2012, Número 3
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Salud Mental 2012; 35 (3)
Perimenopausia y trastornos afectivos: aspectos básicos y clínicos
Flores RM, Martínez ML
Idioma: Español
Referencias bibliográficas: 84
Paginas: 231-240
Archivo PDF: 325.86 Kb.
RESUMEN
La depresión es un trastorno afectivo de origen multifactorial que se presenta con mayor frecuencia en la mujer que en el hombre. Las causas de esta diferencia se atribuyen tanto a factores sociales como biológicos. La coincidencia entre los periodos de fluctuaciones hormonales y la presencia de síntomas afectivos ha dado fuerza a la teoría de que los factores hormonales pueden ser una causa de la mayor prevalencia de depresión en la mujer. Los estudios básicos en los cuales no se presentan factores sociales sugieren que la depresión en la mujer podría tener un origen biológico.
Uno de los periodos de mayor riesgo en la mujer es la perimenopausia. De acuerdo con el Grupo de Trabajo de los Estadios de la Edad Reproductiva (STRAW), la perimenopausia comprende el periodo denominado transición a la menopausia más un año después de la última menstruación. Este periodo se caracteriza por ciclos menstruales de duración variable y fluctuaciones en la concentración de estrógenos y progesterona. Conforme los ciclos se hacen impredecibles, ocurre una disminución de estrógenos, que genera alteraciones fisiológicas y afectivas. Diversos estudios epidemiológicos han logrado relacionar la perimenopausia con cambios en el estado afectivo de la mujer.
Tomando en cuenta la hipótesis de que la privación de estrógenos se relaciona con los síntomas depresivos en la mujer, los tratamientos con estrógenos han sido considerados como una de las opciones terapéuticas. Los hallazgos clínicos son controvertidos, y la posible explicación son las diferencias en la metodología empleada en cada estudio, así como la falta de consistencia en la definición de perimenopausia y en los instrumentos de medición hormonal y del estado emocional de la mujer. De manera interesante, los estudios básicos apoyan la idea de que los estrógenos producen efectos antidepresivos importantes. Sin embargo, existen diferencias en la respuesta antidepresiva que dependen tanto del tipo de estrógeno como del estado hormonal de la hembra. Hasta el momento, los hallazgos más consistentes refieren al 17β-estradiol como la hormona más relevante para producir acciones antidepresivas en la hembra. El mismo estrógeno es efectivo en ratas viejas, con un periodo de privación hormonal moderado; sin embargo, deja de ser efectivo en la depresión experimental cuando ese periodo se extiende por varios meses.
Otra alternativa terapéutica para tratar la depresión en la perimenopausia y posmenopausia es la terapia combinada de agentes hormonales y fármacos antidepresivos. En dos estudios con un reducido número de pacientes se determinó que la adición de estrógenos favorece el efecto de los fármacos antidepresivos en mujeres con depresión refractaria a dichos tratamientos. La investigación básica aporta resultados consistentes al respecto, ya que, por un lado, se ha determinado que diferentes estrógenos inducen un efecto tipo antidepresivo en ratas ovariectomizadas, y por otro, que la administración de dosis subefectivas de dichos estrógenos facilita el efecto antidepresivo, o incluso acorta la latencia de aparición del efecto antidepresivo de fármacos como la fluoxetina, la desipramina y la venlafaxina. Los resultados sugieren que los estrógenos pueden interactuar con diferentes sistemas de neurotransmisión para mejorar las acciones de los fármacos antidepresivos. Más aún, ha sido demostrado que el sistema serotonérgico participa en buena medida en las acciones antidepresivas de algunos estrógenos, lo cual aporta más evidencia sobre las fallas en la neurotransmisión serotonérgica en etapas de privación hormonal.
La evidencia de los estudios básicos y clínicos apoya la idea de que la mujer tiene periodos de vulnerabilidad afectiva que se relacionan con cambios endocrinos importantes. Los tratamientos para la depresión en la mujer deben ser elegidos con base en las condiciones endocrinas de la paciente, así como en las características propias de los tratamientos.
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