526
|
Yao H, Sadoshima S, Shiokawa O, Fujii K, Fujishima M. Renal blood flow in acute cerebral ischemia in spontaneously hypertensive rats: effects of alpha- and beta-adrenergic blockade. Stroke 1987; 18:629-33. [PMID: 2884758 DOI: 10.1161/01.str.18.3.629] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The influences of acute cerebral ischemia on renal hemodynamics were examined in spontaneously hypertensive rats in which cerebral ischemia was induced by bilateral carotid artery occlusion. Renal and cerebral blood flow were measured with a hydrogen clearance technique. Either phenoxybenzamine (0.5 mg/kg body wt) or propranolol (2 mg/kg) was given i.v. immediately after ischemia was induced to examine the drugs' effects on cerebral and renal hemodynamics. One hour after ischemia, cerebral blood flow was markedly reduced to 5, 3, and almost 0% of the preischemic value in the untreated, phenoxybenzamine-treated, and propranolol-treated rats, respectively. In contrast, renal blood flow at that time was decreased to 65, 88, and 67%, respectively. The calculated renal vascular resistance was similarly increased to 151% in the untreated and 136% in the propranolol-treated rats, but decreased to 82% in the phenoxybenzamine-treated rats. The present results indicate that in acute cerebral ischemia renal blood flow was considerably decreased with concomitant increased renal vascular resistance, and that such reduction in renal blood flow was minimized by alpha-adrenergic blockade but not by beta-blockade. It is concluded that activation of the alpha-adrenergic system in acute cerebral ischemia causes renal vasoconstriction.
Collapse
|
527
|
Kuroki T, Matsumoto T, Hirano M, Kagoshima H, Yao H, Uchimura H, Nakamura K, Nakahara T. Long-lasting effect of systemically administrated caerulein on monoaminergic neuronal pathways in rat brain. Neuropeptides 1987; 9:169-76. [PMID: 2437491 DOI: 10.1016/0143-4179(87)90055-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The effect of systemically administrated cholecystokinin analog, caerulein, on monoaminergic neurons was examined in discrete regions of rat brain. A single injection of caerulein (400 micrograms/kg, i.p.) significantly elevated 5-hydroxyindoleacetic acid (5HIAA) levels in the prefrontal cortex lateral field, nucleus accumbens, tuberculum olfactorium and striatum after 2 hours, together with a significant increase in striatal serotonin (5HT). Moreover, the time-course study showed that the caerulein-induced increase in both 5HIAA and 5HT levels lasted even for 24 hours, and their levels tended to recover to the control values gradually. This time-dependent change was not found in the other monoamines and their metabolites. These results suggest a long-lasting action of caerulein on 5HT neurons in specific regions of rat brain.
Collapse
|
528
|
Yao H, Sadoshima S, Fujii K, Kusuda K, Ishitsuka T, Tamaki K, Fujishima M. Cerebrospinal fluid lactate in patients with hepatic encephalopathy. Eur Neurol 1987; 27:182-7. [PMID: 3113961 DOI: 10.1159/000116153] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cerebrospinal fluid (CSF) lactate and pyruvate concentrations were determined in 16 patients with hepatic encephalopathy before and/or after treatment. CSF lactate was significantly increased to 1.92 +/- 0.11 mmol/l in hepatic encephalopathy before the treatment in comparison to 1.40 +/- 0.05 mmol/l in control subjects. In 9 of 11 patients with moderate or stage 2 encephalopathy, CSF lactate levels were below 2 mmol/l. In contrast, in 4 of 5 patients with stage 3-4 encephalopathy, CSF lactate levels were higher than 2 mmol/l. CSF lactate was decreased with the recovery of neurological symptoms by the treatment. These findings indicate that CSF lactate levels reflect the severity of metabolic impairment of the brain. Hypocapnia was frequently observed in these encephalopathic patients, and arterial PCO2 correlated inversely with CSF lactate and linearly with CSF HCO3-, suggesting that CSF lactic acidosis contributes to hyperventilation in hepatic encephalopathy. It is concluded from present results that metabolic disorder of neuronal cells might be one of the important factors for the development of hepatic encephalopathy.
Collapse
|
529
|
Fujishima M, Ibayashi S, Fujii K, Yao H, Sadoshima S. Effects of long-term antihypertensive treatment on cerebral, thalamic and cerebellar blood flow in spontaneously hypertensive rats (SHR). Stroke 1986; 17:985-8. [PMID: 3764972 DOI: 10.1161/01.str.17.5.985] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Cerebral blood flows (CBF) were measured in the parietal cortex, the thalamus and the cerebellum by the hydrogen clearance technique in anesthetized spontaneously hypertensive rats, of which hypertension was treated for 16 weeks (long-term) or 8 weeks (short-term) with antihypertensive agents of hydralazine and guanethidine. As compared to non-treated control animals, CBF in the three regions were significantly increased while the calculated cerebrovascular resistances (CVR) were decreased in hypertension-treated animals. Such CBF and CVR changes were greater in SHR with long-term than short-term therapy. Both an increase in CBF and a decrease in CVR were closely related to a fall in the blood pressure. From the present results, it was concluded that earlier and longer treatment of hypertension could lessen or even prevent the increased CVR due to the hypertensive vascular changes, and increase CBF as a result.
Collapse
|
530
|
Sadoshima S, Fujii K, Yao H, Kusuda K, Ibayashi S, Fujishima M. Regional cerebral blood flow autoregulation in normotensive and spontaneously hypertensive rats--effects of sympathetic denervation. Stroke 1986; 17:981-4. [PMID: 3764971 DOI: 10.1161/01.str.17.5.981] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The present study was designed to investigate the effect of acute sympathetic denervation on the regional cerebral blood flow (CBF) autoregulation during acute elevation of blood pressure in spontaneously hypertensive rats (SHR) and normotensive Wistar Kyoto rats (WKY). CBF to the parietal cortex and thalamus was measured by the hydrogen clearance method and, to test autoregulation, systemic arterial blood pressure was elevated by intravenous infusion of phenylephrine. Superior cervical ganglia were removed on both sides to interrupt sympathetic innervation in the deeper structures of the brain. Acute bilateral sympathetic denervation did not alter the resting blood pressure or CBF in either SHR or WKY. In innervated SHR, resting mean arterial pressure (MAP) was 165 +/- 5 mm Hg (mean +/- SEM) and the upper limit of autoregulation in the cortex was 210 +/- 3 mm Hg, which was significantly lower than that in the thalamus (229 +/- 3 mm Hg, p less than 0.02). In bilaterally denervated SHR, the upper limits were lowered to 193 +/- 4 mm Hg in the cortex (p less than 0.02 vs. innervated SHR) and to 207 +/- 5 mm Hg in the thalamus (p less than 0.02 vs. innervated). In WKY, resting MAP was approximately 55 mm Hg lower than that in SHR. Acute denervation reduced the upper limits from 142 +/- 3 mm Hg to 130 +/- 4 in the cortex (p less than 0.05) and from 158 +/- 4 to 145 +/- 4 in the thalamus (p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|
531
|
Sadoshima S, Fujii K, Yao H, Ibayashi S, Fujishima M. Effect of chronic sympathetic denervation on cerebrovascular hypertrophy during the development of hypertension in rats. Brain Res 1986; 379:205-9. [PMID: 3742220 DOI: 10.1016/0006-8993(86)90772-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The present study was designed to examine the trophic effect of sympathetic nerves on cerebrovascular hypertrophy in developmental hypertension. Unilateral superior cervical ganglionectomy was performed in spontaneously hypertensive rats at 4 weeks of age, and wall-to-lumen ratios of cerebral arteries were determined at 5 weeks, 2 months or 5 months after denervation. To estimate the thickness of the vessel wall, a freeze substitution technique was used for the preparation of cerebral arteries. Basal mean arterial blood pressure measured through cannulated femoral artery was 127 +/- 2, 146 +/- 7 and 168 +/- 6 mm Hg (mean +/- S.E.M.) at 9 weeks, 3 months and 6 months of age, respectively. The wall-to-lumen ratios in the denervated and innervated hemispheres were 0.124 +/- 0.004 and 0.129 +/- 0.005 at 9 weeks, 0.127 +/- 0.003 and 0.169 +/- 0.004 (P less than 0.02 vs denervated) at 3 months, and 0.194 +/- 0.007 and 0.222 +/- 0.006 (P less than 0.05 vs denervated) at 6 months. The effect of denervation was more significant in downstream vessels (diameter less than or equal to 100 microns) than larger ones. We conclude that wall-to-lumen ratio is correlated well with a rise in basal blood pressure, and chronic interruption of the sympathetic nerves attenuates normal occurrence of vascular hypertrophy during the development of hypertension.
Collapse
|
532
|
Ibayashi S, Ogata J, Sadoshima S, Fujii K, Yao H, Fujishima M. The effect of long-term antihypertensive treatment on medial hypertrophy of cerebral arteries in spontaneously hypertensive rats. Stroke 1986; 17:515-9. [PMID: 3715953 DOI: 10.1161/01.str.17.3.515] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The effects of antihypertensive treatment on the structural changes of middle cerebral arteries (MCA) were studied quantitatively and morphometrically in young spontaneously hypertensive rats (SHR). Fifteen male SHR, 10 weeks of age, were divided into control and experimental groups. In the experimental group, the animals were administered hydralazine and guanethidine for the following 10 weeks. At the age of 20 weeks, mean arterial blood pressure of experimental animals was 177 +/- 9 mm Hg (mean +/- SD), being significantly lower than that of 195 +/- 12 mm Hg in control ones. Media thickness of large (external diameter greater than or equal to 200 micron) and medium sized MCA (150-200 micron) in treated SHR was 12.3 +/- 2.8 and 6.3 +/- 1.1 micron, respectively, being significantly smaller than that of 14.0 +/- 2.2 and 8.5 +/- 2.6 micron, respectively, in control SHR. The media cross-sectional area and the ratio of media thickness to external diameter were also significantly reduced by antihypertensive treatment. In the smaller vessels (75-150 micron), however, vascular morphometry revealed no difference between the two groups. Long-term antihypertensive treatment during the early phase of hypertension attenuates the development of medial hypertrophy in large cerebral arteries.
Collapse
|
533
|
Aoki K, Miyamoto T, Yao H, Murata H, Oka Y, Maeda S, Yamashita K. [Cavoatrial bypass in obstruction of the inferior vena cava in the hepatic portion through the posterior route of the hepatic caudate lobe]. NIHON GEKA GAKKAI ZASSHI 1986; 87:118-23. [PMID: 3960022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In a 32-year-old Japanese female who had a history of Sjögren's syndrome, the obstruction of the inferior vena cava in the hepatic portion was found associated with Budd-Chiari syndrome. The obstruction of the inferior vena cava was about 6 cm in length by cavography. Cavoatrial bypass grafting was successfully performed with a 16 mm ring reinforced expanded polytetrafluoroethylene graft, which ran behind the caudate lobe of the liver and connected to the right atrium via right pleural cavity. This may be the first report of the posterior route of the hepatic caudate lobe in cavoatrial bypass grafting in Japanese and English literature.
Collapse
|
534
|
Oka Y, Miyamoto T, Murata H, Aoki K, Maeda S, Yamashita K, Yao H, Takanashi S. [A surgical case of thoracic aortic aneurysm complicated by postoperative paraplegia with sensory dissociation--the problems of somatosensory evoked potentials]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 1985; 38:609-13. [PMID: 4068412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
535
|
Yao H, Fukiyama K, Takada Y, Fujishima M, Omae T. Neurogenic hypertension in the Guillain-Barré syndrome. JAPANESE HEART JOURNAL 1985; 26:593-6. [PMID: 3903251 DOI: 10.1536/ihj.26.593] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We report a case of Guillain-Barré syndrome associated with hypertension. The hypertension was related to glossopharyngeal and vagal nerve impairment. Plasma noradrenaline concentration (NA) and plasma renin activity (PRA) were elevated. The possible mechanism of the neurogenic hypertension produced by the sino-aortic denervation is discussed.
Collapse
|
536
|
Oka Y, Miyamoto T, Murata H, Ohashi H, Aoki K, Yamashita K, Kitai K, Yao H. [Intra-graft balloon pumping. A clinical case report]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 1984; 37:602-5. [PMID: 6503088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
537
|
Sakamoto M, Akagi M, Takahashi T, Yao H, Takamatsu H. [Guaiazulene for periodontal disease]. SHIKAI TENBO = DENTAL OUTLOOK 1984; 63:851-5. [PMID: 6591497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
538
|
Yao H, Nishimura Y, Morita E, Watanabe A. [2 cases of hypothyroidism associated with hypertensive cerebral hemorrhage]. FUKUOKA IGAKU ZASSHI = HUKUOKA ACTA MEDICA 1983; 74:658-62. [PMID: 6662476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
539
|
Yao H, Fukiyama K, Kawano Y, Mizumoto K, Toyoshima S, Omae T. Recurrent pheochromocytoma associated with glucagonoma. A case report. ENDOCRINOLOGIA JAPONICA 1983; 30:163-6. [PMID: 6139277 DOI: 10.1507/endocrj1954.30.163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We treated a hypertensive patient with recurrent pheochromocytoma (paraganglioma) associated with glucagonoma. No clinical symptom of glucagonoma was found and it could be detected only by a slight elevation of plasma immunoreactive glucagon (IRG) while the extirpated pancreatic tumor contained much IRG. This case could not be classified as either multiple endocrine neoplasia (MEN) type I or type II.
Collapse
|
540
|
Kobayashi S, Nishijima K, Yao H, Sugi H, Takaya Y, Ikeda T. A case of supernumerary cuspid. ACTA MEDICA OKAYAMA 1981; 35:421-5. [PMID: 6459714 DOI: 10.18926/amo/31257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
541
|
Yao H, Diana JN. Computer simulation model for transient transcapillary fluid exchange. IEEE Trans Biomed Eng 1973; 20:427-33. [PMID: 4754316 DOI: 10.1109/tbme.1973.324216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
542
|
Diana JN, Long SC, Yao H. Effect of histamine on equivalent pore radius in capillaries of isolated dog hindlimb. Microvasc Res 1972; 4:413-37. [PMID: 4635580 DOI: 10.1016/0026-2862(72)90074-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|