Wife has pacemaker/defibrillator she's at 10% ef. they said she had about 6 months, she was in icu with influenza a she was 25% could her ef be off.

Many reasons.: The ejection fraction (EF) as measured by echocardiograms, MUGA scans, cardiac MRI, etc. is a variable - it can fluctuate depending on the body's condition & depending on errors in measurement (of MRI, ultrasound, etc). It can be suppressed (low) if there is volume overload (too much body water) or in an active infection. Good treatment, over time, can improve the EF. TTY Cardiologist. Good luck!