B-4 Starling Monitor - User Guide
System Performance Specifications and Accuracy
TFC
Thoracic Fluid Content
The simple inverse of Zo (or 1/Zo). Because it is the inverse of the
impedance, it reflects the electrical conductivity of the chest cavity
which is also a corollary to the content of fluid in the thorax.
TFCd
Indicates the dynamic change
in TFC, over time.
It calculates this by measuring the percentage change between the
average of the last 10 TFC measurements and the average of 10
consecutive TFC readings measured at a specific time as set by the
operator. For example, if the user chooses to view TFCd in increments of
1 hour, the average of the last 10 TFC readings is 60 and the average of
10 consecutive TFC readings occurring one hour before is 50, then the
TFCd is 20%.
TFCdO
Indicates the change in
percentage terms from the
average TFC acquired in the
first five TFC readings.
To illustrate, if average TFC during the first 5 readings was 40 and the
current TFC is 44, this represents a 10% elevation in the TFC relative to
the TFC baseline average absolute value. Thus, the TFCd0 that will be
displayed will be +10%.
TPR
Total Peripheral Resistance
The resistance to flow that must be overcome in order to push blood
through the circulatory system, or the net resistance to blood flow in all
the small arteries and microscopic arterioles.
TPR= 80 x MAP/CO
TPRI
Total Peripheral Resistance
Index
The indexed version of the TPR.
TPRI= 80 x MAP/CI
VET
Ventricular Ejection Time
The time of ejection of blood from the ventricle beginning with aortic
valve opening and ending with aortic valve closure.
The unit of measurement is milliseconds.
ZO
The electrical impedance of the chest cavity.
a. Mendoza DD, Cooper HA, Panza JA. Cardiac power output predicts mortality across a broad spectrum of patients
with acute cardiac disease.
American Heart Journal 2007, Volume 153 (3); 366-370.
Table B-2 Primary Measurements Calculated and Displayed (continued)
Parameter Measurement Description
To Next Page
Loading...
