Method of validating physiologic events resulting from a heartbeat

• US 5,339,822 A
• Filed: 06/04/1993
• Issued: 08/23/1994
• Est. Priority Date: 05/07/1991
• Status: Expired due to Term

• Current Assignee: Protocol Systems Inc
• Original Assignee: Protocol Systems Inc
• Inventors: Salisbury, Herbert R., Bennett, Ronald G., Taylor, Lee A.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/072,864
• Time in Patent Office: 445 Days
• Field of Search: 128/690, 128/696, 128/702, 128/703, 128/706, 128/708
• US Class Current: 600/513
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/0285 Measuring or recording phase velocity of blood waves

Abstract

An improved method of validating pulse-like, heartbeat-induced physiologic events, such as blood-pressure pulses, is described in relation to vital signs monitoring apparatus that is also capable of monitoring R-waves obtained from an ECG sensor. The method includes the steps of monitoring the occurrence of an R-wave followed by an event of interest, and validating such event based upon analyzing, along with other preselected criteria, a time relationship extant between the R-wave and the event. The validating step includes the steps of noting the time period between selected points of the two occurrences, labeling the time period based on preselected timing criteria, and using the label with other criteria to validate the event. Events whose immediate validation is questionable are placed in a "wait and see" category for future review. The disclosed method further includes the step of repeating the monitoring, noting and labeling steps for successive R-waves and pulses, thus to establish a first measurement cycle. Also, disclosed is a step for adapting the preselected timing criteria based upon already analyzed time relationships.

Claims

1. An improved method of validating whether pulse-like, physiologic events monitored by vital signs monitoring apparatus connected to a living subject are heartbeat-induced, with such apparatus being capable of monitoring successively, both the pulses of such events and event-validating R-wave information, and being capable of providing other event-validating criteria which criteria are independent of R-wave-related information, comprising:

monitoring the occurrence of an R-wave and the occurrence of a pulse of such an event;

providing at least one of such other criteria;

analyzing, along with such provided criteria, time relationships extant between the R-wave and the pulse, wherein the analyzing step includes analyzing such time relationships by the substeps of detecting selected points of the two occurrences, noting the time period between those selected points, preselecting timing standards, labeling the time period based upon the preselected timing standards, and using the label with such other criteria to validate the event;

validating such event based upon the analyzing;

choosing for additional validation a number of additional, successive pairs of R-waves and pulses;

repeating the monitoring, providing, detecting, noting, labeling, using and validating steps for the chosen number of additional, successive pairs;

based upon the repeating, adapting the preselected timing standards based upon the already analyzed time relationships; and

using validated events to determine vital signs of the subject.

2. The method of claim 1, wherein the monitoring step involves monitoring the occurrence of an R-wave followed by the occurrence of a pulse of such an event.

3. The method of claim 2, wherein the monitoring step involves monitoring an oscillometric pulse as each pulse of such an event.

4. An improved method of validating whether pulse-like, physiologic events monitored by vital signs monitoring apparatus connected to a living subject are heartbeat-induced, with such apparatus being capable of monitoring both the pulses of such events and event-validating R-wave information, and being capable of providing other event-validating criteria which criteria are independent of R-wave-related information, comprising:

monitoring the occurrence of an R-wave and a pulse of such an event;

providing at least one of such other criteria;

analyzing, along with such provided criteria, time relationships extant between the R-wave and the pulse;

validating such event based upon the analyzing;

using validated events to determine vital signs of the subject; and

with the analyzing of such time relationships including the substeps of detecting selected points of the two occurrences, noting the time period between those selected points, labeling the time period based upon preselected timing standards, and using the label with such other criteria to validate the event, and with the labeling substep including the substep of categorizing each time period, relatively and preliminarily, based upon whether each time period meets such timing standards, with such categorizing relating to the possibility of each event being validated in the validating step, and with the using substep including a wait-and-see (WAS) approach in accordance with Chart I above, toward the ultimate validation of such events based upon the analyzing.

5. An improved method of validating whether pulse-like, physiologic events monitored by vital signs monitoring apparatus connected to a living subject are heartbeat-induced, with such apparatus being capable of monitoring both the pulses of such events and event-validating R-wave information, and being capable of providing other event-validating criteria which criteria are independent of R-wave-related information, comprising:

monitoring the occurrence of an R-wave and the occurrence of a pulse of such an event;

providing at least one of such other criteria;

performing a first analyzing step by evaluating time relationships extant between the R-wave and the event;

performing a second analyzing step by evaluating the analyzed time relationships along with such provided criteria;

validating such event based upon the second analyzing step; and

using validated events to determine vital signs of the subject.

6. The method of claim 5, wherein the step of performing the first analyzing step includes the substeps of detecting selected points of the two occurrences, noting the time period between those selected points, selecting timing standards, categorizing each time period, relatively and preliminarily, based upon the selected timing standards, and wherein the validating step includes the substeps of choosing standards corresponding to such provided criteria, categorizing preliminarily such provided criteria based upon the chosen standards, and using each categorized time period with such other categorized, provided criteria to validate the event.