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Evidenced Based Practice on Blood Pressure in Arm Vs. Forearm. Sarah Kneaskern , Andrew Nottleman , Laura Phillips. Appropriate BP Cuff Size . Proper sized blood pressure cuffs are important for accurate readings. BP cuff that is too small causes false high BP reading.
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Evidenced Based Practice on Blood Pressure in Arm Vs. Forearm Sarah Kneaskern, Andrew Nottleman, Laura Phillips
Appropriate BP Cuff Size • Proper sized blood pressure cuffs are important for accurate readings. • BP cuff that is too small causes false high BP reading. • BP cuff that is too big causes false low BP reading. • Width of the cuff is 40% of the circumference of midpoint of the limb being used. • The bladder of the cuff should encircle at least 80% of the upper arm.
Positioning for BP Measurement • While obtaining BP make sure the arm is at heart level. • In sitting position, support and raise the arm to heart level. • While supine, may use a pillow to prop the arm at heart level. • Taking a BP in an unsupported arm can increase systolic BP up to 10 mm/hg. • Crossing the legs while obtaining BP can also increase BP, so keep legs uncrossed.
Forearm BP Indications • BP measurements in the upper arms may be contraindicated due to IVs, fistulas, casts, mastectomies, or obesity. In this case the forearm may be used for blood pressures. • Position the appropriate size cuff midway between the elbow and the wrist with the artery marker at the radial artery. • The forearm and upper arm BP reading are not interchangeable. If you use the forearm to obtain BP, you must DOCUMENT this information.
Forearm BP • BP may vary 5-10 mm/Hg between extremities this is considered normal (this is why an average is recorded for the initial visit). • BP cuff size and circumference of the arm is a proportional relationship but do not use the same BP cuff on both sites. • Forearm BP results in a 10-30 mm/Hg increase in BP Vs. an upper arm BP.
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