The concept of Patient Blood Management requires preoperative diagnostic of anemia. To avoid the harmful procedure of venous puncture for drawing a blood sample, noninvasive measurement of hemoglobin has been developed. However noninvasive measurement of hemoglobin has yet been not accurate enough to replace invasive hemoglobin measurement. This study investigates if a noninvasive measurement tool can serve as a screening tool to find out for which patients invasive measurement of hemoglobin is necessary.
The noninvasive hemoglobin measurement tool Pronto® can measure hemoglobin noninvasively by a sensor clip. The investigators analyzed previous studies with the Pronto device and calculated two cut-off values of the noninvasive hemoglobin device. If noninvasive hemoglobin values are higher than cut off value 1 the investigators postulate that with a sensitivity of 99% the participant has no anemia. To confirm this, participants who are supposed to undergo elective surgery and come to the preoperative anesthetic ambulance are measured by the Pronto-device. The noninvasive measurements are compared with the laboratory values of the patients and cut-off value 1 can be confirmed.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
1,129
All patients who are planned to undergo elective surgery come to the preoperative anesthetic ambulance. They are all measured by the Pronto® hemoglobin measurement tool
Johannes Gutenbert University Centre
Mainz, Germany
Validation of a postulated noninvasively measured haemoglobin value as a cut-off value for the decision wether invasively measuring of haemoglobin concentration for preoperative patient blood management is necessary.
Previous studies show that noninvasively measured haemoglobin is not accurate enough to determine exactly the haemoglobin value for preoperative diagnosis of anaemia. We postulate that noninvasive haemoglobin measurement can be used as a screening tool to decide wether invasive measurement of haemoglobin is necessary. We calculated a cut-off value 1 by analysing previous studies. Noninvasive haemoglobin measurements that are above the cut-off-value are postulated to show that the patient is not anaemic with a sensitivity of 99%.
Time frame: five to ten minutes
Validation of postulated non invasively measured haemoglobin value as a cut off-value 2
We calculated a cut-off value 2 by analysing previous studies. Noninvasive haemoglobin measurements that are below the cut-off-value 2 are postulated to show that the patient is anaemic with a speciality of 99%.
Time frame: five to ten minutes
Agreement between invasive and noninvasive measurement in adults and children
Noninvasive haemoglobin measurement values are compared with invasive haemoglobin measurement values
Time frame: five to ten minutes
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