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The push, the pull and the periphery
1Department of Medicine (Clinical Cardiology), Hammersmith Hospital, London, UK.
Insights
Improving heart function requires effective treatments. Angiotensin converting enzyme inhibitors (ACEI) reduce mortality and improve survival in heart failure patients, though challenges with exercise tolerance and fatigue persist.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Current heart failure treatments have limitations.
- Inotropes are only for short-term use, and digitalis has feeble effects.
- Phosphodiesterase inhibitors may increase sudden death mortality.
Purpose of the Study:
- To evaluate the role of angiotensin converting enzyme inhibitors (ACEI) in heart failure treatment.
- To assess the impact of ACEI on mortality, ventricular ectopy, and sudden death.
- To explore the limitations of existing heart failure therapies.
Main Methods:
- Review of clinical trial data, including CONSENSUS, V-HeFT-2, and SOLVD.
- Analysis of the effects of diuretics, nitrates, and ACEI on heart function and patient outcomes.
Main Results:
- ACEI are the cornerstone of heart failure treatment, reducing mortality and improving survival.
- ACEI may reduce ventricular ectopy by improving left ventricular function.
- Despite reducing overall mortality, ACEI did not diminish sudden death incidence in the SOLVD trial.
Conclusions:
- ACEI significantly improve outcomes in heart failure patients.
- Further research is needed to address persistent symptoms like fatigue and improve exercise tolerance.
- The search for effective chronic oral inotropes remains a critical unmet need in heart failure management.
Abstract:
If the failing left ventricle could be given an effective push, other approaches to the treatment of heart failure would not be needed. We have inotropes only for short-term parenteral use. We have no safe inotrope for chronic oral use. The effect of digitalis is only feeble and the phosphodiesterase inhibitors seem to increase mortality from sudden death. Diuretics are dramatic for acute pulmonary oedema and the mainstay for chronic fluid retention but do not improve the pump and by reducing blood volume stimulate the renin angiotensin system to vasoconstriction, further fluid retention and hypokalaemia. Nitrates drop pre-load without reducing blood volume but tolerance is a problem and stroke volume does not increase. Reduction of afterload helps the failing ventricle to empty, the pull and output increases. The angiotensin converting enzyme inhibitors (ACEI) are now the cornerstone of heart failure treatment, reducing mortality in severe heart failure (CONSENSUS) and superior to standard vasodilator therapy (V-HeFT-2) at improving the survival of patients with mild to moderate heart failure. ACEI can reduce the incidence of ventricular ectopy and probably do this through improving left ventricular function, from decreasing sympathetic tone, reducing myocardial oxygen demand or increasing serum potassium but ACEI did not diminish the incidence of sudden death in the SOLVD trial despite reducing mortality. Disappointingly little improvement in exercise tolerance and persistence of chronic fatigue in heart failure concentrated attention on the periphery.(ABSTRACT TRUNCATED AT 250 WORDS)
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