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Elevated plasma renin activity in aortitis syndrome.

K Abe, S Miyazaki, T Kusaka

    Japanese Heart Journal
    |January 1, 1976
    PubMed
    Summary

    Aortitis syndrome significantly elevates plasma renin activity (PRA), often causing hypertension. Carotid artery issues in Takayasu's arteritis patients are linked to abnormal renin release, suggesting a role for the carotid sinus reflex.

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    Area of Science:

    • Cardiovascular Medicine
    • Nephrology
    • Endocrinology

    Background:

    • Aortitis syndrome, including Takayasu's arteritis, can lead to renovascular hypertension.
    • Elevated plasma renin activity (PRA) is implicated in the pathophysiology of certain hypertensive conditions.

    Purpose of the Study:

    • To investigate plasma renin activity (PRA) levels in patients with aortitis syndrome.
    • To explore the relationship between aortitis subtypes, renal arterial stenosis, carotid artery lesions, and PRA.
    • To determine the role of the carotid sinus reflex in renin hypersecretion in Takayasu's arteritis.

    Main Methods:

    • Measurement of resting peripheral vein blood PRA in 38 aortitis syndrome patients and comparison with normal subjects.
    • Categorization of patients based on aortitis type (aortic arch, extensive, abdominal) and presence of renovascular hypertension or carotid artery stenosis.
    • Assessment of renin secretion response to upright posture and the effect of carotid sinus nerve denervation.

    Main Results:

    • Patients with aortitis syndrome exhibited PRA levels three times higher than normal subjects.
    • Elevated PRA was significantly higher in patients with renovascular hypertension compared to those without.
    • Stenosis or obstruction of common carotid arteries was associated with significantly higher PRA and hyperresponse to postural changes.

    Conclusions:

    • Aortitis syndrome is associated with significantly elevated plasma renin activity.
    • Carotid artery lesions and associated carotid sinus reflex instability appear to be a primary driver of renin hypersecretion in Takayasu's arteritis.
    • These findings suggest a link between the carotid sinus reflex and renin-mediated hypertension in aortitis syndrome.

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