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2. Total Spinal AnesthesiaFollowing Subarachnoid Injection of Local Anesthetic for Cesarean Section(Two Case Reports) Dmitry Portnoy, MD
3. Case # 1. Preoperative Assessment 21 y/o, G1, at 41 weeks induced for postdates, suspected chorioamnionitis.
No previous medical or surgical history.
System review was unrevealing, NKDA
PE unremarkable, Wt-76 kg, Ht-53
VS: BP-99/54, HR-82, RR-20, low FHR baseline
AW: MP-I, TMD - 6 cm, neck - FROM, mouth opening - 4.5 cm.
4. Timeline 1740 Active labor, Cx - 7 cm. CSE immediate pain relief.
2025 LEA activated after negative standard test dose.
0145 Called for c/s(failure to descend); Pump off; Pt reported some right-sided pain. LEC pulled back 1 cm.
0155 LEA activated with total of 15 cc of 3% chloroprocaine. Sensory block remains considerably inadequate on right side.
0210 To OR; LEC removed intact; SAH done at L2-L3, sitting with 1.2 cc(9,0 mg) of 0.75% Bup + 25 mcg Fentanyl + Epi
0214 Total spinal developed. EZ ventilation with cricoid pressure. Uneventful tracheal intubation following 250 mg of STP.
0234 Baby delivered without incident with Apgar 8 and 9.
0310 Extubated awake, in full strength, with airway reflexes intact.
0320 To PACU, VSS, sensory block at T3.
POD # 2 Discharged home in good condition.
6. Spinal Following Epidural Controversy J.H.Waters compared epidural/spinal and spinal alone ( Anesthesia and Analgesia,1994;78:1029-35).
Similar sensory level in both groups
20% less dose and volume in epidural/spinal group
high spinal in 1 of 17 in epidural/spinal group
spinal anesthesia can be performed safely after inadequate epidural anesthetic
7. Spinal Following Epidural Controversy T.Adams reported 61 cases of failed epidurals converted to spinal anesthesia(Anesth Analg1995;81:654-6)
Standard dose of 0.75% hyperbaric bupivacaine used
No high block or other complications noted
Kestin IG. Spinal anaesthesia in obstetrics. ( British Journal of Anaesthesia 1991;66:596-607)
spinal technique may be used if an extradural block is inadequate after giving the maximum dose of local anesthetic
8. Spinal Following Epidural Recommendations Caution is required in the presence of any fluid in extradural space( volume and time dependant).
Reduction of spinal anesthetic dose/volume by 20%.
Special considerations for patients with suspected difficult airway
All patients who undergo RA warrant precautions for possible need of general anesthesia
Catheter based intermittent technique
Elective secure of the airway
9. Case # 2. Preoperative Assessment
11. Factors Influencing Distribution of Local Anesthetic Solutions (based on Dr. N. Greens review) Patient characteristics
Technique of injection
Characteristics of spinal fluids
Characteristics of anesthetic solution
12. Patient characteristics Age
Anatomical configuration of spinal column
13. Technique of injection Site of injection
Direction of needle
Direction of bevel
Rate of injection
14. Characteristics of anesthetic solution Density ( vs specific gravity vs baricity)
Amount of anesthetic
Concentration of anesthetic
Volume of injected anesthetic
Presence of vasoconstrictors
15. Characteristics of spinal fluids Composition
16. Factors of great clinical significance
Baricity of anesthetic solution.
The dosage of anesthetic solution.
The position of the patient (with hypo- or hyperbaric solutions)
17. Demonstrable factors of varying clinical significance Patient age
Anatomical configuration of spinal column
The direction of the needle during injection
The volume and density of CSF
The volume of anesthetic solution
18. Dosage of Spinal Anesthetic and Patients Variables in the Term Parturient Isobaric versus hyperbaric solutions.
Standard versus variable dosage.
No evidence that one way is better than another.
No golden standard dose is known: dosages from 7.5 mg to 15.0 mg were successfully used.
19. Dosage of Spinal Anesthetic and Patients Variables in the Term Parturient(Dr. Ezzat I.Abouleish table)
20. Dosage of Spinal Anesthetic and Patients Variables in the Term Parturient Dr. R.Vadheras recommendations for spinal hyperbaric bupivacaine injections:
21. Dosage of Spinal Anesthetic and Patients Variables in the Term Parturient Mark C. Norris, M.D., Anesthesiology 72:478-482,1990
22. Dosage of Spinal Anesthetic and Patients Variables in the Term Parturient Mark Norris, M.D., Anesth Analg, 1988;67:555-8
50 term parturients
12 mg of hyperbaric bupivacaine
Lateral decubitus position
23. Dosage of Spinal Anesthetic and Patients Variables in the Term ParturientDr. M. Norris study conclusion Patients Variables:
Age (20 42)
Height (146 175 cm / 411 60)
Weight (55 136 kg)
Body mass index (19 50 kg/m2)
Did not correlate with the spread of sensory blockade
It is not necessary to vary the dose of injected hyperbaric bupivacaine
24. Vertebral Column Length Variability and Spread of Hyperbaric Spinal Anesthetic B.Hartwell study significant correlation exist M. Norris study no clinically significant correlation
25. General Recommendations The incidence of high spinal block in obstetric anesthesia is probably higher.
Careful monitoring of sensory level is advisable, particularly in patients with extreme variables.
Be fully prepare to manage airway of any patient that undergo spinal anesthesia.
Take special consideration for patients with potential difficult airway.