Figure 2From: Two-domain mechanics of a spherical, single chamber heart with applications to specific cardiac pathologies The geometry of the spherical heart. The spherical heart model will make use of spherical coordinates standard in physics, with the azimuthal angle off the x-axis. The radial symmetry of the problem presents a chamber of radius a maintained at a fluid pressure q 0, a muscle thickness (b – a) and an outer enclosing pericardial sac maintained at fluid pressure q 1.Back to article page