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Biomedical subjects
A Schubert
Publications and source records attributed to A Schubert.
Deliberate epidural air injection in dogs: a radiographic study.
To investigate whether and to what extent air bubbles are present in the epidural space after injections of air, the authors designed an experiment using a chronic dog model. The epidural space was entered at the sixth or seventh lumbar interspace in six mongrel dogs (weight, 20 to 27 kg). Loss-of-resistance (LOR) to saline was tested to identify the epidural space. Three milliliters of air were injected via a Tuohy needle, followed by 5 ml of contrast material (Isovue 300, Squibb Diagnostics). Anterior-posterior (AP) and lateral radiographs were taken on day 1. On days 2, 4, and 8, the procedure was repeated, omitting the air injection. Radiographs were read by a neuroradiologist. Air bubbles were radiographically demonstrated in all six dogs on day 1, and in three of six dogs on day 2. No air was seen on later films. The air bubbles seen were small and few in number but often located near intervertebral spaces. The authors' findings suggest that injection of large volumes of epidural air should be avoided, particularly when N2O is used as part of the anesthetic or when performing diagnostic peridurography since N2O may expand the volume of existing bubbles and interfere with filling of the epidural space by local anesthetics or contrast material.
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The effect of pH adjustment of 0.5% bupivacaine on the latency of epidural anesthesia.
pH adjustment of lidocaine and 2-chloroprocaine has been reported to decrease the latency of epidural anesthesia (EA). The effect of alkalinization of bupivacaine on onset of surgical anesthesia has not been adequately studied to date. To determine what effect raising the pH of 0.5% bupivacaine has on the latency of EA in patients undergoing lower extremity surgery, we performed a randomized, double-blind study. Forty patients were randomly divided into two groups. Group I patients received 15 ml of a local anesthetic (LA) solution containing 0.5% bupivacaine and 0.15 mEq of NaHCO3. Group II patients received 15 ml of a standard solution of 0.5% bupivacaine. Both solutions contained freshly added epinephrine (1:200,000). After injection of LA via Tuohy needle, sensory testing was conducted using a safety pin. The pH of the LA used for Group I was 6.96 +/- 0.01 and for Group II was 5.33 +/- 0.11. No statistically significant difference was found between the anesthetic parameters tested in each group. On this basis, we find no advantage of pH adjustment of 0.5% bupivacaine for EA.
Adult↗
[Neuropsychological effects of preventive CNS irradiation in adult tumor patients].
Prophylactic cranial irradiation (PCI) has led to marked prolongation of survival, but also to intellectual and neuropsychological retardation in children with ALL. PCI has also been conducted in adult patients with small-cell bronchial carcinoma in the stage of minimal disease or with breast cancer. There are no studies assessing cognitive or other neuropsychological consequences of PCI in adult cancer patients. We report on a longitudinal prospective study of the effects of PCI on five major neuropsychological domains (intelligence, concentration, attention, memory and psychomotor performance). We report on our ongoing study, in which up to now 11 patients with small-cell lung cancer undergoing PCI have been investigated. Patients are assessed immediately before therapy started as well as 4 weeks and 3 months after onset of PCI. The used instruments are Standard Progressive Matrices (SPM), d2 Concentration Test, Minimental State, Verbal Learning Test and Psychomotor Tests (Steadiness, Aiming, Tapping, Tracking, Pursuit Rotor Test). Although our sample is small, results indicate that there is no evidence for a decrease in neuropsychological abilities in adults after three months. This is in contrast to the observed results after PCI in children. As compared to baseline measures, differences in memory, intelligence, concentration and attention were marginal over time. Moreover the progress of motor performance skills showed no clear tendency.
Adult↗