Measurement of Hemodynamics During Postural Changes Using a New Wearable Cephalic Laser Blood Flowmeter

Background: Patients with orthostatic hypotension have pathologic hemodynamics related to changes in body posture. A new cephalic laser blood flowmeter that can be worn on the tragus to investigate the hemodynamics upon rising from a sitting or squatting posture was developed. Methods and Results: T...

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Published inCirculation Journal Vol. 73; no. 10; pp. 1950 - 1955
Main Authors Fujikawa, Tetsuya, Tochikubo, Osamu, Kura, Naoki, Kiyokura, Takanori, Shimada, Junichi, Umemura, Satoshi
Format Journal Article
LanguageEnglish
Published Japan The Japanese Circulation Society 2009
Subjects
Adult
Beat-to-beat blood pressure
Blood Flow Velocity
Blood Pressure
Brain Ischemia - complications
Brain Ischemia - diagnosis
Brain Ischemia - physiopathology
Cephalic laser blood flowmeter
Cerebrovascular Circulation
Ear, External
Equipment Design
Female
Heart Rate
Hemodynamics
Humans
Hypotension, Orthostatic - etiology
Hypotension, Orthostatic - physiopathology
Laser-Doppler Flowmetry - instrumentation
Male
Orthostatic hypotension
Posture
Young Adult
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Summary:Background: Patients with orthostatic hypotension have pathologic hemodynamics related to changes in body posture. A new cephalic laser blood flowmeter that can be worn on the tragus to investigate the hemodynamics upon rising from a sitting or squatting posture was developed. Methods and Results: The relationship between cephalic hemodynamics and cerebral ischemic symptoms in 63 subjects in a sitting, squatting, and standing positions using the new device was evaluated. Transient decrease in blood pressure within 15 s after rising to an erect position possibly causes dizziness, syncope, and fall. Subjects exhibiting dizziness upon standing showed a significant decrease in the cephalic blood flow (CBF) and indirect beat-to-beat systolic blood pressure, as monitored by the Finometer, and a significant correlation was observed between the drop ratio (drop value on rising/mean value in the squatting position) of CBF and that of systolic blood pressure. Conclusions: This new wearable CBF-meter is potentially useful for estimating cephalic hemodynamics and objectively diagnosing cerebral ischemic symptoms of subjects in a standing posture. (Circ J 2009; 73: 1950-1955)
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ISSN:1346-9843
1347-4820
DOI:10.1253/circj.CJ-09-0103