Methods of diagnosis using pulse volume measurement

• US 7,485,094 B2
• Filed: 09/30/2003
• Issued: 02/03/2009
• Est. Priority Date: 09/30/2003
• Status: Active Grant

• Current Assignee: Smithmarks, Inc.
• Original Assignee: Smithmarks, Inc.
• Inventors: Smith, Michael, Marks, Lloyd
• Primary Examiner(s): Nasser; Robert L
• Assistant Examiner(s): Toth; Karen E
• Application Number:
  US10/673,167
• Publication Number:
  US 20050070807A1
• Time in Patent Office: 1,953 Days
• Field of Search: 600500-507
• US Class Current: 600/504
• CPC Class Codes: A61B 5/0535 Impedance plethysmography for measuring blood flow A61B5/0295
• CPC Class Codes: A61B 5/412 Detecting or monitoring sepsis

Abstract

The utility of pulse volume measurement is expanded to detection of many conditions which have previously not been detected or have been detected using more complicated techniques. Such conditions include blood loss, septic shock, cardiogenic shock, neonatal sepsis, patent ductus arteriosus, limb ischemia, intra-aortic balloon pump performance, peripheral vascular disease, congestive heart failure, the effectiveness of vasoactive medications, syncope, dehydration, pre-eclampsia, deep vein thrombosis, thermal injuries, vascular instability due to renal dialysis, compromising of circulation to the hand caused by radial artery harvesting, changes in cardiac output, and hypertension. According to the present invention, such diagnoses can be performed by taking one measurement, by taking measurements over time to detect a change or by taking measurements before and after application of a treatment or stimulus.

Claims

1. A method for detecting peripheral vascular disease in a patient, the method comprising:

(a) taking quantitative pulse volume measurements at a plurality of positions on the patient'"'"'s limbs through signal averaging; and

(b) from the quantitative pulse volume measurements, detecting the peripheral vascular disease by calculating an area under a pulse volume curve for each of the patient'"'"'s limbs.

2. The method of claim 1, wherein steps (a) and (b) are performed both before and after intervention to correct the peripheral vascular disease to determine whether the peripheral vascular disease has recurred.

3. The method of claim 1, wherein steps (a) and (b) are performed both before and after intervention to correct the peripheral vascular disease to determine an effectiveness of the intervention.

4. The method of claim 1, wherein step (b) comprises comparing the quantitative pulse volume measurements among the plurality of positions on the patent'"'"'s limbs.

5. The method of claim 4, wherein the quantitative pulse measurement are compared for different limbs of the patient.