High or total spinal
Stem
A 27-year-old G1P0 at 40 weeks, 72 kg, had a labor epidural that worked poorly on one side, so it was removed and a spinal with 12 mg of hyperbaric bupivacaine was placed for cesarean delivery. Three minutes later she says she cannot breathe, her voice is a whisper, and she cannot squeeze your hand. Blood pressure is 70/35, heart rate 48, and SpO2 93%.
Question
What is happening, and how do you manage it?
Ideal answer
HeadlineA high spinal until proven otherwise; a spinal after a failed epidural is the classic setup. I call for help, give 100% oxygen, and treat the circulation aggressively.
- Supine, left uterine displacement, airway support: rapid airway control is essential, and reverse Trendelenburg does not limit spread.1
- Ephedrine, atropine or glycopyrrolate, phenylephrine; epinephrine early, in titrated 10–100 mcg doses, because the cardiac accelerator fibers are blocked and she is profoundly hypotensive.
- She cannot phonate: rapid sequence intubation, with a small dose of etomidate or ketamine and succinylcholine or rocuronium.
- Fetal heart rate reflects her perfusion; the cesarean proceeds once she is stable.
- Arrest: ACLS, perimortem delivery at 4 minutes.2 Otherwise recovery is expected: sedation and ventilation until the block recedes.
Breaking down the answer
- Recognize the picture — upper-extremity weakness, dyspnea, difficulty speaking, hypotension and bradycardia right after a neuraxial dose, typically the failed-epidural spinal.
- Why the heart rate matters — accelerator fibers (T1–T4) are blocked, so bradycardia and lost venous return combine; phenylephrine alone is insufficient with bradycardia.
- Intubate on function, not on level — inability to speak, inadequate ventilation, aspiration risk with a full stomach, or loss of consciousness. A high sensory level with good phonation and saturation gets support and reassurance; this is the judgment graded.
- Induction drug — she is sympathectomized: a small dose of etomidate or ketamine, or none if she is unconscious.
- Unconsciousness and apnea — brainstem hypoperfusion as much as direct anesthetic effect; restoring blood pressure often restores breathing. Aortocaval compression makes everything worse.
- Prevention — incremental epidural dosing, aspiration and test dosing of every catheter, and a reduced spinal dose after a failed or partially working epidural.
Follow-up question
As you prepare to induce, she becomes apneic and pulseless. The labor nurse mentions that the failed catheter received a 10 mL bolus of 0.25% bupivacaine just before it was removed. What do you do?
Follow-up answer
HeadlineMaternal cardiac arrest: I declare it, start compressions with manual left uterine displacement, and call the obstetric and neonatal teams.
Epinephrine 1 mg IV at standard nonpregnant doses; intubate and ventilate with 100% oxygen at about 10 breaths per minute, because with a high block respiratory arrest may precede the arrhythmia.2 A one-sided catheter may have been partly intravascular, and the same dose in a vein gives arrest too, so local anesthetic systemic toxicity as well: 20% lipid emulsion 1.5 mL/kg then 0.25 mL/kg/min if any doubt.2 No circulation by 4 minutes: bedside resuscitative hysterotomy, delivery by 5 minutes.2 After return of circulation: sedated and ventilated, catheter dosing reviewed, disclosure.
Pitfalls that cost points
- Treating the blood pressure with phenylephrine alone while the heart rate falls to 40.
- Intubating reflexively because the level is high, without assessing function.
- Failing to mention the unrecognized intrathecal or subdural catheter as the cause.
- A wedge or 30° tilt during CPR: it degrades chest compressions.2
Rapid-fire
Q: Why does a spinal after a failed epidural risk a high block? A: Epidural volume compresses the dural sac and drug can cross the hole, so intrathecal drug spreads further than expected.
Q: How does a subdural block differ? A: It is slow (15–30 minutes), patchy, high and sensory-dominant with relative sparing of sympathetic and motor fibers.
Q: Why give epinephrine early? A: It provides chronotropy, inotropy and vasoconstriction together; the mechanism is profound sympathectomy, and small doses reverse it.
Q: Why does the patient stop breathing with a cervical block? A: The phrenic nerve (C3–C5) is blocked, and brainstem hypoperfusion depresses the respiratory center.
Numbers to know
| Item | Value |
|---|---|
| Cardiac accelerator fibers | T1–T4 |
| Phrenic nerve | C3–C5 |
| Epinephrine for collapse | 10–100 mcg IV titrated; 1 mg in arrest |
| Perimortem delivery | Incision at 4 min, delivery by 5 min2 |
| Uterine displacement | Manual left displacement preferred; 30° tilt impairs compressions2 |
Links
- Spinal anesthesia: dosing, spread, hypotension, Epidural anesthesia and the test dose, Maternal cardiac arrest and resuscitative hysterotomy, Local anesthetic systemic toxicity, ACLS adapted to the operating room
- ASA Practice Guidelines for Obstetric Anesthesia; SOAP consensus statement on the management of cardiac arrest in pregnancy
Sources
- 1.Obstetric Regional Anesthesia · NYSORA · nysora.com
- 2.SOAP Consensus Statement on the Management of Cardiac Arrest in Pregnancy · SOAP (Lipman et al., Anesth Analg), 2014 · soap.org
Facts on this page were checked against these sources on Oct 14, 2026. Guidelines change; confirm doses against current institutional protocols.