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04/16/09 - USPTO Class 600 |  63 views | #20090099424 | Prev - Next | About this Page  600 rss/xml feed  monitor keywords

Patient monitoring

USPTO Application #: 20090099424
Title: Patient monitoring
Abstract: A hemodynamic monitor and corresponding method for determining the requirement for, and if required the nature or extent of, and for monitoring the response to, an intervention by a carer for a subject in order to improve the hydration level and hemodynamic status of the subject during a period or periods of hemodynamic instability includes, firstly, a processor. The processor incorporates software arranged to continuously analyse and process a blood pressure or arterial volume/plethysmographic signal obtained from the subject in order to derive a plurality of complementary parameters throughout the monitoring of the subject. The monitor also incorporates display means displaying images representing the derived plurality of complementary parameters. The images include at least one image representing graphically at least one stress related hemodynamic parameter plotted against time to provide an immediate indication of a change in hemodynamic status and thus the requirement for an intervention. The images also include at least one image representing graphically at least one fluid responsiveness parameter plotted against time to provide an indication of the hydration level and associated ventricular pre load status of the subject to determine the nature or extent of the intervention if required. The images may also include at least one image representing graphically at least one response related parameter compared to the value of the parameter at the point of the intervention to provide an indication of the desired and/or actual response of the subject to an intervention. Trend and acute changes displays may be combined. Specific parameters providing information on the quality of the left ventricle and right heart/venous return/preload may also be derived and displayed. (end of abstract)



Agent: Andrus, Sceales, Starke & Sawall, LLP - Milwaukee, WI, US
Inventors: Terence Kevin O'Brien, Eric Stephen Mills
USPTO Applicaton #: 20090099424 - Class: 600301 (USPTO)

Patient monitoring description/claims


The Patent Description & Claims data below is from USPTO Patent Application 20090099424, Patient monitoring.

Brief Patent Description - Full Patent Description - Patent Application Claims
  monitor keywords FIELD OF THE INVENTION

The present invention relates to improvements in patient monitoring and directing treatment. In particular, the invention relates to apparatus and methods for determining the requirement for, and/or if required the nature or extent of, and/or for monitoring the response to, an intervention by a carer for a subject in order to improve the hydration level and/or hemodynamic status of the subject. The apparatus and methods are particularly useful during a period or periods of hemodynamic instability, such as during a surgical procedure for example.

BACKGROUND OF THE INVENTION

Hemodynamic monitoring is useful in the care of patients, for example in the intensive care unit (ICU) or during surgery. The ICU provides a place for monitoring and care of patients with potentially severe physiological instability requiring advanced artificial life support. Within this context, hemodynamic monitoring is used to identify hemodynamic instability and its cause and monitor the response to therapy. Medical technological advances have enabled monitoring, display, and assessment of many physiological variables (Pinsky M R and Payen D, Crit. Care 2005, 566-572), yet the utility of some aspects of hemodynamic monitoring is unproven. It is the commonly available technologies where clinical studies have demonstrated relevance in terms of improved patient outcome. Physiological measures available from commonly available monitoring devices are given in Table 1.

Table 1. Hemodynamic Monitoring Defined Primary Hemodynamic Variables

A. Non-Invasive Monitoring

1. Electrocardiogram (ECG)

Heart rate, dysrhythmnias, heart rate variability

2. Pulse Oximetry

SpO2, heart rate

3. Arterial Pressure

    • Sphygmomanometer
      • Systolic and diastolic arterial pressure, heart rate, pulsus paradoxus



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