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Search Results: 1 - 10 of 200717 matches for " Jonathan D. Baum "
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Life after Addiction—Post-Operative Pain Management in an Obstetrical Patient on Long-Term Buprenorphine Therapy  [PDF]
Kelly R Bowen, Jonathan D Baum
Open Journal of Obstetrics and Gynecology (OJOG) , 2017, DOI: 10.4236/ojog.2017.79096
Abstract: A G6P2032 female, prior cesarean x3 with history of opioid addiction maintained on buprenorphine presented for scheduled repeat cesarean section. Pre-operatively, her maintenance dose of medication was held secondary to concerns for partial agonist effect. Post-operative pain control was suboptimal with the patient ultimately proceeding to withdrawal. Doses of hydromorphone were titrated to 10 mg every 3 hours to avoid further withdrawal. Review of expert opinion after discharge recommended against holding buprenorphine therapy in the post-operative period. Pain management options include maintenance therapy with additional doses of opioid and non-opioid pain relieving medications.
Travel in Pregnancy: The Impact of Zika  [PDF]
Erin E. Curcio, Jonathan D. Baum, Debra Gussman, Mark Martens
Open Journal of Obstetrics and Gynecology (OJOG) , 2017, DOI: 10.4236/ojog.2017.710107
Abstract: OBJECTIVE: The purpose of our study was to examine current travel patterns and behaviors of pregnant women. METHODS: We developed a questionnaire adapted from a publication by Kingman and Economides to examine the travel behavior of women during pregnancy in a suburban community. RESULTS: A convenience sample of 102 patients completed the travel questionnaire. Forty-six (45.1%) traveled during the current pregnancy. Thirty-one (30.4%) traveled more than once. A total of 257 trips were taken by the participants: 113 (43.9%) trips were taken in the first trimester, 87 (33.8%) in the second and 59 (22.9%) in the third trimester. Trip length ranged from 2-90 days with a mean of 11 days. Reasons for travel included: 193 (75.1%) for leisure, 37 (14.4%) work related, 10 (3.9%) trips for emergencies, and 3 (0.4%) trips for relocation.?Eighteen women (17.6%) traveled internationally. One (1.0%) woman was hospitalized while traveling. Manner of travel was as follows: car 167 (65.0%), plane 67 (26.1%), train 13 (5.1) %, bus 10 (3.9%) and none by boat. Nineteen (41.3%) women sought travel advice. Thirteen (68.4%) asked for advice from a doctor, 2 (10.5%) from a nurse, 2 (10.5%) from family and/or friends, 1 (5.3%) from the Internet and 1 (5.3%) from a travel book. Seventeen (37%), traveled without suitable insurance. DISCUSSION: Travel rates during pregnancy have remained surprisingly stable over the past 60 years. Almost 50% of our cohort traveled during pregnancy, and the majority did not seek advice prior to travel. In light of new infectious disease threats, obstetric practice and advice needs reassessment. The majority of travel during pregnancy remains optional. Improved patient education and consultations prior to travel could decrease health risks.
Use of an Intubating Stylet as a Guide to Complete Uterine Curettage Complicated by Uterine Perforation
Jonathan D. Baum,Douglas J. Sherlock,Andrew L. Atkinson
Case Reports in Obstetrics and Gynecology , 2013, DOI: 10.1155/2013/195383
Abstract: Completion of uterine curettage may be challenging following uterine perforation even under sonographic and laparoscopic monitoring. This report illustrates the use of a flexible intubating stylet as a guide to place the suction curette into the uterine cavity when sonography and laparoscopy alone are not successful. Use of a malleable instrument such as an intubating stylet as a guide should be considered an option when insertion of the suction curette into the uterine cavity is complicated by anatomic variation and uterine perforation. 1. Introduction The most common complication of dilation and curettage is uterine perforation with an incidence ranging from 2 to 19.8 per 1000 procedures [1–4]. Risk factors for uterine perforation include resident physician performance of the procedure, multiparity, advancing gestational age, general anesthesia, and retroversion of the uterus [2, 4]. In 1958, Word et al. wrote of the fallacy of simple uterine curettage commenting that the procedure may exhaust even the most experienced gynecologist [3]. Multiple authors have recommended completion of a difficult uterine curettage be done under ultrasound guidance, laparoscopic visualization, or both [2, 4–6]. 2. Case 26-year-old female gravida 3 para 2 underwent suction curettage for a missed abortion at 6-7 weeks of gestation determined by transvaginal ultrasound. Past history was significant for two prior cesarean deliveries. Her body mass index was normal. Examination under anesthesia revealed a retroverted uterus about 8 weeks size with limited mobility presumably due to adhesions. The cervix was dilated, and an 8?mm curved curette was placed. Suction curettage was performed, but no products of conception were obtained. Transabdominal ultrasound showed an intact gestational sac at the fundus; however, the suction curette was noted to be passing between the uterus and the bladder suggesting uterine perforation. Attempts to direct the suction curette away from the false tract and toward the gestational sac were not successful. A 10-French intubating stylet was shaped to approximate the degree of uterine retroversion and was directed successfully into the uterine cavity under sonographic monitoring. The suction curette was then threaded over the stylet into the uterine cavity (Figure 1). The curettage was then completed under laparoscopic visualization. The stylet was redirected into the false tract, and uterine perforation was confirmed in an area of extensive cohesive adhesions between the uterus and bladder (Figure 2). No other internal injuries were noted. The
Clinical Presentation and Conservative Management of Tympanic Membrane Perforation during Intrapartum Valsalva Maneuver
Jonathan D. Baum,Meghan I. Rattigan,Eric Scott Sills,Anthony P. H. Walsh
Case Reports in Medicine , 2010, DOI: 10.1155/2010/856045
Abstract: Background. Tympanic membrane perforation may occur when ear pressures are excessive, including valsalva maneuver associated with active labor and vaginal delivery. A pressure differential across the eardrum of about 5 psi can cause rupture; the increased intraabdominal pressure spikes repeatedly manifested by “pushing” during second-stage labor easily approach (and may exceed) this level. Material and Method. We describe a healthy 21-year old nulliparous patient admitted in active labor at 39-weeks' gestational age. Results. Blood appeared asymptomatically in the left ear canal at delivery during active, closed-glottis pushing. Otoscopic examination confirmed perforation of the left tympanic membrane. Complete resolution of the eardrum rupture was noted at postpartum check-up six weeks later. Conclusion. While the precise incidence of intrapartum tympanic membrane rupture is not known, it may be unrecognized without gross blood in the ear canal or subjective hearing loss following delivery. Only one prior published report on tympanic membrane perforation during delivery currently appears in the medical literature; this is the first English language description of the event. Since a vigorous and repetitive valsalva effort is common in normal vaginal delivery, clinicians should be aware of the potential for otic complications associated with the increased intraabdominal pressure characteristic of this technique.
Is Humanity Doomed? Insights from Astrobiology
Seth D. Baum
Sustainability , 2010, DOI: 10.3390/su2020591
Abstract: Astrobiology, the study of life in the universe, offers profound insights into human sustainability. However, astrobiology is commonly neglected in sustainability research. This paper develops three topics connecting astrobiology to sustainability: constraints on what zones in the universe are habitable, the absence of observations of extraterrestrial civilizations, and the physical fate of the universe. These topics have major implications for our thinking and action on sustainability. While we may not be doomed, we must take certain actions to sustain ourselves in this universe. The topics also suggest that our current sustainability efforts may be of literally galactic importance.
The Kernel-SME Filter for Multiple Target Tracking
Marcus Baum,Uwe D. Hanebeck
Computer Science , 2012,
Abstract: We present a novel method called Kernel-SME filter for tracking multiple targets when the association of the measurements to the targets is unknown. The method is a further development of the Symmetric Measurement Equation (SME) filter, which removes the data association uncertainty of the original measurement equation with the help of a symmetric transformation. The underlying idea of the Kernel-SME filter is to construct a symmetric transformation by means of mapping the measurements to a Gaussian mixture. This transformation is scalable to a large number of targets and allows for deriving a Gaussian state estimator that has a cubic time complexity in the number of targets.
Extended Object Tracking with Random Hypersurface Models
Marcus Baum,Uwe D. Hanebeck
Computer Science , 2013,
Abstract: The Random Hypersurface Model (RHM) is introduced that allows for estimating a shape approximation of an extended object in addition to its kinematic state. An RHM represents the spatial extent by means of randomly scaled versions of the shape boundary. In doing so, the shape parameters and the measurements are related via a measurement equation that serves as the basis for a Gaussian state estimator. Specific estimators are derived for elliptic and star-convex shapes.
The Summation of One Class of Infinite Series  [PDF]
Jonathan D. Weiss
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.517269
Abstract: This paper presents closed-form expressions for the series, \"\", where the sum is from n = 1 to n = ∞. These expressions were obtained by recasting the series in a different form, followed by the use of certain relationships involving the elliptical nome. Among the values of x for which these expressions can be obtained are of the form: \"\" and \"\", where l is an integer between ∞ and ∞. The values of λ include 1,\"\",\"\"and 3. Examples of closed-form expressions obtained in this manner are first presented for \"\", \"\", \"\", and \"\". Additional examples are then presented for \"\", \"\", \"\", and \"\". This undertaking was prompted by the author’s work on an electrostatics boundary-value problem related to the van der Pauw measurement technique of electrical resistivity. The presence of this series for x = \"\" in the solution of that problem and its absence from any compendium of infinite series that he consulted led to this work.
The Gravitational Attraction between Hemispherical Masses  [PDF]
Jonathan D. Weiss
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.86064
Abstract: This paper is a study of the gravitational attraction between two uniform hemispherical masses aligned such that the pair is cylindrically symmetric. Three variations are considered: flat side to flat side, curved side to curved side, and flat side to curved side. Expressions for the second and third variation are derived from the first, with the use of superposition and the well-known gravitational behavior of a spherical mass as equivalent to a point mass at its center. The study covers two masses of equal diameter and of different diameters, such that one is four times that of the other. Calculations are done for separations from zero to fifty times the radius of the larger of the two, which is effectively the asymptotic limit. It is demonstrated that at any separation, the force can be expressed as if the two hemispheres were point masses separated by a certain distance. Expressions for that distance and the location of the (fictitious) point masses within each hemisphere are presented. Unlike the case of two spherical masses, the location within their respective hemisphere is not necessarily the same for each point and both are dependent upon the separation between the two hemispheres. The calculation for the first variation is done in two ways. The first is a “brute force” multi-dimensional integral with the help of Wolfram Mathematica. The second is an axial expansion for the potential modified for off-axis locations by Legendre polynomials. With only a few terms in the expansion, the results of the second method are in extremely good agreement with those of the first. Finally, an interesting application to a split earth is presented.
Certain Aspects of the Gravitational Field of a Disk  [PDF]
Jonathan D. Weiss
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.912089
There are at least two reasons why one would study the gravitational field of a disk. The first is that many astronomical objects, such as spiral galaxies like the Milky Way, are disk-like. The second is that the field of a disk is interesting, particularly when compared to that of a spherical, or near-spherical, object, which is much easier to analyze because of its high degree of symmetry. It is hoped that this study will augment previous work on this subject. The aspects presented in this paper are as follows: 1) both the radial and vertical gravitational fields of a thin disk within the plane of the disk and above it; 2) a comparison of some of the field results obtained by Lass and Blitzer (1983) involving elliptic integrals to those obtained by a standard numerical integration, now available online, and separately through the use of Legendre polynomials; 3) the logarithmic divergence of the radial field at the edge of a thin disk; 4) the fields in the plane of a disk containing a central hole, particularly within the hole, such as the rings of Saturn; 5) circular orbits within the plane of a single disk and half way between two disks, and their stability; 6) the escape velocity at a point within the Milky Way, particularly at the position of the solar system and without any added, or subtracted, orbital effects around the galactic center; and 7) the radial field at the circular edge of a disk of finite thickness.
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