-transparent.png){kind=logo}
BACKGROUND A fibromuscular band has been detected in patients with idiopathic left ventricular tachycardia, and this band has been suggested to be the anatomic substrate for the arrhythmia. Whether the fibromuscular band is a specific substrate for the tachycardia was systematically evaluated in a large group of consecutive patients with and without idiopathic left ventricular tachycardia. RESULTS Conventional transthoracic two-dimensional echocardiography and multiplane transesophageal echocardiography were performed in 18 patients with idiopathic left ventricular tachycardia that was responsive to calcium blockers (group 1, tachycardia patients) and 40 patients with paroxysmal supraventricular tachycardia (group 2, control patients). There were 17 men and 1 woman, with a mean age of 29 +/- 11 years, in group 1 patients, and 21 men and 19 women, with a mean age of 42 +/- 12 years, in group 2 patients. The QRS morphology during tachycardia in group 1 patients displayed a pattern of right bundle-branch block with superior axis in 15 patients, indeterminate axis in 2 patients, and inferior axis in 1 patient. Radiofrequency ablation successfully eliminated the tachycardia in all 18 patients; the successful ablation site was located at the inferior apical septum in 11 patients, at the midseptum in 6 patients, and at the anterior lateral wall in 1 patient. Transthoracic echocardiography detected the fibromuscular band in 11 of the 18 patients, whereas multiplane transesophageal echocardiography detected the band in 17 of 18 patients. The fibromuscular band extended from the interventricular septum to the apex of the left ventricle. In group 2 patients, transthoracic echocardiography detected the fibromuscular band in 22 and multiplane transesophageal echocardiography detected the band in 35 of the 40 patients. The presence of a fibromuscular band in these two groups of patients was not statistically different. CONCLUSIONS The presence of a left ventricular fibromuscular band is not a specific anatomic substrate for idiopathic left ventricular tachycardia.
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
February 1996,
Circulation,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
July 2005,
Indian pacing and electrophysiology journal,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
June 1998,
Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
November 1997,
Pacing and clinical electrophysiology : PACE,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
January 2017,
Heart views : the official journal of the Gulf Heart Association,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
May 1997,
Journal of cardiovascular electrophysiology,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
November 2008,
Journal of the Medical Association of Thailand = Chotmaihet thangphaet,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
September 2001,
Pacing and clinical electrophysiology : PACE,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
April 2005,
Pacing and clinical electrophysiology : PACE,
F C Lin, and
M S Wen, and
C C Wang, and
S J Yeh, and
D Wu
January 2021,
Journal of Ayub Medical College, Abbottabad : JAMC,
