Introduction

Movement disorders following resuscitation from a cardiac arrest are varied. They are represented by parkinsonian syndrome, dystonia, chorea, tics, athetosis, tremor, and myoclonus [1, 2]. These disorders are rare and most often related to lesions of the basal ganglia, which are very sensitive to cerebral hypoxia [2, 3]. We describe a case of generalized dystonia secondary to cardiac arrest.

Case presentation

A 11-year-old child, had mitral and tricuspid valve disease for which an open heart surgery was performed on September 22nd, 2021. Immediately after the surgery, she had a haemorrhagic shock followed by a cardiorespiratory arrest requiring intensive resuscitation for 10 min which was successful. A week later, she developed intermittent cramps followed by generalized muscle contractions affecting the trunk and all 4 limbs (Additional file 1: video 1 and Additional file 2: video 2). The involvement was predominantly in the upper limbs and involved mainly twisting movements. The rest of the neurological examination was normal. Brain magnetic resonance imaging (MRI) showed basal ganglia hypersignals in attenuated fluid inversion recovery (T2-FLAIR) weighted sequence and in the diffusion sequence without restriction of apparent coefficient diffusion (ADC) in favour of subacute ischemic lesions (Figs. 1 and 2). Apart from a leucocytosis of 11,890/mm3 and an anaemia of 10.2 g/dL, the rest of the blood exams were normal: sodium, potassium, calcium, chloride, carbon dioxide, blood urea nitrogen and creatinine. Blood toxicology screen tests were not performed. Oral medical treatment with baclofen (20 mg/day) was proposed. At the 2nd month of follow-up, we noted a regression of dystonia at the second month (Additional file 3: video 3).

Fig. 1
figure 1

Brain MRI in FLAIR sequence showing bilateral and symmetrical hypersignals of the basal ganglia (black arrow)

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Fig. 2
figure 2

Bilateral and symmetrical basal ganglia hypersignals on T2 sequences (black arrow)

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Discussion

The clinical case we reported corresponds to a generalized dystonia secondary to a cardiac arrest in an 11-year-old girl. One of the particularities of this case was its rarity and its acute onset. Indeed, there are few cases described in the literatures [2, 4, 5]. A wide variety of movement disorders can be observed after cerebral hypoxia, including akineto-hypertonic syndrome and dystonia [3,4,5]. This latter may be focal, affecting a hand, foot, or cranial region, segmental or even generalized [2]. These disorders can occur acutely or with delay [7]. Indeed, in his review, Bhatt et al. found a delay in the onset of signs ranging from 1 week to 36 months after cardiac arrest [4]. There is an age-related difference in relation to the type of abnormal movements. The akineto-hypertonic syndrome is more frequent in the elderly, whereas dystonia is more frequent in young subjects such as our patient [2, 4,5,6]. However, the study of Scheibe et al. [8] have not confirmed this effect of age in the type of abnormal movements occurring after cardiac arrest. This could be related to the predominant inclusion of adults and the sample size in his study [8]. Pathophysiologically, it is generally accepted that lesions of the putamen are more responsible for dystonia, whereas lesions of the pallidum lead to an akineto-hypertonic syndrome [6, 7, 9]. However, cases of dystonia secondary to lesions of the medial pallidum have been reported in the literature [9, 10]. This could explain the clinical manifestations of our patient who presented with ischaemia of the putamen and pallidum. The vulnerability of the basal ganglia to cerebral hypoxia/anoxia has been reported by several authors with different hypotheses, the main one being their terminal vascularization [4, 10]. The treatment of dystonia induced by cerebral hypoxia/anoxia is symptomatic [1]. Our patient received oral baclofen because anticholinergics were not available. Her evolution was favourable with a clear regression of dystonic movements. On the other hand, Wiltshire et al. and Ray et al. [11] did not find this same evolution and used other therapeutic means in association with baclofen [2].

Conclusion

It is often difficult to accurately predict the final neurological outcome of a patient who has survived cardiac arrest. Although rare, dystonias are among the complications secondary to cerebral hypoxia and which can alter the quality of life of patients. Their time to onset and evolution are variable. Their treatment is essentially symptomatic.