Depression: Namiki M

Namiki M, Akaza H, Shimazui T, Ito N, Iwamoto T, Baba K, Kumano H, Koh E, Tsujimura A, Matsumiya K, Horie S, Maruyama O, Marumo K, Yanase T, Kumamoto Y, Anonymous00062, Anonymous00063. · No affiliation provided · Int J Urol. · Pubmed #18452452 No free full text.

This publication has no abstract.

Namiki M, Kita A, Kokita N, Ichimiya T, Namiki A. · Department of Anesthesiology, Sapporo Medical University, School of Medicine, Sapporo 060-8543. · Masui. · Pubmed #15446683 No free full text.

Abstract: A 68-year-old woman had felt a chest and back pain for 3 months. Gradually her symptom became aggravated, and she felt severe dyspnea in supine position and dysphagia combined with superior vena cava syndrome. A huge posterior mediastinal tumor was revealed and her esophagus was severely narrowed on the chest MRI. Therefore, emergency tumor resection was scheduled under general anesthesia. Anesthesia was induced by midazolam (2 mg) with the patient in the right lateral position. After gas exchange and oxygenation were comfirmed by pulse oximetry reading and clinical signs, she was slowly turned to supine position. But, suddenly, ST-segment depression and low amplitude developed in electrocardiogram and systolic blood pressure was depressed to below 60 mmHg. Therefore, she was rapidly retuned to right lateral position, and ST-segment and systolic blood pressure recoverd. On the next time, although she was slowly turned to the right semi-lateral position, there was almost no circulatory failure. A bronchial tube was intubated in her left bronchia under bronchoscope. We should remember that the preparation of percutaneous cardiopulmonary support (PCPS) should be considered as a means of protection against cardiovascular collapse or airway obstruction perioperatively.

Yokoyama O, Yoshiyama M, Namiki M, de Groat WC. · Department of Pharmacology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15261, USA. · Exp Neurol. · Pubmed #11312567 No free full text.

Abstract: Previous studies showed that bladder hyperactivity after cerebral infarction in Sprague-Dawley (SD) rats was mediated in part by D2 dopaminergic and NMDA glutamatergic mechanisms. In the present experiments, the interaction between dopaminergic and glutamatergic excitatory mechanisms in the control of bladder and external urethral sphincter (EUS) reflexes was investigated in urethane-anesthetized sham-operated (SO) and cerebral-infarcted (CI) SD rats. Occlusion of the left middle cerebral artery or a sham operation was performed under halothane anesthesia. Two hours after either of the two procedures, rats were anesthetized with urethane. Dizocilpine, an N-methyl-d-aspartate (NMDA) glutamatergic antagonist, was administered intravenously in doses of 0.3 or 3 mg/kg to CI rats and 3 mg/kg to SO rats. These doses completely inhibited bladder and EUS activity. The effects of apomorphine (a dopamine agonist with greater efficacy at D2 than D1 receptors) or quinpirole (a selective D2 dopamine receptor agonist) were examined on the dizocilpine-induced depression of bladder contractions and EUS EMG activity. Apomorphine did not antagonize the dizocilpine depression of EUS activity, but it did reestablish the micturition reflex after dizocilpine blockade and did increase the amplitude of bladder contractions and voided volume in a dose-dependent manner (0.0001-10 mg/kg, iv), in both CI rats and SO rats pretreated with dizocilpine. There were no differences between SO rats and CI rats in the apomorphine responses in rats pretreated with doses of 0.3 or 3 mg/kg dizocilpine. A larger dose of dizocilpine (10 mg/kg) did not affect the bladder contractions after apomorphine administration. Quinpirole (0.001-1 mg/kg, iv) also partially reversed the dizocilpine depression of bladder activity in SO and CI rats. These results indicate that NMDA glutamatergic and D2 dopaminergic mechanisms exert independent excitatory influences on bladder activity in both SO and CI rats. D2 dopamine receptor agonists can reverse the effect of NMDA receptor blockade on bladder activity but were ineffective in reversing the block of sphincter activity.