Congenital and genetic cerebrovascular anomalies as risk factors for stroke in Saudi children.

Objective: To explore the role of and report on congenital and genetic cerebrovascular anomalies as risk factors for stroke in a prospective and retrospective cohort of Saudi children.

Methods: Children with stroke were evaluated at the Division of Pediatric Neurology (DPN), or were seen as inpatients in the Pediatric Wards at King Khalid University Hospital (KKUH), Riyadh, Kingdom of Saudi Arabia during the periods July 1992 to February 2001 (retrospective study) and February 2001 to March 2003 (prospective study). Stroke work-up for each suspected case included hemostatic assays, serological, biochemical and neurophysiological tests.

Lack of effect of CO2 on cerebral arterial diameter in man.

Study Objective: To establish the quantitative effects on the diameter of cerebral arteries following controlled changes in arterial carbon dioxide tension (PaCO2).

Design: Nonrandomized interventional study.

Setting: Angiography suite of a tertiary referral hospital.

Enhanced catheter propagation with hypercapnia during superselective cerebral catherisation.

During arterial catherisation of a cerebral arteriovenous malformation it may be difficult or impossible to access the nidus of the malformation through its small, tortuous feeding vessels due to microcatheter impaction. Carbon dioxide, a most potent cerebral vasodilator, was temporarily added to the inspired gases of two anaesthetised patients undergoing superselective embolisation of an arteriovenous malformation, when the microcatheter had been impacted for a considerable time. Successful propagation of the microcatheter into the malformation was achieved in both patients after a relatively short period of hypercapnia.

Solitary intradural intracranial osteoma.

A 20-year-old woman presented with a 4-month history of persistent right frontotemporal headache. There were no features of raised intracranial pressure. Plain radiographs of the skull showed a dense calcified mass in the right frontal area.

Gas-liquid chromatographic determination of thiabendazole and methyl 2-benzimidazole carbamate in fruits and crops.

A method is described for the electron capture gas-liquid chromatographic determination of thiabendazole and methyl 2-benzimidazole carbamate (MBC) after derivatization with pentafluorobenzyl bromide (PFB-Br). The samples are extracted with ethyl acetate, and the residual thiabendazole, benomyl, and MBC are isolated by liquid-liquid extraction into dilute HCl. After neutralization and re-extraction with ethyl acetate, thiabendazole and MBC are reacted with PFB-Br to form the PFB derivatives.

Thin layer chromatographic detection and indirect gas chromatographic determination of three carbamate pesticides.

Carbamate pesticide residues are extracted from vegetables and fruits with methylene chloride. The extracts are spotted on silica gel plates and the pesticides are detected by an enzymatic inhibition technique. For quantitative determination, aliquots of the methylene chloride extracts are evaporated to dryness in a rotary evaporator.