Scientists have developed a new technique to measure the stiffness of the aorta - a common risk factor for heart disease - which works by monitoring the pulse in your finger.
The new procedure developed by Gary Pierce, assistant professor in the Department of Health and Human Physiology, University of Iowa, works by placing an instrument called a transducer on the finger or over the brachial artery, located inside the arm just beneath the elbow. The readout, combined with a person's age and body mass index, lets physicians know whether the aorta has stiffened.
A person's heart has to work harder when the aorta, the large artery that leaves the heart and delivers blood to the body's tissues, stiffens due to ageing and an inactive lifestyle.
The harder a person's heart needs to work, the higher risk he or she has for developing high blood pressure, stroke and a heart attack.
Currently, physicians see whether a patient has a hardened aorta by recording a pulse from the carotid artery, located in the neck, and the femoral artery, which is located in the groin.
Taking a pulse from the finger or on the arm is easier to record and nearly as accurate, Pierce said. It also works better with obese patients, whose femoral pulse can be difficult to obtain reliably, he added.
"The technique is more effective in that it is easy to obtain just one pulse waveform in the finger or the brachial artery, and it's less intrusive than obtaining a femoral waveform in patients," said Pierce, first author on the paper, published in the American Journal of Physiology Heart and Circulatory Physiology.
"It also can be easily obtained in the clinic during routine exams similar to blood pressure tests," he said. Pierce's instrument measures the speed, called aortic pulse wave velocity, at which the pulse moves between two points.
The UI team validated the new instrument's performance against the carotid-femoral-artery pulse wave velocity tests, considered the gold standard for determining aortic stiffness.
"Finding simple noninvasive methods to measure aortic pulse wave velocity in the clinic may help physicians to better inform middle-aged and older adults about their level of cardiovascular risk," Pierce said.