A system, comprising: an intravascular catheter comprising an elongated shaft having a proximal portion and a distal portion, wherein the distal portion comprises a therapeutic assembly comprising multiple energy delivery elements configured to be positioned within a blood vessel of a human patient and at least proximate to neural fibers associated with sympathetic neural function of the patient; and an energy source configured for connection to the energy delivery elements and configured to deliver energy via the energy delivery elements to the neural fibers; and wherein the energy source comprises a controller including memory and processing circuitry, the memory storing instructions that, when executed by the controller using the processing circuitry, cause the controller to- obtain a first data set associated with a first energy delivery element of the multiple energy delivery elements, wherein the first data set includes a first impedance parameter and a first temperature parameter; obtain a second data set associated with a second energy delivery element of the multiple energy delivery elements, wherein the second energy delivery element is spaced apart from the first energy delivery element by an element separation distance, and wherein the second data set includes a second impedance parameter and a second temperature parameter; and determine a blood flow velocity in the blood vessel at or otherwise proximate to the therapeutic assembly based on the first data set and the second data set. an intravascular catheter comprising an elongated shaft having a proximal portion and a distal portion, wherein the distal portion comprises a therapeutic assembly comprising multiple energy delivery elements configured to be positioned within a blood vessel of a human patient and at least proximate to neural fibers associated with sympathetic neural function of the patient; and an energy source configured for connection to the energy delivery elements and configured to deliver energy via the energy delivery elements to the neural fibers; and wherein the energy source comprises a controller including memory and processing circuitry, the memory storing instructions that, when executed by the controller using the processing circuitry, cause the controller to- obtain a first data set associated with a first energy delivery element of the multiple energy delivery elements, wherein the first data set includes a first impedance parameter and a first temperature parameter; obtain a second data set associated with a second energy delivery element of the multiple energy delivery elements, wherein the second energy delivery element is spaced apart from the first energy delivery element by an element separation distance, and wherein the second data set includes a second impedance parameter and a second temperature parameter; and determine a blood flow velocity in the blood vessel at or otherwise proximate to the therapeutic assembly based on the first data set and the second data set. obtain a first data set associated with a first energy delivery element of the multiple energy delivery elements, wherein the first data set includes a first impedance parameter and a first temperature parameter; obtain a second data set associated with a second energy delivery element of the multiple energy delivery elements, wherein the second energy delivery element is spaced apart from the first energy delivery element by an element separation distance, and wherein the second data set includes a second impedance parameter and a second temperature parameter; and determine a blood flow velocity in the blood vessel at or otherwise proximate to the therapeutic assembly based on the first data set and the second data set.