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Table 1 Section information and physical meaning for each section

From: Feasibility study for the non-invasive blood pressure estimation based on ppg morphology: normotensive subject study

Section

1st derivative

2nd derivative

Blood volume

Rate of bold volume change

Dominant pressure

Sub-dominant pressure

Remarks

PPi

Positive

Positive

Increase

Increase (faster)

Pi

–

Early-systole

PNi

 

Negative

 

Decrease (slower)

Pi

Pm

Late-systole

NNi

Negative

Negative

Decrease

Decrease (slower)

Pm

–

Early-diastole

NPi

 

Positive

 

Increase (faster)

Pm

Po

Late-diastole

PPr

Positive

Positive

Increase

Increase (faster)

Po

–

Early-reflection

PNr

 

Negative

 

Decrease (slower)

Po

Pm

 

NNr

Negative

Negative

Decrease

Decrease (slower)

Pm

–

Late-reflection

NPr

 

Positive

 

Increase (faster)

Pm

Po

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