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Harmuch, C.
Review Article
105
Introduction
e ecacy of cannabis in treating epilepsy was rst reported in
1800 B.C. Early clinical trials with cannabidiol (CBD) in hu-
mans were documented in the 1970s, but it was during the 1990s,
following the discovery of an endogenous cannabinoid signaling
system, that interest grew in the therapeutic potential of cannabis
for treating nervous system disorders, including epilepsy.
Mechoulam and Shvo (1963) rst described two compounds, the
psychoactive delta-9-tetrahydrocannabinol (THC) and the non-
-psychoactive CBD. Studies have shown that both THC and CBD
exhibit anticonvulsant properties in models involving in vitro
experiments and animals. However, most research indicates that
CBD is more eective in reducing epileptic activity compared to
THC, which has a higher potential to cause cognitive impairment
and chronic psychiatric disorders. Other benecial properties of
CBD include neuroprotective, anti-inammatory, and antioxidant
eects.
Despite the illegal status of cannabis in many countries, recent evi-
dence suggests its potential ecacy in treating epilepsy, mainly in
refractory patients.,
Cerebral palsy (CP) is a non-progressive disorder of posture and
movement resulting from a non-progressive malformation or lesion
in the brain, leading to a range of comorbidities in children, inclu-
ding epilepsy, intellectual disability, behavioral, musculoskeletal,
and nutritional issues, sleep problems, and pain.
Epilepsy is considered one of the most common comorbidities,
with a global prevalence of approximately 50 million people. Al-
though numerous antiepileptic drugs have been approved over the
last two decades, there remains a need for more options, as one-
-third of epileptic patients suer from drug-resistant epilepsy.
In the past decade, several countries and institutions have shown
great interest in investigating the role of CBD and its ecacy in
treating pediatric epilepsy, particularly when associated with CP.
As a result, the U.S. Food and Drug Administration (FDA) appro-
ved its use in 2018 for treating seizures in children who meet the
established criteria.
CBD was the rst FDA-approved drug containing a puried subs-
tance derived from cannabis and the rst authorized to treat pa-
tients with Dravet syndrome. However, the medical prescription of
CBD remains controversial. While some members of the medical
community support its use and present it as a treatment option,
others remain hesitant to prescribe and recommend the drug.
e history of the therapeutic use of cannabis, particularly CBD,
in treating epilepsy reveals a trajectory of signicant discoveries and
advancements over the centuries. Nonetheless, the ongoing con-
troversy surrounding its use underscores the need for continued
research, discussion, and guidance to ensure the safe utilization of
this drug. erefore, given the importance of this topic, this study
aims to identify scientic evidence on the use of cannabidiol in
children with cerebral palsy.
Methods
is study is an integrative review aimed at synthesizing existing
knowledge, identifying research gaps, and proposing new studies.
e process was systematic and rigorous, without applying time
restrictions to include as many relevant articles as possible on the
subject.
We followed six key stages: 1) identication of the topic and the
guiding research question, 2) establishment of inclusion and exclu-
sion criteria, 3) denition of the information to be extracted from
the selected studies and their characterization, 4) evaluation of the
included studies, 5) interpretation of the results, and 6) presenta-
tion of the review and synthesis of knowledge.
Initially, we formulated the guiding question using the PICo stra-
tegy: P (Population): children; I (Interest): use of CBD; and Co
(Context): cerebral palsy. Consequently, we adopted the research
question: What is the scientic evidence on the use of CBD in
children with cerebral palsy?
Next, we established the inclusion criteria, which comprised origi-
nal articles published in Portuguese and English, without any time
limits, and related to the guiding research question. As for exclu-
sion criteria, we excluded grey literature (theses, dissertations, mo-
nographs, books, book chapters, congress abstracts, proceedings,
programs, and government reports), opinion articles, letters to the
editor, brief communications, editorials, and integrative reviews.
e data collection took place in April 2024 using electronic da-
tabases: PubMed Central (PMC), Scopus (Elsevier), Embase, and
ScienceDirect. We applied Health Sciences Descriptors (DeCS)
and Medical Subject Headings (MeSH) in Portuguese and their
English equivalents: “Canabidiol/Cannabidiol,” “Paralisia Cere-
bral/Cerebral Palsy,” and “Criança/Child.”
e search strategies were adapted to each database based on the
PICo strategy and its keywords and entry terms. We applied the
OR boolean operator to distinguish terms and AND to associate
them, resulting in the following search expression: ((("cannabi-
diol"[MeSH Terms] OR "cannabidiol"[All Fields]) AND ("chil-
d"[MeSH Terms] OR "child"[All Fields])) AND ("cerebral palsy"[-
MeSH Terms] OR ("cerebral"[All Fields] AND "palsy"[All Fields])
OR "cerebral palsy"[All Fields])) AND ("epilepsy"[MeSH Terms]
OR "epilepsy" [All Fields]).
Once we retrieved the publications, we organized the studies using
Microsoft Excel® to identify and exclude duplicates, counting re-
peated studies only once. We reviewed the titles and abstracts to
include studies closely related to the research topic, followed by a
full-text reading to conrm their eligibility. We included studies
that fully addressed the research question, resulting in a nal sam-
ple of nine scientic articles.
e information from the articles was organized into a table contai-
ning data on the title, year of publication and country, objectives,
outcomes, and level of evidence (Table 1). We assessed the level
of evidence following the hierarchical classication of Melnyk and
Fineout Overholt10, which classies evidence into seven levels. I:
evidence from systematic reviews, meta-analyses, or clinical guide-
lines based on systematic reviews of randomized controlled trials
(RCTs); II: evidence from at least one RCT; III: evidence from
well-designed controlled trials without randomization; IV: eviden-
ce from well-designed cohort and case-control studies; V: evidence
from systematic reviews of descriptive and qualitative studies; VI:
evidence from a single descriptive or qualitative study; and VII:
evidence from expert opinions or expert committee reports. We
grouped the studies into three categories according to their cha-
racteristics.
Ethical approval was waived, as this was a review of publicly availa-
ble data without human involvement.