An absolute indication for LSCS in case of a Heart disease is:
Co-arctation of Aorta
Eisenmenger syndrome
Ebsteins anomaly
Pulmonary stenosis
Heart disease during pregnancy, in itself is not an indication for cesarean section.
Cesarean section in heart disease is done in specific cases.

“In coarctation of aorta, elective cesarean section is indicated to prevent rupture of the aorta or mycotic cerebral aneurysm.”

Dutta Obs. 7/e, p 278