An 88-year-old women sought medical care (12/29/03) complaining about a 4-hour duration epigastric pain, followed by vomiting.The patient had knowledge of her longstanding hypertension, having undergone a cerebrovascular accident two years earlier, without motive sequels. Three months before, dyspnea due to moderate exercise and lower limb edema took place. She denied syncope.Physical assessment (10/03/03) showed 68-bpm heart rate and blood pressure of 180/80 mmHg. Lung examination did not show any problems, as well as abdomen exam. However, heart examination exhibited normophonetic sounds and mild systolic murmur in the mitral area. A ++/4 edema was identified in the lower limbs.The patient made daily use of losartan 50 mg, hydrochlorothiazide 50 mg, and acetylsalicylic acid 100 mg.EKG (09/30/03) displayed atrioventricular dissociation with junctional rhythm, 50-bpm heart rate, 80 msec QRS, with front plan low voltage (figure 1).Hemoglobin 15 g/dl, hematocrit 45%, potassium of 5.8 mEq/l (hemolized blood) and 138 mEq/l sodium were detected at laboratorial examinations.Sinus node disease diagnosis was achieved, followed by laboratorial assessment, including ambulatory electrocardiographic monitoring.Holter 24-hour ambulatory electrocardiographic monitoring (11/18/03) showed prevailing sinus rhythm, 3 ventricular extrasystoles under ventricular tachycardia and a single ventricular extra-systole. Frequent atrial extra-systoles (645/h) took place, from which 570 were isolated, 36 matched, and a 3-heartbeat atrial tachycardia episode. Several under care 4.3-sec sinus pauses, between 8 pm and 9 pm, were detected (figures 2 and 3).Evolution demonstrated (12/29/03) 4-hour epigastric pain followed by vomiting.Physical examination (12/19/03) revealed heart rate of 80 bpm, 180/100 mmHg blood pressure, crepitant rales at both hemithorax bases, with no positive data in the remaining of the test.The EKG (12/29/03) displayed sinus rhythm, 72-bpm heart rate, electrically negative anteroseptal area, an elevated ST segment from V 1 to V 3 , and depressed in II, III, aVF, V 5, and V 6 derivations. Changes remained after use of sublingual-administrated 5mg of isosorbide dinitrate (figure 4).Laboratorial tests showed 1 mg/dl of creatinine, 43 mg/dl of urea, 139 mEq/l of sodium, 5.8 mEq/l of potassium, 49.4 ng/ml of CKMB, and 7.8 ng/ml of troponin.Myocardial infarction diagnosis was performed and 200mg per oral acetylsalicylic acid and endovenous nitroglycerin were administrated. Blood pressure was controlled and the patient sent to cinecoronariography for mechanical coronary reperfusion through angioplasty.Cineangiography, 60 minutes after the patient had arrived at the hospital, did not display coronary obstructions. Despite dyskinetic area in left ventricular anterolateral and apical walls, the patient showed asystole cardiopulmonary arrest, without response to resuscitation procedures, and died (12/30/03).Examination Explanation -graphic methods and imaging: At September 30, 2003 EKG (figure 1) junctional rhythm, 50-heartbeat-per...