Perfusion Index
Conditions
Keywords
Pulse oximetry, Perfusion index, Finger replantation, Smartwatch
Brief summary
The aim of the study is to experimentally compare measured perfusion index values between smartwatch and a medical grade pulse oximeter in healthy subjects at rest and with and without motion artifacts and during exercise.
Detailed description
Perfusion index (PI) is one of the many vital signs monitored to assess the clinical status of a patient. PI is determined from the pulsatile part of the plethysmographic curve, with typical values measured on the fingers ranging from 0.02% to 20%. Although PI is a relatively newly measured parameter, it has already found application in many areas of clinical medicine. For example, continuous measurement of the perfusion index has been used to monitor changes in finger blood flow after finger replantation (surgical reattachment of the finger to the patient's body). As the ability to monitor the perfusion index begins to become part of the monitored parameters of smartwatches, this new feature could be used in situations where the use of finger sensors is not appropriate. However, no comparison of perfusion index measurements between smartwatch and pulse oximeter has been made to date.
Interventions
OTHERResting conditions
The volunteers hand is at rest and Perfusion index readings are taken for six minutes from pulse oximeter and smartwatch
OTHERMovement artifacts
The volunteer periodically spreads his/her fingers and clenches them into a fist, and Perfusion index readings are taken for six minutes from pulse oximeter and smartwatch.
The volunteers arm is constricted using a cuff to measure non-invasive blood pressure. The perfusion index value is monitored during the time of cuff pressure and cuff release. The measurement is followed by a 4-minute pause to allow the vascular supply to stabilize. The measurement is repeated three times.
OTHERPhysical exercise
The volunteer is seated on the exercise bike, rests his forearms on the handlebars and is instructed not to move his arms. The volunteer's heart rate is controlled to increase to 120 beats per minute. For five minutes, the perfusion index is recorded from a pulse oximeter and smartwatch.
Sponsors
Czech Technical University in Prague
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Intervention model description
Interventional prospective single-arm study
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Healthy Adult Volunteer
Exclusion criteria
* Post-traumatic upper limb conditions affecting finger or arm perfusion * Injuries or diseases of the skin of the fingers and arm * Any acute phase of any disease
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Comparison of measured perfusion index values between pulse oximeter and smartwatch during different interventions. | 1 hour | The comparison of measured perfusion index values between pulse oximeter and smartwatch during different interventions (Resting conditions, Movement artifacts, Circulation costriction and Physical exercise) will be analyzed. |
Contacts
Primary ContactSimon Walzel, MEng.
Backup ContactKarel Roubik, Prof.
Outcome results
None listed