MGI MEDICAL

"OVERCOMING THE LIMITATIONS OF
CONVENTIONAL HEMODYNAMIIC MONITORING"

The Pulse Flowmeter

THE TECHNOLOGY

Completely non-invasive, MGI Medical Pulse Flowmeter uses a patented electrode to obtain pulse flow information by means of a measurement of the electrical properties (impedance) of the extremity. The electrode is easy to apply and comfortable to wear. This information is passed to advanced hardware and signal processing software to compute the blood flow in the extremity. The Pulse Flowmeter is contained within a compact, portable enclosure and presents no risk or discomfort to the patient.



Below is a screen shot demonstrating the intuitive, user friendly interface of the Pulse Flowmeter. (This is from a research study done with the last version of the device.)

This example demonstrates the Pulse Flowmeter's instantaneous response to changing patient hemodynamics.

It illustrates the trend in pulse flow that occurs in response to a Valsalva maneuver, which is a breath holding maneuver which temporarily decreases the cardiac output.

The screen shot shows when the Valsalva was started. The top graph shows the pulse volume curve at this moment in time.

The other 4 graphs are user-selectable trend lines which, in this example, last for 2 minutes. The initiation of the Valsalva is indicated by the vertical, dashed, yellow line.The first and third trend lines are respectively PV (pulse volume) and PF (pulse flow).  Note the dramatic decrease in peripheral flow (about 50%) in response to the Valsalva followed by a period of reactive hyperemia (increased flow greater than the baseline) before finally returning to baseline. The second trend line demonstrates a lagging modest increase in heart rate (HR) in response to the Valsalva. The fourth line (Ro) is  the baseline impedance of the limb which is not affected by the Valsalva.

Click here to see a video of Pulse Flowmeter Measurements being made during a Valsalva maneuver.





Click on the links below for details:


BASIC INFORMATION ABOUT THE DEVICE


Basic Principles of the Pulse Flowmeter

Stability and Reproducibility


 

 SUMMARY OF RESEARCH AND CLINICAL STUDIES TO DATE

 

Key findings that define our current knowledge of pulse volume and flow include:
  1. Pulse Flow measurements are stable and reproducible
  2. A reasonably narrow, clinically useful normal range
  3. Pulse volume and flow are decreased significantly with:
  4. Pulse volume and flow have been observed to change in a manner similar to cardiac output (in response to inotropes and calibrated blood loss).
  5. Pulse Flow correlates highly with total flow

ANIMAL RESEARCH

Pulse Flow Validation in a Captive (Renal) Vascular Bed

Porcine Model of Acute Hemorrhagic Shock


TESTING ON HUMANS

Baseline and Orthostatic Measurements in Normals

Acute Blood Loss During Blood Donation

Treadmill Exercise

Acute Proximal (Cuff) Vascular Occlusion 

Non-Invasive Peripheral Vascular Testing

Chronic Vascular Disease


TESTING DURING MEDICAL PROCEDURES

Femoral Arteriotomy

Heart Surgery

Interventional Peripheral Vascular Procedures

Treatment for Congestive Heart Failure

Administration of Inotropic Agents

Intra-Aortic Balloon Pumping

Cesarean Sections

Renal Dialysis









 

 

 

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