Circulatory shock is a specific state when the reduced oxygenation of tissues is observed because of the ineffective circulation of the intravascular volume. As a result, tissues do not receive enough oxygen and nutrients because of the limited cardiac output, and this state is associated with hypoperfusion, or decreased blood flow, and the disproportionately distributed blood flow (Vincent & De Backer 2013). The result of shock is cellular hypoxia, and this circulatory malfunction is viewed as a life-threatening condition. The purpose of this case study is to analyze the shock state of a 72-year-old male who was brought to the emergency department with signs and symptoms of fever and confusion. Definition and Explanation of the Shock Category The first question that should be answered while working with this patient in the emergency department is about his shock and its category. The examined 72-year-old male is in shock because such signs as hypotension (blood pressure is 76/44 mmHg) and confusion can be observed, and his skin is warm to touch, but with cool peripheries. The cellular metabolic oxygen demand is decreased and not met because of the results of the Arterial Blood Gas Analysis. Thus, the patient’s PaO2 is decreased (65 mmHg, 80-100 mmHg is normal), and SaO2 is also decreased (91%, 95%-100% is normal). These results indicate mild hypoxemia, thus, the amount of oxygen in the blood is decreased (Vincent & De Backer 2013). The preload (CVP is 3 mmHg) is within a normal range (2-6 mmHg), but it is rather low. The decreased preload indicates that the patient will respond to fluids. Thus, this patient is fluid responsive, and his afterload is also decreased because SVRI (Systemic Vascular Resistance Index) is 1100 dynes/sec/cm 5 /m 2 when a normal range is 1600-2400 dynes/sec/cm 5 /m 2 . The patient’s cardiac contractility or pump function is increased as Cardiac Index is 6.3 mls/min/m 2 when a normal range is 2.5-4 mls/min/m 2 . While analyzing the test results, it is also important to refer to perfusion endpoints that are relevant when assessing shock. They include the lactate level that is 5.1 mmol/L (>4 mmol/L) and systemic oxygen consumption (Cecconi et al. 2014; Hasanin 2015). The lactate level is increased, and systemic oxygen consumption is decreased. They analyzed patient data allow for identifying the category of shock that is related to this case. The following categories of shock can be differentiated: hypovolaemic, obstructive, cardiogenic, and distributive. After analyzing the data, it is possible to state that the normal or decreased preload, the decreased afterload, and the increased cardiac contractility are associated with distributive shock (Seymour & Rosengart 2015). Thus, distributive shock can be defined as a category of shock that is characterized by the affected distribution of blood flow because of under perfused capillaries. The excessive systemic vasodilation with hypovolemia is a typical feature of this shock (Gupta et al. 2015). Distributive shock is associated with septic shock, anaphylaxis, neurogenic shock, and systemic inflammatory response syndrome (Seymour & Rosengart 2015). Depending on the patient’s past medical history, it is possible to exclude anaphylaxis