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1996-02-26
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Document 0543
DOCN M9620543
TI Predictive model to assess risk for cardiac allograft vasculopathy: an
intravascular ultrasound study.
DT 9602
AU Mehra MR; Ventura HO; Chambers R; Collins TJ; Ramee SR; Kates MA; Smart
FW; Stapleton DD; Department of Internal Medicine, Ochsner Medical
Institutions,; New Orleans, Louisiana 70121, USA.
SO J Am Coll Cardiol. 1995 Nov 15;26(6):1537-44. Unique Identifier :
AIDSLINE MED/96060951
AB OBJECTIVES: This study was performed to assess the influence and
interdependence of immunologic and nonimmunologic risk factors in the
development of cardiac allograft vasculopathy. Another primary objective
was to establish a clinically useful model for risk assessment of
cardiac allograft vasculopathy that would facilitate identifying those
heart transplant recipients likely to have severe intimal proliferation
and thereby at greater risk for adverse clinical events. BACKGROUND: To
our knowledge, no comprehensive intravascular ultrasound study has
assessed the relative influences of both nonimmunologic and immunologic
factors in the development of cardiac allograft vasculopathy, currently
the major limitation to long-term cardiac allograft survival. METHODS:
Using a computer-assisted model of stepwise logistic regression,
immunologic and nonimmunologic risk factors were evaluated to help
identify the development of severe intimal thickening in 101 subjects
who underwent intravascular ultrasound. Prospective validation of the
findings was performed in a separate consecutive cohort of 37 heart
transplant recipients, and the accuracy of this model to predict a
relative risk > 1 for the development of severe intimal hyperplasia was
assessed. RESULTS: Significant independent predictors of severe intimal
hyperplasia in this model included a donor age > 35 years, a first-year
mean biopsy score > 1 (a measure not only of severity of rejection, but
also of frequency of insidious rejection) and hypertriglyceridemia at
two incremental levels of risk (150 to 250 mg/dl [1.70 to 2.83
mmol/liter] and > 250 mg/dl [2.83 mmol/liter]). Based on the absence (0)
or presence (1) of these factors, 12 individual categories of risk were
ascertained with increasing relative risks and predicted probabilities
for severe intimal hyperplasia. Prospective validation of this model
revealed a sensitivity and specificity of 70% and 90%, respectively, and
the positive and negative predictive values were 85% and 80%,
respectively. Additionally, subjects with severe intimal thickening had
a four-fold higher cardiac event rate than those without severe intimal
proliferation on intravascular ultrasound. CONCLUSIONS: This study
establishes a clinically useful predictive model that can be applied to
individual heart transplant recipients to assess their risk for
developing significant cardiac allograft vasculopathy and, thus, aids in
the identification of patients at risk for cardiac events in whom closer
surveillance and risk factor modification may be warranted.
DE Adult Aged Confounding Factors (Epidemiology) Coronary
Vessels/*PATHOLOGY/*ULTRASONOGRAPHY Death, Sudden, Cardiac/ETIOLOGY
Female Graft Rejection/IMMUNOLOGY Heart Transplantation/*ADVERSE
EFFECTS/IMMUNOLOGY/PATHOLOGY/ *ULTRASONOGRAPHY Human
Immunosuppression Logistic Models Male Middle Age Myocardial
Infarction/ETIOLOGY Predictive Value of Tests Prospective Studies
Risk Factors Sensitivity and Specificity Transplantation, Homologous
Tunica Intima/PATHOLOGY/ULTRASONOGRAPHY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).