Calibration
Gas calibration procedures The system can be calibrated according to the following procedures: 1. Room air calibration 2. Reference gas calibration 3. Delay calibration 4. Turbine calibration The Room air calibration, forced by the system before every test, consists of a sampling room air. It updates the baseline of the CO2 analyzer and the gain of the O2 analyzer, in order to match the readings with the predicted athmospheric values (20.93% for O2 and 0.03% for CO2).
Set the reference values using the Portable Unit To set reference values from the K4 b2 Portable Unit go to the main menu, choose Calibration and scroll tasks up to choose Set Cal. Predicted Values, type the values using the arrow keys and press Enter to confirm changes. Room air calibration Room Air calibration is forced to be performed before each test. With this procedure the sss Note: After turning on the unit, wait 45 minutes warm up time before starting the calibration procedure.
have available a cylinder filled of a concentration known of mixed gas. It is suggested to use CO2 5,00% , O2 16% concentrations and N2 for balance. The calibration unit The gas regulator has an adjustable second stage that must be open every time the Notice: Before calibrating be cylinder is used for the calibration. This is necessary to avoid a small leakage in the sure the "Reference values" connections can discharge the bottle in few time. of room air and reference 1.
Gas delay calibration The delay calibration procedure is a calibration included in the software due the time alignment between flow and gas concentration measurements is one of the potential problems to consider to assure accurate readings during test. The gas delay calibration is the measurement of time required by the gas to reach the gas analyzer. For "breath by breath" analysis it is essential that the instantaneous flow rate must be multiplied by the proper time-matched expired gas concentration.
4. 5. When the message “Connect the sampling line and press Enter” appears press Enter and start breathing at a constant rate. The software helps to maintain a constant rate by means of a beep sound. It is not important to maintain the same rate suggested by the system but it is most important to breath constantly. After some cycles a message will appear confirming the delay calibration and the new values will be shown on the display. Press Cancel to return to the previous menu.
Turbine calibration The system uses a turbine flowmeter. It opposes a very low resistance to flow. The air passing through the helical conveyors, takes a spiral motion which causes the rotation of the turbine rotor. The rolling blade interrupts the infrared light beamed by the three diodes of the optoelectronic reader. Every interruption represents 1/6 turn of the rotor, this allows to measure the number of turn in the time.
expiratory strokes in order to get the first values appearing on the display. Then move the syringe piston for other 10 strokes (IN and EX). 4. 5. At each of the 10 steps the software displays the results of the manoeuvre and the percentage error in the reading. At the end of this operation, the software displays the new calibration factors. Press OK to store the new value. Turbine calibration using the Portable Unit 2 50 - K4 b User Manual 1. 2.
Checking the system signals The control panel The Control Panel, which can be activated from the Calibration/Control panel… menu item, is a useful tool to check the main hardware functions of K4 b2. By using the controls on Control Panel you are able to do the following: 1. Reading the signals acquired by the system both as voltages and processed data; 2. Activating/Disactivating the valves, the sampling pump and other installed components (for example, oxymeter).
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Operating modes
K4 b2 Operating modes K4 b2 is a versatile system. You can use it in the field or in the lab without any kind of limitation. Test can be carried out in the following three different configuration: • Holter Data Recorder • Telemetry Data Transmission • Laboratory Station Holter Data Recorder Using the system in the field without the Receiver unit you can store data "breath by breath" in high capacity memory (1 MB).
Portable Unit User Interface diagram Chapter 5 - Operating modes - 55
Holter Data Recorder Mode It is ideal operating modes if you need to test a patient difficult to monitor by Telemetry (i.e. climbing, long distances races, etc). The memory capacity of the K4 b2 is able to store data up to 16 thousands breaths. The system saves data for each breath, hence time storing capacity depends on the respiratory frequency. 1. 2. 3. 4. 5. 6. 7. sss Note: USA and Japan versions have the items 3 and 5 slightly different because of the antenna placement.
3. The message "Insert relative humidity" will be visualized, type the correct value and press Enter. 4. The K4 b2 runs automatically the Room Air calibration. The message "Do not breath near the sampling line" appears. Wait for few seconds until the message "Calibration done" will appear together with a double beep sound. 5. Connect the sampling plug to the optoelectronic reader. Some values (Heart Rate, R, VO2, VCO2,...) will be shown and updated each breath on the control panel display.
Telemetry Data Transmission Mode sss Note: USA and Japan versions have the items 3 and 5 slightly different because of the antenna placement. In case you need to monitor in real time the test you can use the Telemetry Data Transmission module that is provided by COSMED as an option. The transmission range can reach 800 m allowing to monitor exercise testing in the field. To use this option you need a personal computer to connect the receiver unit. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
4. The HR Max is automatically calculated by the formula 220-age, however it can be also changed according to physician experience and patient medical history. By confirming the HR rate value all the patient data are automatically saved. Enable reception on PC 1. 2. 3. 4. 5. 6. Run K4 b2 software. Open patient data dialog box, select or type a new name and press OK to confirm. The name of the selected patient will appear in the status bar of the software. Choose Execute test from the Test menu.
5. 6. 7. Connect the sampling plug to the optoelectronic reader. Some values (Heart Rate, R, VO2, VCO2,...) will be shown and updated each breath on the control panel display. The message "Press Enter to start the test" will be displayed each 10 secs. You can switch to different values by moving the Up and Down key. After having pressed the Enter key the test starts but the K4b2 is not storing data.
Serial Mode sss Note: USA and Japan versions have the items 3 and 5 slightly different because of the antenna placement. When the K4 b2 is used in the serial mode the system works exactly as any other conventional laboratory station. In this mode the software controls completely the K4 b2 portable unit so that any command such as calibration can be run by the software. You can also drive an ergometer if a second serial port is available in the PC. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Start the test 1. 2. 3. 4. 5. 6. Open patient data dialogue box, select or type a new name and press OK to confirm. The name of the selected patient will appear in the status bar of the software. Choose Execute test from the Test menu. Type the patient information, select a protocol from the list and an ergometer if you are going to carry out a test with an ergometer. Chose Other Data if you want to insert other important informationon the the you are going to perform.
Database Management
Exercise testing patient's database The exercise testing software uses a different interface for presenting patient information. The patient database allows to: • Enter a new patient • Find patient data • Edit patient data • Delete patient data. Select Patients from the File menu. Enter a new patient 1. 2. Press New to show the Patient dialog box. Enter data of a new patient and press OK button to confirm.
Uploading tests from the Portable Unit In telemetry and holter function you could need to upload data from the portable unit via serial port. 1. Link up the PU to the PC with the RS232 cable supplied. 2. Turn on the Portable Unit. 3. Choose Receive Test from Test menu or press Alt F2. 4. 5. 6. To be downloaded the test must be linked to a patient. If the current patient has already been inserted in the database, choose Find and then List select the patient and confirm.
Archive maintenance The software allows to manage files selecting Archive from the File menu. It is advisable to perform the archive reorganisation every month, in order to free space on the hard disk and/or to correct possible errors present within the database. It is possible also that your have no more hard disk space. So, you have to delete all the data. In this case, it is useful to perform the initialising. Reorganise the archive 1. 2. Select Reorganize archive from the File menu.
Spirometry patient's database The Patients database consists of a Patient Card, a Visit Card and a Test Card in which are listed all tests performed by the patient. Select Archive Navigator from the File menu or press the button by side. Patient Card It collects all the information of a patient (first name, last name, date of birth) which remain the same for each visit. For each patient there is only one Patient Card, which is created the first time the Patient performs a test.
