Neurologic Case Study

Patient Profile:

• Age: 68 years
• Gender: Male
• Medical History: Hypertension, Type 2 Diabetes Mellitus
• Medications: Lisinopril, Metformin
• Allergies: None

Chief Complaint: The patient presents to the emergency department (ED) with sudden onset of right-sided weakness and difficulty speaking that began approximately 1 hour prior to arrival.

Exhibits

Which condition is the patient most likely experiencing?

Choice A reason: Hypoglycemia typically presents with symptoms such as sweating, trembling, hunger, confusion, and in severe cases, loss of consciousness. The patient's symptoms of sudden right-sided weakness and difficulty speaking are more consistent with a neurological event rather than low blood sugar levels.

Choice B reason: Hemorrhagic stroke involves bleeding within the brain. Although it can present with similar symptoms to ischemic stroke, the diagnostic tests indicate no evidence of hemorrhage. This makes a hemorrhagic stroke less likely.

Choice C reason: Ischemic stroke occurs when a blood clot blocks a blood vessel in the brain, leading to reduced blood flow and oxygen to a part of the brain. The patient's symptoms of sudden right-sided weakness and expressive aphasia are classic signs of an ischemic stroke, and the absence of hemorrhage on the head CT scan supports this diagnosis.

Choice D reason: Multiple sclerosis (MS) is a chronic, progressive disease that affects the central nervous system. It usually presents with episodic neurological symptoms rather than the sudden onset seen in this patient. MS symptoms develop over time and can vary widely, whereas the patient's acute presentation is more indicative of a stroke.

Choice A reason: Metabolic acidosis is characterized by a decrease in blood pH (less than 7.35) due to a primary decrease in bicarbonate (HCO₃). The arterial blood gas results in this scenario do not indicate metabolic acidosis, as the pH is elevated and HCO₃ is within the normal range.

Choice B reason: Metabolic alkalosis is characterized by an increase in blood pH (greater than 7.45) due to a primary increase in bicarbonate (HCO₃). In this case, the pH is indeed elevated, but the bicarbonate level is normal, making this condition unlikely.

Choice C reason: Respiratory acidosis is characterized by a decrease in blood pH (less than 7.35) due to a primary increase in PaCO₂. The arterial blood gas results show an elevated pH and a decreased PaCO₂, which are not consistent with respiratory acidosis.

Choice D reason: Respiratory alkalosis is characterized by an increase in blood pH (greater than 7.45) due to a primary decrease in PaCO₂. In this scenario, the pH is elevated at 7.48, and the PaCO₂ is decreased at 32 mm Hg, indicating respiratory alkalosis. The bicarbonate level is within the normal range, further supporting this interpretation.