Phrenic nerve stimulation: the Australian experience

Area of Science:

• Medical Devices
• Respiratory Medicine
• Neurology

Background:

• Phrenic nerve stimulation (PNS) involves using a nerve stimulator to induce diaphragmatic contraction.
• Common indications for PNS include central alveolar hypoventilation and high quadriplegia.
• This study reviews data from 19 patients who underwent PNS in Australia.

Observation:

• The patient cohort included 14 individuals with quadriplegia, one with congenital central hypoventilation syndrome, and one with brainstem encephalitis.
• Eleven phrenic nerve pacers remain actively implanted, with durations ranging from 1 to 21 years (mean 13 years).
• Eight patients required revision surgeries, with four upgrading from the older I-107 system to the newer I-110 system.

Findings:

• The I-110 system is designed for lifelong electrical performance, unlike the previous I-107 system.
• Mechanical failures necessitated revisions in three patients.
• The data indicate successful long-term respiratory support via phrenic nerve stimulation.

Implications:

• Phrenic nerve stimulation demonstrates potential as a long-term alternative to mechanical ventilators for respiratory support.
• This technique can significantly improve quality of life for patients with severe respiratory compromise.
• Further research into system longevity and patient outcomes is warranted.