Monitoring & CPR · NEET PG Preparation Anaesthesia
Which of the following pulse oximetry phenomena is based on the principle that the pulsatile component (AC) of light absorption corresponds to arteri…
Practice question from Monitoring & CPR (NEET PG Preparation Anaesthesia), with the correct answer and a step-by-step solution.
hard · MCQ · Q-7358E1
Which of the following pulse oximetry phenomena is based on the principle that the pulsatile component (AC) of light absorption corresponds to arterial blood, while the non-pulsatile component (DC) corresponds to tissue, skin, and venous blood?
- A.Beer-Lambert LawCorrect answer
- B.Fourier transformation
- C.Plethysmography
- D.See-saw effect
Solution
Pulse oximetry relies on the Beer-Lambert law of light absorption, utilizing two wavelengths of light (660 nm and 940 nm) to differentiate oxygenated hemoglobin from deoxygenated hemoglobin by analyzing the AC (pulsatile arterial) to DC (non-pulsatile tissue/venous) ratios.
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