Acta clinica Croatica, Vol. 39 No. 4, 2000.
Izlaganje sa skupa
Effect of Breath Holding on Spectral Doppler Display at Internal Carotid Artery Bifurcation
Nikola Barić
Sažetak
Hemodynamic events in the area of terminal internal carotid artery bifurcation play an important role in the investigation of brain physiology and pathology. The aim of the study was to contribute to the present understanding of the relation between blood velocity in the bifurcation components, and pressure and structural changes at the local level, crucial for the development of apex aneurysm. Comparison of transcranial Doppler spectra of the components with the level of hypercapnia, i.e. with the length of conscious breath holding, produced results indicating a high significance of blood velocity in the development of the mentioned pathology. Doppler shift in the ACM component at three measured levels (following apnea of 0-10, 20-30 and 40 seconds) for the peak systolic velocity was 2.1, 2.7 and 2.9 kHz, respectively. The respective values for the ACA component were 1.9, 2.7 and 2.8 kHz. At the first two levels, the respective values for the ACM M1 segment were 2.5 and 3.4 kHz. Special significance was recorded for so-called swerve losses, which occur on sudden change of blood direction into the ACA component. These losses are closely related to blood velocity, and they are essential in the development of aneurysm. Because of ethical norms and potential risk of the experiment, the author performed the measurement on himself and by himself. A low-frequency pulsing probe of 2 MHz with a Multi-Dop P ultrasonic device (DWL - Elektronische Systeme GmbH) was used in the study.
Ključne riječi
Carotid artery, internal, pathology; Cerebrovascular circulation, physiology; Respiration, physiology; Aneurysm, ultrasonography
Hrčak ID:
14990
URI
Datum izdavanja:
1.12.2000.
Posjeta: 1.850 *