Assessing Fluid Responsiveness With PWTT
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|ClinicalTrials.gov Identifier: NCT03280953|
Recruitment Status : Recruiting
First Posted : September 13, 2017
Last Update Posted : September 13, 2017
|Condition or disease||Intervention/treatment|
|Fluid Therapy Monitoring, Intraoperative||Diagnostic Test: Assessing fluid responsiveness by PWTT value|
PWTT is determined by measuring the beginning and the end of pulse wave duration and can be calculated as the time interval from the ECG R-wave peak to the rise point of the pulse oximeter wave.
it consists of two components: pre ejection period (PEP) and arterial pulse wave transit time (a-PWTT). PEP is defined as the time from the ECG R wave to the rise point of the aortic root pressure wave. a-PWTT is defined as the time from the rise point of the aortic pressure wave to the rise point of the pulse oximeter wave. a-PWTT is the component which is directly related to the velocity of the pulse wave. However noninvasively, we can measure only PWTT, which also includes PEP. In general, PEP change over short periods of time is negligible in most cases, so we can assume that PWTT corresponds to
a-PWTT. In studies using several studies using animals and healthy volunteers, PWTT showed good correlation with stroke volume or systolic blood pressure. Also in experimental and clinical setting, it is shown that PEP changes indicate change in preloads.
It is not known at this moment, which of the following factors to be considered in processing raw data to acquire accurate PWTT value on predicting fluid responsiveness.
- The beginning of pulse wave can be assessed by the appearance of either Q wave, which represents the initial phase of depolarisation going through the interventricular septum or R wave, which represents the ventricular depolarisation in ECG.
- The end of pulse wave duration can be assessed by peripheral plethysmography mostly from a finger tip but also from an ear lobe.
- The pulse wave time can be simply measured as it is, but can also be adjusted by heart rate using Bazett-Formula.
- Not only the simple PWTT but also ventilatory induced fluctuation of PWTT (ΔPWTT) may be used for predicting fluid responsiveness.
|Study Type :||Observational|
|Estimated Enrollment :||60 participants|
|Official Title:||Finding the Cut-off Value of Pulse Wave Transit Time (PWTT) to Estimate the Fluid Responsibility|
|Actual Study Start Date :||May 31, 2016|
|Estimated Primary Completion Date :||December 31, 2017|
|Estimated Study Completion Date :||March 31, 2018|
- Diagnostic Test: Assessing fluid responsiveness by PWTT value
PWTT value will be analysed to find the cutoff values compared by esophageal doppler and pulse pressure variation.
- PWTT change before and after fluid bolus [ Time Frame: 1 day ]PWTT recorded before and 1 minute after fluid bolus of 7ml/kg intraoperatively. PWTT values will be calculated: defining PWTT start by either Q-wave or R-wave, defining PWTT end at arrival of the plethysmographic signal either at the finger tip or at the ear lobe, defining PWTT length by either simple measurement or adjusted by the Bazett-Formula. Additionally, as a dynamic parameter respiratory variation of PWTT (ΔPWTT) will be computed.
- Heart rate before and after fluid bolus [ Time Frame: 1 day ]Heart rate (in beats per minute), derived from intraoperative standard monitoring. This hemodynamic parameter will be measured before and 1min after fluid bolus.
- Blood pressure before and after fluid bolus [ Time Frame: 1 day ]Systolic blood pressure/diastolic blood pressure/mean arterial pressure (in millimeters of mercury), derived from intraoperative standard monitoring. This hemodynamic parameter will be measured before and 1min after fluid bolus.
- Flow Time corrected before and after fluid bolus [ Time Frame: 1 day ]Flow Time corrected (in milliseconds) measured by esophageal doppler. This hemodynamic parameter will be measured before and 1min after fluid bolus.
- Stroke volume before and after fluid bolus [ Time Frame: 1 day ]Stroke volume (in milliliters per heartbeat) measured by esophageal doppler. This hemodynamic parameter will be measured before and 1min after fluid bolus.
- Pulse Pressure Variation before and after fluid bolus [ Time Frame: 1 day ]Pulse Pressure Variation (as percentage) assessed using arterial pressure monitoring. This hemodynamic parameter will be measured before and 1min after fluid bolus.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03280953
|Contact: Kimiko Fukui-Dunkel, M.D., Ph.D.||+49 162 322 firstname.lastname@example.org|
|Contact: Gunther J Pestel, M.D., Ph.D.||+49 6131 17 email@example.com|
|University Medical Center of Johannes Gutenberg University||Recruiting|
|Mainz, Rheinland-Pfalz, Germany, 55131|
|Contact: Susanne Mauff +49 6131 177175 firstname.lastname@example.org|
|Principal Investigator: Kimiko Fukui-Dunkel, M.D., Ph.D.|
|Sub-Investigator: Gunther J Pestel, M.D., Ph.D.|
|Sub-Investigator: Midoriko Higashi, M.D., Ph.D.|
|Sub-Investigator: Johannes Wirkus|
|Principal Investigator:||Kimiko Fukui-Dunkel, M.D., Ph.D.||University Medical Center of Johannes Gutenberg University|