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a Chapter 4 Spectral Doppler Sonography: Waveform Analysis and Hemodynamic Interpretation 51<br />

Table 4.2. Alterations of circulatory parameters in response to vasodilation and vasoconstriction (from [41] with permission)<br />

Parameter Baseline Hydralazine Norepinephrine<br />

Heart rate (bpm) 132Ô15 164Ô14 82Ô10*<br />

Mean arterial blood pressure (mmHg) 78Ô5 55Ô5* 122Ô8*<br />

Mean volumetric flow, descending aorta (ml/min) 319Ô21 405Ô28* 138Ô22*<br />

Data are means Ô SEM. * Significant difference from baseline parameter (p

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