<prompt> Severe hypovalemic shock occurs when blood volume less is -10203040 deg,10  <response>: Ans. is d i.e., 40 Hvpovolemic shock Hypovolemic shock is the most common form of shock. This is due to decrease in blood volume either by loss of blood or plasma. Grading of hypovolemic shock o Mild hypovolemia -- When volume loss is less than 20. There is generally mild tachycardia but relatively few external signs. o Moderate hypovolemia -- When volume loss is between 20-40. Normal blood pressure is maintained in supine position, but there is postural hypotension and tachycardia on erect posture. o Severe hypovolemia - When volume loss is 40. The classical signs of shock appear i.e., marked tachycardia, hypotension, disorientation. o This is due to decrease in blood volume either by loss of blood or plasma. Grading of hypovolemic shock o Mild hypovolemia -- When volume loss is less than 20. There is generally mild tachycardiabut relatively few external signs. o Moderate hypovolemia -- When volume loss is between 20-40. Normal blood pressure is maintained in supine position, but there is postural hypotension and tachycardia on erect posture. o Severe hypovolemia - When volume loss is 40. The classical signs of shock appear i.e.,marked tachycardia, hypotension, disorientation. 