A novel temporal correlation technique was used to map the first-pass transit of iodinated contrast agents through the brain. Transit profiles after bolus injections were measured with dynamic computed tomography (CT) scanning (1 image/s over 50 s). A rabbit model of focal cerebral ischemia (n = 6) was used, and dynamic CT scans were performed at 30, 60, 90, and 120 min postocclusion. Within the ischemic core, no bolus transit was detectable, demonstrating that complete ischemia was present after arterial occlusion. In the periphery of the ischemic distribution, transit dynamics showed smaller peaks, broadened profiles, and overall delay in bolus transit. A cross-correlation method was used to generate maps of delays in ischemic transit profiles compared with normal transit profiles from the contralateral hemisphere. These maps showed that penumbral regions surrounding the ischemic core had significantly delayed bolus transit profiles. Enlargement of the ischemic core over time (from 30 to 120 min postocclusion) was primarily accomplished by the progressive deterioration of the penumbral regions. These results suggest that (a) temporal correlation methods can define regions of abnormal perfusion in focal cerebral ischemia, (b) peripheral regions of focal cerebral ischemia are characterized by delays in bolus transit profiles, and (c) these regions of bolus transit delay deteriorate over time and thus represent a hemodynamic penumbra.
Zusammenfassung ?rztliche Diagnosen f?r Schulterschmerzen basieren auf einer pathoanatomischen Terminologie und k?nnen nur beschr?nkt physiotherapeutische Interventionen leiten. Diagnostische Bezeichnungen sollen zu einer spezifischen Behandlung f?hren. Wird der Fokus auf die Beschreibung der menschlichen Bewegung ge?ndert, ergibt sich ein pathokinesiologisches Modell. Die Identifikation charakteristischer Bewegungsbeeintr?chtigungen k?nnte sich als physiotherapeutisches Klassifikationsschema eignen. Das Ziel der Studie bestand darin, ein spezifisch physiotherapeutisches Klassifikationsschema zu entwickeln, das den Bed?rfnissen und Kompetenzrahmen von Physiotherapeuten gerecht wird. Dazu wurden in einem 4-Runden-Delphi-Design deutschsprachige Physiotherapeuten mit Expertise bei der Behandlung von Schulterschmerzen zu einem entsprechenden m?glichen Klassifizierungsmodell befragt. Basierend auf den Ergebnissen wurde ein physiotherapeutisches Klassifikationsmodell entwickelt. Diese Klassifizierung f?hrt weg von der alleinigen Identifizierung einer schmerzhaften Struktur hin zu einer bewegungsbezogenen Diagnostik und leitet somit direkt die Behandlung.
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.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.