Showing posts with label toxicology. Show all posts
Showing posts with label toxicology. Show all posts

Tuesday, April 02, 2019

Extended infusion protocols for piperacillin-tazobactam (PTZ): do they mitigate nephrotoxicity?


Not in this study. From the paper:

Our findings suggest a similar rate of nephrotoxicity between patients who received vancomycin in combination with PTZ EI versus PTZ SI. These results need to be further validated in a prospective randomized controlled study.

A little background on thalidomide



Thalidomide is a drug with interesting therapeutic properties but also with severe side effects which require a careful and monitored use. Potential immunomodulatory, antiinflammatory, anti-angiogenic and sedative properties make thalidomide a good candidate for the treatment of several diseases such as multiple myeloma. Through an increase in the degradation of TNFα-mRNA, thalidomide reduces the production of TNFα by monocytes and macrophages stimulated by lipopolysaccharide or by T lymphocytes induced by mitogenic stimuli. The decreased level of TNFα alters the mechanisms of intracellular transduction by preventing the activation of NF-kB and by decreasing the synthesis of proteins, in particular IL-6, involved in cell proliferation, inflammation, angiogenesis and protection from apoptosis. Furthermore, thalidomide affects VEGF levels by down-regulating its expression. Nowadays, new safer and less toxic drugs, analogs of thalidomide, are emerging as beneficial for a more targeted treatment of multiple myeloma and several other diseases such as Crohn';s disease, rheumatoid arthritis, sarcoidosis, erythema nodosum leprosum, graft-versus-host disease.

Wednesday, February 13, 2019

Severe carisoprodol withdrawal


Wednesday, October 10, 2018

Adrenal insufficiency due to chronic opiate use



Available data from small heterogeneous studies suggest that 9% to 29% of patients receiving long-term treatment with opiates have development of adrenal insufficiency. However, predictors and the timing of the OIAI onset are unclear. Given the widespread use of narcotics in every field of medicine, physicians should be aware of the potential for endocrine-related adverse effects, in particular OIAI. We suggest careful consideration of OIAI in any patient receiving long-term opiate therapy who manifests symptoms and signs suggestive of adrenal insufficiency. Prospective large studies need to be designed with the goals of elucidating factors associated with OIAI, developing the best approach to case detection of OIAI, and establishing an appropriate management and monitoring plan.



Friday, September 28, 2018

Wednesday, September 19, 2018

Methamphetamine and pulmonary hypertension


This review describes the recently discovered association.

Saturday, September 08, 2018

Drug induced lupus


Tuesday, September 04, 2018

Concerns about adverse effects of PPIs: current status




First introduced in 1989, proton pump inhibitors (PPIs) are among the most widely utilized medications worldwide, both in the ambulatory and inpatient clinical settings. The PPIs are currently approved by the US Food and Drug Administration for the management of a variety of gastrointestinal disorders including symptomatic peptic ulcer disease, gastroesophageal reflux disease, and nonulcer dyspepsia as well as for prevention of gastrointestinal bleeding in patients receiving antiplatelet therapy. PPIs inhibit gastric acid secretion, and the most commonly associated adverse effects include abdominal pain, diarrhea, and headache. Although PPIs have had an encouraging safety profile, recent studies regarding the long-term use of PPI medications have noted potential adverse effects, including risk of fractures, pneumonia, Clostridium difficile diarrhea, hypomagnesemia, vitamin B12 deficiency, chronic kidney disease, and dementia. These emerging data have led to subsequent investigations to assess these potential risks in patients receiving long-term PPI therapy. However, most of the published evidence is inadequate to establish a definite association between PPI use and the risk for development of serious adverse effects. Hence, when clinically indicated, PPIs can be prescribed at the lowest effective dose for symptom control.


Monday, September 03, 2018

Andexxa approved for reversal of NOACs (direct Xa infibitors)


Friday, June 15, 2018

Methamphetamine related heart failure: rising prevalence, distinct phenotype



Hypothesis: We hypothesized that in a VA population over a 15 year period, we would observe a rising prevalence of MethHF in admitted patients, along with a unique phenotype.

Methods: Among 9588 patients with diagnosis of heart failure treated at San Diego VA Medical Center in between 2005-2015, 480 were identified to have history of methamphetamine abuse as determined by ICD-9 diagnosis code and/or urine toxicology screen as well as a diagnosis code of heart failure. Demographic, diagnostic, and clinical characteristics of MethHF and heart failure patients without methamphetamine use (HF) were compared. ..

Results: From 2005-2015, the prevalence of methamphetamine usage among patients with heart failure increased linearly (Figure 1). A preliminary cohort comparison demonstrated MethHF had similar ejection fraction and BNP levels but trends toward increased troponin levels, more atrial fibrillation, and a higher GFR. MethHF patients had a greater risk of ER visits (2.3 per year vs 0.5 per year, p=0.01) and a trend towards a greater risk of all-cause hospital readmission...

Friday, April 27, 2018

Medical cannabis laws related to increased illicit use and use disorders


Saturday, April 07, 2018

Valproic acid overdose


Saturday, February 17, 2018

Local anesthetic toxicity


Monday, September 11, 2017

The ER ECG in drug overdose


Saturday, July 22, 2017

Heavy cannabis use: bad for bone health




The effects of cannabinoids on bone mass and bone turnover in humans are unknown.

Using a cross-sectional study design we found that heavy cannabis use is associated with low body mass index, high bone turnover, low bone density, and an increased risk of fracture.

Heavy cannabis use has a detrimental effect on bone health by a direct effect on the skeleton and an indirect effect mediated by low body mass index.

Friday, May 26, 2017

Encephalopathy secondary to metronidazole


Here is a case presentation and brief discussion in NEJM (free full text). From the paper:

Encephalopathy associated with metronidazole use is an uncommon side effect of the medication. It typically manifests as dysarthria and gait instability. Risk factors include liver dysfunction and a prolonged course of metronidazole (typical cumulative dose, greater than 20 g). MRI of the brain is usually diagnostic and typically reveals a symmetric, enhanced FLAIR signal in the dentate nuclei of the cerebellum.


Monday, February 06, 2017

Monday, April 04, 2016

Are pre-4 hour APAP levels helpful in acute overdose?


They may be of some help, and allow for certain predictions, but do not supplant the need for a 4 hour post-ingestion level and application of the nomogram. This topic is nicely reviewed at Academic Life in Emergency Medicine.

Some cases are not easily applicable to the nomogram (e.g. unknown ingestion time, gradual ingestion over time, transaminases already elevated, etc). Up to Date has a nice section on these situations.

Monday, February 29, 2016

Trends in the use of physostigmine for anticholinergic overdose


Here's a new study from the Division of Emergency Medicine at Washington University, drawing on a large toxicology database, looking at the treatment of patients with anticholinergic toxicity. From the paper:

The anticholinergic toxidrome is well described and relatively common. Despite controversy, studies have shown that physostigmine is relatively safe and effective in reversing this toxidrome. We would expect toxicologists would be liberal in its use. We retrospectively analyzed data in the Toxicology Investigators Consortium (ToxIC) registry, representing data from medical toxicologists in multiple institutions nationwide, searching for patients who exhibited an anticholinergic toxidrome, determining what treatment(s) they received, and classifying the treatments as physostigmine, benzodiazepines, physostigmine and benzodiazepines, antipsychotics, or no definitive treatment. The causal agents of the toxidrome were as reported by the treating toxicologist. Eight hundred fifteen consecutive patients with anticholinergic toxidromes were analyzed. Benzodiazepines alone were given in 28.7 %, 12.4 % were given physostigmine alone, 8.8 % received both physostigmine and benzodiazepines, 2.7 % were given antipsychotics, and 47.4 % were given no definitive treatment. In patients who received only physostigmine, there was a significant difference in the rate of intubation (1.9 vs. 8.4 %, OR 0.21, 95 % CI 0.05-0.87) versus other treatment groups. Physostigmine was given at varying rates based on causative agent with use in agents with mixed or unknown effects (15.1 %) being significantly lower than those with primarily anticholinergic effects (26.6 %) (p less than 0.001). Patients with anticholinergic toxicity were more likely to receive benzodiazepines than physostigmine. Those patients who received only physostigmine had a significantly lower rate of intubation. Physostigmine was more likely to be used with agents exerting primarily anticholinergic toxicity than in those agents with multiple actions.

Physostigmine is making a comeback for this indication. It appears to be safe and very effective (markedly reduces the intubation rate) for patients with a pure anticholinergic toxidrome. Conservative use reported in the article for patients with a mixed toxidrome probably reflects hesitancy to use it in cases of TCA overdose where physostigmine carries a risk of adverse cardiac effects and seizures. I previously blogged this topic here.