<prompt> Most common type of shock is-CardiogenicVagalNeurogenicDistributive  <response>: Cardiogenic shock CS is characterized by systemic hypoperfusion due to severe depression of the cardiac index and sustained systolic aerial hypotension 90 mmHg despite an elevated filling pressure . It is associated with in-hospital moality rates 50. . Circulatory failure based on cardiac dysfunction may be caused by primary myocardial failure, most commonly secondary to acute myocardial infarction MI , and less frequently by cardiomyopathy or myocarditis, cardiac tamponade, or critical valvular hea disease.Most patients have continuing chest pain and dyspnea and appear pale, apprehensive, and diaphoretic. Mentation may be altered, with somnolence, confusion, and agitation. The pulse is typically weak and rapid, often in the range of 90-110 beatsmin, or severe bradycardia due to high-grade hea block may be present. Systolic blood pressure is reduced 90 mmHg with a narrow pulse pressure 30 mmHg, but occasionally BP may be maintained by very high systemic vascular resistance. Tachypnea, Cheyne-Stokes respirations, and jugular venous distention may be present. The precordium is typically quiet, with a weak apical pulse. S 1 is usually soft, and an S 3 gallop may be audible. Acute, severe MR and VSR usually are associated with characteristic systolic murmurs Rales are audible in most patients with LV failure causing CS. Oliguria urine output 30 mLh is common. ref:harrison;s principles of internal medicine,ed 18,pg no 2232 