80-0067-00-MO-RevF 2017-10-03 SunTech CT40 User Manual | 24
6. Using SunTech CT40 for Heart Rate Measurement
There are two ways to measure heart rate with the SunTech CT40.
BP Heart Rate Measurement
With this method, HR is captured automatically during BP measurement.
SpO
2
Heart Rate Measurement
If you have the optional pulse oximetry module on your device, you can measure HR through the SpO
2
sensor. See
next section (section 7) for more on use of this option.
The SunTech CT40 uses BP as the default HR source. HR source can be selected using the Advanced Configuration
Application.
7. Using SunTech CT40 for Pulse Oximetry
An optional SpO
2
module allows you to measure the oxygen saturation of arterial bloodflow and display the reading
on the SunTech CT40. There are two different types of optional SpO
2
modules: Masimo
®
SET
®
and ChipOx.
General Principle of Operation:
The pulse oximeter directs red and infrared light into a capillary bed and measures the change in light absorption
during the pulsatile cycle. Red and infrared light-emitting diodes (LEDs) in oximetry sensors serve as the light
sources, and a photodiode serves as the photo detector.
Traditional pulse oximetry assumes that all pulsations in the light absorbance signal are caused by oscillations in the
arterial blood volume.
The traditional pulse oximeter calculates the ratio of pulsatile absorbance (AC) to the mean absorbance (DC) at each
of two wavelengths (typically one visible, the other infrared). The oximeter then calculates the ratio of these two
arterial absorbance signals. This value is used to find the saturation SpO
2
in a standard table built into the oximeter
software. The values in the table are based upon human blood studies against a laboratory co-oximeter on healthy
adult volunteers in induced hypoxia studies. The resulting value is reported as oxygen saturation level (%).
WARNING:
Pulse oximeter probes and sensors are designed for use with specific pulse oximeter devices. Only use
probes and extension/adapter cables that are specified for each SpO
2
module.
WARNING:
The responsible organization and/or operator must verify the compatibility of the oximeter, oximeter
probe, and extension/adapter cable before use. Otherwise, patient injury can result.
WARNING:
Misapplication of a pulse oximeter probe with excessive pressure for prolonged periods can induce
pressure injury.
