congenital heart surgery
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About congenital heart surgery
Sources and Guidelines Referenced
The clinical standards and evidence base in this guide are derived from major international cardiothoracic and cardiology guidelines, including: standard practice guidelines from the American College of Cardiology and American Heart Association (AHA/ACC Guidelines for Adults with Congenital Heart Disease, Stout et al., 2019); European Society of Cardiology Guidelines for Management of Adult Congenital Heart Disease (Baumgartner et al., 2021); Society of Thoracic Surgeons Congenital Heart Surgery Database Reports (Jacobs et al., 2021); National Institute for Health and Care Excellence Guidelines (NICE IPG555); and published multicenter trials from the Congenital Heart Surgeons Society (CHSS).
congenital heart surgery: A Comprehensive Patient Guide
1. Definition and Medical Identity
Congenital heart surgery is a specialized branch of cardiothoracic surgery that repairs structural heart defects present at birth. Known clinically as congenital heart disease repair, these procedures restore normal cardiac blood flow, repair damaged valves, and close abnormal heart openings. The primary goal is establishing functional blood circulation and protecting long-term heart and lung health.
Congenital heart defects occur during embryonic development when the fetal heart structures fail to form correctly. Operations are performed on neonates, infants, children, adolescents, and adults with congenital cardiac conditions. Depending on the pathology, procedures are classified as anatomical repairs (permanently restoring normal anatomy) or palliative operations (improving blood flow and organ stability when single-stage repair is not feasible).
2. The Underlying Condition or Need
Congenital heart defects arise during embryonic development when the fetal heart chambers, valves, or major blood vessels fail to form correctly. These structural malformations alter normal circulatory flow, forcing the heart to work harder or sending deoxygenated blood into the body. Without treatment, severe structural defects can lead to heart failure, growth delays, and permanent lung vessel damage.
structural cardiac malformations typically present through two main physiological mechanisms: acyanotic lesions and cyanotic lesions. Acyanotic defects, such as a ventricular septal defect (VSD) or patent ductus arteriosus (PDA), involve left-to-right blood shunting, which overloads pulmonary circulation and leads to heart failure. Cyanotic defects, such as tetralogy of Fallot or transposition of the great arteries (TGA), cause right-to-left shunting, resulting in oxygen-depleted blood circulating through systemic arteries. Left untreated, high pulmonary blood flow leads to Eisenmenger syndrome, an irreversible state of severe pulmonary hypertension that renders surgical repair impossible (Baumgartner et al., 2021).
3. How the Treatment Works — Mechanism
Congenital heart surgery works by physically restructuring abnormal heart tissue, closing abnormal cardiac openings, and rerouting blood vessels to establish normal circulatory pathways. Surgeons use synthetic patches, donor tissue, or mechanical devices to rebuild heart structures. Most procedures utilize a cardiopulmonary bypass (heart-lung machine) to divert blood away from the heart, allowing surgeons to operate on a still, bloodless heart.
During cardiopulmonary bypass, systemic circulation is maintained by an external pump and oxygenator. To protect myocardial tissue, cold chemical solutions containing potassium, known as cardioplegia, are infused into the coronary arteries to temporarily arrest heart motion. Surgeons then operate directly inside cardiac chambers using precision techniques under surgical loupe magnification. Defects are repaired using bovine pericardial patches, polytetrafluoroethylene (PTFE) grafts, or native tissue flaps. Obstructed valves are widened through valvotomy, and abnormal vessel alignments are anatomically switched or bypassed. Once repair is achieved, the heart is re-warmed, cardiac contraction resumes, and cardiopulmonary bypass is safely discontinued.
4. Types and Variations
Congenital heart operations are categorized by defect complexity, patient age, and surgical objective. Interventions range from definitive primary repairs, which permanently correct the defect in a single operation, to staged palliative procedures designed to support blood flow in complex single-ventricle anatomy. Surgical approaches include traditional open-chest operations, minimally invasive thoracotomies, and hybrid transcatheter surgical procedures.
In single-ventricle lesions, such as hypoplastic left heart syndrome (HLHS), patients require a three-stage palliative surgical pathway: the Norwood procedure in the first week of life, the bidirectional Glenn procedure at 3 to 6 months, and the Fontan procedure at 2 to 4 years of age (Stout et al., 2019). The table below outlines common variations in congenital heart surgery.
| Defect Category | Representative Procedure | Surgical Approach | Standard Timing | Primary Objective |
|---|---|---|---|---|
| Simple Acyanotic Shunt | ASD / VSD Closure | Open-chest (CPB) or Minimally Invasive | 3 to 12 months (or adult diagnosis) | Close septal hole, eliminate left-to-right shunt |
| Cyanotic Tetralogy Lesion | Tetralogy of Fallot Repair | Open-chest on Cardiopulmonary Bypass | 3 to 6 months of age | Patch VSD, relieve right ventricular outflow tract obstruction |
| Great Vessel Transposition | Arterial Switch Operation | Open-chest on Cardiopulmonary Bypass | First 1 to 2 weeks of life | Transpose aorta and pulmonary artery, re-implant coronary arteries |
| Single Ventricle Complex | Fontan Staged Palliative Series | Multi-stage Open Operations | Neonatal to 4 years (staged) | Direct passive venous return directly to pulmonary arteries |
| Coarctation / Obstructive | Aortic Coarctation Repair | Left Thoracotomy (off-bypass or CPB) | Neonatal to early childhood | Resect narrowed aortic segment and re-connect vessel |
5. Who the Treatment Is For — Indications
Congenital heart surgery is indicated for infants, children, and adults diagnosed with structural cardiac malformations that impair oxygen delivery or cardiac function. Indications include symptomatic heart failure, significant blood shunting between heart chambers, severe heart valve narrowing or leakage, and blue-tinted skin caused by low oxygen saturation, known as cyanosis. Prompt surgical correction prevents progressive heart tissue damage.
Standard clinical guidelines from the American Heart Association and European Society of Cardiology establish clear intervention thresholds (Stout et al., 2019; Baumgartner et al., 2021):
- Hemodynamically significant left-to-right shunts resulting in pulmonary-to-systemic blood flow ratios (Qp:Qs) exceeding 1.5:1.
- Critical cyanotic lesions requiring urgent neonatal intervention to maintain systemic or pulmonary circulation.
- Severe valvular stenosis or regurgitation causing progressive ventricular enlargement or strain.
- Aortic coarctation with peak pressure gradients exceeding 20 mmHg across the narrowed segment.
- Adults with previously repaired congenital defects exhibiting progressive ventricular dysfunction or arrhythmias.
6. Who the Treatment Is NOT For — Contraindications
Congenital heart surgery is contraindicated when secondary medical conditions significantly outweigh potential surgical benefits or make survival unlikely. Absolute contraindications include irreversible severe pulmonary vascular obstructive disease (permanent high blood pressure in lung arteries with reversed blood shunting), active systemic sepsis, and severe irreversible non-cardiac organ failure or fatal genetic conditions. Relative contraindications require stabilization prior to surgery.
Contraindications and high-risk factors are evaluated using standardized multidisciplinary protocols:
- Absolute: Eisenmenger syndrome with fixed pulmonary vascular resistance exceeding 8 Wood units per square meter unresponsive to pulmonary vasodilators.
- Absolute: Active, uncontrolled systemic sepsis or bacterial endocarditis involving destruction of essential structural anchoring tissues.
- Relative: Severe acute lung injury, active pneumonia, or systemic viral infection (surgery is postponed until infection resolves).
- Relative: Severe multi-organ dysfunction, including acute renal failure or severe hepatic dysfunction, requiring stabilization prior to elective surgery.
- Relative: Severe intracranial hemorrhage in premature infants (delaying surgery until neurological stabilization occurs).
7. Alternatives and Clinical Comparison
Alternatives to open congenital heart surgery include catheter-based interventional therapies, conservative medical management, and heart transplantation. Transcatheter structural procedures utilize thin tubes inserted through blood vessels to place closure devices or expand narrowed valves without open-chest surgery. While medical therapy helps control heart failure symptoms, it cannot correct structural anatomical defects, making surgery or catheterization necessary for definitive repair.
Transcatheter interventions have become the standard of care for specific simple defects, such as secundum atrial septal defects and isolated patent ductus arteriosus (NICE IPG555). However, open surgery remains necessary for complex anatomy, multiple cardiac defects, and neonates with small blood vessels. Medical therapy using beta-blockers, ACE inhibitors, and diuretics serves as a bridge to surgery rather than a curative alternative.
| Treatment Method | Mechanism of Action | Invasiveness | Primary Indications | Clinical Trade-offs |
|---|---|---|---|---|
| Congenital Heart Surgery | Direct anatomical resection, patch repair, or structural reconstruction | High (Median sternotomy or thoracotomy) | Complex defects, multi-lesion anomalies, neonatal anatomical switches | Definitive repair; requires bypass, recovery time, sternal healing |
| Transcatheter Intervention | Percutaneous deployment of closing devices, stents, or balloon valves | Low (Femoral artery/vein access) | Secundum ASD, simple PDA, balloon valvuloplasty, coarctation stents | Minimal recovery; restricted by blood vessel size and defect shape |
| Medical Management | Pharmacological symptom control (ACE inhibitors, diuretics, inotropes) | Non-invasive (Oral or intravenous drugs) | Temporary bridging, mild non-hemodynamic defects, palliated end-stage care | Controls symptoms; does not repair underlying structural defect |
| Heart Transplantation | Complete cardiac replacement with donor organ | High (Sternotomy with complete heart replacement) | End-stage single ventricle failure, unrepairable complex malformations | Definitive for organ failure; limited donor supply, lifelong immunosuppression |
8. Pre-Treatment Phase
The pre-treatment phase for congenital heart surgery involves intensive diagnostic mapping, clinical stabilization, and multidisciplinary planning. Patients undergo detailed anatomical imaging through echocardiography, advanced cross-sectional imaging, and laboratory blood evaluations. Preoperative preparation includes optimizing nutritional status, managing active heart failure symptoms with medications, adjusting baseline drugs, and educating families regarding the intensive care unit recovery process and post-surgical care protocols.
The diagnostic workup relies on high-resolution transthoracic echocardiography (TTE) and, in older children or adults, transesophageal echocardiography (TEE). Cardiac computed tomography (CT) or magnetic resonance imaging (MRI) creates precise three-dimensional models of abnormal vessels. In select cases, diagnostic cardiac catheterization measures pulmonary vascular resistance and intracardiac pressures. Blood work includes complete blood counts, coagulation screens, liver and kidney profiles, and blood type crossmatching for potential transfusions. Pediatric patients receive targeted nutritional supplementation to achieve adequate weight gain before elective surgery.
9. The Procedure — Step-by-Step Clinical Detail
Congenital heart surgery follows a precise, sequential surgical protocol conducted under continuous general anesthesia and specialized cardiac monitoring. The surgical team accesses the heart via a central chest incision, connects the patient to a heart-lung machine, and temporarily stops the heartbeat using a cold protective fluid called cardioplegia. The surgeon meticulously repairs internal defects before safely restarting the heart and restoring independent circulation.
The surgical workflow proceeds through defined steps:
- Anesthesia & Line Placement: General anesthesia is administered. Continuous monitoring lines are placed, including an arterial line for blood pressure measurement, a central venous catheter, and a transesophageal echocardiography probe.
- Surgical Access: A median sternotomy (vertical dividing of the chest bone) or lateral thoracotomy is performed to expose the pericardial sac and cardiac structures.
- Cannulation & Cardiopulmonary Bypass: Cannulas (plastic tubes) are inserted into the vena cavae and the ascending aorta, connecting the patient to the heart-lung machine to maintain systemic perfusion.
- Hypothermia & Myocardial Protection: Systemic body temperature is cooled (mild to deep hypothermia). The aorta is cross-clamped, and cold cardioplegic solution is infused to stop heart contractions safely.
- Anatomical Repair: The cardiac chambers or major vessels are opened. The surgeon repairs internal structures using pericardial patches, synthetic grafts, valve reshaping, or vessel transposition.
- De-airing & Re-warming: Cardiac chambers are carefully filled with blood to purge trapped air. Body temperature is restored to 37°C while unclamping the aorta to restore coronary circulation.
- Weaning from Bypass: The heart resumes regular beating (spontaneously or via temporary electrical pacing wires). Cardiopulmonary bypass is gradually reduced and discontinued as the heart takes over circulation.
- Hemostasis & Closure: Chest drainage tubes are placed to monitor bleeding. Stainless steel sternal wires secure the chest bone, and surgical incisions are closed in layered surgical fashion.
10. Immediate Post-Procedure Period
The immediate post-procedure period begins with patient transfer to a specialized pediatric or cardiac intensive care unit for continuous monitoring. During the first 24 to 48 hours, care focuses on maintaining stable blood pressure, weaning off mechanical breathing support, managing postoperative pain, and monitoring fluid drainage from chest tubes. Gradual stabilization allows patients to transition from intravenous medications to oral therapies.
Intensive monitoring tracks hemodynamic stability, heart rhythm, central venous pressure, and urine output. Intravenous inotropic medications (such as milrinone or epinephrine) support heart contraction strength as the heart recovers from surgical arrest. Mechanical ventilation is continued until the patient demonstrates adequate respiratory muscle strength, normal blood gas levels, and stability without severe bleeding. Chest tube drainage is recorded hourly to detect postoperative hemorrhage. Continuous electrocardiographic monitoring detects temporary arrhythmias, which are treated with temporary pacing wires or antiarrhythmic medications.
11. Recovery — Short and Long Term
Recovery from congenital heart surgery occurs across short-term inpatient healing and long-term outpatient rehabilitation phases. Inpatient hospital recovery usually spans one to two weeks, during which physical mobility is gradually restored. Complete sternal bone healing requires six to eight weeks, during which physical lifting is restricted. Long-term cardiac recovery involves ongoing cardiology evaluations to track heart function and developmental progression.
The recovery timeline follows structured milestones:
- Days 1 to 3: Transition from ICU to step-down ward; removal of endotracheal tube, chest drains, and central monitoring lines; initiation of oral feeding and gentle sitting.
- Days 4 to 7: Progression to unassisted walking (or active infant play); transition from intravenous to oral medications; routine discharge echocardiogram to verify repair integrity.
- Weeks 2 to 6: Home-based recovery; strict sternal precautions (no lifting objects over 5–10 pounds, no pulling on arms); gradual return to school or light daily activities.
- Months 2 to 3: Sternal union complete; full clearance for non-contact physical activities and pediatric immunizations.
- Lifelong Follow-up: Annual or bi-annual specialized adult or pediatric congenital cardiology evaluations, including periodic echocardiography, Holter monitoring, and exercise testing (Stout et al., 2019).
12. Risks, Side Effects, and Complications
Congenital heart surgery carries inherently stratified risks that depend on defect severity, patient age, and baseline physical health. While simple structural repairs have low complication rates, complex newborn reconstructions involve higher risk profiles. Potential side effects range from transient wound discomfort and fluid accumulation to major complications such as heart rhythm disturbances, post-surgical bleeding, respiratory infections, and stroke.
According to the Society of Thoracic Surgeons Congenital Heart Surgery Database, overall survival for congenital cardiac operations exceeds 96%, with low risk in simple ASD/VSD repairs (<1% mortality) and higher risk in complex single-ventricle reconstructions (Jacobs et al., 2021). The table below outlines complication risk categories.
| Severity Level | Potential Complication | Observed Rate / Context | Clinical Management Strategy |
|---|---|---|---|
| Common / Mild | Postoperative incisional pain Transient fever / pericardial rub Mild pleural or pericardial effusion | 15% to 30% of surgical cases | Oral analgesics, non-steroidal anti-inflammatory drugs, short diuretic courses |
| Uncommon / Moderate | Surgical site superficial infection Postoperative atrial / junctional tachyarrhythmias Delayed sternal healing / drain prolonged | 5% to 10% of surgical cases | Targeted intravenous antibiotics, antiarrhythmic drugs, temporary cardiac pacing |
| Rare / Serious | Complete heart block requiring permanent pacemaker Severe postoperative hemorrhage requiring reoperation Low cardiac output syndrome (LCOS) Acute renal failure / neurological injury | 1% to 5% overall (higher in complex neonates) | Permanent pacemaker implantation, surgical re-exploration, ECMO support, hemodialysis |
13. Lifestyle and Behavioural Considerations
Lifestyle and behavioral considerations play an essential role in optimizing surgical outcomes and long-term cardiac health. Before surgery, maintaining adequate nutrition and preventing physical illness are top clinical priorities. Postoperatively, patients must observe sternal protection guidelines, adhere to prescribed cardiac medications, follow tailored exercise restrictions, and practice lifetime preventative measures, including prophylactic antibiotics prior to dental procedures when indicated.
Key lifestyle modifications include:
- Sternal Precautions: Refrain from pushing, pulling, or lifting heavy objects for 6 to 8 weeks post-surgery to allow proper bone healing. Infant lifting must be done by supporting the back and bottom, avoiding lifting under the arms.
- Infective Endocarditis Prophylaxis: Patients with prosthetic valve material, residual shunts, or uncorrected cyanotic defects require preventive oral antibiotics prior to invasive dental procedures, following ACC/AHA guidelines (Stout et al., 2019).
- Physical Activity & Sports: Athletic participation depends on post-surgical heart function. While most patients with closed simple shunts can participate in un-restricted sports, complex valve or single-ventricle patients require tailored exercise clearance from their cardiologist.
- Nutritional Support: High-calorie enteral feedings support infants in recovering growth curves following cardiac repair.
14. How Outcomes Are Measured
Outcomes in congenital heart surgery are measured using standard clinical endpoints, post-procedural echocardiographic evaluations, and long-term quality-of-life metrics. Clinical success is defined by complete defect correction, normalization of cardiac chamber pressures, resolution of heart failure symptoms, and unhindered physical growth in children. Standardized registry databases track overall operative survival, residual anatomical defect rates, and long-term reoperation rates.
Long-term clinical success relies on objective testing:
- Echocardiographic Imaging: Confirms total elimination of heart shunts, absence of heart valve leakage or blockage, and recovery of normal ventricular pumping function.
- Hemodynamic Stability: Normalization of pulmonary arterial pressures verified by echocardiography or catheterization.
- Somatic Growth Tracking: In infants and children, catching up on height and weight percentiles demonstrates successful resolution of chronic heart failure.
- Functional Capacity: Exercise stress testing in adolescents and adults measures oxygen uptake (VO2 max) and physical endurance, providing an objective score of cardiopulmonary recovery.
15. Recent Advances and Current Standard of Care
Recent advances in congenital heart surgery have significantly improved survival rates and long-term functional outcomes for high-risk neonates and adult patients. Modern innovations include three-dimensional patient-specific anatomical modeling for pre-procedural planning, tissue-engineered vascular grafts, bioresorbable cardiac patches, and hybrid operating suites that combine open surgical access with interventional catheter techniques. These technologies enhance precision and reduce surgical trauma.
Key developments shaping the current standard of care include:
- 3D Printing and Virtual Simulation: Patient-specific CT and MRI data are converted into physical 3D models, allowing cardiothoracic surgeons to simulate complex repairs prior to entering the operating room (Jacobs et al., 2021).
- Hybrid Procedures: Combined surgical and catheter-based interventions, such as hybrid intraoperative stent placement, allow less invasive palliation in fragile neonates without requiring deep hypothermic circulatory arrest.
- Myocardial Preservation Protocols: Advanced cardioplegia formulations protect infant heart muscle tissue during extended surgical procedures, reducing post-operative low cardiac output syndrome.
- Adult Congenital Heart Disease (ACHD) Specialized Centers: Dedicated multidisciplinary care teams address the unique anatomical and secondary health considerations of adults living with repaired childhood heart defects, as recommended by European Society of Cardiology guidelines (Baumgartner et al., 2021).
16. Common Myths and Misconceptions
Misconceptions regarding congenital heart surgery often create unnecessary anxiety for patients and parents facing structural heart repair. Common myths involve assuming surgical repair offers an instant permanent cure without needing long-term follow-up, or believing children cannot participate in normal physical activities after recovery. Clarifying these medical realities with peer-reviewed evidence ensures informed decision-making and optimal long-term care management.
Myth: Congenital heart surgery completely cures structural heart disease, eliminating the need for future heart doctors.
Reality: Surgical repair restores normal blood flow, but many defects leave residual structural or electrical changes. Major cardiology guidelines recommend lifelong follow-up with a specialized congenital cardiologist (Stout et al., 2019).
Myth: Children who undergo open-heart surgery cannot participate in sports or play activities.
Reality: Most children who undergo successful defect repairs achieve normal physical capacity and can safely participate in recreational sports after sternal healing (Baumgartner et al., 2021).
Myth: Congenital heart defects are always inherited and will recur in every child.
Reality: Most congenital heart defects occur from multifactorial developmental causes, with genetic inheritance accounting for approximately 15% to 20% of cases.
Myth: Heart surgery cannot be performed safely on newborn babies weighing under 5 pounds.
Reality: Modern surgical technique, specialized neonatal cardiopulmonary bypass, and advanced ICU care allow safe structural repairs in premature and low-birth-weight neonates (Jacobs et al., 2021).
Myth: Transcatheter device placement has made open congenital heart surgery obsolete.
Reality: While catheter devices effectively treat specific simple defects, open cardiac surgery remains essential for complex structural anomalies, valve reconstructions, and newborn arterial switches.
Myth: A heart murmur after surgery always means the operation failed.
Reality: Postoperative murmurs are common and often harmless, resulting from altered blood flow dynamics through surgically modified structures rather than persistent defects.
17. Frequently Asked Questions
What is the overall success rate of congenital heart surgery?
Current national clinical registries show an overall survival rate exceeding 96% across all congenital cardiac operations (Jacobs et al., 2021). Success rates vary based on defect complexity, ranging from over 99% for simple septal repairs to higher risk profiles for complex single-ventricle reconstructions in fragile neonates.
How long will my child need to stay in the hospital after surgery?
Hospital stay typically ranges from 7 to 14 days for uncomplicated surgical repairs. Complex newborn operations or staged single-ventricle reconstructions may require three to four weeks or longer in the cardiac intensive care unit for recovery and feeding optimization.
Is cardiopulmonary bypass safe for infants and small children?
Cardiopulmonary bypass is a safe standard procedure used worldwide. Modern specialized equipment, blood-sparing techniques, and refined myocardial protection solutions minimize risks, allowing safe cardiac arrest and circulatory support during delicate intraoperative repairs.
When can a child return to school after cardiac surgery?
Most children can safely return to school 3 to 4 weeks after hospital discharge. However, physical education, contact sports, and strenuous activities are restricted for 6 to 8 weeks until sternal bone fusion is complete and verified by a physician.
What is a median sternotomy, and will it leave a permanent scar?
A median sternotomy is a vertical surgical incision made through the chest bone (sternum) to access the heart. It leaves a vertical midline chest scar that fades over time from red to a faint line. Surgeons use hidden or specialized plastic closure techniques whenever clinically feasible.
Will my child need additional cardiac surgeries later in life?
Simple defect repairs, such as closing an isolated atrial or ventricular septal defect, rarely require repeat surgery. However, complex conditions involving synthetic patches, conduit grafts, or single-ventricle pathways often require planned follow-up interventions or conduit replacements as the child grows.
How is pain managed after congenital heart surgery?
Postoperative pain is controlled using a combination of intravenous pain medications, regional nerve blocks, and non-opioid pain relievers like acetaminophen. Patients are transitioned to oral pain medications within a few days, keeping them comfortable enough to breathe deeply and move safely.
Can adults undergo congenital heart surgery?
Yes. Adults diagnosed with previously undetected congenital defects or those requiring reoperation for childhood repairs undergo surgery routinely. Specialized adult congenital cardiothoracic surgeons perform these procedures to treat valve leakages, conduit wear, or complex arrhythmias (Stout et al., 2019).
What are the warning signs of complications after returning home?
Parents and caregivers should seek prompt medical evaluation if they observe fever above 101°F (38.3°C), redness or fluid drainage around the incision, worsening shortness of breath, poor feeding or weight loss, bluish skin discoloration, or unusual lethargy.
Do children require blood transfusions during congenital heart surgery?
Blood transfusions are frequently necessary during open-heart surgery in neonates and small infants due to their small blood volume relative to the tubing volume of the cardiopulmonary bypass machine. Blood products are screened rigorously to ensure safety.
What is the difference between primary repair and palliative surgery?
Primary repair permanently corrects structural defects in a single operation, restoring normal anatomy. Palliative surgery is a supportive intermediate operation that stabilizes blood flow and organ health in complex heart conditions until definitive repair or next-stage palliation can be performed.
Are dental procedures restricted after congenital heart surgery?
Patients with valve repairs, synthetic patches, or artificial material must receive preventive oral antibiotics before invasive dental work to protect against bacterial endocarditis. Your cardiologist will provide written guidance based on AHA/ACC guidelines (Stout et al., 2019).
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