Contec Ambulatory Blood Pressure Monitor ABPM-50 Reference

Download

• Ambulatgory Blood Pressure Monitor ABPM-50 User Guide
• Ambulatgory Blood Pressure Monitor ABPM-50 Software

Ambulatory blood pressure monitoring: Caution

Prolonged non-invasive blood pressure measurements in Auto mode may be associated with purport, ischemia and neuropathy in the limb wearing the cuff. When monitoring a patient, examine the extremities of the limb frequently for normal color, warmth and sensitivity. If any abnormality is observed, stop the blood pressure measurements.

• You must not perform NIBP measurements on patients with sickle-cell disease or under any condition which the skin is damaged or expected to be damaged.
• For a thrombasthenia patient, it is important to determine whether measurement of the blood pressure shall be done automatically. The determination should be based on clinical evaluation.
• Do not apply the cuff to a limb that has an intravenous infusion or catheter in place. This could cause tissue damage around the catheter when infusion is slowed or blocked during cuff inflation.

Tips and random notes

Reinstall software

Follow the steps below to remove the program prior to running the setup program again.

• Uninstall the ABPM50 program from "Add & Remove Program," which can be found in control panel. As an alternative, go to Start >> All Programs >> ABPM50 Monitor >> Uninstall ABPM50 Monitor to remove the program.
• Connect the device to the computer via the USB port.
• Right click on Computer, select Manager >> Device Manager.
• Look for CD Class example (under Other devices) or STM32 Virtual COM port Device (under Ports). If found, double click on the entry and select Driver tab and Uninstall.

Run the ABPM50_Setup. A version of the program can be found in the download section above.

Install driver (Manual)

If the installed software cannot find the ABPM50, the device driver may not be installed properly. To check for this possibility, plug in the ABPM50 in the computer USB port and make sure that it is turned on. Right click on "Computer" and select "Manage" > "Device Manager". If "STM32 Virtual COM port Device (COMx)" appears (see left diagram below) , the device driver is installed properly; if "CD Class example" appears (see right diagram below), Windows finds the device but not the driver; if no extra entry is found, Windows cannot find the device.

In the third case, there is a problem with the USB connection. Try a different USB cable and/or USB port. Get another USB device to verify that the USB cable and USB port work.

In the second case, follow the following steps to reinstall the driver.

• Download a new driver and save it to your hard disk.
• Run the exe file and extract the folder "abpm50" to a temporary location. The folder contains two INF files, one is for 32-bit Windows and the other is for 64-bit Windows.
• In device manager, double click "CD Class example".
• Click the Driver tab, click Update Driver and follow the instructions.
• When Windows asks for the driver location, set it to the folder "abpm50" in the temporary location.
• Continue until the installation finishes.
• Restart the PC.

Software conflicts

The programs running on your PC are interfering with each other in accessing the COM port. One fix is to remove the offending program; however this works only if you know this is the problem and the trick is to find out the offending programs. I am not aware of any easy way to determine the conflict. There are a few things you can do to look for hints.

• Communication error messages (e.g. "Read COM failed") when running a program. This program is a partner involved in the conflict.
• Error messages during system or program startup. The program generating the error message is another potential candidate.
• Install the software on another PC (preferably a clean PC without installed programs that uses the USB port).

For one particular case, on a computer we used for testing various devices, we finally decided to reinstall Windows to solve the problem.

Possible fixes for resolving software conflicts are:

• Uninstall the offending program.
• Reinstall Windows
• Multi-boot: By installing multiple operating systems on the same computer, you can built a "clean" one and run the software on this copy. The drawback is you would require extra disk space and at least two disk partitions, one for each copy.
• Virtual machine: See Microsoft Windows virtual PC, VMware virtual machine and Windows XP virtual machine. Each virtual machine would run within its own environment and would eliminate any interference. When building a virtual machine, do not copy from one that contains the conflicting software.

The application does not use a lot of resources. Any old computer running WXP would work. If you encounter any software conflict, just re-install Windows to get a clean machine.

You should try to install the software on another computer first to verify the problem before trying multi-boot or virtual machine. These two approaches, though not difficult, require some expertise in installing Windows. There are many other advantages in running multiple instances of Windows on one computer, which has saved us many times in the past.

Cuff sizes

The width of the cuff should be either 40% of the limb circumference (50% for neonates) or 2/3 of the upper arm length. The inflatable part of the cuff should be long enough to encircle 50-80%of the limb. The wrong size of cuff can cause erroneous readings. If the cuff size is in question, then use a larger cuff.

Make sure that the cuff edge falls within the range of mark <->. If it does not, use a larger or smaller cuff that fits better.

Patient	Limb Perimeter	Cuff Width
Infant	10-19 cm	8 cm
Child	18-26 cm	10.6 cm
Adult1	25-35 cm	14 cm
Adult2	33 - 47 cm	17 cm
Thigh	46-66 cm	21 cm

ABPM CPT procedure codes

CPT code 93784 thru 93790 may be used for billing purposes, including:

Description	CPT
Ambulatory blood pressure monitoring; including recording, scanning analysis, interpretation and report.	93784
Recording only	93786
Scanning analysis with report	93788
Physician review with interpretation and report	93790

ABPM related IDC-9 codes

Condition	IDC-9
Elevated blood pressure reading without diagnosis of hypertension (The only ICD-9 code covered by Medicare)	796.2
Essential hypertension	401
Essential hypertension - Unspecified (Resistant)	401.9
Hypertensive heart disease	402
Hypertensive renal disease	403
Nocturnal angina	413.0
Ill-defined descriptions and complications of heart disease	429
Orthostatic hypotension	458
Hypotension, unspecified	458.9
Hypertension complicating pregnancy, childbirth, and the puerperium	642
Transient hypertension of pregnancy	642.2
Mild or unspecified pre-eclampsia	642.4
Unspecified hypertension complicating pregnancy	642.9
Maternal hypotension syndrome	669.2
Syncope and collapse	780.2
Other Hypertension (Episodic, Labile, Postural)	997.91

Medicare has approved the use of ABPM under certain medical situations.

Useful information on ambulatory blood pressure monitor

• Ambulatory blood pressure monitoring, Barry P McGrath, and on behalf of the National Blood Pressure Advisory Committee of the National Heart Foundation of Australia, The Medical Journal of Australia
• Ambulatory blood pressure, Wikipedia
• Clinical applications of ambulatory blood pressure monitor, Michael E. Ernst, PharMD, BCPS, George R. Bergus, MD, Medscape Today