Abstract: A system includes one or more processors, a user interface, a. sensor, and a. computer readable medium storing instructions that, when executed by the one or more processors, cause the system to perform functions. The functions include generating, via the sensor, a signal representing vibrations originating from a. blood vessel of a patient and generating an intensity' spectrum of the signal that indicates intensities of the vibrations with respect to oscillation frequencies of the vibrations. The functions also include identifying a first peak of the intensity spectrum that corresponds to a respiratory' frequency of the patient and a second peak of the intensity spectrum that corresponds to a heart rate of the patient. The functions also include performing a comparison of a. first intensity of the first peak with a second intensify of the second peak and generating, via the user interface, output indicative of the comparison.

Abstract: An example method includes (a) generating, via a sensor of a computing device, a signal representing vibrations originating from a blood vessel of a subject, where the vibrations are indicative of heart beats and/or respirations of the subject; (b) using the signal to determine first times elapsed between respective pairs of consecutive heartbeats indicated by the vibrations and/or second times elapsed between respective pairs of consecutive respirations indicated by the vibrations; and (c) using the determined first times elapsed to determine a heart rate variability of the subject and/or the determined second times elapsed to determine a respiration rate variability of the subject.

Abstract: An example method includes (a) generating, via a sensor of a computing device, a signal representing vibrations originating from a blood vessel of a subject, where the vibrations are indicative of heart beats and/or respirations of the subject; (b) using the signal to determine first times elapsed between respective pairs of consecutive heartbeats indicated by the vibrations and/or second times elapsed between respective pairs of consecutive respirations indicated by the vibrations; and (c) using the determined first times elapsed to determine a heart rate variability of the subject and/or the determined second times elapsed to determine a respiration rate variability of the subject.

Abstract: A method embodiment includes generating, via a sensor of a computing device, a signal representing vibrations originating from a blood vessel of a subject and decomposing the signal into one or more first intrinsic oscillatory modes and one or more second intrinsic oscillatory modes. The one or more first intrinsic oscillatory modes have respective oscillation frequencies that are less than respective oscillation frequencies of the one or more second intrinsic oscillatory modes. The method includes obtaining an intensity spectrum of the one or more first intrinsic oscillatory modes over a range of frequencies and using the obtained intensity spectrum to determine a blood volume status of the subject. Another method embodiment includes using the one or more second intrinsic oscillatory modes to determine one or more mechanical properties of the blood vessel or tissue adjacent to the blood vessel.

Abstract: The leading cause of graft failure is the subsequent development of intimal hyperplasia, which represents a response to injury that is thought to involve smooth muscle proliferation, migration, phenotypic modulation, and extracellular matrix (ECM) deposition. Surgical techniques typically employed for vein harvest—stretching the vein, placing the vein in low pH, solutions, and the use of toxic surgical skin markers—are shown here to cause injury. The invention therefore provides for non-toxic surgical markers than also protect against stretch-induced loss of functional viability, along with other additives. Devices and compositions for reducing physical stress or protecting from the effects flowing therefrom, also are provided.

Abstract: The leading cause of graft failure is the subsequent development of intimal hyperplasia, which represents a response to injury that is thought to involve smooth muscle proliferation, migration, phenotypic modulation, and extracellular matrix (ECM) deposition. Surgical techniques typically employed for vein harvest—stretching the vein, placing the vein in low pH, solutions, and the use of toxic surgical skin markers—are shown here to cause injury. The invention therefore provides for non-toxic surgical markers than also protect against stretch-induced loss of functional viability, along with other additives. Devices and compositions for reducing physical stress or protecting from the effects flowing therefrom, also are provided.

Abstract: The leading cause of graft failure is the subsequent development of intimal hyperplasia, which represents a response to injury that is thought to involve smooth muscle proliferation, migration, phenotypic modulation, and extracellular matrix (ECM) deposition. Surgical techniques typically employed for vein harvest—stretching the vein, placing the vein in low pH, solutions, and the use of toxic surgical skin markers—are shown here to cause injury. The invention therefore provides for non-toxic surgical markers than also protect against stretch-induced loss of functional viability, along with other additives. Devices and compositions for reducing physical stress or protecting from the effects flowing therefrom, also are provided.

Abstract: The leading cause of graft failure is the subsequent development of intimal hyperplasia, which represents a response to injury that is thought to involve smooth muscle proliferation, migration, phenotypic modulation, and extracellular matrix (ECM) deposition. Surgical techniques typically employed for vein harvest—stretching the vein, placing the vein in low pH, solutions, and the use of toxic surgical skin markers—are shown here to cause injury. The invention therefore provides for non-toxic surgical markers than also protect against stretch-induced loss of functional viability, along with other additives. Devices and compositions for reducing physical stress or protecting from the effects flowing therefrom, also are provided.