bloodpressure aliasing
TRANSCRIPT
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DEPARTMENT OF ENGINEERING SCIENCEINSTITUTE OF BIOMEDICAL ENGINEERING
Marco F Pimentel,
Graduate Student,
Centre or Doctoral Trainin! in "ealt#care Inno$ation,
In%titute o Biomedical En!ineerin!,
Uni$er%it& o O'ord
marco()imentel*en!(o'(ac(u
+
Monitorin! Blood Pre%%ure
Biomedical Si!nal Proce%%in!
anuar& -., -/01
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e -
Outline
S#ort #i%tor&
Deinition o Blood Pre%%ure
3#at i% #&)erten%ion4
5ariou% met#od% u%ed or mea%urement% o 6lood)re%%ure
"o7 oten %#ould 7e mea%ure 6lood )re%%ure4
Sam)lin! and Alia%in!
Ne7 re%ource% 8 An O'ord Uni$er%it& Pro9ect
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e :
T#e ir%t to mea%ure BP
0;:: 2 Re$erend Ste)#en"ale% ir%t to mea%ure BP
Mea%ured t#e #ei!#t o acolumn o 6lood ater
cannulatin! t#e carotidarter& in a #or%e 7it# a6ra%% )i)e(
I
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e >
T#e ir%t mea%urement o BP
T#e 6ra%% )i)e 7a%attac#ed to a 0- inc# !la%%tu6e
Tu6e 7a% connected to t#e
)i)e $ia a trac#ea o a!oo%e
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e .
A %econd tr&?
0// &ear% later@ a mercur& manometer connected to t#earter& 7a% u%ed to mea%ure t#e BP
"o7e$er@
Bot# o t#e%e met#od% are invasive
? And ma&6e? a
6it uncomorta6leor t#e )atient=
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e 1
Eure+a=
In late 0/%, an Italian )#&%ician 8 Sci)ione Ri$a Rocciin$ented t#e S)#&!momanometer
Shygmorom t#e Gree+ )ul%e
Manometer )re%%ure meter
2 Con%i%ted o a mercur& columnManometer, a ru66er %lee$e 7#ic#i% illed 7it# air, and a %ueeHe 6a!to inlate t#e ru66er %lee$e I #ad an
idea=
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e ;
No7ada&% BP monitor%
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8/35M F Pimentelanuar& -., -/01
Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e
3#at i% Blood Pre%%ure4
Blood Pre%%ure i% a mea%urement o t#e orce a!ain%t t#e7all% o t#e arterie% a% t#e #eart )um)% 6lood t#rou!#outt#e 6od&
Blood )re%%ure i% mea%ured in mm"! millimeter% omercur&
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e
3#at i% Blood Pre%%ure4
Blood Pre%%ure i% a mea%urement o t#e orce a!ain%t t#e7all% o t#e arterie% a% t#e #eart )um)% 6lood t#rou!#outt#e 6od&
Blood )re%%ure i% mea%ured in mm"! millimeter% omercur&
0,/// Pa i% a6out ; mm"!=
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e 0/
3#at i% Blood Pre%%ure4
T#e 6lood )re%%ure readin! i% ta+en in - num6er%@systolic and diastolic(
Systolic
Diastolic
Mea%ure o
)re%%ure a% t#e
#eart i% 6eatin!
Mea%ure o
)re%%ure 7#ile
t#e #eart i% at re%t
6et7een 6eatin!
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anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e 00
"&)erten%ion
Blood )re%%ure c#an!e% all t#e time@ It decreases7#en 7e %lee), or 7#en 7e are at re%t
It increases7#en 7e are acti$e, e'cited, )racticin! %)ort%,%tre%%ed and ner$ou%
C#an!in!6lood )re%%ure i% a $ital )art o a #ealt#&cardio$a%cular %&%tem
"&)erten%ion, or #i!# 6lood )re%%ure, #a))en% 7#en t#e 6lood)re%%ure stays too high over an extended period of time@
Can cau%e t#e #eart to #a$e to 7or+ too #ard and t#e orce ot#e 6lood lo7 can dama!e &our arterie%, #eart, +idne&%, 6rainand e&e%(
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Pa!e 0-
"&)erten%ion
Know your numbers:
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anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e 0:
"&)erten%ion
Hypertension depends on several factors:
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anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e 0>
"o7 to mea%ure4
In$a%i$e 6lood )re%%ure IBP@
It mea%ure% t#e BP internall& 6& u%in! a %en%iti$e I5cat#eter in%erted into an %u)ericial arter&( T#i% i% t#e)rocedure ta+en 7#ere continuou% BP monitorin! i%reuired(
Non2in$a%i$e 6lood )re%%ure NIBP@
Au%cultation
O%cillometr&
Do))ler determine% t#e lo7 di%tal to t#e arter&
Arterial tonometr&, Arterial $olume clam) are ot#er t&)e% oNIBP mea%ure
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anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e 0.
"o7 to mea%ure4
Non2in$a%i$e 6lood )re%%ure
Au%cultation
O%cillometr&
Mercur& %)#&!momanometer %tet#o%co)e
Mec#anical manometer %tet#o%co)e
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anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e 01
"o7 to mea%ure4
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e 0;
T#e au%cultation met#od
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e 0
T#e au%cultation met#od
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e 0
T#e au%cultation met#od
S&%tolic BP
Dia%tolic BP
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e -/
T#e o%cillometric met#od
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e -0
T#e o%cillometric met#od
It i% 6a%ed on t#ec#an!e o t#ema!nitude oo%cillation
MAP 8 MeanArterial Pre%%ure
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
T#e o%cillometric met#od
It i% 6a%ed on t#ec#an!e o t#ema!nitude oo%cillation
MAP 8 MeanArterial Pre%%ure
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
"o7 oten %#ould 7e mea%ure4
Let% ir%t con%ider an e'am)le?
MA!A" Demo
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
"o7 oten %#ould 7e mea%ure4
3#& i% t#i% im)ortant or 6lood )re%%ure monitorin!4
"o7 muc# doe% &our 6lood )re%%ure $ar& in one da&4
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M F Pimentelanuar& -., -/01
Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
"o7 oten %#ould 7e mea%ure4
3#& i% t#i% im)ortant or 6lood )re%%ure monitorin!4
"o7 muc# doe% &our 6lood )re%%ure $ar& in one da&4
Jot%i% et al( "&)erten%ion, -//.
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
"o7 oten %#ould 7e mea%ure4
Treat
Do not
treat
am
DBP
>am-)m >am
Treatmentt#re%#old
SBP
time
->#r mean
BP
0/)m
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#nder$sampling
anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e --
"o7 oten %#ould 7e mea%ure4
Treat
Do not
treat
am>am-)m
0/)m >amtime
%%
%
Treatmentt#re%#old
->#r mean
BP
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Aliasing effect
anuar& -., -/01Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!
Pa!e --
"o7 oten %#ould 7e mea%ure4
Treat
Do not
treat
am>am-)m
0/)m >am
BP
time
%%
%
Treatmentt#re%#old
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
Under2%am)lin! and alia%in!
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
Sam)lin! and Alia%in!
Under2%am)lin! loo%e%im)ortant 7a$e detail%=
It al%o ma& c#an!e t#e 7a$e ormK%#a)edue toAlia%in!
Samplingi% a di%crete o6%er$ation ormea%urement, 7#ile Aliasingi% an
illu%ion, a))earance o %omet#in! t#at i%not, due to %#ortcomin!% o %am)lin!
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
Ne7 re%ource%
#tt)@KK777(7orldliee')ectanc&(comKcau%e2o2deat#K#&)erten%ionK6&2countr&
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
Lo72co%t BP monitor
#tt)@KKcode(!oo!le(comK)Ke7#26)2)ro9ectK
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
Lo72co%t BP monitor
#tt)@KKcode(!oo!le(comK)Ke7#26)2)ro9ectK
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Blood Pre%%ure 2 Biomedical Si!nal Proce%%in!Pa!e --
A7ard%
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