A 22-year-old dialysis patient presents to the ER with chest pain and palpitations. Laboratory tests reveal a Potassium (K+) level of 7.0 mEq/L. Which electrolyte imbalance is the patient suffering from?

B. One of the significant changes that occur with aging is a decline in kidney function. This includes a decrease in renal blood flow, glomerular filtration rate (GFR), and the ability of the kidneys to concentrate urine. These changes can impair the body's ability to conserve water and maintain electrolyte balance, increasing the risk of dehydration.

A. As individuals age, there is actually a decrease in the percentage of body water relative to lean body mass. This is because aging is associated with an increase in adipose tissue and a decrease in muscle mass, which affects the overall body composition.

C Saliva production typically decreases with age, rather than increases. Reduced saliva production can contribute to dry mouth and may affect hydration status indirectly, but it is not a primary factor in increasing dehydration risk in older adults.

D. While changes in blood pressure can occur with aging, such as an increase in systolic blood pressure due to arterial stiffening, this does not directly contribute to an increased risk of dehydration. Blood pressure changes are more related to cardiovascular health rather than fluid balance.

B. This method is recommended because the deltoid muscle is a large, rounded, triangular muscle that covers the shoulder joint.

A. This description is for locating the vastus lateralis muscle, which is commonly used for intramuscular injections in infants and young children, not adults.

C. This technique is used for locating the rectus femoris muscle, another site for intramuscular injections in infants and young children, not adults.

D. This location is too low, which could miss the muscle tissue and reduce the effectiveness of the vaccine.