An internal medicine physician is called to evaluate a 68-year-old female patient in the o… — USMLE Step 2 CK

An internal medicine physician is called to evaluate a $68$ -year-old female patient in the observation unit who is reporting progressive shortness of breath and profound fatigue that has worsened over the past three weeks. The patient has a background of rheumatoid arthritis, currently managed with daily naproxen, as well as hypothyroidism. Upon assessment, she appears pale and lethargic. Vital signs indicate a heart rate of $112/\text{min}$ , respiratory rate of $22/\text{min}$ , blood pressure of $105/65\text{ mmHg}$ , and a temperature of $37.6^\circ\text{C}$ ( $99.7^\circ\text{F}$ ).

A physical examination reveals prominent conjunctival pallor and trace pitting edema in both ankles, but pulmonary auscultation is unremarkable with clear breath sounds bilaterally.

Laboratory analysis is immediately obtained and returns the following results:

Test	Result	Reference Range
Hemoglobin	$6.5\text{ g/dL}$	$12.0-15.5\text{ g/dL}$
Mean corpuscular volume (MCV)	$71\text{ fL}$	$80-100\text{ fL}$
Leukocyte count	$9,500/\text{mm}^3$	$4,500-11,000/\text{mm}^3$
Platelet count	$480,000/\text{mm}^3$	$150,000-400,000/\text{mm}^3$
Thyroid-stimulating hormone (TSH)	$6.2\text{ mU/L}$	$0.4-4.0\text{ mU/L}$
Free thyroxine (T4)	$1.1\text{ ng/dL}$	$0.9-1.7\text{ ng/dL}$
Blood urea nitrogen (BUN)	$22\text{ mg/dL}$	$7-20\text{ mg/dL}$
Creatinine	$1.1\text{ mg/dL}$	$0.6-1.2\text{ mg/dL}$

Which of the following is the most appropriate next step in the management of this patient?

A
Administer intravenous furosemide and obtain a transthoracic echocardiogram
B
Increase the levothyroxine dose and schedule a follow-up in six weeks
Transfuse packed red blood cells and arrange for gastrointestinal endoscopyCevap
D
Initiate empiric intravenous piperacillin-tazobactam therapy
E
Obtain an arterial blood gas to calculate respiratory compensation

Cevap

The most appropriate next step is to transfuse packed red blood cells and arrange for gastrointestinal endoscopy.

This patient presents with highly symptomatic, severe microcytic anemia (hemoglobin of 6.5 g/dL and mean corpuscular volume of 71 fL), likely iron deficiency anemia secondary to chronic gastrointestinal blood loss from daily naproxen use. According to current guidelines, a hemoglobin level below 7.0 g/dL (or < 8.0 g/dL in highly symptomatic patients) is a strong indication for packed red blood cell transfusion to restore oxygen-carrying capacity. Following immediate stabilization, the source of the bleeding must be identified; therefore, endoscopic evaluation (esophagogastroduodenoscopy and colonoscopy) is the most appropriate next step in management.

Adım Adım Çözüm

Identify the primary physiological derangement in the patient's presentation.

The patient has severe, symptomatic microcytic anemia with a hemoglobin of 6.5 g/dL and an MCV of 71 fL.

Recognizing the profound anemia unifies the clinical picture and explains the compensatory tachycardia, tachypnea, and fatigue.

Determine the immediate indication for blood transfusion.

Transfusion of packed red blood cells is immediately indicated.

Current guidelines recommend transfusion for hemoglobin levels < 7.0 g/dL (or higher in highly symptomatic patients) to quickly restore oxygen-carrying capacity and prevent end-organ ischemia.

Identify the likely etiology of the anemia and the necessary definitive diagnostic workup.

The patient's chronic naproxen use places her at high risk for gastrointestinal bleeding, necessitating subsequent endoscopic evaluation.

Iron deficiency anemia in an older adult must always be evaluated for gastrointestinal blood loss (e.g., NSAID-induced ulceration, malignancy) to address the root cause.

Anahtar Kavram

Management of severe symptomatic microcytic anemia involves immediate stabilization with packed red blood cell transfusion, followed by investigation of the underlying cause, typically via gastrointestinal endoscopy in older adults with risk factors such as chronic NSAID use.

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