The location of the boundaries among the endometrium, inner myometrium (dark), and outer myometrium (intermediate or bright) were compared on T2-weighted magnetic resonance (MR) and intravaginal ultrasound (US) images obtained within 24 hours of each other. Twelve women with normal reproductive cycles underwent a total of 21 pairs of examinations. The endometrium, inner myometrium (junctional zone), and outer myometrium were measured by three independent observers. The endometrial thickness was thinner with MR imaging (6.5 mm with MR imaging vs 7.9 mm with US early in the cycle [P = .001]; 9.9 mm with MR imaging vs 11.3 mm, respectively, late in the cycle [P = .045]). The junctional zone was thicker with MR imaging (4.4 vs 2.3 mm early [P less than .001]; 3.9 vs 2.2 mm late [P = .003]). The combined thickness of the endometrium and junctional zone was thicker with MR imaging (15.5 vs 12.7 mm early [P = .002]; 17.3 vs 15.8 mm late [P = .064]), confirming that the boundary between the junctional zone and outer myometrium is different with MR imaging versus US.
This report deals with experimental attempts to alter the blood supply of the dog's heart in such manner as to render it less susceptible to the infarctions which follow sudden occlusion of the anterior descending branch of the left coronary artery. 1 Inasmuch as the ultimate objective of this work is its application to those conditions in the human heart which are associated with myocardial ischemia (angina pectoris of vascular origin generally due to sclerotic or thrombotic coronary occlusion), three practical desiderata were kept in mind: (a) the production of an adequate functional increase in the blood supply to the heart; (b) the employment of a method requiring a minimum of manipulation; (c) the attainment of the desired results after a minimum lapse of time.In 1921, Gross (1) showed that there are three vascular mechanisms in the blood supply to the human heart which probably serve as compensatory means to ward off the results following coronary artery narrowing or occlusion. The first and most important of these mechanisms is a gradual and consistent widening of intramyocardial anastomotic channels which occurs with increasing age. A conspicuous portion of these anastomotic channels are situated in the interventricular septum. The second compensatory mechanism is the age period development of rami telae adiposae, vessels which lie in the epicardial mantle and anastomose with the myocardial vascular ramifications on the one hand, and with periaortic * Aided by grants from the Lucius N. Littauer and Walter W. Naumburg Funds.1 This vessel will be referred to in this report as the left anterior descending branch. 91on May 7, 2018 jem.rupress.org Downloaded from
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