Photoplethysmographic blood presure measurement/ Department of Physiology 1
Photoplethysmographic
blood presure measurement
Peňáz´s method,
volume-clamp
method
Photoplethysmographic blood presure measurement/ Department of Physiology 2
Principle of continual blood pressure
measurement
Arterial lumen
(finger volume)
Pressure
in the cuff
Control
systemConstant finger volume
pressure
Before application of
control system
Control system:
Correction of the
pressure in the finger
cuff according to the
arterial lumen changes.
Aim: maintaining of
constant arterial lumen
through pressure
changes in the cuff.
application of control system
cuff
Photoplethysmographic blood presure measurement/ Department of Physiology 3
SBP
DBP
150/90
127/92
Photoplethysmographic blood presure measurement/ Department of Physiology 4
Extrasystoles
supraventricular ventricular
Photoplethysmographic blood presure measurement/ Department of Physiology 5
Orthostatic hypotension
6
Valsalva manoeuvre
7
Baroreflex sensitivity, BRS
RR interval
BRS:
slope
RR
SBP
R
ECG
HR
BRSf:
slope
SBP
SBP
Blood
pressure DBP
BRS: change of cardiac
cycle caused by SBP
change by 1 mmHg
[ms/mmHg]
Evaluation of cardiac
baroreflex function
through SBP and
heart rate (cardiac
cycle) changes
8
Evaluation of BRS
Standard(oxford) method:
- Application of phenylephrine
(vasoconstrictor)
decreased BRS
• Physiologically
• stress
• exercise
• Pathologically
• hypertension
• diabetes
• Heart failure
• Myocardial infarction
normal
BRSRR
STK
RR
STK
decreased
BRS