fMRI studies evaluating central respiratory control in humans.

Area of Science:

• Neuroscience
• Respiratory Physiology

Background:

• The central nervous system (CNS) governs fundamental respiratory patterns via neural centers.
• These centers utilize pacemaker neurons and chemical control, responding to O2/CO2 balance changes.
• Brainstem respiratory centers are challenging to localize via MRI due to small size and physiological noise.

Purpose of the Study:

• To provide a comprehensive overview of human central respiratory control.
• To review studies investigating respiratory responses to various stimuli.
• To highlight methodologies for studying respiratory control despite imaging limitations.

Main Methods:

• Review of existing literature on human central respiratory control.
• Analysis of studies employing stimuli like CO2 inhalation, hypercapnia, apnea, and hypoxia.
• Discussion of functional MRI (fMRI) challenges and alternative approaches.

Main Results:

• Identified key neural centers in the brainstem responsible for respiratory pattern generation.
• Summarized responses of respiratory centers to chemical and volitional challenges.
• Detailed the difficulties in imaging these centers using fMRI.

Conclusions:

• Central respiratory control is complex, involving multiple neural networks.
• Despite technical challenges, various methods allow study of respiratory control.
• Further research is needed to fully elucidate brainstem respiratory mechanisms.