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Official websites use. Share sensitive information only on official, secure websites. Reviewed by: Jolanta B. This article was submitted to Psychopharmacology, a section of the journal Frontiers in Psychiatry. The use, distribution or reproduction in other forums is permitted, provided the original author s and the copyright owner s are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. Synthetic cathinones are a heterogenous group of new psychoactive substances NPS with a surging prevalence of use. Due to limited availability of NPS screening tests, inadequate legislation, the exponential increases in availability of new NPS and the comorbid use of other illicit substances, scientific research remains scarce. As a result, insight in their mental and psychomotor effects is limited. Besides a severe paranoid psychotic state of mind, characterized by persecutory and somatic delusions, there was also a very pronounced psychomotor restlessness during the whole period of hospitalization which was diagnosed as akathisia. She reported that she was unable to sit during meals, had difficulty standing still and felt a constant urge to pay attention to the restlessness. The patient did not take any antipsychotic medication at admission. The patient was treated in accordance with the current guidelines concerning akathisia with a combination of Quetiapine mg, Propranolol 80 mg, Diazepam 10 mg, Biperiden 4 mg, and Mirtazapine 15 mg without any sufficient alleviation of complaints. Before the start of the treatment, Barnes Akathisia Rating Scale BARS score was 11 out of 14 which evolved toward a score of 7 over the course of the 40 day hospitalization, implying persisting severe akathisia which only improved modestly. The current case suggests that besides cocaine, amphetamines and methamphetamines, synthetic cathinones can also increase the risk for development of extrapyramidal symptoms such as akathisia. Especially a-PVP-analogs as used by the current patient and Pyrovalerone-analogs such as Methylenedioxypyrovalerone MDPV are very powerful dopamine reuptake-inhibitors which might lead to strong locomotor activation. Up to this day it remains very difficult to establish a guideline concerning the treatment of intoxication with synthetic cathinones or dependence thereof. Synthetic cathinones are a group of new psychoactive substances NPS with an increasing prevalence of use. It is a heterogeneous group of substances that have a varying binding selectivity and affinity 2. Some synthethic cathinones act as a hybrid compound both blocking the reuptake inhibitor and acting as a substrate of the monoamine receptors thus increasing the mono-amine concentration in the synaptic cleft leading to hyperexcitation of postsynaptic receptors 1. In addition to sympathomimetic side effects, cardiovascular side effects are also frequently reported 3. Furthermore agitation, anxiety, paranoid delusions, and uncontrollable psychomotor agitation are known side effects 4. Due to limited availability of NPS screening tests, insufficient legislation, the exponential increases in availability of new NPS and the comorbid use of other illicit substances scientific research remains scarce 2. Akathisia is a movement disorder characterized by the subjective feeling of inner restlessness or nervousness with a strong urge to move. Examples of such repetitive movements include crossing the legs, rocking or shuffling from one foot to the other 5 , 6. The pathophysiology of akathisia has not yet been fully identified, but the basal ganglia and more specifically the Nucleus Accumbens are most often indicated in the development of extrapyramidal movement disorders including akathisia 7. There is no widely used cut-off for the total score of the BARS, but a global clinical assessment of 2 out of 5 is considered as positive for having akathisia 9. Patient A, a year-old lady with a severe substance use disorder for various substances in addition to a psychotic vulnerability, was involuntarily admitted for a fixed period of 40 days following a paranoid psychotic outburst while being intoxicated. At the time of admission, the patient looked very unkempt. The patient was poorly oriented in time and place, was for the most part uncooperative and had difficulties having a coherent conversation. Sustained attention was affected, and there was logorrhea. There were persecutory and somatic delusions e. There were no visual or auditory hallucinations. Furthermore, the patient experienced severe psychomotor restlessness. She reported that she was unable to sit during meals and was continuously rocking back and forth. Finally, there was subconjunctival hemorrhage of unknown etiology. In addition to the severe psychotic state, the patient found it impossible to eat in a sitting position, found it extremely difficult to stand still and had the feeling that she had to pay attention almost continuously. It was unclear how long the akathisia had already been present. There were no signs of other extrapyramidal symptoms acute dystonia, parkinsonism or tardive dyskinesia present. The patient did not take any antipsychotic medication in the 6 months prior to admission. There was no prior history of traumatic brain injury, no neurological antecedents in the patient or for so far known her family. Possible differential diagnoses considered for akathisia were ADHD, agitated depression, agitation due to manic or psychotic states and Restless Legs Syndrome but we had insufficient clinical arguments, based on thorough anamnesis and clinical psychiatric examination to withhold any of these diagnoses. There was no history of major mood disorders, nor did she take any antidepressants or mood stabilizers. There was no history of substantial attention deficits or hyperactivity in early childhood and no increase of restlessness in bed or during the night. The restlessness also stayed long after psychotic features disappeared. The patient had no history of psychotic features in absence of substance abuse. As a result, no further screening instruments were used. Anamnestically we learned that from the age of 17, there was also heavy Ketamine use up to 8 grams per day for which there were several episodes of emergency presentation with abdominal cramping, falling within the phenomenon of k-cramps: Biliary obstruction and dilatation in patients with heavy ketamine usage. In the past there was also sporadic use of cocaine, amphetamines, 3,4-methylenedioxy-methamphetamine MDMA , 4-Bromo-2,5- dimethoxyphenethylamine 2-CB , gamma hydroxybutyrate GHB and heroin. Earlier emergency reports do not mention similar akathisia symptoms, nor did the patient mention experiencing them during the usage of these substances. She stopped taking before mentioned substances around 3 years prior to current hospitalization, when she switched to synthetic cathinones. Previous psychiatric assistance was limited to a day crisis admission, 6 months before the current admission because of a substance induced paranoid psychotic episode, in the absence of akathisia or any other psychomotor symptoms. Psychotic symptoms were treated with aripiprazole 30 mg, leading to an alleviation of the symptoms, but the treatment was immediately discontinued after hospitalization. There was also a significant familial burden: The father had been alcohol abstinent for about 2 years and had also been dependent on amphetamines and cocaine in his youth. Mother had known for 25 years varying periods of heroin addiction and methadone dependence. When she was born, the patient was thus hospitalized for an extended period because of methadone withdrawal. Routinely toxicology testing for stimulants such as cocaine, amphetamine and methamphetamine but also cannabis, benzodiazepines and opiates repeatedly showed negative during current hospitalization, but the patient admitted to having used a combination of several synthetic cathinones before admission, and she managed to use these substances once during hospitalization. Figure 1 represents a summarizing timeline of pharmacological treatments. The psychotic features were initially treated for 5 days with Olanzapine up to 30 mg daily but given persistent complaints of motor restlessness was switched initially to Quetiapine mg and was diminished to mg daily. Quetiapine was administered for 35 days the remainder of the hospitalization period under which the psychotic features stabilized. Propranolol was also associated for the whole period of hospitalization 40 days and was increased to 80 mg while monitoring her vital parameters. Due to limited effects on akathisia, additionally Diazepam 10 mg was given at day 10 and was continued for 30 days. Despite these interventions, akathisia remained present, resulting in the addition of Biperidene 4 mg at day 19, which was continued during the last 21 days of hospitalization. Mirtazapine 15 mg was briefly associated without convincing effect. Intake of the medication was systematically supervised by nursing staff. The BARS score stayed high at discharge, with a total score slightly dropping to 7 in total and 2 out of 5 at the global clinical assessment subscale. The patient left the hospital at her own request at the end of her involuntary admission, despite the presence of persisting symptoms and as a result, some treatment options were left unexplored. Despite the administration of propranolol, a pulse of — beats per minute was consistently measured, followed by an electrocardiographic check-up. To exclude epileptogenic activity and neurotoxicity, a control EEG and brain MRI were also performed: Both could not retain any abnormalities. The biochemical workup and blood pressure also showed reassurance. There was no sign of inflammation CRP 1. The differential diagnoses of hyperactive delirium and neuroinflammation were therefore excluded. Cathinone is the psychoactive substance found in the plant Catha Edulis Khat , which grows primarily in the horn of Africa and the Arabian Peninsula The leaves of the plant are chewed, releasing the psychoactive substance. The first synthesized cathinones were created in the s because of their potential as antidepressants and appetite suppressants. For example, Methcathinone became the first commercialized synthetic cathinone to be marketed as an antidepressant in and s primarily in the Soviet Union 2. Currently, Bupropion is the only synthetic cathinone still commercially available. Methylone which was never commercialized—unlike Pyrovalerone and Amfepramone—was the first synthetic cathinone to be traded on European black markets as a recreational stimulant at the turn of the century. This was because of its potential psychostimulant effect similar to MDMA. They produce a euphoric feeling with increased empathy, openness, social reciprocity and libido. Their popularity has also been sustained because of high cocaine prices as well as reduced purity of amphetamines and the lack of proper screening to confirm use 2 , The latter name was given to them mainly because of the lagging legislation. In mephedrone was the first synthetic cathinone to be listed in legislation as an illegal drug. In the following years, however, more new cathinones were developed than there were added to the legislation. In , 8 new agents were released, while 69 similar derivatives found their way to recreational users between and 2. There is an increasing prevalence of use of NPS. The world wide web serves as a primary source of information about these drugs. Users can obtain information about new products through online forums, chat rooms and blogs but also buy them in online shops where consumers are targeted by aggressive marketing strategies attractive names, colorful packaging and free samples. Multiple of these websites also contain medical misinformation making them a possible public health risk. Cyberspace could however also be an excellent environment for information campaigns aiming at prevention of NPS abuse 14 , Synthethic cathinones can be ingested in a variety of ways, but the most common distribution forms are: oral tablet, pill, liquid , nasal, intravenous as well as inhalation as a gas. The half-life of synthetic cathinones averages from 1. In comparison, the half-life of cocaine is about 1 h while that of amphetamine is 10—13 h Cathinones are for the most part excreted through the urine and despite its strong psychoactive effect it has only limited blood-brain barrier permeability, presumably due to the low lipophilic nature of the substance 2. This makes users more easily inclined to overuse or use higher dosages compared to amphetamine. Some cathinones also directly release Serotonin, Dopamine or Noradrenaline 1. Although they have a similar chemical structure, their binding strength, selectivity and affinity are very different from each other. They are also subdivided according to this selectivity and affinity. A second group consists of substances with selective inhibition for DAT, with also potent inhibition of NET such as methamphetamine. Among others, buphedrone, fephedrone, methcathinone, and pentedrone belong to this category. In addition to sympathomimetic side effects blurred vision, dry mouth, hyperthermia and mydriasis , cardiovascular side effects are also frequent increased blood pressure, tachycardia, arrhythmias and coronary spasms 3. Agitation, anxiety, paranoid delusions, and uncontrollable psychomotor agitation are also known side effects 4. The phenomenon was described in —before the existence of antipsychotics—as the inability to sit down, but then ended up under the category of extrapyramidal symptoms Akathisia is the most common and disabling movement disorder that can occur as a side effect of antipsychotics. In addition, patients treated with more than one SGA had a risk up to three times greater than patients treated with monotherapy SGA The pathophysiology of akathisia has not yet been fully identified, but the basal ganglia and more specifically the Nucleus Accumbens are most often indicated in the development of extrapyramidal movement disorders including akathisia. The classic hypothesis is an imbalance between the dopamine and serotonin, noradrenaline, acetylcholine and GABA neurotransmitters 7. Other possible mechanisms are dopamine depletion due to substance abuse, but there is also evidence of over stimulation of the locus coeruleus, neuroinflammation, or damage to the blood-brain barrier In our case study, we encountered a year-old lady with a substantial dependence on synthetic cathinones, pronounced psychotic symptomatology and severe, difficult-to-treat akathisia. The treatment of akathisia broadly consists of two possible interventions: Modifying or reducing the antipsychotic used and adding an agent specifically against akathisia. Suggested antipsychotics that would reduce akathisia are Quetiapine and Chlorpromazine or in second line Clozapine. Suggested agents specifically against akathisia are Propranolol 40—80 mg , Mirtazapine 15 mg or Biperidene 2—6 mg. In second line, Amantadine mg or Clonidine up to 0. Pregabalin, Gabapentin, Vitamin B6 and N-acetylcysteine also showed some effect in some studies 25 — For the current patient, it was appropriate to reduce the dose of antipsychotics as well as opt for a relatively low-risk SGA Quetiapine for the treatment of the remaining psychotic features. The delusions diminished considerable and were less overt but where never fully absent. Clozapine was not considered since the psychotic symptoms were significantly influenced by substance abuse. In addition, our patient was treated with Propranolol 80 mg, Biperidene 4 mg and Diazepam 10 mg resulting in some improvement but no complete absence of akathisia. Since the patient was unable to remain abstinent for at least a month—she fled the department once after 18 days—the diagnosis of tardive dyskinesia or tardive akathisia after abuse of synthethic cathinones could not be made despite of correct treatment of the akathisia. Although the BARS scored positive for akathisia, a phenotype of excited catatonia secondary to usage or withdrawal of synthetic cathinones could unfortunately not be excluded In that case, subsequent treatment would consist of high doses of benzodiazepines without simultaneous administration of other pharmaceuticals and perhaps even electroconvulsive therapy ECT Synthetic cathinones are a heterogeneous and diverse group of substances, each with a distinct mode of action and receptor binding affinity. Some cathinones are pure uptake inhibitors of dopamine, serotonin or norepinephrine, while others also release dopamine, serotonin or norepinephrine. Like cocaine, amphetamine and methamphetamine, synthetic cathinones also seem to be able to give rise over time to various movement disorders such as tremor, gait disorders, parkinsonism and hyperkinetic disorders such as dyskinesias, dystonias and akathisia. However, research in this area is mainly limited to animal studies, in vitro studies and case reports, partly due to the limited possibility of testing, rapid increase of new substances and often comorbid use of other drugs. The patient fully supported the suggested evidence-based treatment options. She did however not wish to stay longer in the hospital than legally imposed. The patient was supportive for the publication of her case and signed an informed consent. Synthetic cathinones are a broad group of products. They all have stimulatory effects, but nevertheless vary greatly in their binding strength, selectivity and affinity. Rapid development of new products, limited testing opportunities and lagging legislation make them difficult to detect, investigate and regulate. To varying degrees, they may pose a risk of developing extrapyramidal symptoms such as akathisia. An early and correct interpretation of akathisia is important given that a misinterpretation of akathisia as general agitation can lead to increasing the dosage of antipsychotics with a paradoxical worsening of symptomatology. Ethical review and approval was not required for the study on human participants in accordance with the local legislation and institutional requirements. Written informed consent was obtained from the individual s for the publication of any potentially identifiable images or data included in this article. NA treated the patient, wrote the case report, and collaborated in literature research. KC was the leading treating clinician, collaborated in literature search, and reviewed the case report. MM collaborated in literature research, and reviewed the case report. All authors contributed to the article and approved the submitted version. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher. This section collects any data citations, data availability statements, or supplementary materials included in this article. As a library, NLM provides access to scientific literature. Front Psychiatry. Find articles by Niels Albert. Find articles by Kirsten Catthoor. Find articles by Manuel Morrens. Received Sep 16; Accepted Dec 7; Collection date Open in a new tab. Similar articles. Add to Collections. Create a new collection. Add to an existing collection. 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