Dopplersonographische Diagnose eines erhöhten intrakraniellen Druckes durch Vergleich der Flussgeschwindigkeiten im extra- und intrakraniellen Anteil der Arteria carotis interna

Abstract

Flow measurements in extra- and intracranial sections of the internal carotid arteries are an accurate method for semiquantitative estimation of increased intracranial pressure. This method is superior to the measurement of the RI. Slightly increased intracranial pressures below 20 cm H2O cause an increase of the I/E-ratio above 1, whereas the RI does not change. Moderately increase of the intracranial pressure above 20 cm H2O lowers the I/E-ratio significantly below normal values of 0.8, whereas the RI increases.

Sonographic and Doppler Sonographic Diagnosis of Posthemorrhagic Hydrocephalus

“…Flow measurements in the intracranial and extracranial portion of the internal carotid artery ! Another important possibility for the early detection of increasing intracranial pressure is flow measurements via Doppler sonography in the intracranial and extracranial portion of the internal carotid artery [25]. The extracranial portion of the internal carotid artery corresponds to the petrosal part.…”

“…The intracranial portion corresponds to the cerebral part ( • " Fig. 12a, b) [25]. In the case of increased intracranial pressure, only the cerebral part is compressed while the petrosal part is protected from compression by the petrous part of the temporal bone.…”

“…12a). Without angle correction, the intracranial flow rates are always lower [25]. In the case of increased intracranial pressure, the intracranial part of the internal carotid artery is compressed so that the flow rates increase according to the Bernoulli equation ( • " Fig.…”

“…12b) [14]. Increased maximum intracranial flow rates over the flow rate in the extracranial part indicate increased intracranial pressure [26]. To detect the intracranial increase, extracranial and intracranial flow measurements are performed simultaneously ( • " Fig.…”

“…The increase in the maximum systo- Flussmessungen im intra-und extrakraniellen Anteil der A. carotis interna ! Eine weitere wichtige Möglichkeit zur Früherkennung eines ansteigenden intrakraniellen Druckes sind dopplersonografische Flussmessungen im intrakraniellen und extrakraniellen Anteil der A. carotis interna [25]. Der extrakranielle Anteil der A. carotis interna entspricht der pars petrosa.…”