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Phasic aortic flow velocity in patients with pulsus alternans
  1. A. Benchimol,
  2. Egeu C. Barreto,
  3. Stephen Teng Wei Tio
  1. The Institute for Cardiovascular Diseases, Good Samaritan Hospital, 1033 East McDowell Road, Phoenix, Arizona 85006, U.S.A.


    Phasic aortic flow velocity was recorded in two patients with pulsus alternans using a flow velocity probe connected to a Doppler ultrasonic flowmeter system. The variations in beat-to-beat peak velocity paralleled the variations in arterial and ventricular systolic pressures. This study provides direct evidence that stroke volume varies during this abnormal haemodynamic status. It is conceivable, though not proved in this study, that this phenomenon may be secondary to alternation between large and small end-diastolic fibre length.

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    • 1 Supported in part by Research Grant from Arizona Heart Association.

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