Clinical assessment of noninvasive intracranial pressure absolute value measurement method

Ragauskas, Arminas; Matijošaitis, Vaidas; Žakelis, Rolandas; Petrikonis, Kęstutis; Rastenytė, Daiva; Piper, Ian; Daubaris, Gediminas

doi:10.1212/wnl.0b013e3182574f50

Cited by 99 publications

(90 citation statements)

References 31 publications

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“…4 Absolute ICP noninvasive measurements of hundreds of healthy volunteers, and neurologic and traumatic brain injury patients showed that our technology can be used on more than 96% of individuals independently of age, gender, or intracraniospinal pathology. Physiologic findings 1,4,6 of OA reaction to ICP and pressure on the orbit fully support conclusions of an anatomical study, 5 which showed that the intracranial course of OA may be absent in just 5% of individuals. The authors assume that extracranial OA blood flow is independent of ICP.…”

supporting

confidence: 66%

“…1 We respectfully disagree with the assumption that "pressure on the orbit does not balance transmural pressure in the segments of ophthalmic artery (OA)." Statistically significant evidence-based results of clinical 1,4 and healthy volunteer 5 studies show that this assumption has no scientific background. Dr. Heyreh 5 demonstrated that intracranial segment (IOA) of the OA is absent in 5% of humans.…”

mentioning

confidence: 92%

“…This method is accurate and sensitivity and specificity are much higher compared with other approaches. 1,6,7 Blood flow in both segments of the OA depends on ICP, ambulatory blood pressure, heart rate, intraocular pressure, intraorbital pressure, and other factors. 1 The benefit of our method is in the equilibration of ICP with Pe.…”

mentioning

confidence: 99%

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Clinical Assessment of Noninvasive Intracranial Pressure Absolute Value Measurement Method

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confidence: 66%

mentioning

confidence: 92%

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Clinical Assessment of Noninvasive Intracranial Pressure Absolute Value Measurement Method

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et al. 2013

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“…Obtaining CSF for analysis may be the only way to confirm subarachnoid hemorrhage, meningitis and neuro-inflammatory diseases (Ragauskas et al, 2012).…”

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confidence: 99%

Common Misconceptions of Lumbar Puncture Complications Among Parents in the Eastern Region of the Kingdom of Saudi Arabia.

Alnajim¹

2017

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“…Blood flow in both segments of the OA depends on ICP, ambulatory blood pressure, heart rate, intraocular pressure, intraorbital pressure, and other factors. 1 The benefit of our method is in the equilibration of ICP with Pe. The balance ICP 5 Pe is not dependent on influential factors.…”

mentioning

confidence: 99%

Migraine headache is present in the aura phase: A prospective study

Wilkins¹

2013

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The authors assume that extracranial OA blood flow is independent of ICP. We disagree. Both adult and pediatric work in the last decade demonstrated the effect and correlation of ICP on distal blood vessels. [2][3][4][5] In 2009, we measured central retinal artery and vein blood flow velocities by spectral Doppler imaging in awake, supine children and determined the velocity of blood flow is reduced by elevated ICP.5 Our method is noninvasive and can be performed without anesthesia on children.We also have safety concerns. Transcranial spectral Doppler imaging through bone necessitates the use of higher Doppler power than ocular Doppler imaging. The authors' diagram (figure 1) places the transcranial Doppler probe precariously close to the lens, but does not publish powers used. Their method would only be applicable in alert and cooperative adults. In addition, applying prolonged pressure to the globe can reduce central retinal artery blood flow and may result in vision loss. Blood flow in both segments of the OA depends on ICP, ambulatory blood pressure, heart rate, intraocular pressure, intraorbital pressure, and other factors. 1 The benefit of our method is in the equilibration of ICP with Pe. The balance ICP 5 Pe is not dependent on influential factors. OA blood flow velocities could be very different in different patients 1 but the balance ICP 5 Pe does not depend on the OA blood flow velocity values. As a result, our method does not need a patient-specific calibration. All "correlation-based" noninvasive ICP measurement approaches cannot be used for absolute ICP value measurements because they need patient-specific calibration, which is impossible.Our 2-depth transcranial Doppler technology complies with all safety standards. The maximum value of Pe is 50 mm Hg and so Pe is applied to the orbit for just 90 seconds. We diagnosed vision changes after 115 snapshot ICP measurements. Experts have agreed that our technology has no influence on vision impairment.

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Clinical assessment of noninvasive intracranial pressure absolute value measurement method

Abstract: The proposed noninvasive ICP measurement method is precise and accurate compared with gold standard CSF pressure measured via lumbar puncture.

Cited by 99 publications

References 31 publications

Clinical Assessment of Noninvasive Intracranial Pressure Absolute Value Measurement Method

Clinical Assessment of Noninvasive Intracranial Pressure Absolute Value Measurement Method

Common Misconceptions of Lumbar Puncture Complications Among Parents in the Eastern Region of the Kingdom of Saudi Arabia.

Migraine headache is present in the aura phase: A prospective study

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