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J Am Soc Echocardiogr. 2014 Apr;27(4):440-7. doi: 10.1016/j.echo.2013.12.010. Epub 2014 Jan 18.

Advanced cardiac amyloidosis associated with normal interventricular septal thickness: an uncommon presentation of infiltrative cardiomyopathy.

Author information

  • 1Mayo Medical School, Mayo Clinic College of Medicine, Rochester, Minnesota.
  • 2Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Rochester, Minnesota.
  • 3Division of Anatomic Pathology, Mayo Clinic, Rochester, Minnesota.
  • 4Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio.
  • 5Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota.
  • 6Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Rochester, Minnesota. Electronic address: pereira.naveen@mayo.edu.

Abstract

BACKGROUND:

Increased interventricular septal (IVS) thickness on echocardiography is a diagnostic criterion for cardiac amyloidosis and classically precedes decrement in left ventricular ejection fraction (LVEF). The investigators describe patients with histologically confirmed cardiac amyloidosis who had significant myocardial dysfunction (LVEF ≤ 40%) despite having normal IVS thickness.

METHODS:

All patients with systemic amyloidosis and LVEFs ≤ 40% were analyzed to identify the prevalence of normal IVS thickness. Patients with known histories of cardiomyopathy or coronary artery disease were excluded. Histologic evaluation of tissue included assessment of amyloid burden and average myocyte diameter.

RESULTS:

There were 255 patients with amyloidosis with LVEFs ≤ 40%, of whom seven (3%) had normal IVS thickness and histologic confirmation of cardiac involvement. Of these, six had immunoglobulin light chain amyloidosis, and one had senile amyloidosis. A majority of patients (86%) presented with new-onset cardiac dysfunction associated with edema and/or dyspnea. Electrocardiographic findings included low voltage (43%) and a pseudoinfarct pattern (29%). The 1-year survival from initial tissue diagnosis in the cohort with normal IVS thickness was similar to matched patients with amyloidosis with increased IVS thickness and LVEF ≤ 40% (21% vs 18%, respectively, P = .32). Myocardial tissue amyloid burden and average myocyte diameter were significantly reduced in cases compared with controls.

CONCLUSIONS:

Cardiac amyloidosis can uncommonly present with normal IVS thickness despite significant myocardial dysfunction. The prognosis of these patients is as poor as those with increased IVS thickness. Amyloidosis should be considered in the differential diagnosis of patients with cardiomyopathy and reduced LVEFs despite normal IVS thickness.

Copyright © 2014 American Society of Echocardiography. Published by Mosby, Inc. All rights reserved.

KEYWORDS:

Amyloid; Cardiomyopathy; Diagnosis; Echocardiography; Heart failure

PMID:
24444660
[PubMed - indexed for MEDLINE]
PMCID:
PMC3972307
[Available on 2015/4/1]
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