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Rapidly developing tolerance to transdermal nitroglycerin in congestive heart failure
Annals of Internal Medicine
|March 1, 1986
Summary
This study found that while transdermal nitroglycerin initially lowers pulmonary wedge pressure in heart failure patients, tolerance develops rapidly. This leads to a loss of hemodynamic benefits despite sustained high nitroglycerin plasma levels.
Area of Science:
- Cardiology
- Pharmacology
- Clinical Medicine
Background:
- Early studies reported diminished hemodynamic effects of transdermal nitroglycerin in heart failure.
- This study investigates nitroglycerin plasma levels in relation to these hemodynamic changes.
Purpose of the Study:
- To determine nitroglycerin plasma levels during transdermal administration in heart failure patients.
- To correlate these levels with hemodynamic responses, specifically pulmonary wedge pressure.
- To elucidate the mechanism behind the early attenuation of nitroglycerin's effects.
Main Methods:
- A double-blind study administering transdermal nitroglycerin (60 mg/24 h) or placebo to heart failure patients.
- Monitoring of pulmonary wedge pressure and plasma nitroglycerin levels over 24 hours.
- Comparison of hemodynamic and plasma level data between nitroglycerin and placebo groups.
Main Results:
- Transdermal nitroglycerin administration led to a rapid increase in plasma nitroglycerin levels within 2 hours.
- Pulmonary wedge pressure significantly decreased, reaching a nadir at 4 hours post-administration.
- Despite sustained high plasma nitroglycerin levels, the reduction in pulmonary wedge pressure was no longer significant by 18 hours.
Conclusions:
- Rapid tolerance development is the primary reason for the early loss of hemodynamic efficacy of transdermal nitroglycerin.
- The findings highlight the transient nature of nitroglycerin's benefits in heart failure under these conditions.
- Further research may be needed to optimize nitroglycerin therapy or explore alternative treatments for heart failure.
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