Tachycardia is an early sign of hypovolemic shock, which is a life-threatening condition caused by excessive blood loss. Tachycardia is the body’s attempt to compensate for the reduced blood volume and maintain adequate blood pressure and perfusion to vital organs.

Choice B. Hypotension is wrong because it is a late sign of hypovolemic shock, indicating severe blood loss and decompensation.

Hypotension can lead to organ failure and death if not corrected promptly.

Choice C. Oliguria is wrong because it is not a specific sign of hypovolemic shock, but rather a consequence of reduced renal perfusion due to low blood pressure and volume.

Oliguria can also be caused by other factors such as dehydration, urinary tract obstruction, or renal disease.

Choice D. Pallor is wrong because it is not a reliable sign of hypovolemic shock, as it can be influenced by skin color, temperature, and lighting conditions.

Pallor can also occur in other conditions such as anemia, hypoxia, or vasovagal syncope.

Normal ranges for vital signs in postpartum women are:

• Heart rate: 60-100 beats per minute

• Blood pressure