During Cheyne-Stokes respirations, pulse oximetry typically shows which pattern?

During Cheyne-Stokes respirations, pulse oximetry typically shows which pattern?

• A. A wave-like pattern rising during the apneic period and falling after rapid respiration
• B. Flat line
• C. Monotonic increase
• D. Random fluctuations

Answer: (A)

Cheyne-Stokes breathing creates cycles of waxing and waning ventilation with brief pauses (apneas). Because ventilation repeats in a cyclical way, pulse oximetry shows a repeating, wave-like pattern in oxygen saturation that tracks the breathing cycle. As the apnea occurs, oxygen saturation tends to fall since there’s little or no fresh air exchange; when breathing resumes and tidal volume increases, SpO2 rises again, often overshooting before the next apnea. This cyclic desaturation and re-saturation produce the characteristic waves on the oximeter. The other patterns—flat line, monotonic increase, or random fluctuations—don’t align with the regular, cyclical nature of Cheyne-Stokes respiration.

Cheyne-Stokes breathing creates cycles of waxing and waning ventilation with brief pauses (apneas). Because ventilation repeats in a cyclical way, pulse oximetry shows a repeating, wave-like pattern in oxygen saturation that tracks the breathing cycle. As the apnea occurs, oxygen saturation tends to fall since there’s little or no fresh air exchange; when breathing resumes and tidal volume increases, SpO2 rises again, often overshooting before the next apnea. This cyclic desaturation and re-saturation produce the characteristic waves on the oximeter. The other patterns—flat line, monotonic increase, or random fluctuations—don’t align with the regular, cyclical nature of Cheyne-Stokes respiration.