Neuromodulation techniques for perturbation of physiological systems
Embodiments of the present disclosure relate to techniques for inducing physiological perturbations in a subject via neuromodulation, e.g., peripheral neuromodulation of a region of interest of an organ. The nature and degree of the perturbations may be related to the subject's clinical condition. Accordingly, an assessment of one or more characteristics of the perturbations may be used to determine a clinical condition of the subject.
1. A method of causing a change in concentration of one or more molecules in a subject, the method comprising:
directing energy of an energy application device at a region of interest of a subject, wherein the region of interest is in a liver;
applying the energy to the region of interest in the liver to cause the change in concentration of the one or more molecules as a result of applying the energy, wherein the one or more molecules comprises glucose or insulin;
assessing the change in concentration of the one or more molecules relative to a baseline concentration of the one or more molecules, wherein assessing the change in concentration of the one or more molecules comprises determining a concentration of glucose or insulin at a plurality of time points after applying the energy and determining that a trend in the concentration at the plurality of time points is indicative of a return to a baseline glucose concentration within a predetermined time period; and
determining that the subject is in a category selected from a first category or a second category, wherein the first category is responsive to neuromodulation and the second category is non-responsive to neuromodulation and the subject is determined to be in the second category when a change in the concentration relative to the baseline concentration is less than a predetermined threshold change.
2. The method of claim 1 , wherein assessing the change in concentration of the one or more molecules comprises:
determining a concentration of the one or more molecules of interest at a first time point after applying the energy; and
determining a concentration of the one or more molecules of interest at a second time point after applying the energy, the second time point being after the first time point.
3. The method of claim 2 , wherein assessing the change in concentration of the one or more molecules comprises determining a difference between the concentration of the one or more molecules of interest at the first time point and the second time point, determining a slope of the concentration of the one or more molecules of interest between the first time point and the second time point, or both.
4. The method of claim 1 , wherein assessing the change in concentration of the one or more molecules comprises determining a time between a trough and a recovery peak of the one or more molecules of interest.
5. The method of claim 1 , comprising causing the energy application device to deliver treatment energy to the region of interest, wherein the treatment energy is applied according to a treatment protocol selected based on a circulating glucose concentration.
6. The method of claim 1 , wherein the subject is not fasted and wherein applying the energy causes an approximated fasting state.
7. A method of causing a change in concentration of a molecule of interest in a subject, the method comprising:
directing energy of an energy application device at a region of interest of a subject;
applying the energy to the region of interest to cause the change in concentration of the molecule of interest as a result of applying the energy;
assessing the change in concentration of the molecule of interest at one or more time points after the application, wherein assessing the change in concentration of the molecule of interest comprises:
determining a concentration of the molecule of interest at a first time point after applying the energy;
determining a concentration of the molecule of interest at a second time point after applying the energy, the second time point being after the first time point;
determining a difference between the concentration of the molecule of interest at the first time point and the second time point, determining a slope of the concentration of the molecule of interest between the first time point and the second time point, or both; and
determining, that the subject is in a category selected from a first category or a second category, wherein the first category is responsive to neuromodulation and the second category is non-responsive to neuromodulation and the subject is determined to be in the second category when a change in the concentration relative to the baseline concentration is less than a predetermined threshold change.
8. The method of claim 7 , wherein the region of interest is in a pancreas and wherein assessing the change in concentration of the molecule of interest comprises determining a concentration of circulating insulin at a plurality of time points after the applying and comparing the concentration at the plurality of time points to a baseline concentration of insulin to determine a responsiveness of the subject to neuromodulation therapy.
9. The method of claim 7 , wherein the region of interest is in a spleen and wherein assessing the change in concentration of the molecule of interest comprises determining a change in a population of immune cells or concentration of cytokines or immune markers after delivering the energy.
10. The method of claim 7 , wherein the region of interest is in a liver and wherein assessing the change in concentration of the molecule of interest comprises determining a concentration of glucose or insulin at a plurality of time points after the applying and determining that a trend in the concentration at the plurality of time points is indicative of a return to a baseline glucose concentration within a predetermined time period.
11. The method of claim 7 , wherein assessing the change in concentration of the molecule of interest comprises receiving image data to identify a systemic response caused by the applying.
12. A method of causing a change in concentration of one or more molecules in a subject, the method comprising:
directing energy of an energy application device at a region of interest of a subject, wherein the energy application device delivers treatment energy to the region of interest and wherein the treatment energy is applied according to a treatment protocol based on a circulating glucose concentration;
applying the energy to the region of interest to cause the change in concentration of the one or more molecules as a result of applying the energy;
assessing the change in concentration of the one or more molecules relative to a baseline concentration of the one or more molecules at one or more time points after applying the energy; and
determining, based on the assessing, that the subject is in a category selected from a first category or a second category, wherein the first category is responsive to neuromodulation and the second category is non-responsive to neuromodulation and the subject is determined to be in the second category when a change in the concentration relative to the baseline concentration is less than a predetermined threshold change.
13. The method of claim 12 , wherein the region of interest is in a pancreas and wherein assessing the change in concentration of the one or more molecules comprises determining a concentration of circulating insulin at a plurality of time points after the applying and comparing the concentration at the plurality of time points to a baseline concentration of insulin to determine a responsiveness of the subject to neuromodulation therapy.
14. The method of claim 12 , wherein the region of interest is in a spleen and wherein assessing the change in concentration of the one or more determining a change in a population of immune cells or concentration of cytokines or immune markers after delivering the energy.
15. The method of claim 12 , wherein the region of interest is in a liver and wherein assessing the change in concentration of the one or more molecules comprises determining a concentration of glucose or insulin at a plurality of time points after the applying and determining that a trend in the concentration at the plurality of time points is indicative of a return to a baseline glucose concentration within a predetermined time period.
16. The method of claim 12 , wherein assessing the change in concentration of the one or more molecules comprises receiving image data to identify a systemic response caused by the applying.