Heart failure & cardiomyopathies
Assessing Cardiomyocyte DNA Damage Using Cardiovascular Magnetic Resonance T1 Mapping: Insights From Comparative Biopsy Analysis
Authors' conclusion
Native T1 mapping effectively detects DNA damage and fibrosis, revealing different pathophysiological mechanisms behind the increased native T1 and ECV. A disproportionate increase in native T1 relative to ECV suggests early myocardial injury preceding fibrosis in DCM, with potential implications for myocardial tissue recovery after guideline-directed therapy.
Study context
- Population
- Recent-onset dilated cardiomyopathy (DCM) patients undergoing endomyocardial biopsy and serial 3T cardiovascular magnetic resonance before and after guideline-directed therapy
- Participants
- 36 recent-onset DCM patients
- Comparison
- T1 mapping (native T1, extracellular volume (ECV)) vs histological cardiomyocyte DNA damage (poly(ADP-ribose) quantification) and collagen volume fraction (CVF) in biopsy specimens
- Outcome
- Correlation of native T1 and ECV with histological CVF
Methodological detailsendomyocardial biopsy, serial 3T cardiovascular magnetic resonance before and after guideline-directed therapy
- Endomyocardial biopsy
- Serial 3T cardiovascular magnetic resonance before and after guideline-directed therapy
Recommendations
As reported in the abstract
Native T1 vs CVF, r
r = 0.62
ECV vs CVF, r
r = 0.67
P
P < 0.001
Further findings
Correlation of native T1 with severity of cardiomyocyte DNA damage
- Native T1 vs DNA damage, r
- r = 0.41
- P
- P = 0.01
- ECV did not correlate with DNA damage
- Association remained significant after controlling for CVF
Native T1 for an equivalent ECV in patients with substantial DNA damage
- Significantly higher native T1 with substantial DNA damage
- P = 0.004
Myocardial tissue recovery following guideline-directed therapy (in the absence of severe fibrosis)
- Association with baseline DNA damage
- r = −0.49, P = 0.004
- Association with CVF
- r = −0.17, P = 0.38
- In the absence of severe fibrosis
Original publication
Summarised from the published abstract; every number is checked against it