Bilateral diaphragmatic paralysis with hypercapnic respiratory failure. A physiologic assessment

Area of Science:

• Respiratory Medicine
• Physiology

Background:

• Hypercapnic respiratory failure can indicate underlying respiratory muscle dysfunction.
• Diaphragmatic paralysis is a critical condition affecting breathing mechanics.

Observation:

• A patient with suspected bilateral diaphragmatic paralysis presented with inward abdominal movement during inspiration (abdominal paradox) when supine.
• This paradoxic motion was less apparent when the patient was in an upright posture.

Findings:

• Transdiaphragmatic pressure measurements confirmed diaphragmatic paralysis.
• Magnetometry revealed abdominal paradox throughout breathing in the supine position and during the latter half of inspiration when upright.
• Passive tension in the paralyzed diaphragm near residual volume can mimic active contraction.

Implications:

• Transdiaphragmatic pressure and magnetometry are valuable tools for quantifying diaphragmatic function.
• Clinicians should be aware that abdominal paradox may be masked in the upright position.
• Accurate diagnosis of diaphragmatic paralysis is crucial for appropriate management of respiratory failure.