A nurse is caring for a client who has an infection caused by Streptococcus pyogenes. The nurse understands that this microorganism belongs to what group of bacteria?

Choice A reason:

Decreased hematocrit is an indicator of improvement for a client who has hypovolemia and is receiving IV fluid therapy. Hematocrit is the percentage of red blood cells in the blood. Hypovolemia causes hemoconcentration, which increases the hematocrit level. IV fluid therapy restores the blood volume and dilutes the red blood cells, which decreases the hematocrit level.

Choice B reason:

Increased urine specific gravity is not an indicator of improvement for a client who has hypovolemia and is receiving IV fluid therapy. Urine specific gravity is a measure of the concentration of solutes in the urine. Hypovolemia causes dehydration, which increases the urine specific gravity. IV fluid therapy rehydrates the body and lowers the urine specific gravity.

Choice C reason:

Decreased central venous pressure is not an indicator of improvement for a client who has hypovolemia and is receiving IV fluid therapy. Central venous pressure is a measure of the pressure in the right atrium and vena cava. Hypovolemia causes decreased preload, which lowers the central venous pressure. IV fluid therapy increases preload and raises the central venous pressure.

Choice D reason:

Increased blood urea nitrogen is not an indicator of improvement for a client who has hypovolemia and is receiving IV fluid therapy. Blood urea nitrogen is a measure of the amount of urea in the blood. Urea is a waste product of protein metabolism that is excreted by the kidneys. Hypovolemia causes decreased renal perfusion, which increases the blood urea nitrogen level. IV fluid therapy improves renal perfusion and lowers the blood urea nitrogen level.

Choice A reason:

This is an incorrect answer because cardiogenic shock is a severe form of heart failure that occurs when the heart cannot pump enough blood to maintain adequate tissue perfusion and oxygenation, resulting in hypotension, tachycardia, oliguria, altered mental status, and cold and clammy skin.

Choice B reason:

This is an incorrect answer because pulmonary embolism is a condition in which a blood clot travels to the lungs and blocks one or more pulmonary arteries, causing sudden dyspnea, chest pain, hemoptysis, tachypnea, and hypoxia.

Choice C reason:

This is a correct answer because right-sided heart failure occurs when the right ventricle of the heart fails to pump blood effectively to the lungs, causing blood to back up in the systemic circulation and leading to fluid accumulation in the lungs, neck veins, and extremities.

Choice D reason:

This is an incorrect answer because left-sided heart failure occurs when the left ventricle of the heart fails to pump blood effectively to the body, causing blood to back up in the pulmonary circulation and leading to pulmonary congestion, dyspnea, orthopnea, coughing, and fatigue.