P1033Evaluation of the diastolic dysfunction in obstructive sleep apnea syndrome with the speckle echocardiography method

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Purpose: Establishment of the relationship between the OSAS (obstructive sleep apnea syndrome) severity and the early diastolic strain rate (Esr), late dastolic strain rate (Lsr), ratio of Esr and Lsr for all fibers (longitudinal (L), radial (R) and circumferential) individually and the strain rate of the isovolumic relaxation time of the longitudinal fibers (L-IVRT-Sr).Method: 21 controls (G0) and 58 patients with normal EF (ejection fraction); according to the apnea-hypopnea indices (AHI); mild (AHI=5-15/G1), moderate (AHI=15-30/G2), severe (AHI>30)/G3) were included.Standart echocardiography and STE (speckle tracking echocardiography) performed.The average values of all segments were calculated and expressed as the global values.Results: Beginning with the G2 the Esr of the C and R fibers decrease along with the OSAS severity but the L Esr was not different between G2 and G3.The Lsr of all fibers increase along with the disease severity but Lsr of R fibers was not different between G2 and G3.The Esr/Lsr ratio of the all fibers and the L-IVRT-Sr decrease along with the OSAS severity (Table 1).Conclusion: The diastolic functions of all fibers are impaired in OSAS, and this increases with OSAS severity.

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