Background and Purpose-Therapeutic application of diagnostic ultrasound has been shown to improve recanalization rates in patients with acute cerebral vessel occlusion. There is experimental evidence that low-frequency ultrasound may be superior. This study was designed to evaluate the therapeutic efficacy and safety of low-frequency ultrasound in an embolic middle cerebral artery occlusion model in rats. A parameter setting was used that had not previously shown any side effects and interactions with healthy rat brain tissue. Methods-Male Wistar rats were submitted to middle cerebral artery clot embolism and transcranial treatment with 20-kHz continuous-wave ultrasound (0.2 W/cm 2 ), either alone or in combination with recombinant tissue-type plasminogen activator. Control groups received no treatment or recombinant tissue-type plasminogen activator alone. Outcome assessment consisted of determination of infarct volume and neurological evaluation. Results-Eleven animals treated with ultrasound died during the follow-up period of 7 days, compared with 2 animals in the control groups (Pϭ0.028). In 3 animals, subarachnoid hemorrhage was detected (1 in the control group). The other animals that died displayed secondary worsening after an initial period of normal vigilance. Histological examination revealed massive edema formation. In surviving animals, no benefit of treatment could be demonstrated. Conclusions-In this study, 20-kHz continuous-wave ultrasound caused death in a significant number of animals.Ultrasound at 20 kHz does not seem to be suitable for transcranial therapeutic cerebral application. The data underline the necessity to obtain further animal data to establish the safety limits of frequency and power output.

This case report gives insight into the mechanism of cerebral venous air embolism. This is the firstcase describing jugular valve insufficiency as the missing link between peripheral air embolism and cerebral venous air entrapment.

Due to marked variability of Q and NQ concentrations in the blood, therapeutic drug monitoring may be helpful to identify pharmacokinetic peculiarities. The lack of correlation between serum concentrations of NQ and clinical improvement casts doubts on the concept that NQ is the pharmacologically active principle for the augmentation therapy.

We report about a patient (66 years) who was referred to our psychiatric hospital because of a progressive confusional state with acute onset. The colleagues of the referring psychiatric hospital considered a first manic episode as the cause of the symptoms and under therapy with haloperidol the confusional state had shown a progression.The clinical examination's findings were a mild central facial paresis on the right side and a mild hemiparesis on the right side with elevated reflex levels.The patient was disoriented, he had cognitive and mnestic deficits. His reasoning was slowed, incoherent and perseverating. The patient had a slight euphoria.An EEG recording showed a continuous regional EEG-seizure pattern. In combination with the clinical symptoms we diagnosed a nonconvulsive status epilepticus. Under anticonvulsive treatment with Lorazepam and Valproic acid the status epilepticus sustended but a control EEG recording showed signs of a Valproate-encephalopathy. Under treatment with Topiramate symptoms ameliorated but due to a vascular dementia the patient still showed fluctuating symptoms of cognitive and mnestic disturbances.

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