Biomedical subjects
O M Reinmuth
Publications and source records attributed to O M Reinmuth.
Total cerebral blood flow and metabolism in human brain stem disease.
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Carbon dioxide and cerebral circulatory control. I. The extravascular effect.
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Carbon dioxide and cerebral circulatory control. II. The intravascular effect.
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Carbon dioxide and cerebral circulatory control. 3. The effects of brain stem lesions.
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Some hemodynamic aspects of regional brain ischemia.
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Studies on cerebral lactate and pyruvate extraction in normal subjects.
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Experimental evidence of a different mode of action of hypercapnia and hypoxia on cerebral vessels.
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Intracranial bypass surgery for cerebral arterial disease and the responsibility of the practicing physician.
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Cerebral blood flow studies in man using recirculation corrected height/area (H/A) computations for intravenous injection of 133Xenon.
Our height/area (recirculation-corrected) non-invasive cerebral blood flow method compares well with k1 values and k average as determined from k1, k2, p1 and p2 by Obrist computations. The height/area method provides regional flow measurements with less variability than k1 due to low regional head counts, head motion and end-tidal gas sample variations. Derivation of the mathematical model is for a single flow compartment and suited for tomographic measurements such as PET. Collimated detector data using our computation provides a good approximation of flow even for multiple compartments. Our approach permits a lower counting rate by either a smaller isotope dose or better detector collimation than multicompartment curve fitting methods.
Clinical experience with the use of xenon-enhanced CT blood flow mapping in cerebral vascular disease.
Cerebral blood flow mapping with the xenon-enhanced/CT method has become a useful clinical tool in the management of patients with occlusive cerebral vascular disease. Studies involving 4-5 minutes of inhaling a xenon/oxygen mixture (less than or equal to 35%) can now be performed routinely with acceptable patient tolerance and compliance. Four cases with acute and chronic ischemic injuries are reported here to illustrate the manner in which this method has been used to characterize flow pattern in such patients and the relevance of this flow information to clinical patient management.
Recurrent cerebral infarctions in two brothers with antiphospholipid antibodies that block coagulation reactions.
Inhibitors blocking coagulation reactions, often called lupus anticoagulants, are readily identifiable but rarely considered as risk factors for cerebral infarction. These inhibitors are inconsistently found in a number of diseases (often autoimmune) and after treatment with ceretain drugs and appear to be closely associated with, or identical to, antibodies to certain phospholipids. We have observed two brothers with these inhibitors who both experienced recurrent cerebral infarctions. Such familial occurrence has rarely been reported. In addition, some other family members were found to have depressed factor XII levels. Using the technique of double immunodiffusion, we found that the serum from these brothers formed precipitin lines against certain phospholipid substrates, lending further support to the antiphospholipid nature of this inhibitor.
The relation between cerebral oxygen consumption and cerebral vascular reactivity to carbon dioxide.
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Editorial: Prologue to guidelines for stroke care.
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The measurement of cerebral blood flow in the rat.
Cerebral blood flow (CBF) was determined in the rat under 70% nitrous oxide anesthesia and pentobarbital anesthesia. The application of the Fick principle technique of Kety et al. was modified utilizing 133Xe infused intravenously steadily for 30 seconds, at which time the animal was decapitated and the head frozen in liquid nitrogen. A prior femoral artery to femoral vein shunt was led through a polyethylene catheter of 0.13 ml volume. This catheter passed as a coil in a NaI crystal well-counter with the arterial 133Xe concentration curve recorded by a ratemeter-recorder system. The results of the hemispheric blood flow (HBF) were: under 70% nitrous oxide anesthesia in normocapnia (Paco2 38 mm Hg), 86 +/- 15 ml/100 gm per minute; with hypocapnia (Paco2 20 mm Hg), 40 +/- 5 ml/100 gm per minute; with hypercapnia (Paco2 63 mm Hg), 187 +/- 10 ml/100 gm per minute; and with pentobarbital anesthesia (Paco2 38 mm Hg), 41 +/- 8 ml/100 gm per minute.
Xenon enhanced CT for analysis of cerebral integrity, perfusion, and blood flow.
Enhancement of the brain substance for CT evaluation using inhaled Xenon is confirmed. This technique was applied to the study of the normal and the embolized adolescent baboon. Healthy cerebral tissue enhances symmetrically, while abnormal areas show significantly diminished enhancement. At maximal enhancement, an indication of gross comparative cerebral perfusion to obtained. By obtaining serial CT scans over a 10 minute time interval, the clearance rate of Xenon (cerebral blood flow) may be evaluated. Xenon-enhanced CT enables a visual and numerical analysis of both brain morphology and physiology.