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CompletedNCT04190537PARADOXUpdated Oct 9, 2024

PARADOX - the Incidence of Paradoxical Reactions in Pediatric Patients Premedicated with Midazolam

An observational study in Pharmacological Action, sponsored by Masaryk Hospital Usti nad Labem. Completed at 1 site in Czechia. Open to participants aged 3 Months to 18 Years. Per ClinicalTrials.gov, last updated 2024-10-09.

Sponsored by Masaryk Hospital Usti nad Labem · Observational

Study type
Observational
Model
Other
Time perspective
Prospective
Enrollment
749
Ages
3 Months to 18 Years
Sex
All
01

Study summary

Summary

The premedication is one of the essential sides of pediatrics anesthesia. Midazolam is considered such as standard these days. Children may develope a paradoxical reaction to benzodiazepines which is one of the adverse effect. Its incidence is unknown. The hypothesis is, in pediatric patients undergoing general anesthesia premedicated with oral midazolam, the incidence of the paradoxical reaction is 10%. Primary Goal of the study is to find out the incidence of the paradoxical reaction in pediatric patients premedicated with oral midazolam prior to general anesthesia. Secondary goal is to find out the incidence of the paradoxical reactions in children of different age groups. For the assessment, the study uses parameters: RASS, blood pressure, heart rate, PAED, PSAS, MAS and VAS.

Read the detailed description

The premedication is one of the essential sides of pediatrics anesthesia. Midazolam is considered such as standard these days. Children may develope a paradoxical reaction to benzodiazepines which is one of the adverse effect.

The paradoxical reaction is an abnormal stimulative reaction to benzodiazepines characterized by hallucination, disorientation, alteration in perception and recognition as well as the escalation of negative emotion- uncalming crying, agitation, restlessness, and hostility. Risk factors for the development of the paradoxical reaction are young age, mental illness, genetic disposition, male sex, alcohol abuse, and higher midazolam doses.

The incidence of paradoxical reaction is referred to be about 1-10%, in some specific groups even more (about 29%). The exact incidence is still not known since the accurate definition of paradoxical reaction is still missing.

Primary Goal of the study is find out the incidence of the paradoxical reaction in pediatric patients premedicated with oral midazolam prior to general anesthesia and incidence of the paradoxical reactions in children of different age groups (3 months-1 year, 1 year-3 years, 3 years-6 years, 6 years-12 years, 12 years-18 years) . The calculated file size is 500 patients. All eligible patients should be evaluated for pre-treatment, pre-anesthesia, immediately prior to anesthesia and anesthesia when RASS above -2. For purpose of the study we have determined the definition of paradoxical reaction as an increase in pulse and/or blood pressure of 20% over pre-premedication , RASS increase by one point or more and raising PEAD to 10 or more points. The paradoxical reaction criteria are met if at least two points of the definition are met. Change within 45min. after premedication.

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Conditions studied

  • Pharmacological Action

Keywords

  • Paradoxial reaction midazolam
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In context

Lead sponsor

Masaryk Hospital Usti nad Labem is the lead sponsor of 4 studies on the registry; 1 is open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
3 Months to 18 Years
Sexes eligible
All
Accepts healthy volunteers
No
Sampling method
Non-probability sample

Study population

All eligible patients should be evaluated for pre-treatment, pre-anesthesia, immediately prior to anesthesia and anesthesia when RASS above -2

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

age from 3 months to 18 years

  • oral midazolam premedication for at least 30 minutes before rating
  • patient undergoing deep sedation / general anesthesia diagnostic or surgery with RASS -4 or more

Exclusion criteria

Exclusion Criteria:

  • personal history of benzodiazepines using
  • moderate or severe respiratory insufficiency
  • myopathy, neuromuscular transmission disorders
  • moderate or severe CNS disability, including brain tumors, uncontrolled convulsions
  • age \<3 months and> 18 years
  • pregnancy
05

Study design

Observational model
Other
Time perspective
Prospective
Enrollment
749 participants (actual)
Patient registry
No
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What researchers measure

Primary outcomes

  1. Incidence of the paradoxical reaction in pediatric patients premedicated with oral midazolam prior to general anesthesia.

    Investigate the incidence of paradoxical reactions after administration of midazolam in the pediatric population

    Time frame: Change within 45min. after premedication

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Study locations

1 site
  • Masaryk hospital
    Ústí Nad Labem, 40011, Czechia
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References and documents

Publications

  • Moon YE. Paradoxical reaction to midazolam in children. Korean J Anesthesiol. 2013 Jul;65(1):2-3. doi: 10.4097/kjae.2013.65.1.2. No abstract available. PubMed 23904931 ↗
  • Shin YH, Kim MH, Lee JJ, Choi SJ, Gwak MS, Lee AR, Park MN, Joo HS, Choi JH. The effect of midazolam dose and age on the paradoxical midazolam reaction in Korean pediatric patients. Korean J Anesthesiol. 2013 Jul;65(1):9-13. doi: 10.4097/kjae.2013.65.1.9. Epub 2013 Jul 19. PubMed 23904933 ↗
  • Tobin JR. Paradoxical effects of midazolam in the very young. Anesthesiology. 2008 Jan;108(1):6-7. doi: 10.1097/01.anes.0000296717.85521.b5. No abstract available. PubMed 18156876 ↗
  • McKenzie WS, Rosenberg M. Paradoxical reaction following administration of a benzodiazepine. J Oral Maxillofac Surg. 2010 Dec;68(12):3034-6. doi: 10.1016/j.joms.2010.06.176. Epub 2010 Oct 14. No abstract available. PubMed 20950912 ↗

Individual participant data

Plan to share: No

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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Oct 9, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT04190537
Lead sponsor
Masaryk Hospital Usti nad Labem
Responsible party
Petr Vojtisek (Petr Vojtisek, senior consultant of paediatric anesthesia and IC, Masaryk Hospital Usti nad Labem) — Principal investigator
First posted
Dec 9, 2019
Start date
Sep 1, 2019
Primary completion
Jun 16, 2021
Completion
Jun 16, 2021
Last update
Oct 9, 2024

Study contacts

Petr Vojtisek, doctor
study chair · Masaryk Hospital Usti nad Labem

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Oct 2024. You cannot join it, but the record below documents what was studied.

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