Volume 108, Issue 2, Pages (August 1995)

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Volume 108, Issue 2, Pages 515-521 (August 1995) Determination of Vascular Impedance in the Peripheral Circulation by Transcutaneous Pulsed Doppler Ultrasound Steven Solomon, PhD, Stuart D. Katz, MD, William Stevenson-Smith, MD, Edward L. Yellin, PhD, Thierry H. Lejemtel, MD CHEST Volume 108, Issue 2, Pages 515-521 (August 1995) DOI: 10.1378/chest.108.2.515 Copyright © 1995 The American College of Chest Physicians Terms and Conditions

FIGURE 1 Representative example of blood flow velocity waveforms obtained noninvasively by Doppler ultrasound (open diamonds) and invasively by electromagnetic flow probe (asterisks) in the time domain. CHEST 1995 108, 515-521DOI: (10.1378/chest.108.2.515) Copyright © 1995 The American College of Chest Physicians Terms and Conditions

FIGURE 2 Frequency spectra corresponding to blood flow velocity waveforms obtained noninvasively by Doppler ultrasound (open diamonds) and invasively by electromagnetic flow probe (asterisks). CHEST 1995 108, 515-521DOI: (10.1378/chest.108.2.515) Copyright © 1995 The American College of Chest Physicians Terms and Conditions

FIGURE 3 Mean values for baseline impedance moduli of a frequency spectra derived from noninvasively determined Doppler blood flow velocity and invasively determined electromagnetic blood flow velocity and simultaneous high-fidelity recording of common femoral artery pressure. CHEST 1995 108, 515-521DOI: (10.1378/chest.108.2.515) Copyright © 1995 The American College of Chest Physicians Terms and Conditions

FIGURE 4 Mean values for baseline impedance moduli of a frequency spectra derived from noninvasively determined Doppler blood flow velocity and invasively determined electromagnetic blood flow velocity and simultaneous high-fidelity recording of common femoral artery pressure after intra-arterial administration of acetylcholine. CHEST 1995 108, 515-521DOI: (10.1378/chest.108.2.515) Copyright © 1995 The American College of Chest Physicians Terms and Conditions

FIGURE 5 A representative vascular impedance spectrum derived from noninvasive measurements of blood flow velocity by Doppler ultrasonography and high-fidelity pressure recording in the superficial femoral artery of three normal subjects prior to (solid circles) and after (open circles) intra-arterial administration of acetylcholine. CHEST 1995 108, 515-521DOI: (10.1378/chest.108.2.515) Copyright © 1995 The American College of Chest Physicians Terms and Conditions