“Temporal Changes in Transvalvular Pressure Gradients in Balloon‐Expandable and Self‐Expanding Transcatheter Aortic Valves”

I read with great interest the article by Sedrakyan et al. [1] on temporal changes in transvalvular pressure gradients following transcatheter aortic valve replacement (TAVR). The authors provide valuable insight into early hemodynamic differences between balloon-expandable and self-expanding valves. However, I would like to highlight several considerations that may strengthen the interpretation and clinical applicability of their findings. First, while the study documents early differences in mean gradient behavior, it does not explore the mechanistic underpinnings of these changes. Prior work by Pibarot and Dumesnil has shown that prosthetic valve hemodynamics are strongly influenced by valve design, patient–prosthesis mismatch, and pressure recovery, underscoring the importance of mechanistic interpretation in addition to descriptive gradient reporting [2]. Second, although more women in the present study received self-expanding valves, the potential impact of sex-specific anatomy and physiology on hemodynamic outcomes was not addressed. Evidence from Chiam et al. demonstrates that women undergoing TAVR often present with smaller annuli and higher rates of vascular complications, yet paradoxically exhibit better survival compared to men [3]. This highlights the importance of considering sex differences when interpreting valve performance and gradient behavior. Third, while Sedrakyan et al. report significant early differences between balloon-expandable and self-expanding valves, these findings are not linked to patient-centered outcomes. Herrmann et al. emphasize that hemodynamic parameters such as gradients and effective orifice area only gain true clinical relevance when connected to survival, rehospitalization, or valve durability [4]. Without this linkage, the prognostic significance of the observed differences remains uncertain. Finally, the study is limited to 1–2 months of follow-up. Other evidence demonstrates that clinically meaningful valve deterioration emerges much later. In a systematic review of more than 10,000 patients, Long and Liu reported that structural valve deterioration increased from 4.9% at 1 year to nearly 9% at 5 years, with smaller prosthesis size and higher post-procedural gradients as strong predictors [5]. These findings highlight the necessity of extended follow-up to determine the true clinical significance of early gradient changes. In conclusion, while Sedrakyan et al. provide important observations on early post-TAVR hemodynamics, further studies incorporating mechanistic analyses, sex-specific considerations, long-term follow-up, and clinical outcome correlations are needed to fully understand the implications of gradient dynamics across valve platforms. The author declares no conflicts of interest.