In this episode, we review the clinical presentation, diagnosis, and treatment of uncomplicated urinary tract infections.

Key Concepts

1. Uncomplicated urinary tract infections (UTI) are defined as an infection localized to the bladder without any systemic signs or symptoms of infection in someone who is not immunocompromised, pregnant, catheterized, and has normal urologic anatomy.
2. UTIs are most commonly seen in younger women. E. coli is by far the most common urinary pathogen. Symptoms alone drive most of the diagnosis of UTI; however, urinalysis and urine culture can be helpful in some circumstances.
3. Nitrofurantoin (Macrobid) is recommended for men and women for first-line therapy in most patients. Fosfomycin, Bactrim, pivmecillinam, and certain B-lactams can be considered in certain circumstances. Women are usually treated for 3-5 days and men 5-7 days.
4. Some evidence suggests inferior clinical outcomes for B-lactam; however, the amount of data in general is lacking for B-lactams. Recommended B-lactams (aside from pivmecillinam) include amoxicillin/clavulanate, cephalexin, cefadroxil, cefpodoxime, and cefdinir.

References

1. Nelson Z, Aslan AT, Beahm NP, et al. Guidelines for the Prevention, Diagnosis, and Management of Urinary Tract Infections in Pediatrics and Adults: A WikiGuidelines Group Consensus Statement. JAMA Netw Open. 2024;7(11):e2444495. Published 2024 Nov 4. doi:10.1001/jamanetworkopen.2024.44495
2. Gupta K, Hooton TM, Naber KG, et al. International clinical practice guidelines for the treatment of acute uncomplicated cystitis and pyelonephritis in women: A 2010 update by the Infectious Diseases Society of America and the European Society for Microbiology and Infectious Diseases. Clin Infect Dis. 2011;52(5):e103-e120. doi:10.1093/cid/ciq257
3. Kurotschka PK, Gágyor I, Ebell MH. Acute Uncomplicated UTIs in Adults: Rapid Evidence Review. Am Fam Physician. 2024;109(2):167-174.
4. https://www.wikiguidelines.org/

In this episode, we review the pharmacology, indications, adverse effects, and unique drug characteristics of 5-HT3 receptor antagonists such as ondansetron (Zofran) and palonosetron (Aloxi).

Key Concepts

1. There are four 5-HT3 (serotonin subtype 3) receptor antagonists on the market: ondansetron, granisetron, dolasetron, and palonosetron. These have primarily been studied for acute chemotherapy-induced nausea and vomiting (within 24 hours of chemotherapy administration) and for post-operative nausea and vomiting.
2. When used for chemotherapy-induced nausea/vomiting, 5-HT3 receptor antagonists are given prior to chemotherapy (usually 30-60 minutes before) on day #1. They are not given on subsequent days because they are not as effective for delayed nausea and vomiting.
3. Palonosetron has the longest half-life, longer binding affinity to the 5-HT3 receptor, and trends towards having the best efficacy among the 5-HT3 receptor antagonists.
4. 5-HT3 receptor antagonists are associated with QTc prolongation and may cause headache, dizziness, constipation, or diarrhea. Their association with an increased risk of serotonin syndrome is controversial and not supported from a mechanistic perspective.

References

• Simino GP, Marra LP, Andrade EI, et al. Efficacy, safety and effectiveness of ondansetron compared to other serotonin-3 receptor antagonists (5-HT3RAs) used to control chemotherapy-induced nausea and vomiting: systematic review and meta-analysis. Expert Rev Clin Pharmacol. 2016;9(9):1183-1194. doi:10.1080/17512433.2016.1190271
• Tricco AC, Soobiah C, Blondal E, et al. Comparative efficacy of serotonin (5-HT3) receptor antagonists in patients undergoing surgery: a systematic review and network meta-analysis. BMC Med. 2015;13:136. Published 2015 Jun 18. doi:10.1186/s12916-015-0371-y
• Hesketh PJ, Kris MG, Basch E, et al. Antiemetics: ASCO Guideline Update. J Clin Oncol. 2020;38(24):2782-2797. doi:10.1200/JCO.20.01296
• Herrstedt J, Clark-Snow R, Ruhlmann CH, et al. 2023 MASCC and ESMO guideline update for the prevention of chemotherapy- and radiotherapy-induced nausea and vomiting. ESMO Open. 2024;9(2):102195. doi:10.1016/j.esmoop.2023.102195
• Rojas-Fernandez CH. Can 5-HT3 Antagonists Really Contribute to Serotonin Toxicity? A Call for Clarity and Pharmacological Law and Order. Drugs Real World Outcomes. 2014;1(1):3-5. doi:10.1007/s40801-014-0004-3
• Li WS, van der Velden JM, Ganesh V, et al. Prophylaxis of radiation-induced nausea and vomiting: a systematic review and meta-analysis of randomized controlled trials. Ann Palliat Med. 2017;6(2):104-117. doi:10.21037/apm.2016.12.01

In this episode, we review the newly published 2025 ACC/AHA hypertension guidelines.

Key Concepts

1. Instead of the Pooled Cohort Equations (PCE) from 2013, the 2025 hypertension guidelines recommend a new risk equation called PREVENT, which incorporates new risk factors and does not include race as part of the risk calculation.
2. The guidelines recommend starting two antihypertensive medications for initial therapy in stage II hypertension and one antihypertensive medication for stage I hypertension.
3. The guidelines no longer recommend specific first-line therapies for black patients. Instead, all patients without compelling indications should be initiated on a thiazide, ACE inhibitor, ARB, or dihydropyridine calcium channel blocker regardless of race/ethnicity.
4. All patients should have a blood pressure goal of < 130/80 mmHg. Some patients may consider a more stringent goal of < 120/80 if they have diabetes or are at a higher risk of future ASCVD events.

References

• Jones DW, Ferdinand KC, Taler SJ, Johnson HM, Shimbo D, Abdalla M, Altieri MM, Bansal N, Bello NA, Bress AP, Carter J, Cohen JB, Collins KJ, Commodore-Mensah Y, Davis LL, Egan B, Khan SS, Lloyd-Jones DM, Melnyk BM, Mistry EA, Ogunniyi MO, Schott SL, Smith SC Jr, Talbot AW, Vongpatanasin W, Watson KE, Whelton PK, Williamson JD. 2025 AHA/ACC/AANP/AAPA/ABC/ACCP/ACPM/AGS/AMA/ASPC/NMA/PCNA/SGIM Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines. Circulation. 2025 Aug 14. doi: 10.1161/CIR.0000000000001356. Epub ahead of print. PMID: 40811497.