ASI, ABI, and PWV
MS-3000 offers Ankle Brachial Index (ABI) and Arterial Stiffness Index (ASI) as indicators for assessment of arterial stiffness for healthcare professionals. These measurements allow speedy and objective analysis of vascular function. Such data can provide valuable information to healthcare professionals. (Data may be used to determine whether to start treatment in patients without any noticeable symptoms or clinical signs.)
While a healthy heart efficiently supplies oxygen and nutrients throughout the body, it also sends waste to the kidneys, liver and lungs for removal. For this to occur, arteries must be in good condition. Arteries may become atherosclerotic, arteriosclerotic or stiffened (due to reduced elasticity and increased stenosis) over time. These changes will cause strain on the heart, valves and arteries, which may cause stroke, heart attack, renal failure and/or sudden death.
ASI measures whether the vascular system is functioning normally without any limitations due to health risks. Arterial stiffness due to medial calcification and reduced elasticity caused by aging is the most critical factor contributing to increase in ASI. Unlike other measuring principles for arterial stiffness, ASI allows efficient assessment of arterial stiffness directly under a cuff, thus making it e a useful index for assessing arterial stiffness in each extremity.
ABI is an index to assess peripheral arterial diseases (P.A.D.) such as stenosis/occlusion of leg arteries. It is calculated by dividing systolic blood pressure of the right and left ankles by that of upper arm (right or left, whichever higher).
PWV measures stiffness of artery by calculating of the velocity of heat beat.
Pulsation caused by blood extruded from the heart reaches the periphery of limbs through the walls and blood in artery.
Property like vascular walls is generally slow in transmission when soft. In contrary, the property of transmitting is fast when hard. For this reason, pulsation is transmitted fast in hard vessels where the arteriosclerosis progresses and the elasticity of the arterial wall are lost.
Pulse wave propagation speed (PWV) is calculated by fitting the pressure band of the blood pressure monitor on both arms and ankle, measuring the distance between sensors and the time required to reach the pulse wave. The higher the value, the more arteriosclerosis is progressing.