Why Blood Pressure Readings May Be Off

October 28, 2014 7:09 PM

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When one nephrologist at an Ottawa hospital asked a patient to bring in his home blood pressure monitoring machine, he only planned to teach him how to use it. But he noticed something strange. The measurement was 21 units off from the device the doctor uses in his office, a gulf that can mean the difference between normal and high blood pressure.

“That took me aback, because in some patients we are looking at home readings to make our decisions for treatment,” says Dr. Swapnil Hiremath of The Ottawa Hospital. So he decided to check out the machines of all his patients, expecting no more than 1% of the machines to give the wrong reading. Inst...

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