Spontaneous breathing: a double-edged sword to handle with care

Area of Science:

• Critical Care Medicine
• Pulmonary Physiology
• Respiratory Therapy

Background:

• Spontaneous breathing in acute hypoxemic respiratory failure (AHRF) and acute respiratory distress syndrome (ARDS) offers physiological benefits, including preventing muscle atrophy and reducing sedation needs.
• However, uncontrolled inspiratory effort during spontaneous ventilation can exacerbate lung injury, lead to diaphragm dysfunction, and prolong weaning.

Purpose of the Study:

• To review the physiological mechanisms of spontaneous breathing in AHRF and ARDS.
• To emphasize respiratory monitoring for lung protection during spontaneous assisted ventilation.
• To describe the benefits and risks of spontaneous ventilation and propose clinical strategies for protective spontaneous breathing.

Main Methods:

• Review of physiological mechanisms driving spontaneous breathing.
• Emphasis on basic and advanced respiratory monitoring techniques.
• Description of benefits, risks, and clinical interventions for spontaneous ventilation.

Main Results:

• Early switch to spontaneous assisted breathing respects physiology and may offer advantages in AHRF.
• Spontaneous breathing can still pose a risk of additional lung injury.
• Routine monitoring of tidal volume (Vt) and driving transpulmonary pressure is recommended.

Conclusions:

• Spontaneous assisted breathing in AHRF is physiologically advantageous but requires careful monitoring.
• Interventions like extracorporeal CO2 removal can help maintain safe inspiratory effort and pressures.
• Further research is needed to assess the long-term efficacy of these interventions.