Kinda scary

So, my mom and some other nurses were playing around with the EKG, and her heart was doing something funny, so she had a stress test done.  Her heart rate was good, but they said she had a leaky valve.  (She also told me she could make her rhthym change by coughing... not normal and probably not good).  She has to go back for more tests...  its kinda scary, but she doesn't seem too worried.