Changes in visual evoked potentials and decreased intracellular magnesium levels have been separately described in patients affected by migraine both during the attacks and in the interictal periods. An inverse correlation between increased P100 amplitude and lowered serum magnesium levels was found in children suffering from migraine with and without aura in a headache-free period. A 20-day treatment with oral magnesium pidolate seemed to normalize the magnesium balance in 90% of patients. After treatment, the reduced P100 amplitude confirmed the inverse correlation with the serum magnesium level. These data seem to suggest the hypothesis that higher visual evoked potential amplitude and low brain magnesium level can both be an expression of neuronal hyperexcitability of the visual pathways related to a lowered threshold for migraine attacks.

To the Editor:Cetuximab is a drug with an expanding role in the treatment of solid tumors, in particular epidermal growth-factor receptor or EGFRexpressing metastatic colorectal cancer. Like other EGFR inhibitors (panitumumab, matuzumab) and EGFR-specific tyrosine kinase inhibitors (gefitinib, erlotinib), cetuximab is characterized by significant incidence of skin reactions (80%e86% of patients), such as acneiform eruption, xerosis, eczema, and hair and nail changes. 1 These skin reactions can be complicated by itch. Treatment of itch is based on oral antihistamines and topical creams. No standard treatment is suggested in case of failure of these drugs. 2e4 New anti-epileptic drugs, particularly gabapentin, have proven to be safe and effective in the treatment of itch of various origins. 5e7 Pregabalin has similar structure and action to gabapentin and it is indicated for the management of neuropathic pain. It has never been tested for the treatment of itch.

The Supportive Care Task Force (SCTF) was established within the Medical Oncology Department at the University of L'Aquila in May 2002. The missions of the SCTF were to allow systematic evaluation and treatment of symptoms, to warrant continuity of care in all phases of disease and to provide medical oncology residents with training in the treatment of symptoms. A medical oncologist, two senior residents in medical oncology and a registered nurse comprised the SCTF. A psychiatrist, two neurologists, a dietician, and two physiotherapists served as consultants or on a part-time basis. Four beds in two-bedded rooms inside the Medical Oncology Department were reserved to SCTF. A close integration with the physicians of the Medical Oncology Department was realised. The only criterion to admission was the presence of uncontrolled symptoms. Patients were evaluated and monitored with the visual analogue scale for pain and with the Edmonton Symptom Assessment Scale (ESAS). The Palliative Prognostic Score (PaP Score) was employed to assess the prognosis. Non-clinical needs were evaluated with the Need Evaluation Questionnaire (NEQ). Protocols for the treatment of common symptoms were available in written form for consultation by physicians, residents and nurses. From 1 May 2002 to 31 May 2004, we observed 208 patients: 111 women and 97 men. The median age was 64.7 (range 28-90) years. Fifty-four patients (25.9%) were admitted more than once, for a total of 285 admissions. One hundred ninety-nine admissions (69.5%) were for supportive care while 86 admissions (30.5%) were for supportive care and active treatment. The most frequent symptoms were asthenia and anorexia. We registered excellent results regarding the treatment of pain, nausea and dyspnea while psychological symptoms, anorexia and asthenia proved more difficult to treat. Two hundred twenty patients were discharged: 142 (49.8%) home; 76 (26.7%) to the Home Care Service and two (0.7%) to others units of the hospital. Sixty-five (22.8%) died in our unit.

Changes in visual evoked potentials, mainly affecting the amplitude of the major positive wave, are referred to by many authors and are related to the pathophysiological basis of primary headache. We performed both transient pattern-reversal visual evoked potentials and spectral analysis by means of fast Fourier transform of 8-Hz steady-state pattern-reversal visual evoked potentials in 34 children affected with migraine (14 with aura, 20 without aura), and compared them with 14 patients with tension-type headache and 10 healthy subjects. The amplitude of the response to the transient stimulation (P100) was higher and the latency shorter in the patients with headache compared with the controls, but the difference was not statistically significant. The absolute power of the first harmonic (1F) obtained by the spectral analysis of the steady-state stimulation was increased in all the patients with headache compared with the controls, and the increase was significant in patients with migraine. These data seem to confirm the hypothesis of abnormal processing of visual input in migraineurs and could be interpreted as neurophysiological support for the theory that different headache types are related conditions. Furthermore, the spectral analysis of steady-state pattern-reversal visual evoked potentials could be proposed as a test to diagnose migraine.

Nine patients with advanced cancer suffering from idiopathic severe sweating were treated with gabapentin (600-1,800 mg/day). All patients responded to the treatment; five patients experienced transient drowsiness. Gabapentin seems to be a safe and effective treatment for idiopathic sweating in advanced cancer patients. Further studies are warranted to confirm or refute these results.