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Angiology
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Absent Conal Septum in Tetralogy of Fallot

An Angiographic Study

Pravin K. Goel, MD, AFACA

Department of Cardiology Sanjay Gandhi Postgraduate Institute of Medical Sciences Raebareli Road Lucknow 226 014, India

Madhukar Shahi, MD, DNB

Department of Cardiology Sanjay Gandhi Postgraduate Institute of Medical Sciences Raebareli Road Lucknow 226 014, India

T.S. Mahant, MCh

Department of Cardiology Sanjay Gandhi Postgraduate Institute of Medical Sciences Raebareli Road Lucknow 226 014, India

P.K. Mittal, MCh

Department of Cardiology Sanjay Gandhi Postgraduate Institute of Medical Sciences Raebareli Road Lucknow 226 014, India

S. Radhakrishnan, MD

Department of Cardiology Sanjay Gandhi Postgraduate Institute of Medical Sciences Raebareli Road Lucknow 226 014, India

Pravin K. Goel, MD, AFACA

Department of Cardiology Sanjay Gandhi Postgraduate Institute of Medical Sciences Raebareli Road Lucknow 226 014, India

Absent conal septum in tetralogy of Fallot (TF) is usually noted intraoperatively when the ventricular septal defect (VSD) is found abutting the pulmonary valve, its superior rim being nearly inaccessible transatrially, and the posterior rim being separated from the tricuspid valve (TV) by a muscular ridge. The authors retrospectively analyzed angiograms of 208 consecutive patients with TF seen at their center from July 1989 to December 1995 for absence of the conal septum and the presence of an interval between the TV and the margin of the VSD in 30° right anterior oblique view. In 13 (6%) patients, angiograms were inadequate or of poor quality for assessment and were excluded. Twenty-two of the remaining 195 (11%) patients had a large muscular interval between the tricuspid annulus and the margin of the VSD, which was associated with an absent conal septum in 14 (7.2%) and a diminutive septum in 8 (4%) patients. Nine of the 14 patients with an absent conal septum at angiography underwent surgery, and this finding was confirmed in all. The authors conclude that absent conal septum is not uncommon in TF and constitutes an important variation in its anatomy that can be identified preop eratively at angiography for optimal surgical management.

Angiology, Vol. 48, No. 7, 643-647 (1997)
DOI: 10.1177/000331979704800712
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