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  Indian J Med Microbiol
 

Figure 1: Usefulness of dobutamine stress echocardiography for clinical decision-making. The “?” indicates the parameters and criteria that needs to be further validated or refined. FR: flow rate (in ml/second); AVA: aortic valve area (in cm2); MG: mean transvalvular gradient (in mmHg); LG-AS: low-gradient severe aortic stenosis (AVA ≤ 1.0 cm2 and MG < 40 mmHg); LF: low-flow (stroke volume index < 35 ml/m2); NF: normal flow (stroke volume index ≥ 35 ml/m2): AVAProj: projected AVA at normal flow rate (in cm2); SAS: severe aortic stenosis; MDCT: multidetector computed tomography; MDCTThr: aortic valve calcium score thresholds measured by MDCT: men > 2000 AU and women > 1200 AU, aortic valve calcium density (i.e., calcium score divided by aortic annulus area) ≥500 AU/cm2 in men, ≥300 AU/cm2 in women)

Figure 1: Usefulness of dobutamine stress echocardiography for clinical decision-making. The “?” indicates the parameters and criteria that needs to be further validated or refined. FR: flow rate (in ml/second); AVA: aortic valve area (in cm<sup>2</sup>); MG: mean transvalvular gradient (in mmHg); LG-AS: low-gradient severe aortic stenosis (AVA ≤ 1.0 cm<sup>2</sup> and MG < 40 mmHg); LF: low-flow (stroke volume index < 35 ml/m<sup>2</sup>); NF: normal flow (stroke volume index ≥ 35 ml/m<sup>2</sup>): AVA<sub>Proj</sub>: projected AVA at normal flow rate (in cm<sup>2</sup>); SAS: severe aortic stenosis; MDCT: multidetector computed tomography; MDCT<sub>Thr</sub>: aortic valve calcium score thresholds measured by MDCT: men > 2000 AU and women > 1200 AU, aortic valve calcium density (i.e., calcium score divided by aortic annulus area) ≥500 AU/cm<sup>2</sup> in men, ≥300 AU/cm<sup>2</sup> in women)