Sana couch 250 L and Sana cardio 250 SE
Article no.: 2.520027 Rev.:e
Page 14 of 26
6. Initial
Operation
6.1
Blood Pressure Measuring Unit (250 SE)
In order to conduct exercise testing correctly, it is of utmost importance to measure physical performance
data and data from the ECG measurement as well as simultaneously measuring and recording blood
pressure data to determine the reaction of the circulatory system to increased exertion.
For this purpose, ergosana has developed an extremely accurate blood pressure measuring system that is
not susceptible to interference. It has been integrated into this ergometer and uses a so-called indirect
method of blood pressure measurement. The Korotkoff sound, which is created by the air being forced out
of the cuff as blood flows through the area of compression, is recorded along with several other important
parameters of critical importance to attain accurate measurement. These measurements are evaluated in
milliseconds by an internal digital evaluation system and shown in the ergometer's display as systole and
diastole. The pulse rate is also determined during measurement and likewise shown in the display. At the
same time as they are shown in the display, the measurements can also be transferred to a peripheral
device such as an ECG or pulmonary function unit for evaluation and recording over an RS-232 interface.
The blood pressure cuff is the measurement sensor for blood pressure. Despite the perfectly functioning
measuring system, it remains critically important that the cuff is placed on the arm correctly and carefully.
According to international agreement, the blood pressure should be measured on the left arm, which is
near the heart, as the flow impedance level is lowest there. An exception to this rule is formed by approx.
1 to 2 per cent of test persons on whom the Korotkoff sound cannot be measured due to vascular
phenomena. The cuff is placed on the right arm of such patients.
An armrest is attached to the ergometer for the arm on which the blood pressure is measured. The
armrest provides the arm's stable position to prevent distortion of the result caused by artefacts. It must
be set up to support the arm in a slightly angled position. It can be mounted on the right or the left side.
Please note that the cuff’s air tube must be fixed in a way that prevents it from encumbering the
ergometer. This is to prevent unnecessary artefacts that might affect the measurement's accuracy.
