Each of the cuff (10) has a (11, 12) chamber. Cover each cuff of four above (toe and finger) or limb, (PAPG) until a signal is detected pulmonary artery plethysmograph involved in the arterial blood flow in each limb above each chamber (11), above each chamber ( I is inflated to a predetermined pressure at the same time 11). Then, and simultaneously inflated above the chamber (12) PAPG signal in each limb to disappear, to continue to expand higher than the pressure 10mmHg~20mmHg. Then, record the pressure when deflated the chamber multiple (12), PAPG signal (11) chamber of the first reproduced for each limb, and calculates the ABPI the value of this pressure. The ABPI is displayed, or may be transmitted to a remote location.
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