CLINICAL AND EXPERIMENTAL OBSERVATIONS UPON CHEYNE-STOKES RESPIRATION

Area of Science:

• Neurology
• Cardiology
• Respiratory Medicine

Background:

• Cheyne-Stokes respiration (CSR) is a complex breathing pattern.
• Previous understanding suggested a single cause for CSR.
• The relationship between CSR, blood pressure, and intracranial pressure requires further elucidation.

Purpose of the Study:

• To investigate the association between Cheyne-Stokes respiration and blood pressure variations.
• To differentiate clinical presentations of CSR based on these associations.
• To explore the role of intracranial pressure in experimentally induced periodic breathing.

Main Methods:

• Clinical observation of ten patients with Cheyne-Stokes respiration, correlating respiratory patterns with blood pressure waves (Traube-Hering waves).
• Experimental induction of periodic respirations via cerebral compression in animal models.
• Analysis of the relationship between blood pressure, intracranial tension, and respiratory center activity.

Main Results:

• Two distinct clinical groups of CSR were identified based on the correlation between respiratory activity/apnea and blood pressure rise/fall.
• Experimental cerebral compression mimicked CSR, demonstrating a direct link between intracranial pressure, blood pressure fluctuations, and periodic breathing.
• The study confirmed that blood pressure waves are not a mechanical consequence of CSR but rather a contributing factor or share a common cause.

Conclusions:

• Cheyne-Stokes respiration can manifest in at least two distinct clinical patterns, differentiated by blood pressure wave correlations.
• Increased intracranial tension is a significant factor in CSR, directly influencing periodic breathing through medullary center activity.
• The findings suggest a causal link between blood pressure dynamics, medullary center function (respiratory, vasomotor, cardio-inhibitory), and the development of Cheyne-Stokes respiration.