Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
Pain in Perspective 94percent of community dwelling adults aged 60 years or above have been found to experience pain and this number increases to 45-80% in the nursing home population with analgesics being used in 40% to 50% of residents [1,[13][14][15][16][17][18][19]. Brown et al report higher percentage and state that more than 90% of the elderly living in the community experienced pain within the past month [6]. Given the prevalence of chronic pain, its impact on health, and its costs, which approach $100 billion annually, chronic pain represents a major public health issue [20].While the existence of acute pain remains approximately the same across the adult life span, there is an age-related increase in the prevalence of chronic pain at least until the seventh decade of life [13,15]. Approximately 57% of older adults report experiencing pain for 1 or more years compared with less than 45% of younger people. Furthermore, long-term care data indicate that over 40% of patients, who were known to have pain at an initial assessment, had worsening or severe pain at the time of the second assessment 2-6 months later [21]. Chronic musculoskeletal painChronic musculoskeletal pain (CMP) is the most common, non-malignant disabling condition that affects at least one in four older people [22,23]. The most musculoskeletal pain in the joints of the upper and lower extremities, especially hips, knees, and hands, is associated with the degenerative changes of osteoarthritis. Older adults may also develop tendonitis and bursitis, as well as inflammatory joint and muscle disease [24]. The most common painful musculoskeletal conditions among older adults are osteoarthritis, low back pain, fibromyalgia, chronic shoulder pain, knee pain, myofascial pain syndrome and previous fracture sites [7,23,25].It is reported that the most common causes of pain identified in nursing home patients included arthritis and previous fractures. Arthritis alone affects well over 20 million Americans with an increase to 40 million expected by 2020. Twenty-nine percent of Medicare patients in nursing homes with a fracture in the prior 6 months suffer with daily pain [13]. Also surgical procedures are more frequently performed on older people. In the Medicare population in the United States for example, rates of total joint replacement surgery for patients with severe hip or knee osteoarthritis are more than doubled between 1988 and 1997. Over the same time period, rates of spine surgery in Medicare patients increased by 57% [23]. Chronic low back pain (CLBP) is one of the most common, poorly understood, and potentially disabling chronic pain condition s i n o l d e r a d u l t s [ 2 6 ] . M a n y o l d e r a d u l t s r e m a i n q u i t e functional despite CLBP, and because age-related co-morbidities often exist independently of pain, the unique impact of CLBP is unknown [27]. The Framingham Study (1992-1993 reported 63% of women pain in one or more regions, compared to 52% of men. Widespread CMP was more prevalent among women than men (15 versu...
Pain in Perspective 94percent of community dwelling adults aged 60 years or above have been found to experience pain and this number increases to 45-80% in the nursing home population with analgesics being used in 40% to 50% of residents [1,[13][14][15][16][17][18][19]. Brown et al report higher percentage and state that more than 90% of the elderly living in the community experienced pain within the past month [6]. Given the prevalence of chronic pain, its impact on health, and its costs, which approach $100 billion annually, chronic pain represents a major public health issue [20].While the existence of acute pain remains approximately the same across the adult life span, there is an age-related increase in the prevalence of chronic pain at least until the seventh decade of life [13,15]. Approximately 57% of older adults report experiencing pain for 1 or more years compared with less than 45% of younger people. Furthermore, long-term care data indicate that over 40% of patients, who were known to have pain at an initial assessment, had worsening or severe pain at the time of the second assessment 2-6 months later [21]. Chronic musculoskeletal painChronic musculoskeletal pain (CMP) is the most common, non-malignant disabling condition that affects at least one in four older people [22,23]. The most musculoskeletal pain in the joints of the upper and lower extremities, especially hips, knees, and hands, is associated with the degenerative changes of osteoarthritis. Older adults may also develop tendonitis and bursitis, as well as inflammatory joint and muscle disease [24]. The most common painful musculoskeletal conditions among older adults are osteoarthritis, low back pain, fibromyalgia, chronic shoulder pain, knee pain, myofascial pain syndrome and previous fracture sites [7,23,25].It is reported that the most common causes of pain identified in nursing home patients included arthritis and previous fractures. Arthritis alone affects well over 20 million Americans with an increase to 40 million expected by 2020. Twenty-nine percent of Medicare patients in nursing homes with a fracture in the prior 6 months suffer with daily pain [13]. Also surgical procedures are more frequently performed on older people. In the Medicare population in the United States for example, rates of total joint replacement surgery for patients with severe hip or knee osteoarthritis are more than doubled between 1988 and 1997. Over the same time period, rates of spine surgery in Medicare patients increased by 57% [23]. Chronic low back pain (CLBP) is one of the most common, poorly understood, and potentially disabling chronic pain condition s i n o l d e r a d u l t s [ 2 6 ] . M a n y o l d e r a d u l t s r e m a i n q u i t e functional despite CLBP, and because age-related co-morbidities often exist independently of pain, the unique impact of CLBP is unknown [27]. The Framingham Study (1992-1993 reported 63% of women pain in one or more regions, compared to 52% of men. Widespread CMP was more prevalent among women than men (15 versu...
Some massive, merging black holes (BH) may be descendants of binary O stars. The evolution and mass transfer between these O stars determines the spins of their progeny BH. These will be measurable with future gravitational wave detectors, incentivizing the measurement of the spins of O stars in binaries. We previously measured the spins of O stars in Galactic Wolf-Rayet (WR) + O binaries. Here we measure the v e sini of four LMC and two SMC O stars in WR + O binaries to determine whether lower metallicity might affect the spin rates. We find that the O stars in Galactic and Magellanic WR + O binaries display average v e sini = 258 ± 18 km/s and 270 ± 15 km/s, respectively. Two LMC O stars measured on successive nights show significant line width variability, possibly due to differing orbital phases exhibiting different parts of the O stars illuminated differently by their WR companions. Despite this variability, the v e sini are highly super-synchronous but distinctly subcritical for the O stars in all these binaries; thus we conclude that an efficient mechanism for shedding angular momentum from O stars in WR + O binaries must exist. This mechanism, probably related to Roche lobe overflow-created dynamo magnetic fields, prevents nearly 100% breakup spin rates, as expected when RLOF operates, as it must, in these stars. A Spruit-Tayler dynamo and O star wind might be that mechanism.
The black holes (BH) in merging BH-BH binaries are likely progeny of binary O stars. Their properties, including their spins, will be strongly influenced by the evolution of their progenitor O stars. The remarkable observation that many single O stars spin very rapidly can be explained if they accreted angular momentum from a mass-transferring, O-type or Wolf-Rayet companion before that star blew up as a supernova. To test this prediction, we have measured the spin rates of eight O stars in Wolf-Rayet (WR) + O binaries, increasing the total sample size of such O stars' measured spins from two to ten. Polarimetric and other determinations of these systems' sin i allow us to determine an average equatorial rotation velocity from HeI (HeII) lines of v e = 348 (173) km/s for these O stars, with individual star's v e from HeI (HeII) lines ranging from 482 (237) to 290 (91) km/s. We argue that the ∼ 100% difference between HeI and HeII speeds is due to gravity darkening. Super-synchronous spins, now observed in all 10 O stars in WR + O binaries where it has been measured, are strong observational evidence that Roche lobe overflow mass transfer from a WR progenitor companion has played a critical role in the evolution of WR+OB binaries. While theory predicts that this mass transfer rapidly spins-up the O-type mass gainer to a nearly break-up rotational velocity v e ∼ 530 km/s, the observed average v e of the O-type stars in our sample is 65% that speed. This demonstrates that, even over the relatively short WR-phase timescale, tidal and/or other effects causing rotational spin-down must be efficient. A challenge to tidal synchronization theory is that the two longest-period binaries in our sample (with periods of 29.7 and 78.5 days) unexpectedly display super-synchronous rotation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.