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APGWhat is APG?
- It is called `Photoplethysmograph` corrugating with the wave form signal that indicates pulsation of chest wall and great arteries followed by heart beat. Pulse waveforms made by the status of vessels or circulation are not stable and hard to find the turning points. Therefore, it is necessary to assess by Accelerated Photoplethysmograph which is the second differentiation of PTG.
APGIs it possible to figure out the symptom of arteriosclerosis with the result measured by the finger probe?
- When the pressure fluctuation from the aorta by the pulsation of heart transmits its influence to the peripheral nerve, it appears the change in the blood volume at the finger tip. It is reported that the central pulse waves have the similar ones from the peripheral nerve and aorta. By the disease, the pulse waves are changing continuously. In particular, it is very big change in age. With this device, it is not possible to confirm the specific symptom of arteriosclerosis but it is available specially to detect the peripheral blood circulation disorder.
APGWhat are the clinical applications of APG?
- Assess the peripheral blood circulation disorder
  Evaluate the process and prediction of arteriosclerosis
  Cardiovascular disease such as Myocardial Infarction
  Indicator of general health
APGHow can we measure the APG?
- Near infrared ray is easy to penetrate the human tissues and to absorb the oxidized hemoglobin in the blood. Therefore, there are two measuring methods like reflex way that detects the reflex lights and transmission way that detects the transmissible lights. With our device, we use the transmission method to detect the extinction volume of infrared rays at the finger tip. It is called `Photoplethysmograph` which can be measured for the volume level of blood in the vessel.
HRVWhat is HRV?
- The HRV, heart rate variability is the degree of fluctuation in the length of the intervals between heart beats. Heart rate is determined by S-A node and ANS function. ANS function (SNS and PNS) leads to change heart rate continuously under the influence of internal/ external environmental changes. Healthy person has highly complexity of HRV while unhealthy individual with stress and disease has lowered complexity of HRV.
HRVIt is said that irregular heart rate means healthy and regular heart rate means unhealthy. Why?
- In the past, it had been believed that normal heart rate should be regular keeping the static or lasting state of equilibrium since the concept of homeostasis was first introduced to medical academic world in 1929. But it turned out that - with the development of bio-signal processing technology- the bio-signals are constantly and minutely changes even in a state of equilibrium. That is to say, 'normal resting heart rate is highly irregular'. Normal and healthy ANS(Autonomic Nervous System) copes with the environmental changes rapidly and properly, thus HRV increases while if the ANS function is lowered or improper, which indicates lowered HRV.
HRVAre the heart controlled by ANS?
- The heart is representative organ controlled by both sympathetic and parasympathetic nervous system together. ANS's function and balance can be assessed and evaluated by measuring heart rate variability, the window of the ANS.
HRVHow do we know the balance of ANS?
- There are two methods to analyze the HRV measure, time domain analysis and frequency domain analysis. Frequency domain analysis method is related to the balance between SNS and PNS by filtering and analyzing the power of each frequency waves from tachogram.
HRVWhat is the clinical value of HRV?
- (1) Coping ability with disease
  (2) Prediction about adequate recovery
  (3) Warning and preparation related chronic disease
  (4) Choice of drug and dose
  (5) Evaluation of prognosis and treatment results
  (6) Keep fit and quality evaluation
HRVWhat are the precautions for measurement?
- The user should measure with his/her eyes open and should not move or talk during the measurement.
  The device will work normally when the left index finger is inserted deep into the device’s holder.
  After exercising, do not measure right away but relax for approximately 10 minutes.
  Breathe normally and do not take deep breaths.
  Put the device on the table to take a stable measurement since we recommended locating the index finger in the device at the same position over the heart.
  Measurement results for people with Arrhythmia or Cardiac disease (who use pacemaker) cannot be trusted.
  Measuring in the morning is desirable. The results will not be accurate if the person being tested has been drinking coffee, smoking a cigarette, or has taken medications within 3 hours before the measurement.
  If left index finger is manicured, the manicure on the nail should be removed before measuring. (Light Absorption errors occur causing the measurement result to be inaccurate.)