Antimyosin antibody cardiac imaging: Its role in the diagnosis of myocarditis

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Journal of the American College of Cardiology; (USA)

DOI:https://doi.org/10.1016/0735-1097(90)90463-Y· OSTI ID:6642473

Dec, G W; Palacios, I; Yasuda, T; Fallon, J T; Khaw, B A; Strauss, H W; Haber, E ^[1]

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1. Massachusetts General Hospital, Boston (USA)

Right ventricular endomyocardial biopsy currently remains the procedure of choice for identifying patients with symptomatic heart failure due to myocarditis from the larger population with idiopathic dilated cardiomyopathy. Despite its specificity, the sensitivity of right ventricular biopsy remains uncertain because of the focal or multifocal nature of the disease. Because myocyte necrosis is an obligate component of myocarditis, the use of indium-111 antimyosin imaging was evaluated in 82 patients with suspected myocarditis. Seventy-four patients had dilated cardiomyopathy of less than 1 year's duration (mean left ventricular ejection fraction 0.30 +/- 0.02); eight patients had normal left ventricular function (mean ejection fraction 0.59 +/- 0.03). Symptoms at presentation included congestive heart failure (92%), chest pain mimicking myocardial infarction (6%) and life-threatening ventricular tachyarrhythmias (2%). All patients underwent planar and single photon emission computed tomographic (SPECT) cardiac imaging after injection of indium-111-labeled antimyosin antibody fragments and right ventricular biopsy within 48 h of imaging. Antimyosin images were interpreted as either abnormal or normal and correlated with biopsy results. On the basis of the right ventricular histologic examination, the sensitivity of antimyosin imaging was 83%, specificity 53% and predictive value of a normal scan 92%. Improvement in left ventricular function occurred within 6 months of treatment in 54% of patients with an abnormal antimyosin scan compared with 18% of those with a normal scan (p less than 0.01). Antimyosin cardiac imaging may be useful for the initial evaluation of patients with dilated and nondilated cardiomyopathy and clinically suspected myocarditis.

• OSTI ID: 6642473
• Journal Information: Journal of the American College of Cardiology; (USA), Vol. 16:1, Issue 1; ISSN 0735-1097
• Country of Publication: United States
• Language: English

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62 RADIOLOGY AND NUCLEAR MEDICINE
CARDIOVASCULAR DISEASES
DIAGNOSIS
MYOCARDIUM
SCINTISCANNING
INDIUM 111
MAN
MONOCLONAL ANTIBODIES
MYOSIN
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
ANIMALS
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BETA DECAY RADIOISOTOPES
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EMISSION COMPUTED TOMOGRAPHY
GLOBULINS
HEART
INDIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAMMALS
MINUTES LIVING RADIOISOTOPES
MUSCLES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
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550601* - Medicine- Unsealed Radionuclides in Diagnostics