress (r = -0.69, p = 0.02; r = -0.73, p = 0.01, respectively- Figure 1). Older age was associated with decreased RV E/A volume ratio and increased pulmonary late diastolic forward flow percentage (r = -0.70, p = 0.02 and r = - 0.80, p = 0.005, respectively) RV E/A volume ratio positively correlated with RV-SV response to DS-MRI (r = 0.77, p = 0.009). VO2max and O2-pulse during physical stress correlated with biventricular SV response to DS-MRI (Figure 2).
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