• rats
  • Previously, we demonstrated that i.v. infusion of magnesium sulphate (MgSO 4 ) alone, or in the presence of vasoconstrictors, caused increases in flow and conductance in the common carotid, internal carotid and hindquarters vascular beds, in conscious rats. (wiley.com)
  • CIRCULATION
  • With his colleague Ole Munck he began in the 1950s to use radioactive isotopes for the measurement of the blood circulation in the brain, and in the beginning of the 1960s he together with David H. Ingvar from University of Lund began the development of methods for regional measurements on the brain with krypton-85 and xenon-133 isotopes. (wikipedia.org)
  • Stroke
  • More importantly, there were three kinds of dynamic changes of CCs during acute stroke: persistent CC, impermanent CC, and transient CC, respectively, related to different distributions of regional blood flow. (spiedigitallibrary.org)
  • Typically hemorrhagic stroke is caused by two types of weakened blood vessel: aneurysms and arteriovenous malformations (AVMs). (wikipedia.org)
  • The researchers suggested a thorough examination for evidence of silent stroke in all severely anemic children in order to facilitate timely intervention to ameliorate the potential brain damage.Sickle cell anemia: is an autosomal recessive genetic blood disorder caused in the gene (HBB gene) which codes for hemoglobin (Hg) and results in lowered levels. (wikipedia.org)
  • characteristic
  • The results support the hypothesis of (at least) three pathophysiologic variants of POTS distinguished by peripheral blood flow related to characteristic changes in regional circulations. (physiology.org)
  • In a clinical context, orgasm is usually defined strictly by the muscular contractions involved during sexual activity, along with the characteristic patterns of change in heart rate, blood pressure, and often respiration rate and depth. (wikipedia.org)
  • measurement
  • The blood flow rates of the rapid and slow compartments were calculated by the Kety-Schmidt formula along with 95% confidence limits for each measurement. (ahajournals.org)
  • correlation
  • Changes of LCBF have no correlation with changes of systemic blood pressure (SAP). (ahajournals.org)
  • PET studies seem to indicate that there is a correlation between blood flow in the pontine tegmentum and REM sleep Pontine waves, (PGO waves) or P-waves, are brain waves generated in the pontine tegmentum. (wikipedia.org)
  • responses
  • Accordingly, we tested whether neuropsychological function and brain blood flow responses to cognitive challenges among prehypertensive individuals would predict subsequent progression of BP. (ahajournals.org)
  • The responses to MgSO 4 in the presence of ET-1 showed considerable regional heterogeneity with blood flow increasing (e.g. skeletal muscle), decreasing (e.g. stomach) or not changing (e.g. kidney). (wiley.com)
  • patterns
  • We propose that postural tachycardia is related to thoracic hypovolemia during orthostasis but that the patterns of peripheral blood flow relate to different mechanisms for thoracic hypovolemia. (physiology.org)
  • pressure
  • However, lowering blood pressure (BP) does not uniformly reverse cognitive decline, suggesting that high BP per se may not cause cognitive decline. (ahajournals.org)
  • BBB was impermeable to gadoteridol 150 min after CA. CBF in the 12 min CA group was blood pressure passive at 60 min assessed via infusion of epinephrine. (pubmedcentralcanada.ca)
  • investigate
  • These findings suggest the need for additional, larger studies to investigate the effects of acetylcholinesterase inhibitors on regional cerebral blood flow. (springer.com)
  • Therefore, the objective of the present study was to investigate the regional and subregional changes in haemodynamics in response to the vasoconstrictor peptide endothelin-1 (ET-1) and MgSO 4 in more detail, using the coloured microsphere reference technique. (wiley.com)
  • high
  • The role of TCD in predicting symptomatic cerebral vaso-spasm is limited to the cases in which very high blood flow velocities are detected . (springer.com)
  • There was significantly decreased blood flow in POTS patients with high P v ( middle right ) compared with control by ×2 and significantly increased leg blood flow in normal-P v POTS patients ( bottom left and bottom right ) compared with control subjects. (physiology.org)
  • Important advantages of this technique are its noninvasiveness (since magnetically labeled protons in blood are used as a tracer) and short acquisition time at high magnetic field strengths (3.0 T) [ 18 ]. (hindawi.com)
  • magnitude
  • Application of a three-compartment analysis to these curves permitted estimation of the magnitude of shunting along with gray and white matter flow in the lesion. (ahajournals.org)
  • suggests
  • This suggests that there are (at least) two subgroups within the normal P v group: a group of patients with increased blood flow and a group of patients with unchanged blood flow compared with control. (physiology.org)
  • present
  • Pulse-height analysis at each site allowed separation of count values for the isotopes, and, after correction for collimator distortion, these values were assumed to be proportional to the respective blood flows which were present below each site at the respective time of injections. (dtic.mil)
  • Volume
  • Blood volume tended to be decreased in LFP compared with control subjects. (physiology.org)
  • Thoracic blood volume decreased, whereas splanchnic, pelvic, and leg blood volumes increased, for all subjects during orthostasis but were markedly lower than control for all POTS groups. (physiology.org)
  • Pelvic blood volume was increased in HFP only. (physiology.org)
  • exposure
  • Diagnosis is based upon a combination of symptoms, history of tick exposure, and possibly testing for specific antibodies in the blood. (wikipedia.org)
  • increase
  • 1 2 3 4 However, conflicting data regarding the accuracy of this method were recently presented by Harris and Bailey, 5 indicating that hypercapnia induced during general anesthesia made a very small increase in rSO 2 despite the more than doubling of the middle cerebral artery flow velocity. (ahajournals.org)
  • cells
  • The blood cells in sickle cell disease are abnormally shaped (sickle-shaped) and may form clots or block blood vessels. (wikipedia.org)