SUMMARY Serum cardiac enzyme levels (CK, LDH, SCOT) were estimated and the ECG recorded for 4 days following admission of 288 patients (Group I) to a stroke intensive care unit. Sixty-four of these patients, subsequently found not to have strokes, served as controls. Mean serum levels of all 3 cardiac enzymes were elevated in 8% of the 224 patients with stroke. The mean serum enzyme levels in patients with transient ischemic attacks (TIA) did not differ from controls.In a second group of 230 patients with stroke (Group II) serum CK levels were measured and the isoenzymes were fractionated to determine the tissue source of the enzymes. One hundred and one patients had raised total CK values and 25 of these (11%) had raised CK-MB (heart) iso-enzyme, the remainder having CK-MM (skeletal muscle) fraction. No serum CK-BB (brain) iso-enzyme was detected in any patient. Patients with positive serum levels of CK-MB had more evidence of acute myocardial ischemia on ECG (p < 0.05), and more cardiac arrhythmias (p < 0.001) than those with normal CK levels. Scattered areas of myocytolysis were found in the myocardium at autopsy in one patient.The acute rise in serum cardiac enzymes which we have recorded in the initial stages of stroke suggest that acute myocardial involvement is a commoner complication than is generally recognized. Also, since the CK-MB rises were modest and progressive, it is more likely that this acute myocardial dysfunction is a consequence, rather than a cause, of the acute cerebrovascular lesion.
Electronic excitation spectra (0< hco <4 eV) of an ultrathin Cs/GaAs(110) interface have been measured at various stages of development with electron-energy-loss spectroscopy. Spectral features which appear as a function of Cs coverage clearly identify the semiconductor-to-metal transition. The semiconducting interface observed up to one Cs layer is characterized as a highly correlated electronic system-a two-dimensional Mott insulator. Interfacial metallization upon Cs multilayer growth is identified by a metallic-excitation continuum and a collective excitation related to the Cs surface plasmon.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.