Intramuscular Ephedrine in the Prevention of Hypotension in Patients Undergoing Spinal Anesthesia

Last updated: August 10, 2022
Sponsor: Hospital de Base
Overall Status: Active - Recruiting

Phase

4

Condition

Anesthesia (Local)

Vascular Diseases

Dizzy/fainting Spells

Treatment

N/A

Clinical Study ID

NCT05498857
i.m. ephedrine
  • Ages > 18
  • All Genders

Study Summary

Subarachnoid anesthesia is an alternative and usually the first choice for many surgical procedures. It is a simple and safe procedure, however it can present complications such as hypotension and bradycardia. In this sense, ephedrine, an alpha and beta agonist agent, commonly used as rescue therapy for these events, is also potentially useful for prophylaxis of this unwanted effect and for less hemodynamic variation when preventively administered via the intramuscular route. Two groups will be divided: intramuscular ephedrine (0.5 mg/kg) and placebo. The variables analyzed and compared will be the incidence of hypotension and bradycardia, variation in mean and systolic blood pressure, heart rate, in addition to side effects. The main objective is to verify if the use of intramuscular ephedrine prior to spinal block is able to reduce the incidence of hypotension.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Patients over 18 years old, electively scaled for surgery requiring neuraxial block,with programming of spinal anesthesia.
  • Physical State 1, 2 or 3 of the American Society of Anesthesiology (ASA)

Exclusion

Exclusion Criteria:

  • Patients taking prophylactic or therapeutic anticoagulation, except respecting theallowed range;
  • Patients with atrioventricular block
  • Patients with cardiac arrhythmias
  • Patients with heart failure;
  • Patients with renal disease
  • Patients with liver disease
  • Patient carrying or suspecting any type of systemic infection or located in a puncturesite;
  • Patients who refuse to participate in the study after presenting the free and informedconsent form;

Study Design

Total Participants: 202
Study Start date:
July 15, 2022
Estimated Completion Date:
July 31, 2023

Study Description

Subarachnoid or spinal anesthesia is an alternative and usually the first choice for many surgical procedures of the lower limbs, perineum and lower abdomen. It is a simple and safe procedure, however it can present complications such as hypotension and bradycardia. The incidence of hypotension and bradycardia is approximately 30 and 10%, respectively, during spinal anesthesia, however, the incidence of hypotension can be as high as 50 to 60% in obstetric patients.

In this sense, it is common for ephedrine, an agent with beta and alpha agonist action, to be the medication of first choice for rescuing hypotension and bradycardia after subarachnoid block, with part of its action happening by a direct mechanism and part by stimulus and indirect release. of endogenous catecholamines stored in the adrenal.

It is known that intramuscular administration has slower absorption and lower bioavailability of the drug compared to intravenous administration. Therefore, we have in our favor: a later serum peak, coinciding with the establishment of sympathetic block after spinal anesthesia, as well as more insidious effects, with less tendency to peaks and valleys and greater hemodynamic stability when compared to therapy alone. intravenous rescue. To assess this response, the main objective of the present study is to verify the hypothesis that the previous administration of ephedrine by intramuscular route reduces the incidence of hypotension induced by spinal anesthesia.

The proposal is a prospective, randomized, double-blind, placebo-controlled study in surgical procedures. Examiners responsible for evaluating patients will not have access to the agents used. Patients will be randomized through a list generated by lottery. The examiner responsible for opening the envelope, will perform the drawing, include the patient in one of the groups, write down his/her data in the random list, prepare the syringe with the medication, and deliver it to the operating room so that the following examiners will not be aware of the administered drug.

Patients will receive standard monitoring, venoclysis, intravenous midazolam as pre-anesthetic medication. Then, the study drug will be administered (ephedrine 0.3mg/kg intramuscularly or placebo). All patients received spinal anesthesia with hyperbaric bupivacaine and opioid adjuvants at the discretion of the anesthesiologist, except clonidine.

The evolution of vital signs such as systolic and mean blood pressure, heart rate, height of sensory block, incidence of adverse events such as bradycardia, tachycardia, hypertension or hypotension, nausea, vomiting, consumption of vasopressors and antiemetics will be evaluated.

Connect with a study center

  • Hospital de Base do Distrito Federal

    Brasília, DF 70330-150
    Brazil

    Active - Recruiting

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