The nurse is reviewing the arterial blood gas (ABG) sample for a client admitted with dehydration:

pH 7.47

PaCO2 47 mmHg

PaO2 88 mmHg

HCO3 31 mEq/L

The correct interpretation of the ABG results is _____ (Select..)

A.A urine specific gravity of 1.038 is significantly elevated above the normal physiological range of 1.005 to 1.030. This finding indicates that the urine remains highly concentrated, suggesting that the kidneys are still conserving water due to a continued state of fluid volume deficit. Effective rehydration would result in a lower, more dilute specific gravity as the circulating volume and renal perfusion normalize.

B.A urine output of 25 mL/hour is below the standard clinical threshold of 30 mL/hour, which is the minimum required to ensure adequate organ perfusion and metabolic waste excretion. Persistent oliguria indicates that the compensatory mechanisms for dehydration are still active and that the fluid resuscitation has not yet achieved hemodynamic stability. The nurse should continue to monitor and potentially escalate fluid therapy until output meets or exceeds 30 mL/hour.

C.A mean arterial pressure of 58 mmHg is critically low and insufficient to maintain adequate perfusion to vital organs, particularly the brain and kidneys. Normal mean arterial pressure should be maintained at 65 mmHg or higher to ensure systemic homeostasis. This hypotensive value suggests that the client is still experiencing a significant volume deficit or is potentially progressing toward hypovolemic shock despite the current IV fluid replacement.

D.A heart rate of 88 beats/minute falls within the normal adult reference range of 60 to 100 beats/minute. Dehydration typically causes compensatory tachycardia as the body attempts to maintain cardiac output in the presence of decreased stroke volume. The normalization of the heart rate is a reliable indicator that the intravascular volume has been restored and the sympathetic nervous system's compensatory drive has decreased.

A.A high intake of red meat is actually a protective factor against iron deficiency anemia because red meat is a rich source of heme iron. Heme iron has a higher bioavailability and is absorbed more efficiently by the intestinal mucosa than non-heme iron found in plant sources. Therefore, a diet high in red meat would decrease rather than increase the risk of developing a depleted iron store in the body.

B.Gastrointestinal bleeding is a primary cause of iron deficiency anemia in adults because it results in the chronic loss of hemoglobin-bound iron. Even occult blood loss from ulcers, diverticulosis, or malignancies can gradually deplete the body's iron reserves faster than they can be replenished through dietary intake. Identifying potential sites of blood loss is a critical step in diagnosing the underlying etiology of microcytic, hypochromic anemia.

C.Current pregnancy significantly increases the physiological demand for iron to support the expansion of maternal red cell mass and the development of the fetus and placenta. If dietary intake or supplementation is insufficient to meet these elevated requirements, the mother is at high risk for gestational iron deficiency anemia. This state of increased demand is a well-recognized risk factor requiring routine monitoring of hemoglobin and ferritin levels during the prenatal period.

D.A poor appetite often leads to inadequate dietary intake of essential nutrients, including iron, which is necessary for the synthesis of hemoglobin. Over time, a caloric or nutrient-restricted diet prevents the body from replacing the iron lost through normal cellular turnover and excretion. This risk factor is particularly common in geriatric populations or individuals with chronic illnesses where nutritional intake is compromised, leading to a gradual depletion of iron.

E.While some vegetables contain non-heme iron, a low intake of vegetables is not as significant a risk factor for iron deficiency as the lack of animal proteins or the presence of active bleeding. Many individuals maintain adequate iron levels through other food groups, and the iron in vegetables is less easily absorbed than that found in meat. Therefore, focusing on vegetable intake alone is not a primary diagnostic indicator for this type of anemia.