The Roman poet Virgil mentions handcuffs as a device that was used by mortals to try to prevent the god Proteus from shape-shifting his way out of sticky situations.

If your shape is shifting toward larger-size biceps (from muscle or from excess weight), you can be difficult to cuff too.

According to a study presented at a recent American Heart Association conference, using a one-size-fits-all cuff when taking blood pressure readings can cause significant inaccuracies, especially for people who should be using a large or extra-large cuff.

The researchers found that when a "regular" cuff was put on a large arm, the systolic (top number) blood pressure reading was inaccurately raised by an average of 4.8 mmHg, and when that "regular" cuff was put on an extra-large arm, the inaccurate reading soared by almost 20 mmHg.

On average, individuals who required an extra-large cuff had a blood pressure reading of 143.9/86.5 mmHg when a regular adult cuff was used, but an appropriately sized cuff resulted in a reading of 124.2/79.1 mmHg, which is within the normal range. 

That's a serious misdiagnosis, and one that you as a patient are going to have to take charge of the next time you get a checkup.

If the cuff feels much too tight when inflated, or if your blood pressure registers higher than normal, ask the doctor or nurse to measure your arm circumference and choose an appropriate-size cuff.

Then compare the two readings. Your doctor may be surprised, and you may be relieved.