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Induction and Phenotyping of Acute Right Heart Failure in a Large Animal Model of Chronic Thromboembolic Pulmonary Hypertension
Published on: March 17, 2022
Acute hypertensive pulmonary edema: a new paradigm
1Krannert Institute of Cardiology, Indiana University School of Medicine, 1800 North Capitol Avenue, Indianapolis, IN 46202, USA. lieford@iupui.edu
Canadian Journal of Physiology and Pharmacology
|February 5, 2010
Summary
Acute hypertensive pulmonary edema may not be heart failure but a positive feedback loop. Increased sympathetic tone constricts veins, shifting blood to the pulmonary vasculature, causing rapid symptom onset and reversal.
Area of Science:
- Cardiology
- Pulmonary Medicine
- Physiology
Background:
- Acute hypertensive pulmonary edema is often misclassified as severe heart failure.
- The condition exhibits rapid onset and reversal, suggesting a dynamic, non-failing cardiac mechanism.
Purpose of the Study:
- To propose a novel positive feedback mechanism for acute hypertensive pulmonary edema.
- To re-evaluate the pathophysiology of this condition beyond traditional heart failure models.
Main Methods:
- Conceptual analysis of the syndrome's characteristics.
- Review of empirical treatments and their physiological effects.
- Hypothesizing a feedback loop involving sympathetic tone and vascular pressure.
Main Results:
- The heart functions above resting levels during peak symptoms, contradicting heart failure.
- A positive feedback loop is proposed: increased sympathetic tone constricts veins, redirecting blood to the pulmonary vasculature.
- Treatments aim to reduce pulmonary blood volume by shifting it to peripheral veins.
Conclusions:
- Acute hypertensive pulmonary edema is likely a distinct syndrome driven by a sympathetic-mediated positive feedback loop.
- This mechanism explains the rapid onset and resolution of symptoms.
- Understanding this feedback loop offers new perspectives on treatment strategies.
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