The Effect of Different End-tidal Carbon-dioxide Levels on Cerebral CO2 Vasoreactivity and the Stiffness of Systemic Arteries During Propofol Anesthesia

Summary

Purpose: The purpose of this study is to examine the effect of different carbon-dioxide concentrations on cerebral CO2 sensitivity and the resistance and stiffness of systemic arteries during anesthesia with target-controlled infusion anesthesia using intravenous propofol. Propofol is a widely and commonly used intravenous anaesthetic, that is mainly used for the induction of general anesthesia and the maintenance of total intravenous anaesthesia (TIVA). Changes in the velocity of cerebral blood flow and arterial stiffness due to the different exhaled carbon-dioxide concentrations will allow us to conclude how propofol affects these parameters during the course of the narcosis. Instruments: An ultrasound device called transcranial doppler (TCD) is used to measure the velocity of blood flow within a main artery located inside the skull. A tonometry device named SphygmoCor is used to assess the pressure wave proceeding in the radial artery, from which the stiffness of the systemic vessels can be concluded. Measurements: \- Examinations with the ultrasound and tonometry devices are carried out once before the operation, three times during the intervention, with different exhaled CO2 values and once after the operation is completed. Hypothesis: \- Propofol alters cerebral carbon-dioxide sensitivity and the stiffness of systemic arteries during TCI anaesthesia.

Timeline

Start

2014-01

Primary completion

2016-12

Completion

2016-12

Publications

• Results Fulesdi B, Limburg M, Bereczki D, Kaplar M, Molnar C, Kappelmayer J, Neuwirth G, Csiba L. Cerebrovascular reactivity and reserve capacity in type II diabetes mellitus. J Diabetes Complications. 1999 Jul-Aug;13(4):191-9. doi: 10.1016/s1056-8727(99)00044-6.
• Results McCulloch TJ, Thompson CL, Turner MJ. A randomized crossover comparison of the effects of propofol and sevoflurane on cerebral hemodynamics during carotid endarterectomy. Anesthesiology. 2007 Jan;106(1):56-64. doi: 10.1097/00000542-200701000-00012.
• Results Lan YC, Shen CH, Kang HM, Chong FC. Pulse transit time reveals drug kinetics on vascular changes affected by propofol. Comput Methods Biomech Biomed Engin. 2012;15(9):949-52. doi: 10.1080/10255842.2011.567981. Epub 2011 May 24.
• Results Strebel S, Kaufmann M, Guardiola PM, Schaefer HG. Cerebral vasomotor responsiveness to carbon dioxide is preserved during propofol and midazolam anesthesia in humans. Anesth Analg. 1994 May;78(5):884-8. doi: 10.1213/00000539-199405000-00009.
• Results Holzer A, Winter W, Greher M, Reddy M, Stark J, Donner A, Zimpfer M, Illievich UM. A comparison of propofol and sevoflurane anaesthesia: effects on aortic blood flow velocity and middle cerebral artery blood flow velocity. Anaesthesia. 2003 Mar;58(3):217-22. doi: 10.1046/j.1365-2044.2003.03041.x.
• Results Previgliano IJ. Assessment: transcranial Doppler ultrasonography: report of the Therapeutics and Technology Assessment Subcommittee of the American Academy of Neurology. Neurology. 2004 Dec 28;63(12):2457-8; author reply 2457-8. No abstract available.
• Juhasz M, Pall D, Fulesdi B, Molnar L, Vegh T, Molnar C. The effect of propofol-sufentanil intravenous anesthesia on systemic and cerebral circulation, cerebral autoregulation and CO2 reactivity: a case series. Braz J Anesthesiol. 2021 Sep-Oct;71(5):558-564. doi: 10.1016/j.bjane.2021.04.002. Epub 2021 Apr 23.

Drugs

Indications

No indication recorded.