Learned physicians will agree, BP recording by classical auscultatory method is not always an easy task !
Such an important clinical sign is left to the whims and fancies of human ear’s ability to detect of low pitched vibrations emanating from deep seated brachial artery .(5 phases of Korotkoff )
Since Korotkoff sounds are low frequency sounds , it is best heard with bell of the stethoscope ? How many of us do it ?
There is little surprise , two BP recordings rarely match even if it’s performed minutes apart !
While phase one is easily identified , the gap between phase 4 and 5 can be very narrow and differentiating them is often an auditory illusion.
Korotkoff sounds is subjected to severe tissue plane damping esepcailly in low flow states and obese arms.
So is there an alternative method to measure diastolic BP ?
Most will agree , systolic BP can be well measured by palpation ,
What about diastolic BP ?
In this technological era , it may appear foolish to depend on a tactile measurement . But as these articles suggest , it is worth a try!
In certain population we know the kortokoff sounds are low quality .Auditory interference can be more than tactile sensation. In those hands ,Korotokoff equivalents can be felt by sensitive fingers.
How does automated BP recorders sense systolic and diastolic BP ?
Does it sense the sound or feel the vibrations.