General Anesthesia Versus Spinal Anesthesia in Patients of HELLP Syndrome

Assiut University60 enrolled

Overview

Anesthesia for caesarian section in patients with HELLP syndrome is a challenge. Measures should be taken during caesarian delivery to guard against the maternal and fetal complications associated with HELLP syndrome.

The choice of anesthesia for caesarian section in parturient with HELLP syndrome is a debate. The low platelet count, associated with HELLP syndrome, has often favored the choice of general anesthesia for the caesarian delivery of these parturient. However, general anesthesia in such cases; is not a risk-free approach. General anesthesia is associated with increased risk of difficult airways, stress response to intubation and aspiration. It is also thought to have an effect on the fetus with the potential placental transfer of inhalational anesthetics prior to delivery. Regional anesthesia is widely regarded as a means of providing analgesia for cesarean section.it also avoids the above-mentioned risks associated with general anesthesia. Regional anesthesia for caesarian section in patients with HELLP syndrome has been used by some researchers in many centers with encouraging results. The lowest platelet count at which one can safely administer neuraxial anesthesia for labour and delivery is controversial. Published studies are few and sample sizes small. Criteria developed at the University of Mississippi, as of 2006: "For a patient to merit a diagnosis of HELLP syndrome, class 1 requires severe thrombocytopenia (platelets ≤50,000/μl), evidence of hepatic dysfunction (AST and/or ALT ≥70 IU/l), and evidence suggestive of hemolysis (total serum LDH ≥600 IU/l); class 2 requires similar criteria except thrombocytopenia is moderate (\>50,000 to ≤100,000/μl); and class 3 includes patients with mild thrombocytopenia (platelets \>100,000 but ≤150,000/μl), mild hepatic dysfunction (AST and/or ALT ≥40 IU/l), and hemolysis (total serum LDH ≥600 IU/L). The researchers chose to investigate class 2 HELLP syndrome as class 3 proved to be safe with regional anesthesia while class 1 seemed to be high risk and un-ethical to do spinal anesthesia with very low platelets count with lack of any evidence to its safety.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Enrollment

Conditions

HELLP Syndrome

Interventions

Spinal AnesthesiaPROCEDURE

Spinal needle 25G with Quincke's bevel will be used. It will be induced with a total of 10 mg of 0.5% hyperbaric bupivacaine and 20 mcg fentanyl (total volume 2.4 ml) at the L3-4 interspace. The parturient will be returned to the supine position with a left lateral tilt of 15° to facilitate left uterine displacement. The upper sensory block level will be checked 5 min after the spinal injection by assessing the loss of cold sensation from alcohol swabs, to ensure that a Th6 sensory block level has been achieved.

General AnesthesiaPROCEDURE

Pre-oxygenation with oxygen 100% via a tight fitting mask rapid sequence technique. Induction is by thiopental (5 mg kg lean body weight) and succinylcholine1.5 mg kg body weight), cricoid pressure should be applied before consciousness is lost and kept in place until confirmation of tracheal intubation with capnography and the cuff of the tracheal tube is inflated. Auscultating the chest helps exclude endobronchial intubation. At this point, surgery may commence.

Eligibility

Sex: FEMALEMin age: 18 YearsMax age: 45 Years

Medical Language ↔ Plain English

Inclusion Criteria: Patients with class (II) (12) HELLP syndrome scheduled for elective caesarian section: Diagnosis of HELLP syndrome was based on the clinical diagnosis of preeclampsia and the following laboratory abnormalities (13): 1. Hemolysis: characteristic peripheral blood smear, serum lactic dehydrogenase (LDH) ≥ 600 U/ l, total bilirubin ≥ 1.2 mg /dl, decreased hemoglobin and hematocrit. 2. Elevated liver enzymes, defined as aspartate aminotransferase (AST). ≥ 70 U/ l, alanin aminotransferase (ALT) ≥ 50 U/ l and lactate dehydrogenase (LDH) ≥ 600 U/ l. 3. Low platelet count: class 2 HELLP having a platelet nadir between \> 50000 and 100000 mm-3. Exclusion Criteria: 1. Emergency cases 2. Placenta praevia 3. Cardiovascular or cerebrovascular disease. 4. Morbid obesity with a BMI ≥40 5. Gestational age \<36 or \>41 weeks 6. Platelet counts less than 50000 mm-3; class 1 HELLP and class 3 HELLP having platelet count more than 100 000 mm-3

Locations (1)

Assiut university hospital, Faculty of medicine

Asyut, Egypt

Outcomes

Primary Outcomes

The incidence of perioperative mortality in both groups.

Maternal

Time frame: up to one week postoperative

Secondary Outcomes

occurence bradycardia

heart rate less than 50 beat/min

Time frame: up to 24 hours postoperative

occurrence of tachycardia

heart rate more than 120 beats/min

Time frame: up to 24 hours postoperative

occurrence of hypotension

mean arterial blood pressure \< 40% of the baseline

Time frame: up to 24 hours postoperative

occurrence of hypertension

mean arterial blood pressure \> 40% of the baseline

Time frame: up to 24 hours postoperative

incidence of cerebral hemorrhage

detected by CT in patients with neurological deficits

Time frame: up to one week postoperative

Data from ClinicalTrials.gov

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