has no relation with cardiac disease.Laryngitis is inflammation and infection of Larynx
.Its just a coincidence that your mother had laryngitis prior to her bypass.But this time the Laryngitis-the infection might have indirectly caused the stress
on heart.Any condition like anemia
etc can cause stress to a heart patient and increase chances of ischemia
in vulnerable individuals.You need not worry about all this,just visit your Cardiologist and he will advise you clearly what to be done in your Mother's case.I hope this information is useful to you.I wish your mother good health and wish you all the best.