Abstract：
:Normalized maximal ventricular power (nPWRmax) is an index of cardiac function which measures the innate blood pumping ability, or contractility, of the left ventricle (LV), and its noninvasive assessment could prove useful in a variety of patients. nPWRmax is defined as the maximum instantaneous product of LV pressure and the rate of change of LV volume, divided by the end diastolic volume squared. We have quantified nPWRmax noninvasively in humans by pairing magnetic resonance imaging (MRI) LV volume measurements with aortic pressure estimated using radial artery tonometry and a frequency domain transfer function. In healthy volunteers undergoing cardiac MRI we have tested the sensitivity of nPWRmax to LV contractility with dobutamine and to cardiac loading with methoxamine, a vasoconstrictor. We have found that aortic pressures can be reliably estimated using a transfer function, which we generated and validated in a group of patients undergoing cardiac catheterization. Furthermore, we found that nPWRmax was unchanged by methoxamine, yet sensitive to contractility, with a 325% increase at dobutamine levels half that given during routine clinical cardiac stress tests for ischemia. In conclusion, we have shown that ventricular contractility can be assessed independent of cardiac loading in patients during routine noninvasive cardiac imaging examinations.
journal_name
Ann Biomed Engjournal_title
Annals of biomedical engineeringauthors
Setser RM,Sayre K,Flacke S,Chia J,Lunn K,Lorenz CHdoi
10.1114/1.1415530subject
Has Abstractpub_date
2001-11-01 00:00:00pages
974-82issue
11eissn
0090-6964issn
1573-9686journal_volume
29pub_type
临床试验,杂志文章abstract：:Left ventricular (LV) diastolic filling is limited by the constraining effects exerted by the pericardium (PE) and the lung/chest wall. The aim of the present study was to assess the validity of various estimates of external cardiac constraint, compared to pericardial surface pressure (Ppe) measured lateral to the LV ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02584288
更新日期：1987-01-01 00:00:00
abstract：:The manner in which energy from an explosion is transmitted into the brain is currently a highly debated topic within the blast injury community. This study was conducted to investigate the injury biomechanics causing blast-related neurotrauma in the rat. Biomechanical responses of the rat head under shock wave loadin...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-011-0343-0
更新日期：2011-10-01 00:00:00
abstract：:Microfluidic devices aim at miniaturizing, automating, and lowering the cost of chemical and biological sample manipulation and detection, hence creating new opportunities for lab-on-a-chip platforms. Recently, optofluidic devices have also emerged where optics is used to enhance the functionality and the performance ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章,评审
doi：10.1007/s10439-011-0385-3
更新日期：2012-02-01 00:00:00
abstract：:A solid tumor is composed of a population of cells that is expanding as a result of cell division. With dense cell packing, the solid matrix of the interstitial tissue is subject to residual stress. In addition, elevated interstitial fluid pressure (IFP) has been reported by researchers for a number of solid tumors. T...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.1554923
更新日期：2003-03-01 00:00:00
abstract：:Continued progress in the field of Brain Interface (BI) research has encouraged the rapid expansion of the BI community over the last two decades. As the number of BI researchers and organizations steadily increases, newer and more advanced technologies are constantly produced, evaluated, and reported. Though the BI c...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-005-9055-7
更新日期：2006-05-01 00:00:00
abstract：:The field of tissue engineering promises to deliver biological substitutes to repair or replace tissues in the body that have been injured or diseased. The clinical demand for musculoskeletal tissues is particularly high, especially for cartilage and bone defects. Although they are generally considered biologically si...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章,评审
doi：10.1023/b:abme.0000007799.60142.78
更新日期：2004-01-01 00:00:00
abstract：:In this paper, an intelligent proportional-integral-derivative (PID) control method is introduced to the robotic testing system for the biomechanical study of human musculoskeletal joints. For the testing system, the robot is a highly nonlinear and heavily coupled complicated system, and the human spinal specimen also...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1023/b:abme.0000030759.80354.e8
更新日期：2004-06-01 00:00:00
abstract：:This paper presents an in vitro temperature mapping study of bovine cardiac tissue during radiofrequency ablation. The objectives were to: (i) develop a technique for measuring the spatial and temporal temperature distribution in the tissue and in the blood during ablation, and (ii) use the temperature measurements to...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.1310218
更新日期：2000-09-01 00:00:00
abstract：:A nonintrusive method for the visualization of pulsatile flow velocity profiles is described. The method is based on the use of a photochromic dye that is added to the fluid being studied and a nitrogen laser which excites the dye producing a marker "line" whose movement can be photographed. A microcomputer is used as...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02584271
更新日期：1986-01-01 00:00:00
abstract：:Predictions from biomechanical models of gait may be sensitive to joint center locations. Most often, the hip joint center (HJC) is derived from locations of reflective markers adhered to the skin. Here, predictive techniques use regression equations of pelvic anatomy to estimate the HJC, whereas functional methods tr...
journal_title：Annals of biomedical engineering
pub_type： 临床试验,杂志文章
doi：10.1007/s10439-015-1522-1
更新日期：2016-07-01 00:00:00
abstract：:Correct development of neuronal tracts requires the coordination of multiple permissive and inhibitory signals. By generating an in vitro microenvironment using soft lithography and microfluidic techniques, multiple guidance cues can be presented in a spatially defined way. Here we evaluated how neurites of dorsal roo...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-008-9486-z
更新日期：2008-06-01 00:00:00
abstract：:Cell migration paths of mammary epithelial cells (expressing different versions of the promigratory tyrosine kinase receptor Her2/Neu) were analyzed within a bimodal framework that is a generalization of the run-and-tumble description applicable to bacterial migration. The mammalian cell trajectories were segregated i...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-008-9592-y
更新日期：2009-01-01 00:00:00
abstract：:In previous shoulder impact studies, the 50th-percentile male GHBMC human body finite-element model was shown to have good biofidelity regarding impact force, but under-predicted shoulder deflection by 80% compared to those observed in the experiment. The goal of this study was to validate the response of the GHBMC M5...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-015-1546-6
更新日期：2016-08-01 00:00:00
abstract：:This project was undertaken to establish if the integral circulation had any effects upon the mechanical behavior of bone. The influence of blood flow in the rabbit tibia on the strain induced at the bone surface when under load was assessed. Recordings were taken from three adult and three immature New Zealand White ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02390377
更新日期：1994-03-01 00:00:00
abstract：:A kinematic analysis of the temporomandibular joint (TMJ) is developed to determine the range of motion of the mandible during normal opening and during special motions required for arthroscopic surgery. The translation of the mandible is restricted by the constraint of the ligaments. By accounting for the maximum all...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02368648
更新日期：1993-11-01 00:00:00
abstract：:Baseball players swung very light and very heavy bats through our instrument and the speed of the bat was recorded. These data were used to make mathematical models for each person. Then these models were coupled with equations of physics for bat-ball collisions to compute the Ideal Bat Weight for each individual. How...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02584443
更新日期：1995-07-01 00:00:00
abstract：:This paper presents two related methods for registering an image of an anatomical object with data from sensors arranged on the object. One method is described with reference to a test case involving a rectangular electrode plaque disposed on a heart surface, which is imaged with MRI. Data from the electrodes is fused...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-007-9350-6
更新日期：2007-10-01 00:00:00
abstract：:There is a high incidence of low back pain (LBP) associated with occupations requiring sustained and/or repetitive lumbar flexion (SLF and RLF, respectively), which cause creep of the viscoelastic tissues. The purpose of this study was to determine the effect of creep on lumbar biomechanics and facet joint capsule (FJ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-005-1742-x
更新日期：2005-03-01 00:00:00
abstract：:Impedance data, e.g., system responses, from perturbing small amplitude applied sinusoid signals of near DC to high kilohertz frequencies, give chemical information. Analysis of frequency-dependent imaginary and real impedance proceeds from equivalent analog circuit elements to chemical and physical significance deter...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02368537
更新日期：1992-01-01 00:00:00
abstract：:There is a significant clinical need for engineered bone graft substitutes that can quickly, effectively, and safely repair large segmental bone defects. One emerging field of interest involves the growth of engineered bone tissue in vitro within bioreactors, the most promising of which are perfusion bioreactors. Usin...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-016-1662-y
更新日期：2016-12-01 00:00:00
abstract：:It is proposed that the maximum in cuff pressure oscillations during oscillometry is due to the buckling of the brachial artery under a cuff. This theory is investigated by means of a mathematical model of oscillatometry that includes the mechanics of the occlusive arm cuff, the arterial pressure pulse waveform, and t...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02368225
更新日期：1994-01-01 00:00:00
abstract：:Abnormal scapular movement is widely believed to be an important factor in clinical pathology of the shoulder joint complex. Validated non-invasive techniques for measuring scapular movement have been developed, but the effect of marker placement on accuracy is unknown. The objective of this study was to determine the...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-010-0185-1
更新日期：2011-02-01 00:00:00
abstract：:Blunt carotid artery injuries occur in 0.3% of blunt injured patients and may lead to devastating neurological consequences. However, arterial mechanics leading to internal layer subfailure have not been quantified. Twenty-two human carotid artery segments and 18 porcine thoracic aorta segments were opened to expose t...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-006-9229-y
更新日期：2007-02-01 00:00:00
abstract：:Additive manufacturing, also known as 3D printing, has emerged over the past 3 decades as a disruptive technology for rapid prototyping and manufacturing. Vat polymerization, powder bed fusion, material extrusion, and binder jetting are distinct technologies of additive manufacturing, which have been used in a wide va...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章,评审
doi：10.1007/s10439-016-1678-3
更新日期：2017-01-01 00:00:00
abstract：:Elastin is an essential component of arteries which provides structural integrity and instructs smooth muscle cells to adopt a quiescent state. Despite interaction of endothelial cells with elastin in the internal elastic lamina, the potential for exploiting this interaction therapeutically has not been explored in de...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-010-0142-z
更新日期：2011-01-01 00:00:00
abstract：:Intramuscular pressure (IMP) shows promise for estimating individual muscle tension in vivo. However, previous pressure measurements show high variability during isometric contraction and poor correlation with tension during dynamic contraction. We hypothesized that enhanced sensor anchoring/orientation would improve ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-020-02633-7
更新日期：2021-02-01 00:00:00
abstract：:For an optimal guidance of the rehabilitation therapy of stroke patients in an in-home setting, objective, and patient-specific performance assessment of arm movements is needed. In this study, metrics of hand movement relative to the pelvis and the sternum were estimated in 13 stroke subjects using a full body ambula...
journal_title：Annals of biomedical engineering
pub_type： 临床试验,杂志文章
doi：10.1007/s10439-014-1198-y
更新日期：2015-02-01 00:00:00
abstract：:The relationship between laboratory and on-field performance of football helmets was assessed for 31 football helmet models selected from those worn by players in the 2015-2019 National Football League (NFL) seasons. Linear impactor tests were conducted with helmets placed on an instrumented Hybrid III head and neck a...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-020-02627-5
更新日期：2020-11-01 00:00:00
abstract：:We have studied the interaction of high frequency jet ventilation with cardiovascular pressures and flows. Results in dogs show that the amplitude of all intrathoracic pressures and flows fluctuate with a frequency equal to the difference between the heart rate and ventilator rate. The magnitude of this amplitude vari...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02584287
更新日期：1987-01-01 00:00:00
abstract：:The extent to which sensorineural systems such as the auditory system are nonlinear depends on the type of stimulus that is used, and the part of the system from which recordings are made. An estimate of the first-order Wiener kernel of the evoked response from the inferior colliculus to amplitude-modulated tones and ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02367379
更新日期：1988-01-01 00:00:00
