Kandil, H.I., el ghany, M.M.A., Risk, H., Darwish, R.M., Osama, D. and Ibrahim, M.A. 2018. Valsalva Maneuver in diastolic heart failure, diastolic dysfunction and systolic heart failure clinically BNP and echocardiography. Journal of Cardiovascular Medicine and Cardiology. 5, 4 (Oct. 2018), 048–052. DOI:https://doi.org/10.17352/2455-2976.000071.