Left ventricular volume reduction: new dawn or false horizon? Basic science and clinical doubts

Area of Science:

• Cardiology
• Cardiac Surgery
• Cellular Physiology

Background:

• Left ventricular volume reduction surgery (LVVR) is a selective treatment for end-stage dilated cardiomyopathy with uncertain long-term efficacy.
• A growing body of literature necessitates data pooling through international registries for robust analysis.
• Identifying patient subgroups who benefit most from LVVR is crucial.

Purpose of the Study:

• To explore the potential of basic science, specifically cellular-level analysis, to improve patient selection for LVVR.
• To investigate the physiological characteristics of myocytes from patients with idiopathic dilated cardiomyopathy undergoing LVVR.

Main Methods:

• Intraoperative myocardial biopsies were obtained from patients with idiopathic dilated cardiomyopathy.
• Myocytes were isolated from biopsy samples to assess cellular-level physiological characteristics.
• Contractile function in response to electrical stimulation and calcium transients were measured.

Main Results:

• Myocytes exhibited varying degrees of contractile anomalies when electrically stimulated.
• Defective calcium handling was identified, as indicated by altered calcium transient measurements.
• These cellular findings suggest potential for improved patient stratification.

Conclusions:

• Cellular-level analysis of myocardial biopsies can reveal physiological characteristics relevant to LVVR outcomes.
• Investigating myocyte function, particularly calcium handling, may help identify patients most likely to benefit from LVVR.
• Extending this approach to preoperative biopsies could enhance patient selection and reduce surgical failures.