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  • Title: [Association of the carotid sinus syndrome and orthostatic hypotension. Another potential cause of the failure of VVI electrostimulation].
    Author: Brignole M, Barra M, Sartore B, Bertulla A.
    Journal: G Ital Cardiol; 1985 Oct; 15(10):971-3. PubMed ID: 4092916.
    Abstract:
    The systolic blood pressure was measured during clinostatism and 15'', 1', 5' after standing in 101 patients with carotid sinus syndrome and in 101 controls matched for age, sex, and prevalence of organic heart disease. In the carotid sinus syndrome group we observed a greater systolic blood pressure reduction from the supine to standing position (20 +/- 19 vs 14 +/- 11 mmHg), a lower orthostatic pressure (111 +/- 23 vs 120 +/- 21 mmHg) and a greater incidence of orthostatic hypotension (defined as a blood pressure reduction greater than or equal to 50 mmHg or greater than or equal to 20 mmHg when orthostatic pressure was lower than 100 mmHg) (35% vs 17%). Twenty-three carotid sinus syndrome patients received a VVI pacemaker for control of their symptoms; after a mean follow-up of 12.2 +/- 7.7 months, unchanged or reduced symptoms persisted in 6 out 9 (67%) patients with previous orthostatic hypotension while only in 1 out of 14 (7%) patients without this feature. In conclusion, orthostatic hypotension is frequently associated with a carotid sinus syndrome and may account for relapses in some patients treated with VVI pacing.
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