Cheyne stokes breathing at high altitude: a helpful response or a troublemaker?

Area of Science:

• Physiology
• Altitude Medicine
• Sleep Science

Background:

• Sleep disorders are prevalent at high altitudes.
• Periodic breathing (PB) is a common symptom, linked to ventilation control imbalances.
• High altitude exacerbates PB due to hyperventilation-hypoxia phase shifts.

Purpose of the Study:

• To explain the mechanisms triggering periodic breathing at high altitude.
• To evaluate the advantages and disadvantages of PB for individuals at high altitude.

Main Methods:

• Review of physiological mechanisms of ventilation control.
• Analysis of the impact of altitude on periodic breathing.
• Discussion of acclimatization strategies.

Main Results:

• PB may stabilize oxygen saturation up to 3,000-3,500m.
• Above 3,500m, PB leads to sleep deprivation and impairment due to frequent arousals.
• Effective acclimatization and altitude profiles minimize PB but do not eliminate it at extreme altitudes.

Conclusions:

• Periodic breathing presents a dual effect at altitude, beneficial at moderate levels but detrimental at higher elevations.
• Minimizing PB through acclimatization is crucial for optimizing sleep and mitigating adverse effects.
• While strategies can reduce PB, complete elimination remains challenging, especially at extreme altitudes.