15 research outputs found
Typical heart rate variation.
<p>(A) A heart rate variation in a healthy volunteer. (B) A pressure increase of 4 mmHg per pressure Pe(t) step (time period of approximately 30 sec each) was used on the ocular globe from 0 mmHg to 48 mmHg.</p
Histogram of HR<sub>diff</sub> (parameter for the detection of the oculocardiac reflex) for subjects from all groups and 870 external pressure steps applied during all of the non-invasive intracranial pressure measurements.
<p>Histogram of HR<sub>diff</sub> (parameter for the detection of the oculocardiac reflex) for subjects from all groups and 870 external pressure steps applied during all of the non-invasive intracranial pressure measurements.</p
Example spectrograms of pulse waves of blood flow in the ophthalmic artery collected by a transcranial Doppler using different external pressure steps.
<p>(A) 0 mmHg; (B) 48 mmHg. HR—heart rate.</p
Protocol parameters for the non-invasive intracranial pressure measurement according to group.
<p>Protocol parameters for the non-invasive intracranial pressure measurement according to group.</p
Demographic data of the included subjects in this retrospective study.
<p>Demographic data of the included subjects in this retrospective study.</p
Schematic representation of the non-invasive intracranial pressure (ICP) measurement equipment Vittamed 205.
<p>(A) Relevant orbit and brain anatomy in contact with the ICP measurement device. (B) Block diagram of the system control unit. ICA—internal carotid artery; IOA—intracranial part of the ophthalmic artery; EOA—extracranial part of the ophthalmic artery; TCD—transcranial Doppler; Pe—external pressure applied to the ocular globe.</p
Heart rate (HR) variation at every external pressure step (Pe) applied on the ocular globe in the case of a 10% decrease in the MHR compared to the BHR.
<p>(A) Healthy subject. (B) Glaucoma patient. (C) Healthy subject. (D) Healthy subject.</p