NBP Measurement Limitations
6-2 EarlyVue VS30 Instructions for Use
NBP Measurement Limitations
You cannot measure NBP on patients with heart rate extremes of less than 40 bpm or
greater than 300 bpm, or if the patient is on a heart-lung machine.
NBP measurements may be inaccurate or impossible on patients with the following
conditions:
• An irregular arterial pressure pulse
• Cardiac arrhythmias
• Excessive and continuous movement, such as shivering or convulsions
• Rapid blood pressure changes
• Severe shock or hypothermia that reduces blood flow to the peripheries or any other
clinical condition that can affect peripheral circulation
• Obesity, where a thick layer of fat surrounding a limb dampens the oscillations
coming from the artery
• An edematous extremity
Selecting an NBP Cuff
Select an NBP cuff based on the patient’s arm size. After wrapping the cuff around the
patient’s arm, the index line should fall between the two range lines and the arterial
marking should be over the patient’s brachial artery.
A cuff that is too loose or too tight can cause inaccurate measurements. Also, if the cuff is
too loose, it may not deflate properly.
You can use two types of NBP cuffs:
• Reusable cuffs can be reused on different patients.
• Disposable cuffs must not be reused on different patients; however, they can be
reused or relocated on the same patient.
Use only Philips cuffs and hoses with the EarlyVue VS30. For information on compatible
Philips NBP cuffs and hoses, see Chapter 15, “Approved Accessories and Sensors.”
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