A PATIENT WAS ON LITHIUM THERAPY FOR BIPOLAR DISORDER FOR 6MONTHS SHE KEPT THE FAST FOR FEW DAYS .SHE PRESENTED WITH S3 , COARSE TREMORS , CONFUSION AND WEAKNESS OF LIMBS. WHICH OF THE FOLLOWING SHOULD BE DONE NEXT TO ASSESS HER CONDITION ?: (A) S.ELECTROLYTES, (B) ECG, (C) MRI, (D) S.LITHIUM LEVELS
Answer is D. REF : KD TRIPATHI 8TH ED