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Interpretation of the central aortic pressure waveform in elderly patients with aortic stenosis
Sara L Hungerford1,2,3, Audrey I Adji2, Navin K Kapur3
1Department of Cardiology, Royal North Shore Hospital, Sydney, New South Wales, Australia.
Insights
The central aortic pressure waveform changes significantly in elderly patients with aortic valve stenosis (AS). Understanding these waveform alterations is crucial for managing AS and related cardiovascular conditions.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Geriatric Medicine
Background:
- The central aortic pressure waveform's interpretation is complex, especially in aging populations.
- Aortic valve stenosis (AS) involves leaflet fibrosis and calcification, impeding blood flow.
- Age-related changes in arterial properties and pulse wave velocity (PWV) also alter the waveform.
Purpose of the Study:
- To review the evolving understanding of central aortic pressure waveforms in patients with AS.
- To highlight the physiological and biological basis for waveform alterations in AS.
- To emphasize the importance of waveform analysis in the context of new AS treatments.
Main Methods:
- Review of existing literature on central aortic pressure waveforms.
- Analysis of physiological mechanisms affecting waveform contour in AS.
- Discussion of clinical relevance in light of transcatheter aortic valve implantation (TAVI).
Main Results:
- AS causes a "pulsus parvus et tardus" (weak and slow pressure rise).
- Changes in arterial elasticity, geometry, and PWV contribute to waveform modifications.
- Increased accessibility of waveform measurement tools aids research.
Conclusions:
- Understanding central aortic pressure waveform perturbations in AS is vital.
- Physiological basis for waveform changes provides insights into AS pathophysiology.
- Waveform analysis is increasingly important with advancements in AS treatment like TAVI.
Abstract:
The central aortic pressure waveform, while simple in form, is complex in its physiological interpretation. Although general agreement has been reached on the contour and mechanisms responsible for pressure waveforms in the ascending aorta of healthy humans, in recent years there has been increasing interest in the contour of the pressure wave in elderly patients with aortic valve stenosis (AS). As aortic valve leaflets succumb to fibrosis and calcification, they increase opposition to forward flow. This results in a protracted pressure rise and manifests as the classical finding of pulsus parvus et tardus. Equally, changes to arterial properties (including elasticity and geometry) and pulse wave velocity (PWV) with age, heart failure, or hypertension can cause profound changes to the contour. Increased accessibility of methods to measure the central aortic pressure waveform, as well as the rapid uptake of transcatheter aortic valve implantation technologies, has created a renewed focus on better understanding of characteristic perturbations to the waveform in elderly patients with AS. In this review, we investigate the evolution of our understanding of the central aortic pressure waveform in varying AS disease states to highlight the importance of the physiological and biological basis for alterations in this waveform.
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