Time course of the effects of cervical epidural anesthesia on pulmonary function
| Autor: | Kere Frey, Taqdees Sheikh, Mauricio Morales, Rom A. Stevens, Tzu-Cheg Kao, Marianne Mikat-Stevens |
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| Rok vydání: | 1998 |
| Předmět: |
Adult
Anesthesia Epidural Male medicine.medical_specialty Vital capacity Lidocaine Nerve root Vital Capacity Pulmonary function testing FEV1/FVC ratio Forced Expiratory Volume medicine Humans Lung Phrenic nerve Aged business.industry General Medicine Middle Aged Surgery medicine.anatomical_structure Anesthesiology and Pain Medicine Dermatome Anesthesia Female business medicine.drug |
| Zdroj: | Regional anesthesia and pain medicine. 23(1) |
| ISSN: | 1098-7339 |
| Popis: | Background and Objectives During cervical epidural anesthesia the C4, C5, and sometimes C3 nerve roots are anesthetized. One might therefore expect pulmonary compromise due to the block of the phrenic nerve if anesthesia extends to C3. This study was conducted to measure the effects of cervical epidural anesthesia using 2% lidocaine on pulmonary function, with specific attention given to the time course of pulmonary changes in relation to spread of analgesia. Methods Fifteen adult patients without preexisting lung disease undergoing carotid endarterectomy, breast surgery, or cervical epidural steroid injection were enrolled. Cervical epidural anesthesia was performed at the C7-T1 interspace using 300 mg lidocaine with epinephrine. Pulmonary function, including forced expiratory volume in one second (FEV1), forced vital capacity (FVC), maximum inspiratory pressure (MIP), and SpO2 while breathing room air were measured prior to and 5, 10, 20, and 40 minutes after lidocaine injection. Results Analgesia to pinprick reached median dermatomes of C3 to T8 (range: C2-T12) by 20 minutes after lidocaine injection. FEV1 and FVC decreased approximately 12-16% between 20 and 40 minutes after injection. Maximum inspiratory pressure and SpO2 did not significantly change. Conclusions Cervical epidural anesthesia using 300 mg lidocaine results in measurable reduction in bedside pulmonary functions concomitant with the spread of analgesia to the C3 dermatome. These changes were complete 20 minutes after lidocaine injection. In patients without preexisting lung disease, these changes were not clinically significant, except in one patient. We conclude that motor block of the phrenic nerve is incomplete under the conditions of this study. |
| Databáze: | OpenAIRE |
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