Drug-induced headache: an analysis of therapeutic strategies

To manage patients with drug-induced headache (DIH) is an unsolved problem of modern neurology in developed countries, since DIH is becoming a common cause of temporary disability and leads to lower quality of life in patients. Patients with primary headache (for example, those with tension headache or migraine) frequently take symptomatic headache relief medications uncontrollably, which can result in the higher frequency and intensity of DIH episodes. In turn, new headache attacks make the patients take the increasing number of symptomatic medications, which leads to the development of DIH.The International Classification of Headache Disorders, 3 rd Edition, defines DIH as a distinct form of secondary headache. To date, there is no consensus on the tactics of DIH treatment and prevention. The paper discusses different approaches to DIH prevention and treatment, the effectiveness and appropriateness of their use, as well as factors influencing illness course and possible outcomes. Particular attention is paid to the management of patients during the withdrawal period, risk factors for DIH recurrences, and ways of their prevention.

Multidisciplinary Care of Unruptured Brain Arteriovenous Malformations to Improve Symptomatic Headache and the Onset, Progression, and Outcomes of Unruptured Brain Arteriovenous Malformations

Background: Symptomatic headaches attributed to unruptured brain arteriovenous malformations (ubAVMs) are very common and affect patients’ quality life, but multidisciplinary care of ubAVMs to improve symptomatic headache remains unclear. Objective: The objective is to identify the features of symptomatic headaches, and to obtain headache outcomes following multidisciplinary care of ubAVMs, as well as provide background on the natural history of ubAVMs. Study Design: The features of symptomatic headaches and headache outcomes were analyzed in a large cohort of cases after multidisciplinary care of ubAVMs. We have also provided information on the natural history of ubAVMs Setting: This study was conducted at the Department of Neurosurgery of Zhujiang Hospital where 336 patients from 1998 to 2014 were reviewed by a multidiscipline team. Only 124 patients were eligible. Methods: The demographics, clinical features, imaging features, and headache details of eligible patients were reviewed. An 11-point pain scale score was used to assess symptomatic headaches before, during, and after treatment. The headache outcomes, death or stroke, and adverse functional outcomes (modified Rankin Scale score ≥ 2, mRS ≥ 2) were assessed following multidisciplinary care of ubAVMs. Results: Twenty-three (56.1%) of 41 patients had migraine-like headaches located in occipital lobe (P < 0.001), while forty (63.5%) of 63 patients had tension-type-like headaches located in frontotemporal lobe (P < 0.001). For patients with tension-type-like or all types of headache, headache improvement differed between the multidisciplinary group and medical group (87.8% vs. 31.8%, P < 0.001; 85.7% vs. 40.7%, P < 0.001). The risk of death or stroke did not differ between multidisciplinary group and medical group (P = 0.393), whereas the risk of adverse functional outcome (mRS ≥ 2) differed significantly by long-time follow-up (23.0% vs.10.0%, P = 0.022). Limitations: This study provides the initial experience to support multidisciplinary care for ubAVMs to improve symptomatic headaches and patients’ quality life, but based on the retrospective study with inherent limitations, larger samples and multi-center trials are needed on this interesting issue. Conclusions: Occipital ubAVM is more likely to present with migraine-like headache, while frontotemporal ubAVM tends to present with tension-type-like headache. The effectiveness of multidisciplinary care for ubAVM to improve headache has been shown, but the natural history of ubAVM patients with headache remains unclear. Key Words: Unruptured brain arteriovenous malformations, headache, headache improvement, natural history

Intracranial arachnoid cyst: an institutional experience

Aim: In this study, symptoms at presentation, indication for surgery, surgical treatment modalities, postoperative results and complications were studied. Material and methods: We retrospectively compiled the details of patients with IAC from admission and operative records admitted through our OPD during the period between January 1995 and January 2015. Only those patients were admitted whose symptoms attributes to the cyst and asymptomatic patients were followed on OPD basis. This is a single institutional study. Results: This study includes 56 patients of IAC who were operated. Posterior fossa cysts (62.5%) were found more commonly symptomatic. Headache (32%) was the most common symptom in a patient with IAC. Out of all, 24 patients presented with headache and underwent surgery subsequently; 20 showed satisfactory relief after surgery while four showed partial relief. Size of cyst was significantly reduced after surgery in 52 patients after 12 weeks but four patients, who underwent cystoperitoneal shunt, required re-operation as patients showed no decrease in size of cyst due to shunt malfunction. Head circumference was reduced following intervention in infant patients. Three patients who presented with visual field defects with IAC in sellar region showed improvement after endoscopic fenestration of cyst. One of the patient with cerebellopontine angle arachnoid was died immediately after marsupialization due to unexplained bleeding. Conclusions: IAC is not an uncommon finding on imaging but only few are symptomatic. Patients with Intracranial arachnoid cyst should be treated only if the patient’s symptoms are attributable to the cyst.

Pathophysiology of hypnic headache

Background Hypnic headache (HH) is a rare primary headache disorder that is characterized by strictly sleep related headache attacks. Purpose The underlying pathophysiology of HH is mainly enigmatic but some clinical characteristics such as circadian rhythmicity and caffeine responsiveness may point toward possible underlying mechanisms. Method Current studies that deal with the pathophysiology of HH are summarized. Data on cerebral imaging, sleep, electrophysiology studies, effectiveness of drugs, and symptomatic headache types are discussed to illuminate underlying pathophysiologic mechanisms. Conclusion HH can be clearly differentiated by its clinical presentation as well as imaging and electrophysiological study results from other primary headaches such as migraine or cluster headache. The underlying pathophysiology is still enigmatic but a hypothalamic involvement seems to be likely.

The Forgotten Lumbar Puncture

Lumbar puncture is crucial in two distinct clinical situations in the diagnosis of the headache patient. The first is the patient who is suspected of having a symptomatic headache; the second is the patient with a chronic intractable or atypical headache disorder. This review discusses the usefulness of the lumbar puncture in the diagnosis of headache secondary to subarachnoid hemorrhage, meningitis, and intracranial hypotension and hypertension. The value of lumbar puncture in the presence of a normal CT/MRI scan is discussed.