What condition causes a new harsh grade 4 systolic ejection murmur and a boot‑shaped cardiac silhouette on chest radiograph?

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Last updated: April 3, 2026 • View editorial policy

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Tetralogy of Fallot

The combination of a harsh grade 4 systolic ejection murmur and a boot-shaped cardiac silhouette on chest x-ray is pathognomonic for Tetralogy of Fallot (ToF). 1

Clinical Presentation

This classic radiographic finding represents the characteristic cardiac anatomy of ToF, which consists of four key components 2:

  • Subpulmonary infundibular stenosis (causing the harsh systolic ejection murmur)
  • Ventricular septal defect (VSD)
  • Overriding aorta (less than 50% override)
  • Right ventricular hypertrophy (contributing to the boot-shaped appearance)

The Boot-Shaped Heart

The distinctive "boot-shaped" or "coeur en sabot" appearance on chest x-ray results from 1:

  • Upturned cardiac apex from right ventricular hypertrophy
  • Concave pulmonary artery segment due to pulmonary artery hypoplasia and stenosis
  • Right aortic arch (present in approximately 25% of cases) 2

The Systolic Ejection Murmur

The harsh grade 4 systolic ejection murmur originates from 2:

  • Right ventricular outflow tract (RVOT) obstruction at multiple potential levels
  • Infundibular (subpulmonary) stenosis
  • Pulmonary valve stenosis (valve is often small and stenotic)
  • Pulmonary artery hypoplasia or stenosis

Presentation Context

Unoperated Adult Patients

While rare in developed countries, unoperated ToF can present in adulthood in 2:

  • Immigrants without prior access to cardiac surgery
  • "Pink tetralogy" patients with relatively mild pulmonary obstruction and minimal cyanosis
  • These cases are often initially misdiagnosed as simple VSD due to the loud precordial murmur

Key Diagnostic Pitfall

The loud murmur can mislead clinicians into diagnosing a simple VSD rather than recognizing the complete ToF anatomy. Always obtain a chest x-ray when evaluating a loud systolic murmur—the boot-shaped heart immediately distinguishes ToF from isolated VSD. 2

Additional Clinical Findings to Expect

Beyond the murmur and x-ray findings, look for:

  • Cyanosis and clubbing (in patients with severe RVOT obstruction)
  • Continuous murmurs over the thorax (if abundant aorticopulmonary collaterals are present)
  • Right ventricular heave from RV hypertrophy
  • Single or loud S2 (P2 component may be diminished or absent)

Immediate Next Steps

Transthoracic echocardiography is mandatory to confirm the diagnosis and define 2:

  • VSD size and location (typically large and subaortic)
  • Degree and level(s) of RVOT obstruction
  • Pulmonary artery anatomy and size
  • Aortic override percentage
  • Associated lesions (ASD, coronary anomalies)

Cardiac catheterization may be needed to fully delineate coronary artery anatomy before any surgical intervention, as anomalous coronary arteries (particularly left anterior descending) are common and critical to identify pre-operatively 2.

References

1
Research

Classic imaging signs of congenital cardiovascular abnormalities.

Radiographics : a review publication of the Radiological Society of North America, Inc, 2007

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