A New Methodology for Intraoperative Monitoring of the Functional Integrity of the Phrenic Nerve During Cardiothoracic Surgery.

INTRODUCTION: The phrenic nerve could be easily injured during cardiothoracic surgeries because of its anatomical relationships. The aim of this study is to describe a new, feasible, and reproducible methodology to achieve a continuous intraoperative neuromonitoring of the phrenic nerve. METHODS: Consecutive patients who underwent open-chest surgery were included. The recording active electrode was placed 5 cm superior to the tip of the xiphoid process, and a hook wire inserted at the motor point of the ipsilateral hemidiaphragm was used as the reference electrode. RESULTS: We studied 45 patients (92% men, mean age 67 years). Mean height and weight were 167 ± 6.9 cm and 75.6 ± 12.3 kg, respectively. A reproducible compound motor action potential was recorded in 38 (85%) subjects. The mean latency and amplitude values were 9.68 ± 2.40 ms and 1.36 ± 3.83 mV, respectively. No intraoperative events were recorded. CONCLUSIONS: We reported a new methodology which allows the assessment of phrenic nerve functional integrity during surgical procedures.

Neuropatía frénica en pacientes con accesos venosos centrales cervicales. Estudio prospectivo en pacientes ingresados en una unidad de cuidados intensivos / Phrenic neuropathy in patients with cervical central vein catheterizations. A prospective study in patients admitted in an Intensive Care Unit

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