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In medicine, pulsus bisferiens, also bisferious pulse or biphasic pulse, is a sign where, on palpation of the pulse, a double peak per cardiac cycle can be appreciated. Bisferious means striking twice. Classically, it is detected when aortic insufficiency exists in association with aortic stenosis, but may also be found in isolated but severe aortic insufficiency, and hypertrophic obstructive cardiomyopathy.

it can be best palpated in big arteries like brachial and carotid. The first lift is due to “percussion wave”(P) and the second lift is due to tidal wave (T).
If P>T - AR>AS

 if T>P - AS>AR

See also

• Hypertrophic cardiomyopathy

External links

• Bisferious pulse - Dorland’s Medical Dictionary
• Bisferious - Dictionary.com