This study evaluates the outcome of an intervention performed often in an emergency situation. Since approximately half of patients will not be able to give informed consent at admission, the informed consent procedure for this study will be delayed in a so-called emergency procedure. If neither the patient is capable of giving informed consent nor a family representative (informed consent) is available in due time, an independent neurosurgeon not involved in the patient's treatment nor in the trial may be asked for study approval. This option was introduced into the consent procedure because data on smart-phone guided ventriculostomy suggest a potentially beneficial effect of the measure for the patient - however performed in a small group of 35 patients. Therefore it shall not be categorically withheld from patients who are not capable of deciding whether to participate in the study or not and who do not have a legal representative. As soon as a legal representative / family representative is available and/or the patient is capable again to consent to the study, he or she must be asked to give informed consent.