Oscillometric Method - Methods of Blood Pressure Measurement
Saturday, Dec 22 2007
A second type of noninvasive blood pressure measurement strategy, the oscillometric method, also employs an occluding cuff. However, in contrast to the auscultatory method, which relies on detection of Korotkoff sounds, the oscillometric method operates by sensing the magnitude of oscillations caused by the blood as it begins to flow again into the limb.
Typically, very faint blood flow oscillations begin to be detected as the air pressure in the cuff coincides with SBP. As air pressure is slowly released from the occluding cuff, the amplitude of these pulsatile oscillations increases to a point and then decreases as blood flow to the limb normalizes. Although the oscillation with the greatest amplitude has been shown to correspond reliably with mean arterial pressure (Mauck et al., 1980), determinations of SBP, which are associated with a marked increase in amplitude of oscillations, and DBP, which are associated with the point at which oscillations level off, are often less accurate when compared with auscultatory measures (Fowler et al., 1991).
Therefore, while oscillometric methods tend to overestimate SBP and underestimate DBP (Maheswaran et al., 1988; Manolio et al., 1988), they can be useful for determining accurate estimates of mean arterial pressure.
Suchday, S., and Larkin, K. T.
Published with assistance from the foundation established in memory of Amasa Stone Mather of the Class of 1907, Yale College.
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Last revised: by Dr. Felix Yankovsky, M.D.
Provided by Armina Hypertension Association
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