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Xylazine is an animal sedative, approved by the U.S. Food and Drug Administration, that is commonly used in veterinary medicine and is not approved for human use. Since 2016, xylazine has consistently appeared in the illicitly manufactured fentanyl supply and has significantly increased in prevalence, likely due to its low cost, easy availability, and presumed synergistic psychoactive effect. Clinical experience along with the available pertinent research were used to review xylazine adulteration of the drug supply and provide guidance on the care of patients exposed to xylazine. This review discusses xylazine pharmacology, animal and human clinical effects, and what is known to date about care of patients experiencing acute overdose, xylazine–fentanyl withdrawal, and xylazine-associated wounds.

The Pendulum Swings on Glucocorticoids in Rheumatoid Arthritis

Cumulative All-Cause Mortality in Diverse Hispanic/Latino Adults: A Prospective, Multicenter Cohort Study: Annals of Internal Medicine: Vol 177, No 3

Background: All-cause mortality among diverse Hispanic/Latino groups in the United States and factors underlying mortality differences have not been examined prospectively. Objective: To describe cumulative all-cause mortality (and factors underlying differences) by Hispanic/Latino background, before and during the COVID-19 pandemic. Design: Prospective, multicenter cohort study. Setting: Hispanic Community Health Study/Study of Latinos. Participants: 15 568 adults aged 18 to 74 years at baseline (2008 to 2011) of Central American, Cuban, Dominican, Mexican, Puerto Rican, South American, and other backgrounds from the Bronx, New York; Chicago, Illinois; Miami, Florida; and San Diego, California. Measurements: Sociodemographic, acculturation-related, lifestyle, and clinical factors were assessed at baseline, and vital status was ascertained through December 2021 (969 deaths; 173 444 person-years of follow-up). Marginally adjusted cumulative all-cause mortality risks (11-year before the pandemic and 2-year during the pandemic) were examined using progressively adjusted Cox regression. Results: Before the pandemic, 11-year cumulative mortality risks adjusted for age and sex were higher in the Puerto Rican and Cuban groups (6.3% [95% CI, 5.2% to 7.6%] and 5.7% [CI, 5.0% to 6.6%], respectively) and lowest in the South American group (2.4% [CI, 1.7% to 3.5%]). Differences were attenuated with adjustment for lifestyle and clinical factors. During the pandemic, 2-year cumulative mortality risks adjusted for age and sex ranged from 1.1% (CI, 0.6% to 2.0%; South American) to 2.0% (CI, 1.4% to 3.0%; Central American); CIs overlapped across groups. With adjustment for lifestyle factors, 2-year cumulative mortality risks were highest in persons of Central American and Mexican backgrounds and lowest among those of Puerto Rican and Cuban backgrounds. Limitation: Lack of data on race and baseline citizenship status; correlation between Hispanic/Latino background and site. Conclusion: Differences in prepandemic mortality risks across Hispanic/Latino groups were explained by lifestyle and clinical factors. Mortality patterns changed during the pandemic, with higher risks in persons of Central American and Mexican backgrounds than in those of Puerto Rican and Cuban backgrounds. Primary Funding Source: National Institutes of Health.

Cumulative Incidence of Thiazide-Induced Hyponatremia: A Population-Based Cohort Study: Annals of Internal Medicine: Vol 177, No 1

Background: According to drug labels, the frequency of thiazide-induced hyponatremia is unknown or uncommon to very rare (that is, <1 in 10 000 to <1 in 100), but the exact burden remains unclear. Objective: To estimate the increase in the cumulative incidence of hyponatremia using thiazide diuretics compared with nonthiazide antihypertensive drugs in routine clinical practice. Design: Population and register-based cohort study using target trial emulation. Setting: Denmark, 1 January 2014 to 31 October 2018. Participants: Two target trials were emulated among persons aged 40 years or older who had no recent prescription for any antihypertensive drug, had no previous hyponatremia, and were eligible for the studied antihypertensive treatments. The first target trial emulation compared new use of bendroflumethiazide (BFZ) versus a calcium-channel blocker (CCB). The second target trial emulation compared new use of hydrochlorothiazide plus a renin–angiotensin system inhibitor (HCTZ–RASi; that is, combination pill) versus a RASi alone. Measurements: Two-year cumulative incidences of sodium levels less than 130 mmol/L using stabilized inverse probability of treatment–weighted survival curves. Results: The study compared 37 786 new users of BFZ with 44 963 of a CCB and 11 943 new users of HCTZ–RASi with 85 784 of a RASi. The 2-year cumulative incidences of hyponatremia were 3.83% for BFZ and 3.51% for HCTZ–RASi. The risk differences were 1.35% (95% CI, 1.04% to 1.66%) between BFZ and CCB and 1.38% (CI, 1.01% to 1.75%) between HCTZ–RASi and RASi; risk differences were higher with older age and higher comorbidity burden. The respective hazard ratios were 3.56 (CI, 2.76 to 4.60) and 4.25 (CI, 3.23 to 5.59) during the first 30 days since treatment initiation and 1.26 (CI, 1.09 to 1.46) and 1.29 (CI, 1.05 to 1.58) after 1 year. Limitation: The study assumed that filled prescriptions equaled drug use, and residual confounding is likely. Conclusion: Treatment initiation with thiazide diuretics suggests a more substantial excess risk for hyponatremia, particularly during the first months of treatment, than indicated by drug labeling. Primary Funding Source: Independent Research Fund Denmark.

Association of State Insulin Out-of-Pocket Caps With Insulin Cost-Sharing and Use Among Commercially Insured Patients With Diabetes: A Pre–Post Study With a Control Group: Annals of Internal Medicine: Vol 177, No 4

Background: Twenty-five states have implemented insulin out-of-pocket (OOP) cost caps, but their effectiveness is uncertain. Objective: To examine the effect of state insulin OOP caps on insulin use and OOP costs among commercially insured persons with diabetes. Design: Pre–post study with control group. Setting: Eight states implementing insulin OOP caps of $25 to $30, $50, or $100 in January 2021, and 17 control states. Participants: Commercially insured persons with diabetes and insulin users younger than 65 years. Subgroups of particular interest included members from states with insulin OOP caps of $25 to $30, enrollees with health savings accounts (HSAs) that require high insulin OOP payments, and lower-income members. Measurements: Mean monthly 30-day insulin fills and OOP costs. Results: State insulin caps were not associated with changes in insulin use in the overall population (relative change in fills per month, 1.8% [95% CI, −3.2% to 6.9%]). Insulin users in intervention states saw a 17.4% (CI, −23.9% to −10.9%) relative reduction in insulin OOP costs, largely driven by reductions among HSA enrollees; there was no difference in OOP costs among nonaccount plan members. More generous ($25 to $30) state insulin OOP caps were associated with insulin OOP cost reductions of 40.0% (CI, −62.5% to −17.6%), again primarily driven by a larger reduction in the subgroup with HSA plans. Limitations: Single national insurer; 9-month follow-up. Conclusion: Insulin OOP caps were associated with reduced insulin OOP costs but no overall increases in insulin use. A proposed national insulin cap of $35 for commercially insured persons might lead to meaningful insulin OOP savings but have a limited effect on insulin use. Primary Funding Source: Centers for Disease Control and Prevention and National Institute of Diabetes and Digestive and Kidney Diseases.

Trends in Primary Prevention Statin Use by Cardiovascular Risk Score From 1999 to 2018: A Repeated Cross-Sectional Study

Health as a Human Right: A Position Paper From the American College of Physicians

The relationship of health to rights or human rights is complex. Although many find no right of any kind to health or health care, and others view health care as a right or human right, the American College of Physicians (ACP) instead sees health as a human right. The College, in the ACP Ethics Manual, has long noted the interrelated nature of health and human rights. Health as a human right also has implications for the social and structural determinants of health, including health care. Any rights framework is imperfect, and rights, human rights, and ethical obligations are not synonymous. Individual physicians and the profession have ethical obligations to patients, and these obligations can go beyond matters of rights. Society, too, has responsibilities—the equitable and universal access to appropriate health care is an ethical obligation of a just society. By recognizing health as a human right based in the intrinsic dignity and equality of all patients and supporting the patient–physician relationship and health systems that promote equitable access to appropriate health care, the United States can move closer to respecting, protecting, and fulfilling for all the opportunity for health.

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