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Anatomy and morphometry of myocardial capillaries studied with vascular corrosion casting and scanning electron
Insights
This study details a new method for creating detailed vascular corrosion casts of rat heart microvasculature. These casts aid in studying heart conditions and potential treatments.
Area of Science:
- Cardiovascular Research
- Microvascular Anatomy
- Scanning Electron Microscopy
Background:
- Understanding the intricate microvasculature of the heart is crucial for diagnosing and treating cardiovascular diseases.
- Previous methods for visualizing myocardial microvasculature have limitations in detail and completeness.
Purpose of the Study:
- To establish a reliable procedure for preparing vascular corrosion casts of rat myocardial microvasculature.
- To analyze the structural characteristics of the myocardial microvasculature using scanning electron microscopy.
Main Methods:
- A novel protocol involving in vitro heart clearing, KCl-induced cardiac arrest, and retrograde Mercox-Sevriton resin infusion.
- Potassium hydroxide (KOH) digestion of ventricular tissue followed by cast desiccation and SEM preparation.
- Optimization yielded complete casts in approximately 50% of rat subjects.
Main Results:
- Vascular corrosion casts revealed vasculature closely paralleling myocardial muscle fiber orientation.
- Capillary beds displayed characteristic branching patterns, numerous intercapillary cross-bridges, and occasional coiling.
- Average capillary cast diameter was 5.6 microns, with an intercapillary distance of 15 microns, consistent with in vivo findings.
- Preliminary analysis estimated vascular volume at approximately 10% of ventricular wall volume.
Conclusions:
- Vascular corrosion casting provides a valuable technique for detailed analysis of myocardial microvasculature.
- This method holds promise for investigating pathological conditions affecting the heart.
- The technique can aid in evaluating the efficacy of therapeutic interventions for cardiovascular diseases.
Abstract:
The present paper describes a procedure for preparing vascular corrosion casts of rat myocardial microvasculature. Essential components of the procedure include: partial "self clearing" of the heart in vitro; cardiac arrest by infusion of KCl; retrograde aortic root infusion of Mercox-Sevriton casting resin; KOH digestion of ventricular tissue; and desiccation and mounting of casts for scanning electron microscopy. About 50% of rats yielded complete casts. Vasculature closely paralleled muscle fiber orientation. Capillary beds characteristically exhibited branching, many intercapillary cross bridges, and occasional coiling. Average capillary cast diameter (5.6 microns) and intercapillary distance (15 microns) are comparable to results from in vivo studies. From preliminary calculations, vascular volume represents about 10% of the ventricular walls. These data indicate that vascular corrosion casts may be useful in the analysis of pathologic states and in determining the role of potential therapeutic interventions.