A nurse is caring for a client who is postoperative following knee arthroplasty and has a new prescription for enoxaparin 1mg/kg subcutaneous. The client weighs 185 lb. How many mg should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A. Urinary tract infection
The symptoms described, including recent mental status changes and periods of incontinence, are suggestive of a urinary tract infection (UTI) in an elderly individual. UTIs are common among older adults and can cause a variety of symptoms, including confusion, which is often the primary manifestation in the elderly population. Other symptoms can include urinary urgency, frequency, and incontinence.

B. Acute kidney failure - While acute kidney failure can cause changes in urination and mental status, it is less likely to be the primary cause of these symptoms in this scenario. UTI is a more common and immediate concern given the symptoms described.

C. Septic shock - Septic shock is a severe condition that occurs when an infection leads to a life-threatening drop in blood pressure. While septic shock can cause altered mental status, it is a critical condition that often presents with more dramatic symptoms and requires immediate intensive care management. The symptoms described are more suggestive of a UTI.

D. Urinary stasis - Urinary stasis refers to the slowing or cessation of urine flow. While urinary stasis can contribute to the development of UTIs, it is not a condition that would cause sudden and acute mental status changes and incontinence on its own. UTI is a more likely cause of the symptoms described.

A. Increased thickness of the subcutaneous skin layer - Aging typically results in thinning of the skin and subcutaneous tissue, making older adults more vulnerable to pressure ulcers rather than having increased thickness.

B. Changes in the character and quantity of bacterial skin flora - This is a common age-related change; however, it is not directly related to the course of treatment for a sacral pressure ulcer. Proper wound care can mitigate the impact of changes in skin flora.

C. Increased time required for wound healing - Aging often leads to a decline in the body's ability to repair and regenerate tissues, which can prolong the healing process of wounds, including pressure ulcers. Older adults may experience delayed wound healing compared to younger individuals.

D. Increased elasticity of the skin - Skin elasticity decreases with age, making older adults more susceptible to skin breakdown and pressure ulcers due to reduced skin resilience and ability to redistribute pressure. Increased elasticity would not affect the course of treatment positively but rather negatively in this context.