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Cells of the adult human heart · Nature (2020)
3. Findings & Supporting Evidence
The adult human heart contains at least 11 major cell types with distinct distributions across chambers and with extensive further heterogeneity within each type, particularly among cardiomyocytes, fibroblasts, and immune cells, revealing new cell populations and cell–cell interactions that were previously unknown.
Five ventricular cardiomyocyte subtypes identified
Evidence (p. 2): “We identify five ventricular cardiomyocyte (vCM1–vCM5) populations: vCM1 comprise 63.9% of left ventricular cardiomyocytes but only 36.7% of right ventricular cardiomyocytes”
+ 3 more findings, each cited to a page
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Reverse Remodeling With Left Ventricular Assist Devices
Circulation Research (2021)
3. Findings & Supporting Evidence
LVAD support induces significant reverse remodeling at structural, cellular, and molecular levels, but the vast majority of hearts do not achieve full normalization, and true recovery remains rare (explant rate <5%). The incomplete reversal of the HF transcriptional program and persistent fibrosis are major impediments.
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Only a small fraction of HF-dysregulated genes normalize with LVAD — Margulies et al. found 238 of 3088 dysregulated transcripts changed significantly after LVAD; many deviate further from normal.
Evidence (p. 10): “of 3088 transcripts dysregulated in heart failure, only 238 exhibited a statistically significant change in expression levels after LVAD support.”
Clinical recovery is rare (<5% explant rate) — Registry studies show low explant rates; partial recovery (LVEF >40%) in about 9% of patients.
Evidence (p. 13): “the overall rate of recovery sufficient for device explantation is <5%, an additional 9% of LVAD population exhibits significant improvement in LV function (defined as LVEF >40%)”
+ 7 more findings, each cited to a page
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