Imaging Guidelines for Patients with Atrial Septal Defect Closures

Safety and Feasibility of Advanced Imaging Post-ASD Closure

The American College of Cardiology recommends that patients with atrial septal defect closure devices can safely undergo both high-resolution CT chest scans and MRI for post-closure surveillance and evaluation 1, 2, 3
CT is superior to MRI for evaluating metallic closure devices and is not limited by implanted cardiac devices, according to the American College of Cardiology 1
CT provides excellent visualization of the closure device without significant artifacts that would limit cardiac chamber assessment, as rated "Appropriate" by the American College of Cardiology 1
The American College of Cardiology rates CT as "Appropriate" for assessment of atrial septal anatomy in both preprocedural and postprocedural evaluation 2, 3
Modern low-dose CT protocols can achieve effective doses equal to or lower than 1 mSv for many congenital heart disease indications, as reported by Radiologia Medica 1

The American College of Cardiology recommends using CT for evaluation of device position, integrity, and patency, as it is superior for metallic device assessment 1
CT is recommended for assessment of pulmonary venous anatomy, particularly after sinus venosus ASD or PAPVC repair, according to the American College of Cardiology 3
The American College of Cardiology suggests using MRI for quantification of ventricular volumes and function when serial measurements are needed without radiation exposure 1
MRI is recommended for evaluation of myocardial tissue characteristics and for younger patients where minimizing radiation exposure is paramount, as advised by the American College of Cardiology 1

The American College of Cardiology recommends transthoracic echocardiography (TTE) as the primary modality for routine surveillance at 1 week, 1 month, 3-6 months, 1 year, and every 2-5 years thereafter 3
CT or MRI are reserved for specific indications rather than routine surveillance, according to the American College of Cardiology 3
The American College of Cardiology recommends evaluation for device migration, erosion, or other complications at 3 months to 1 year post-closure and periodically thereafter 4
Significant residual shunt with RV volume overload requiring quantification is an indication for advanced imaging, such as CT or MRI, as recommended by the American College of Cardiology 3

The American College of Cardiology advises not to assume closure devices are MRI contraindications—they are MRI-conditional and imaging can be safely performed 1, 2
CT provides superior device visualization compared to MRI due to less metallic artifact, so choose CT when device integrity is the primary concern, as recommended by the American College of Cardiology 1
For patients requiring serial imaging, balance radiation exposure from CT against diagnostic yield—consider MRI for younger patients needing repeated assessments, as advised by the American College of Cardiology 1
Both modalities require iodinated contrast (CT) or gadolinium-based contrast agents (MRI), so assess renal function and contraindications before ordering, according to the American College of Cardiology 1

The American College of Cardiology recommends performing comprehensive transthoracic echocardiography to evaluate device position and stability, right ventricular size and function, pulmonary artery pressures, presence of pericardial effusion or thrombus on device, and tricuspid regurgitation severity 5, 6, 7, 8
The American College of Cardiology suggests obtaining resting and exercise pulse oximetry to detect right-to-left shunting, particularly if oxygen saturation drops below 90% with activity 9

Transesophageal echocardiography provides superior visualization of the entire atrial septum, device position, defect morphology, atrial rim adequacy, and can identify left atrial appendage thrombus 8, 10
Cardiac MRI is rated "Appropriate" for evaluation when clinical status changes or new concerning symptoms develop after ASD closure, and accurately quantifies shunt magnitude and assesses ventricular volumes without radiation 6, 9, 10

The American Heart Association recommends conservative management with surveillance for small residual shunt (<5mm, no RV volume overload), with annual clinical follow-up with echocardiography 11, 5
Re-intervention (percutaneous or surgical) is indicated for moderate-to-large residual shunt (RV volume overload present) with right atrial and RV enlargement, Qp:Qs ratio >1.5 with symptoms, or progressive functional limitation 8, 11, 12

Annual follow-up is mandatory if atrial arrhythmias develop, RV or LV dysfunction, or ASD repair was performed in adulthood (>40 years) 11, 7
Standard follow-up for uncomplicated cases includes 1 month, 3-6 months, 1 year, and every 2-4 years thereafter if no complications 5, 12

Device erosion is rare but life-threatening, and new chest pain or syncope requires urgent evaluation with immediate echocardiography 11, 5, 7
Pericardial effusions and tamponade may develop up to several weeks after ASD closure, and maintain high clinical suspicion for postpericardiotomy syndrome 11, 5
Assess for device thrombus on all follow-up echocardiograms, and ensure antiplatelet therapy compliance (aspirin 100mg daily minimum for at least 6 months) 8, 5, 12
Atrial arrhythmias occur in 15-25% of adult patients post-closure, particularly those closed after age 40, and new palpitations require 12-lead ECG and consideration of ambulatory monitoring 7