Evaluating the State of Microvessels by Minimum Rise Time (MRT01) (MRT01)
Evaluating an Optical Index (Minimum Rise Time) as a Measure for the State of Microvessels
Photoplethysmography (PPG) is a simple uncalibrated optical method of monitoring variations in skin blood volume. The objective of the current study is to investigate a potential relationship between MRT (minimum rise time, in time units) a measure derived from PPG and the state of microvessels.
This study includes a 1-2 hour single session per subject during which PPG and other microvascular and systemic variables will be monitored in response to non-invasive interventions that are known to elicit microvascular responses.
Studieoversikt
Status
Forhold
Detaljert beskrivelse
Photoplethysmography (PPG) is a simple uncalibrated optical method of monitoring variations in skin blood volume. A major limitation of PPG is the lack of a quantitative method for calibrating this signal. A method that provides an absolute measure (in time units) called 'minimum rise time' (MRT) was published in 1985 by Dr. Benjamin Gavish, one of the study investigators. However, a possible relationship between MRT and the state of arterioles that determines the microvascular flow has never been investigated. Such relationship, if validated, could have clinical impact in noninvasive diagnosis of vascular diseases and monitoring microvascular response to treatments that affect at both clinic and home setting.
The objective of the current study is to investigate a potential relationship between variations of MRT (minimum rise time, in time units) and microcirculatory variables induced by interventions that are expected to have acute effect on the state of arterioles and the tissue oxygenation.
This study includes a single 1-2 hour session per subject, during which PPG and other microvascular and systemic variables will be monitored in healthy volunteers in response to a number of non-invasive interventions/device that are approved for clinical use and known to elicit microvascular responses. These interventions are applied consecutively, include breathing at different rates, low power visible light in the red-to-near-infrared range, and local temperature changes. The experimental sessions will be conducted at the Afeka College by the study investigators.
Studietype
Registrering (Faktiske)
Fase
- Ikke aktuelt
Kontakter og plasseringer
Studiesteder
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Tel Aviv, Israel
- Afeka, Tel-Aviv Academic College of Engineering
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Deltakelseskriterier
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
Tar imot friske frivillige
Kjønn som er kvalifisert for studier
Beskrivelse
Inclusion Criteria:
- Healthy males and females, between 18 and 65 years of age.
- Willing to sign informed consent.
Exclusion Criteria:
- Currently smoking
- Any abnormal skin condition in the area of light irradiation.
- Pregnant having given birth less than 3 months ago, and/or breastfeeding.
- Having a history of diseases stimulated by heat, such as recurrent Herpes Simplex in the treated area, unless treatment is conducted following a prophylactic regimen.
- Having any illness that might affect the vasculature, such as diabetes (type I or II)
- Suffering from significant concurrent illness, such as cardiac disorders, , or pertinent neurological disorders.
- As per the Investigator's discretion, any physical or mental condition which might make it unsafe for the subject to participate in this study.
Studieplan
Hvordan er studiet utformet?
Designdetaljer
- Primært formål: Diagnostisk
- Tildeling: Randomisert
- Intervensjonsmodell: Parallell tildeling
- Masking: Enkelt
Våpen og intervensjoner
Deltakergruppe / Arm |
Intervensjon / Behandling |
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Eksperimentell: Red LED
Light emitting diodes, 670 nm, 50 mW/cm2, Quantum Warp10 (Quantum Devices Inc, Barneveld, WI, USA); RESPeRATE; Heat/cold provocation
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The subjects will be guided by a digital metronome to breath at 15, 10, and 6 breaths/min for 2 minutes each using the metronome function of the device RESPeRATE (InterCure, Israel) that guides breathing using musical tones played at selectable rhythm.
Immersion of one foot in a warm water bath ( 43-45 degrees C) for few seconds and then immersion of the same foot in cold water bath (5-7 degrees C) for 1 min.
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Aktiv komparator: Near Infrared LED
Light emitting diodes, 830 nm, 55 mW/cm2, Omnilux new-U (Photomedex, Horsham, PA, USA); RESPeRATE; Heat/cold provocation
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The subjects will be guided by a digital metronome to breath at 15, 10, and 6 breaths/min for 2 minutes each using the metronome function of the device RESPeRATE (InterCure, Israel) that guides breathing using musical tones played at selectable rhythm.
Immersion of one foot in a warm water bath ( 43-45 degrees C) for few seconds and then immersion of the same foot in cold water bath (5-7 degrees C) for 1 min.
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Hva måler studien?
Primære resultatmål
Resultatmål |
Tidsramme |
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MRT as measured from finger Photoplethysmography in response to changes in breathing rate
Tidsramme: Change from baseline to up to 1 minute after termination of 2 minutes of constant breathing rate (15, 10, and 6 breath/min)
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Change from baseline to up to 1 minute after termination of 2 minutes of constant breathing rate (15, 10, and 6 breath/min)
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MRT as measured from finger Photoplethysmography in response to light source
Tidsramme: Change from immediately before exposure to light source to up to 10 minutes after exposure to light source
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Change from immediately before exposure to light source to up to 10 minutes after exposure to light source
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MRT as measured from finger Photoplethysmography in response to temperature changes
Tidsramme: Change from immediately before exposure to temperature provocations to up to 2 minutes after exposure to warm water, and up to 2 minutes after exposure to cold water
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Change from immediately before exposure to temperature provocations to up to 2 minutes after exposure to warm water, and up to 2 minutes after exposure to cold water
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Sekundære resultatmål
Resultatmål |
Tidsramme |
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Capillary blood flow (red blood cell velocity or flux in 'perfusion units') as measured by laser doppler
Tidsramme: At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
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At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
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Transcutaneous oxygen pressure (tcpO2 in mmHg)
Tidsramme: At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
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At baseline, 1 minute after each changes in breathing rate, 5 and 10 minutes after exposure to light source, 1 minutes after each exposure to temperature changes
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Samarbeidspartnere og etterforskere
Samarbeidspartnere
Etterforskere
- Hovedetterforsker: Moshe Halak, MD, Sheba medical center
- Studieleder: Zehava Blechman, PhD, Afeka, Tel-Aviv Academic College of Engineering
Publikasjoner og nyttige lenker
Studierekorddatoer
Studer hoveddatoer
Studiestart
Primær fullføring (Faktiske)
Studiet fullført (Faktiske)
Datoer for studieregistrering
Først innsendt
Først innsendt som oppfylte QC-kriteriene
Først lagt ut (Anslag)
Oppdateringer av studieposter
Sist oppdatering lagt ut (Anslag)
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Sist bekreftet
Mer informasjon
Begreper knyttet til denne studien
Andre studie-ID-numre
- 2080-15-SMC
Plan for individuelle deltakerdata (IPD)
Planlegger du å dele individuelle deltakerdata (IPD)?
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