Elevated International Normalized Ratio in a Patient Taking Warfarin and Mauby: A Case Report.

We describe a 70-year-old Haitian man who had been taking warfarin for 5 years for atrial fibrillation and pulmonary hypertension. This patient had his international normalized ratio (INR) checked in the pharmacist-run anticoagulation clinic and was followed monthly. Prior to the interaction, his INR was therapeutic for 5 months while taking warfarin 10.5 mg/d. The patient presented with an INR > 8.0. Patient held 4 days of warfarin and restarted on warfarin 8.5 mg/d. Two weeks later, his INR was 2.5. After continuing dose, patient presented 2 weeks later and INR was 4.8. Upon further questioning, the patient stated he recently began ingesting mauby. Mauby is a bitter dark liquid extracted from the bark of the mauby tree that is commonly used in the Caribbean population as a folk remedy with many health benefits. This case report illustrates that mauby may have a probable drug-herb interaction (Naranjo Algorithm Score of 6) when given with warfarin. There is a lack of published literature and unclear information on the Internet describing the interaction of mauby and warfarin. Health professionals should be cautious regarding interactions between warfarin and mauby until the interaction is fully elucidated.

Readministration of drotrecogin alfa (activated) in an adult with severe sepsis.

PURPOSE: The case of a patient with severe, multidrug-resistant, postoperative sepsis who was successfully treated with drotrecogin alfa (activated) on two occasions is reported. SUMMARY: After a thigh debridement procedure, a 55-year-old African-American woman developed systemic inflammatory response syndrome (SIRS) secondary to necrotizing fasciitis. Despite empiric treatment including piperacillin-tazobactam and vancomycin, the patient remained severely hemodynamically unstable, exhibiting signs of multiorgan failure and requiring mechanical ventilation and the placement of a tracheostomy tube. After the administration of i.v. drotrecogin alfa (activated) 160 mg (24 µg/kg/hr) over 96 hours in combination with standard i.v. antimicrobials and vasopressin, the patient's hemodynamic status improved considerably. About three weeks later, the patient again developed SIRS that was refractory to standard therapies. After the results of laboratory cultures indicated ventilator-associated pneumonia due to multidrug-resistant Klebsiella pneumoniae, the woman received a second course of drotrecogin alfa and other therapies. Her condition improved and she was extubated and eventually transferred to a medical-surgical unit for continued care. While drotrecogin alfa, a recombinant form of human activated protein C (APC), has been shown to reduce mortality in adults with severe sepsis and acute organ dysfunction, previous reports indicated an increased risk of thrombotic events with the use of the drug, and there is speculation that the development of anti-APC antibodies might result in a diminished therapeutic response. In the case described here, there were no thrombotic events during or after either drotrecogin alfa infusion and no clinical evidence of antibody formation. CONCLUSION: A patient received two complete courses of drotrecogin alfa (activated) without any treatment-related complications.

Rhabdomyolysis caused by a potential sitagliptin-lovastatin interaction.

A 75-year-old woman with diabetes mellitus, hypertension, and hyperlipidemia came to the emergency department with generalized and upper-extremity weakness; she had experienced a fall 2 months earlier. On admission, her drug therapy included lovastatin 40 mg/day, controlled-release diltiazem 240 mg/day, and glimepiride 1 mg/day. Nineteen days earlier, sitagliptin 100 mg/day had been started; it was discontinued 2 weeks later, and glimepiride was begun. A cardiology consultation performed on the day of admission determined that a markedly elevated creatine kinase-myocardial band isoenzyme level and borderline-high troponin I level were diagnostic of rhabdomyolysis secondary to statin use. Because the patient had been taking lovastatin for the past 12 years, the possibility that the rhabdomyolysis may have been caused by a drug interaction between lovastatin and a concomitant drug was evaluated. As it had been 10 months since her last dosage adjustment of diltiazem, it was unlikely that the statin-induced rhabdomyolysis was precipitated by diltiazem. Use of the Drug Interaction Probability Scale to determine the strength of a lovastatin-sitagliptin interaction indicated a possible association (score of 4). Multiple drug interactions have been reported with lovastatin. To our knowledge, however, this is the first case report of a possible sitagliptin-lovastatin interaction that may have caused rhabdomyolysis. Studies must be performed to further evaluate the in vivo effect of sitagliptin on the cytochrome P450 3A4 enzyme system and to elucidate other mechanisms that may potentiate such a drug-drug interaction. In the meantime, however, clinicians should be aware of this possible drug interaction.

A randomized clinical trial of nebulized magnesium sulfate in addition to albuterol in the treatment of acute mild-to-moderate asthma exacerbations in adults.

STUDY OBJECTIVE: We sought to compare the efficacy and safety of nebulized magnesium sulfate (MgSO(4)) plus albuterol with that of albuterol alone in adult patients with mild-to-moderate acute asthma exacerbations. METHODS: Patients were randomized to receive nebulized MgSO(4) (384 mg in 6 mL of sterile water) or an equal volume of placebo (normal saline solution) in a double-blind fashion after each dose of nebulized albuterol administered (2.5 mg/3 mL) every 20 minutes for the first hour of the study. Spirometry was performed at baseline and every 20 minutes for 2 hours. Monitoring for safety included vital signs, pulse oximetry, and serum magnesium levels. Improvement in percent predicted forced expiratory volume in 1 second was chosen as a primary efficacy end point. RESULTS: Among 74 patients enrolled, 37 were randomized to each of 2 study groups. There were no statistically or clinically significant differences between the 2 study groups in percent predicted forced expiratory volume in 1 second at any point during the trial or overall. There were no significant differences in vital signs, pulse oximetry, or serum magnesium levels at any point during the study. CONCLUSION: The combination of nebulized MgSO(4) and albuterol provides no benefit in addition to that provided by therapy with albuterol in adult patients with mild-to-moderate asthma exacerbations. The efficacy of nebulized MgSO(4) in patients with severe asthma exacerbations remains unknown.