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Hyponatremia, Heart Failure, and the role of Tolvaptan (Samsca)

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Presentation on theme: "Hyponatremia, Heart Failure, and the role of Tolvaptan (Samsca)"— Presentation transcript:

1 Hyponatremia, Heart Failure, and the role of Tolvaptan (Samsca)

2  Authors: John B. O’Connell, MD and Addis Alemayehu, PharmD  Funding: Heart Failure Consultants, Sunset, SC and Otsuka America Pharmaceutical, Inc., Rockville, MD  Journal: Postgraduate Medicine

3  Otsuka funded this study and is the manufacturer of Tolvaptan  Otsuka manufactures Tolvaptan and there is currently only one other drug in its class: Conivaptan (Vaprisol)  Both drugs are Vasopressin (ADH) receptor antagonists causing the excretion of free H20

4  Tolvaptan is a selective V 2 -receptor antagonist  Conivaptan is a dual V 1A /V 2 -receptor antagonist  This study suggests that Tolvaptan has a 1.8-times greater affinity for the V 2 - receptor than Arginine Vasopressin (AVP)

5  Hyponatremia is characterized by serum Na levels of less than 135 mEq/L  Na is freely filterable at the glomerulus  H20 reabsorption is independent of ADH until it reaches the collecting duct system  Hyponatremia is a common finding in heart failure (HF) patients

6  Does Tolvaptan increase serum Na in patients with hyper/euvolemic hyponatremia, especially HF patients?  Is it safe to use, are there any adverse affects of Tolvaptan usage?

7  ACTIV trial in CHF  Early randomized phase 2 trial  VICTOR trial  Randomized, controlled phase 2 trial  NYHA Class II-III HF with LVEF ≤ 40% and signs of congestion such as rales and edema

8  SALT-1 and SALT-2 trials  Hospitalized patients only  Randomized, controlled, double-blinded placebo phase 3 study  All patients had hyper/euvolemic hyponatremia (N=448)  31% of patients had HF  The remainder suffered from SIADH or cirrhosis of the liver as an underlying cause

9  EVEREST Study: Efficacy of Vasopressin Antagonism in HF Outcome Study with Tolvaptan  Phase 3 randomized, controlled, double- blinded placebo study  4133 hospitalized patients with HF  Must be allocated and selected for study within 48hrs of admission  Did not specify NYHA classification

10  This presentation will focus on the SALT- 1, SALT-2 and EVEREST trials  There was no information in the article specifying age, race, socioeconomic statistics

11  SALT-1, SALT-2 and EVEREST studies were only conducted on inpatients  SALT-1 and SALT-2 patient populations must have met the criteria for NYHA Class II-III HF

12  Patients were randomized to Tolvaptan or placebo for 30 days  Starting dose was 15mg daily with a F/U assessment in 7 days  During the first four days, Tolvaptan was titrated up to 60mg daily in order to achieve serum Na level ≥ 135mEq/L  Most patients were discharged on day four, but a 30 day F/U was conducted

13  Patients received Tolvaptan 30mg or placebo within 48hrs of admission  Additional HF medications were administered at the discretion of the physician  Patients received Tolvaptan for a minimum of 60 days

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15  There was a significant decrease in both body weight and patient-assessed dyspnea (P<0.001 for both statistics)  Decreased body weight was associated with corresponding decreased in symptoms (dyspnea)  This suggests Tolvaptan helped reduce pulmonary congestion by correcting hyponatremia

16  Suggest that Tolvaptan was superior to placebo in safely correcting hyponatremia in patients with presenting Na levels of < 130 mEq/L and < 125 mEq  After 7 days of discontinuation of Tolvaptan, Na levels returned to baseline levels of hyponatremia similar to those on placebo

17  Treatment with Tolvaptan was superior to fluid restriction

18  Tolvaptan reduced physician-assessed signs of HF such as orthopnea, dyspnea and the presence of rales on physical exam  A lower mean dose of furosemide was needed to treat these patients  This suggests that Tolvaptan may reduce the need of loop diuretics when diuresing HF patients

19  In the SALT-1, SALT-2 and EVEREST studies, treatment with Tolvaptan was superior to both placebo and fluid restriction in concert or used singularly

20  Although it is extremely difficult financially to conduct third party studies of most drugs, especially “boutique” drugs like Tolvaptan and Conivaptan, results from studies funded by the manufacturing pharmaceutical company should be interpreted with a grain of Na (pun intended)

21  Tolvaptan is extremely expensive, but may be a necessary treatment for hyponatremia that is refractory to fluid restriction and other measures in HF patients.  One 15mg pill is $300  A one month supply is $3000-$10k  It is not covered by Medicare  I would give the studies a Class 1b rating on statistical significance

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