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Reserva de flujo coronario en hombres jóvenes con hiperlipidemia combinada familiar

O P Pitkänen¹, P Nuutila, O T Raitakari

¹Departments of Medicine and Clinical Physiology, Turku PET Centre, Turku University, Turku, Finland.

|April 6, 1999

Resumen

Los pacientes jóvenes con hiperlipidemia combinada familiar (FCHL) muestran una disminución de la reactividad coronaria, particularmente aquellos con el fenotipo IIB. Esto sugiere que las anomalías metabólicas en FCHL contribuyen al riesgo temprano de enfermedad cardíaca.

Área de la Ciencia:

Medicina Cardiovascular La medicina cardiovascular es una especialidad de la salud.
El metabolismo de los lípidos.
Imágenes médicas de imágenes médicas.

Sus antecedentes:

La hiperlipidemia combinada familiar (FCHL) es un trastorno genético común que afecta el metabolismo de las lipoproteínas.
La FCHL está relacionada con el 10-20% de los casos prematuros de enfermedad coronaria.
El estudio investiga la reactividad coronaria en pacientes asintomáticos con FCHL.

Objetivo del estudio:

Para evaluar la reactividad coronaria en pacientes asintomáticos con hiperlipidemia familiar combinada.
Para determinar si existen anomalías funcionales en la regulación del flujo sanguíneo coronario en FCHL.
Para comparar la reactividad coronaria entre pacientes con FCHL y controles sanos.

Principales métodos:

La tomografía por emisión de positrones (PET) con agua etiquetada con 15O se utilizó para medir el flujo sanguíneo miocárdico (MBF).
MBF se evaluó en reposo y durante la hiperemia farmacológica inducida por dipyridamole.
Se estudiaron 21 pacientes masculinos con FCHL y 21 controles sanos de la misma edad.

Principales resultados:

Los pacientes asintomáticos con LCCHF exhibieron menor FMB durante la vasodilatación máxima en comparación con los controles (P=0,025).
La reserva de flujo coronario (CFR, por sus siglas en inglés) no difería significativamente entre los grupos, pero mostró una alta variabilidad en pacientes con FCHL.
Los pacientes con fenotipo IIB de FCHL demostraron un flujo hiperémico y CFR significativamente más bajos en comparación con el fenotipo IIA.

Conclusiones:

Las anomalías funcionales en la regulación del flujo coronario están presentes en pacientes jóvenes y asintomáticos con FCHL, especialmente en aquellos con fenotipo IIB.
Estos hallazgos apoyan el vínculo entre las anomalías metabólicas de la FCHL y su fisiopatología asociada.
El fenotipo IIB puede estar particularmente asociado con una disminución de la reactividad coronaria en FCHL.

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