<prompt> 42 yrs old man presented with dizziness on standing, SBP falls by 50 mm Hg and HR is 52min likely cause is -CHFInferior wall MIPheochromocytomaTheophylline toxicity  <response>: Cardiac arrest due to bradyarrhythmias or asystole BA cardiac arrest is managed differently. The patient is promptly intubated, CPR is continued, and an attempt is made to control hypoxemia and acidosis. Epinephrine andor atropine are given intravenously or by an intracardiac route. External pacing devices are used to attempt to establish a regular rhythm. The success rate may be good when BA arrest is due to ACUTE INFERIOR WALL MYOCARDIAL INFARCTION or to correctable airway obstruction or drug-induced respiratory depression or with prompt resuscitation effos. ref:harrison;s principles of internal medicine,ed 18,pg no 2245 