When trying to discern the exact particulars of a patient's medical history or preexisting conditions, it's very important to be able to read the patient's chart.
In the case that chart is in a language you don't speak, you need to seek out the professional assistance of a medical documentation translation professional.
You would best off if you found someone with extensive experience in translation along with a solid background in medicine.
A prime candidate would be a medical doctor with translation experience.
By using a professional you can rest assured that there will be no life endangering mistakes due to the misinterpretation of medical data from a foreign tongue.