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• W2994881534 abstract "Abstract Objectives We planned to assess the right ventricular mechanics in subjects with typical chest pain and angiographically normal coronary arteries (microvascular angina [MVA]) and to search for an association between right ventricular mechanics, coronary flow reserve, and exercise tolerance. Methods Seventy‐one patients with MVA (mean age of 48.5 ± 7.9 years, 63% female) and 30 healthy control subjects were recruited. Right ventricular mechanics were calculated utilizing speckle tracking imaging. The exercise capacity was assessed by metabolic equivalents (METs). Coronary flow reserve (CFR) was calculated as the ratio between hyperemic ( in response to intravenous adenosine ) diastolic peak flow velocity and the basal diastolic peak velocity. Results Coronary flow reserve (a surrogate marker of microvascular dysfunction) was diminished in MVA patients compared with the control group (2.41 ± 0.35 vs 3.35 ± 0.5; P < .03). Patients with lower right ventricular global longitudinal strain (RVGLS) and right ventricular global longitudinal strain rate (RVGLSr) had a considerably lower CFR ( P < .001) and a significantly lower MET ( P < .001) than patients with normal RV mechanics. Right ventricular global longitudinal strain and RVGLSr were significantly correlated with both CFR and METs in subjects with MVA. Receiver operating characteristic (ROC) curve analysis demonstrated that RVGLS ≤ −14.5 was the best cutoff value for the prediction of impaired exercise tolerance in patients with MVA. Conclusion We suggested that impaired right ventricular mechanics in subjects with microvascular angina was associated with reduced exercise capacity. Moreover, right ventricular mechanics is significantly correlated with coronary flow reserve. Henceforth, right ventricular mechanics might be of value for both risk stratification and follow‐up in cases with microvascular dysfunction." @default.
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• W2994881534 date "2019-12-16" @default.
• W2994881534 modified "2023-10-18" @default.
• W2994881534 title "Right ventricular mechanics and exercise capacity in patients with microvascular angina: The impact of microvascular function" @default.
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• W2994881534 doi "https://doi.org/10.1111/echo.14563" @default.
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