Spinal anesthesia should only be undertaken by or under the supervision of clinicians with the necessary knowledge and experience. Resuscitative equipment and drugs must be immediately available whenever the drugs are used. The anesthetist must remain in constant attendance until the operation is finished and must supervise the recovery until the anesthesia has worn off.
Regardless of the local anesthetic used hypotension and bradycardia may occur. This should be prevented by pre-loading the circulation with crystalloidal or colloidal solutions, or treated promptly with for example, ephedrine 5-10 mg IV, and repeated as necessary.
Spinal anesthesia can be unpredictable and very high blockades are sometimes encountered with paralysis of intercostals muscles, especially in pregnancy.
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