<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello Doctor,I am regularly awakened from sleep due to palpitations and numbness in my arms and fingers. The irregular and fast heart beats take some 5-10 mins. to slow down to a comfortable level. I have Mitral Valve Prolapse Gr. I. Please help.  <response>: Hello! Your symptoms could be related to a cardiac arrhythmia. Another possible cause to consider would be a pinched nerve or neuropathy, which could cause numbness in the arms and fingers. For this reason, I would recommend consulting with your attending physician for a careful physical exam and some tests: -an ambulatory 24-48 hours ECG monitoring in order to examine your heart rhythm for a prolonged time-complete blood count for anemia-thyroid hormone levels for thyroid dysfunction- blood electrolytes for possible imbalance- a cervical spine X-ray study to examine your cervical vertebral column for possible degeneration- a nerve conduction study to examine your nerves in your upper limbs. You should discuss with your doctor on the above tests. Wishing good health, 