Acute elevation of liver function test values following concomitant administration of dabigatran and primidone

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PURPOSE

We report a unique case of transiently elevated liver function test (LFT) values associated with concurrent use of dabigatran and primidone, which has not previously been described in the scientific literature.

SUMMARY

Management of drug-drug interactions requires a fundamental understanding of pharmacodynamic and pharmacokinetic parameters. Despite the use of available best predictive models, idiosyncratic drug reactions may still occur when a newly approved medication begins to be used in the general population. We report a case of a possible interaction (Naranjo adverse drug reaction probability score of 3, Roussel Uclaf causality assessment method score of 3) between dabigatran and primidone in a 70-year-old Caucasian male resulting in a transient elevation of LFT values. The patient was transitioned from warfarin to dabigatran in the setting of persistently subtherapeutic international normalized ratio values. During a routine outpatient follow-up appointment approximately 1 month after dabigatran initiation, the patient was discovered to have LFT values greater than 5 times the upper limit of normal. Dabigatran was thus discontinued; the patient was returned to warfarin therapy and their LFT values returned to baseline.

CONCLUSION

Studies have indicated a potential for reduced dabigatran efficacy with primidone due to P-glycoprotein induction, thereby potentiating the risk for thrombosis. To date, reports are lacking of this interaction resulting in hepatic injury. The present case suggests that this interaction may be clinically significant with regard to selection of antithrombotic medication therapy in patients on primidone therapy.

New Injectable Agents for the Treatment of Type 2 Diabetes Part 2-Glucagon-Like Peptide-1 (GLP-1) Agonists

The US Food and Drug Administration has recently approved several new glucagon-like peptide-1 (GLP-1) agonists alone and in combination with various insulin products. The second of 2 articles in a series, this review will describe the potential advantages and disadvantages of the GLP-1 agonist class of products.

New Injectable Agents for the Treatment of Type 2 Diabetes Part 1 - Injectable Insulins

The United States Food and Drug Administration has recently approved several new insulin products and new formulations of existing insulin products. These new products may provide advantages over older products, such as a lower risk of nocturnal hypoglycemia and ease of dosing; however, they are costly. The first of 2 articles in a series, this review will describe the potential advantages and disadvantages of these new insulin products.

Type 2 Diabetes Mellitus: Outpatient Insulin Management

In patients with type 2 diabetes mellitus, insulin may be used to augment therapy with oral glycemic medications or as insulin replacement therapy. The American Diabetes Association suggests the use of long-acting (basal) insulin to augment therapy with one or two oral agents or one oral agent plus a glucagon-like peptide 1 receptor agonist when the A1C level is 9% or more, especially if the patient has symptoms of hyperglycemia or catabolism. Insulin regimens should be adjusted every three or four days until targets of self-monitored blood glucose levels are reached. A fasting and premeal blood glucose goal of 80 to 130 mg per dL and a two-hour postprandial goal of less than 180 mg per dL are recommended. Insulin use is associated with hypoglycemia and weight gain. Insulin analogues are as effective as human insulin at lowering A1C levels with lower risk of hypoglycemia, but they have significantly higher cost. Patients with one or more episodes of severe hypoglycemia (i.e., requiring assistance from others for treatment) may benefit from a short-term relaxation of glycemic targets. Several new insulin formulations have been approved recently that are associated with less risk of hypoglycemia compared with older formulations. The goals of therapy should be individualized based on many factors, including age, life expectancy, comorbid conditions, duration of diabetes, risk of hypoglycemia, cost, patient motivation, and quality of life.

Effect of diseases on response to vitamin K antagonists

INTRODUCTION

The purpose of this review article is to summarize the literature on diseases that are documented to have an effect on response to warfarin and other VKAs.

METHODS

We searched the English literature from 1946 to September 2015 via PubMed, EMBASE, and Scopus for the effect of diseases on response vitamin K antagonists including warfarin, acenocoumarol, phenprocoumon, and fluindione.

DISCUSSION

Among many factors modifying response to VKAs, several disease states are clinically relevant. Liver disease, hyperthyroidism, and CKD are well documented to increase response to VKAs. Decompensated heart failure, fever, and diarrhea may also elevate response to VKAs, but more study is needed. Hypothyroidism is associated with decreased effect of VKAs, and obese patients will likely require higher initial doses of VKAs.

CONCLUSION

In order to minimize risks with VKAs while ensuring efficacy, clinicians must be aware of the effect of disease states when prescribing these oral anticoagulants.

Management of Blood Glucose with Noninsulin Therapies in Type 2 Diabetes

A comprehensive, collaborative approach is necessary for optimal treatment of patients with type 2 diabetes mellitus. Treatment guidelines focus on nutrition, exercise, and pharmacologic therapies to prevent and manage complications. Patients with prediabetes or new-onset diabetes should receive individualized medical nutrition therapy, preferably from a registered dietitian, as needed to achieve treatment goals. Patients should be treated initially with metformin because it is the only medication shown in randomized controlled trials to reduce mortality and complications. Additional medications such as sulfonylureas, dipeptidyl-peptidase-4 inhibitors, thiazolidinediones, and glucagon-like peptide-1 receptor agonists should be added as needed in a patient-centered fashion. However, there is no evidence that any of these medications reduce the risk of diabetes-related complications, cardiovascular mortality, or all-cause mortality. There is insufficient evidence on which combination of hypoglycemic agents best improves health outcomes before escalating to insulin therapy. The American Diabetes Association recommends an A1C goal of less than 7% for many nonpregnant adults, with the option of a less stringent goal of less than 8% for patients with short life expectancy, cardiovascular risk factors, or long-standing diabetes. Randomized trials in middle-aged patients with cardiovascular risk factors have shown no mortality benefit and in some cases increased mortality with more stringent A1C targets.

Pharmacist-physician collaboration for diabetes care: cardiovascular outcomes

BACKGROUND

Only 23% of patients are meeting all goals for cardiovascular complications of diabetes.

OBJECTIVE

The purpose of our study is to evaluate the effect of a pharmacist-physician collaboration on attainment of cardiovascular-related goals in patients with type 2 diabetes.

METHODS

This prospective, multicenter cohort enrolled patients from 7 practice sites that were members of the University of Tennessee Pharmacist Practice Based Research Network (UT Pharm Net). Patients were included if they were diagnosed with type 2 diabetes, at least 18 years of age and English speaking. Pregnant patients were excluded. Patients were followed for 12 months after enrollment. Primary cardiovascular outcomes included reduction in systolic blood pressure, diastolic blood pressure, and low-density lipoprotein (LDL) as well as the proportion of patients achieving a blood pressure goal of <130/80 mm Hg and proportion of patients achieving an LDL goal of <100 mg/dL.

RESULTS

For the 206 patients enrolled, the average age was 59.7 years; the majority were male (59.7%) and white (66%). When compared with baseline, the postintervention mean systolic (P < .0001), diastolic blood pressure (P = .0003), and LDL (P < .0001) decreased significantly. The proportion of patients achieving a blood pressure of <130/80 mm Hg increased 21.8% (P < .0001), and the proportion of patients achieving an LDL of <100 mg/dL increased 12% (P = .0023).

CONCLUSIONS

The results of our study indicate that collaborative management has a positive impact on decreasing cardiovascular risk and assists patients in attaining national goals for blood pressure and cholesterol.

Elevated tobramycin concentrations following endotracheal administration in a premature infant

The following case report describes a 1-month-old, 34-week-gestation premature neonate who had compromised renal function. The neonate received endotracheally administered tobramycin (300 mg every 12 hours) via a PARI PLUS reusable nebulizer to treat a documented Gram-negative tracheostomy infection. The patient also received systemic tobramycin (2.5 mg/kg intravenously every 18 hours). The tobramycin serum concentration obtained 45 hours after the last intravenous dose and 11.5 hours after the second nebulized dose was 17.6 mg/L. The tobramycin nebulizations were stopped.

Comparing team-based and mixed active-learning methods in an ambulatory care elective course

OBJECTIVES

To assess students' performance and perceptions of team-based and mixed active-learning methods in 2 ambulatory care elective courses, and to describe faculty members' perceptions of team-based learning.

METHODS

Using the 2 teaching methods, students' grades were compared. Students' perceptions were assessed through 2 anonymous course evaluation instruments. Faculty members who taught courses using the team-based learning method were surveyed regarding their impressions of team-based learning.

RESULTS

The ambulatory care course was offered to 64 students using team-based learning (n = 37) and mixed active learning (n = 27) formats. The mean quality points earned were 3.7 (team-based learning) and 3.3 (mixed active learning), p < 0.001. Course evaluations for both courses were favorable. All faculty members who used the team-based learning method reported that they would consider using team-based learning in another course.

CONCLUSIONS

Students were satisfied with both teaching methods; however, student grades were significantly higher in the team-based learning course. Faculty members recognized team-based learning as an effective teaching strategy for small-group active learning.

Pharmacist-Managed Direct Thrombin Inhibitor Protocol Improves Care of Patients with Heparin-Induced Thrombocytopenia

Use of direct-thrombin inhibitors (DTIs) for the management of patients with heparin-induced thrombocytopenia (HIT) is challenging. A pharmacist-managed DTI protocol was implemented to standardize and improve the care of patients with HIT. A background study that compared DTI protocol–treated patients to those who did not receive treatment with the DTI protocol found that significantly more of the DTI protocol–treated patients received care that was consistent with level 1 guidelines from the American College of Chest Physicians (41% vs 0%). Because outcomes were poor regardless of whether the DTI protocol was used, the protocol was revised to require pharmacist implementation and oversight. A follow-up study compared DTI protocol patients from the background study (non-pharmacist-managed) to the pharmacist-managed DTI protocol group. There were significantly fewer dosing errors, improved nursing documentation, and less reexposure to heparin when the pharmacist was responsible for managing the DTI protocol. A trend toward reduced bleeding was noted. The management of patients with HIT is complex, and there are a number of pitfalls that may lead to poor outcomes. DTIs are high-risk medications that require careful dosing and monitoring to minimize risk for adverse drug events. A DTI protocol may improve care of patients with HIT, and pharmacist oversight of DTI use can help to reduce risk for errors and adverse medication events.