Rheum
CVS
GI
Pulm
Heme onc
100

A 48-year-old woman is evaluated for sicca.

She has a 2-year history of Sjögren syndrome.

Chewing sugarless gum and taking frequent

small sips of water are increasingly less helpful

for oral dryness. Current medications are

artificial tears and ophthalmic cyclosporine.

She has no other concerning symptoms.

On physical examination, vital signs are

normal. Other than dry oral mucosa, the

examination is normal.

Which of the following is the most

appropriate treatment?


Cevimeline

Hydroxychloroquine

Low-dose prednisone

Rituximab

Cevimeline

100

A 70-year-old woman is evaluated in follow-up for peripheral artery disease. She walks 2 miles daily, and her symptoms force her to stop several times. Medical history is otherwise significant for hypertension and hyperlipidemia. She has a 50-pack-year smoking history but quit 10 years ago. Medications are aspirin, cilostazol, lisinopril, and amlodipine. She was prescribed atorvastatin, but she took the medication for only 1 week after reading that muscle ache is an adverse effect.

Which of the following is the most appropriate treatment?

Atorvastatin

Colestipol

Ezetimibe

Icosapent ethyl

Atorvastatin 

100

A 72-year-old woman is hospitalized for subacute onset of jaundice that developed 5 days ago on the second day of a cruise to Central America. She has no known liver disease and reports consuming fewer than three drinks per week. She has no abdominal pain, nausea, or vomiting. Five weeks ago she was treated with amoxicillin-clavulanate for an episode of acute diverticulitis.

On physical examination, vital signs are normal. Icterus and jaundice are observed. There are no signs of chronic liver disease. Mental status is normal, and no asterixis is seen.

Alkaline phosphatase -200 U/L

Alanine aminotransferase -57 U/L

Aspartate aminotransferase -70 U/L

Total bilirubin 15 mg/dL (256.5 μmol/L)

INR 1.0

Right-upper-quadrant ultrasound shows no gallbladder stones or biliary dilation, a normal-size liver, and no masses.

Which of the following is the most likely diagnosis?

Autoimmune hepatitis

Drug-induced liver injury

Hepatitis A virus infection

Primary biliary cholangitis

Drug induced liver injury 

100

A 34-year-old woman with fistulizing Crohn disease is evaluated in the ICU 10 days after she was admitted with surgical complications. She has been unable to be weaned from mechanical ventilation. Tube feedings were initiated 48 hours after ICU admission but have not advanced above 50% of her nutritional goal because of recurrent abdominal distention and emesis. She has lost 1.8 kg (4 lb) over the last week. The ileostomy bag contains gas and liquid feces. Medications are low-molecular-weight heparin, metoclopramide, fentanyl, piperacillin-tazobactam, mesalamine, and oral budesonide.

On physical examination, vital signs are normal. BMI is 20. She is intubated, on mechanical ventilation, and a nasogastric feeding tube is in place. She has a healing abdominal surgical wound and an ileostomy. Bowel sounds are present, and the abdomen is distended.

Abdominal radiograph reveals gas throughout the small bowel and no evidence of obstruction.

Which of the following is the most appropriate management?

Add megestrol acetate

Add methylnaltrexone

Increase fiber in the enteral diet

Stop enteral nutrition; start parenteral nutrition

Stope enteral nutrition and start parenteral

  • Enteral nutrition should start within 24 to 48 hours of admission in critically ill patients.
  • In critically ill patients, supplemental parenteral nutrition should be started after 7 to 10 days of inability to achieve more than 60% of energy and protein requirements by the enteral route alone.
100

A 68-year-old man is evaluated for early satiety and right upper quadrant discomfort. He is otherwise well. He reports that he is still working full time and walks about a half mile to and from work each day.

On physical examination, vital signs are normal. Examination is notable for hepatomegaly.

Complete blood count is normal. On serum chemistry testing, alkaline phosphatase and aminotransferase levels are elevated; bilirubin and creatinine levels are normal.

CT scan of the chest, abdomen, and pelvis shows hepatomegaly with multiple metastatic lesions and abdominal carcinomatosis with a small amount of ascites. No other abnormalities are noted. Liver biopsy reveals adenocarcinoma.

The patient is diagnosed with metastatic cancer from an unknown primary.

Which of the following is the most appropriate management?

Measure serum CA-19-9, CA-15-3, and CA-125 antigens

Obtain a gene expression array PET

Upper endoscopy, wireless capsule endoscopy, and colonoscopy

No additional testing; initiate combination chemotherapy

No additional testing , initiate combination chemotherapy

This patient has advanced metastatic adenocarcinoma from a cancer of unknown primary (CUP). Diagnostic efforts should focus on identifying whether a patient is among the approximately 20% of patients with CUP who have a more favorable prognosis and who can benefit from a specific treatment strategy. A biopsy obtained from the site that can be sampled in the safest, least invasive manner is performed, and specimens are evaluated by immunohistochemical stains consistent with the tumor's pattern of presentation to attempt to establish a diagnosis of a more treatable subtype of CUP (for example, germ cell tumor or lymphoma). The clinical evaluation should not involve an exhaustive search for a primary site because detection of an asymptomatic and occult primary tumor does not improve outcome

200

A 52-year-old woman is evaluated at a follow-

up visit. Dermatomyositis was diagnosed 4

weeks ago; she was positive for anti-Mi-2

antibodies. Prednisone has improved

heliotrope and photosensitive rashes and

proximal muscle weakness. She is currently

asymptomatic. Current medication is

prednisone, 60 mg/d. She is participating in

physical therapy.

On physical examination, vital signs are

normal. There is no rash. Muscle strength is

normal.

Serum creatine kinase A level is 200 U/L,

decreased from 520 U/L 1 month ago.

Results of screening colonoscopy,

mammography, and cervical cancer screening are all normal.

Which of the following is the most

appropriate treatment?

Add hydroxychloroquine

Add methotrexate

Add rituximab

Continue current therapy

Methotrexate

200

A 35-year-old man is evaluated for exertional dyspnea. His history is otherwise unremarkable.

On physical examination, vital signs and oxygen saturation are normal. Central venous pressure is elevated. A left parasternal impulse is present. A grade 2/6 systolic murmur is heard at the second left intercostal space, and a diastolic flow rumble is heard at the left sternal border. Fixed splitting of the S2 is present. The remainder of the physical examination is normal.

An ECG demonstrates sinus rhythm with right axis deviation and incomplete right bundle branch block. A transthoracic echocardiogram demonstrates a 1.5-cm ostium secundum atrial septal defect, with moderate right heart enlargement. Left ventricular cavity size and function are normal. The estimated right ventricular systolic pressure is 30 mm Hg.

Which of the following is the most appropriate management?

Atrial septal defect closure

Cardiopulmonary exercise testing

Coronary angiography

Echocardiographic surveillance

ASD closure

200

A 64-year-old man is evaluated in the emergency department for ascites. He has diabetes mellitus and cirrhosis associated with hemochromatosis, as well as a history of hepatic encephalopathy. Current medications are metformin, canagliflozin, lactulose, and rifaximin.

On physical examination, blood pressure is 106/76 mm Hg and pulse rate is 60/min; other vital signs are normal. The patient is alert. Jaundice, spider telangiectasia, and palmar erythema are present. Jugular venous distension and peripheral edema are present. Cardiac sounds are indistinct and lung sounds are diminished. Ascites is present.

Abdominal ultrasound shows a cirrhotic liver, splenomegaly, and abdominal ascites.

Paracentesis with analysis of ascitic fluid shows a leukocyte count  of 100/μL (100 × 109/L), albumin  level of 2.2 g/dL (22 g/L), and total protein level of 2.6 g/dL (26 g/L). Serum albumin  level is 3.5 g/dL (35 g/L).

Which of the following is the most appropriate management?


Ascitic fluid cytology

Ascitic fluid triglyceride measurement

Echocardiography

Liver biopsy

Echocardiography

200

A 44-year-old woman is evaluated for daytime sleepiness of 1 year's duration. She sleeps 8 to 9 hours nightly. She naps during the day. She has chronic musculoskeletal back pain and depression. Medications are venlafaxine and sustained-release oxycodone.

On physical examination, respiration rate is 12/min; the remainder of the vital signs are normal. She has antalgic gait and limited trunk flexion due to pain. Oropharyngeal airway is patent. Nasal, lung, and heart examinations are normal. There is no peripheral edema.

Polysomnography documents central sleep apnea without obstructive sleep apnea.

Which of the following is the most appropriate treatment?

Adaptive servo-ventilation

Continuous positive airway pressure

Modafinil

Pain rehabilitation program

  • Pain rehabilitation program
  • The initial management of central sleep apnea should target modifiable risk factors such as the reduction or elimination of opioids or medical optimization of heart failure.
200

A 51-year-old man is evaluated following biopsy of the prostate gland. His father died of prostate cancer at the age of 60 years, and his mother was diagnosed with breast cancer at the age of 45 years.

Biopsy of the prostate revealed adenocarcinoma with bilateral gland involvement; his Gleason score was 9. Bone scan confirmed multiple osseous metastatic lesions.

Which of the following is the most appropriate management?

Cystoscopy

PET/CT

Prostate-specific antigen density measurement

Referral to a genetic counselor

Referral to a genetic counselor

  • Patients with high-risk prostate cancers (high Gleason score, lymph node metastases, or distant metastatic disease) should be referred for genetic counseling, as the risk of a BRCA mutation is approximately 12%.
  • In men with prostate cancer, a family history of breast cancer in a first-degree relative diagnosed before the age of 50 years is also an indication for BRCA-related genetic counseling
300

A 39-year-old woman is evaluated for newly

discovered neutropenia. She has a 10-year

history of severe, difficult-to-control rheumatoid

arthritis. She has no sicca symptoms. Current

medications are prednisone, methotrexate,

folic acid, and adalimumab.

On physical examination, vital signs are

normal. There are rheumatoid nodules over

the olecranon processes. The spleen tip is

palpable. Joint examination reveals ulnar

deviation, subluxation at the

metacarpophalangeal joints, reduced range of

motion at the wrists, and bilateral swelling of

the wrists and left ankle.

Absolute neutrophil

count - 1100/uL (1.1 x109/L)

Leukocyte count- 3800/ML (3.8 x109/L)

Lymphocyte count- Normal

Platelets- Normal

Urinalysis- Normal 

Which of the following is the most likely diagnosis?

AAA amyloidosis

Felty syndrome

Sjögren syndrome

Systemic lupus erythematosus


Felty syndrome 

300

A 71-year-old man is evaluated for a 6-month history of exertional chest pain. The pain has increased in frequency and now occurs earlier during his exercise regimen. The pain is relieved by sublingual nitroglycerin. He underwent coronary artery bypass graft surgery 4 years ago. History is also significant for hypertension and hyperlipidemia. Medications are metoprolol, lisinopril, atorvastatin, and aspirin.

Physical examination findings, including vital signs, are normal.

ECG shows left bundle branch block.

Which of the following is the most appropriate test?


Dobutamine echocardiography

Exercise ECG

Exercise single-photon emission CT

Vasodilator single-photon emission CT

Vasodilator single photon emission CT

300

48-year-old man is evaluated for follow-up of cirrhosis due to hepatitis C virus (HCV) infection. He has ascites responsive to furosemide and spironolactone and recent-onset hepatic encephalopathy treated with lactulose. He has a MELD-Na (Model for End-Stage Liver Disease–sodium) score of 12. He takes no additional medications.

On physical examination, vital signs are normal. Physical examination reveals spider angiomas, abdominal distention, and a palpable liver edge below the right costal margin.

Laboratory studies:

Prothrombin time  14.6 s

Total bilirubin  2.6 mg/dL (44.5 μmol/L)

Creatinine  0.8 mg/dL (70.7 μmol/L)

HCV DNA 600,000 U/mL

Which of the following is the most appropriate management?

Initiate protease inhibitor–based direct-acting antiviral therapy

Initiate rifaximin therapy

Limit dietary protein

Refer for liver transplantation

Refer for Liver transplantation

300

A 67-year-old man is evaluated before airline travel. He is planning a trip to Hawaii next month. He has COPD and becomes dyspneic when walking short distances on level ground. Results of his last pulmonary function test indicated an FEV1  of 40% of predicted. He has not yet required oxygen supplementation. Medications are tiotropium, salmeterol, and fluticasone and albuterol inhalers.

On physical examination, respiration rate is 16/min. Auscultation of the lungs reveals a prolonged expiratory phase with no wheezes.

Which of the following is the most appropriate next step?

High-altitude simulation test

Recommend against air travel

Resting pulse oximetry

No further testing needed

  • Resting pulse oximetry
  • Resting pulse oximetry is helpful in screening patients for in-flight hypoxemia.
  • Patients not using baseline oxygen and with a resting SpO2 less than 92% should be prescribed supplemental oxygen during air travel without additional testing
300

A 58-year-old woman is evaluated for a 6-week history of fatigue, anorexia, and abdominal distention. She has lost 2.3 kg (5 lb) over the past week. For the past 4 days, she has been so debilitated that she has difficulty ambulating due to abdominal pain and fatigue; she has been bedbound for the past 48 hours. Prior to this, she had been working full time and running approximately 12 miles per week. Medical history is otherwise unremarkable, and she takes no medications.

On physical examination, vital signs are normal. Abdominal examination reveals distention with normal bowel sounds. The liver edge is palpable 4 cm below the right costal margin. Stool sample is guaiac-positive.

Laboratory studies:

Hemoglobin -9.7 g/dL (97 g/L)

Bilirubin -2.3 mg/dL (39.3 µmol/L)

Creatinine - 0.9 mg/dL (79.6 µmol/L)

Contrast-enhanced CT scan demonstrates a mass in the descending colon and hepatomegaly with multiple metastatic lesions. A colonoscopy identifies a mass in the left colon, and a biopsy shows adenocarcinoma

Which of the following is the most appropriate management?

Fluorouracil

Fluorouracil and oxaliplatin

Hemicolectomy

Supportive, comfort-oriented care

Fluorouracil and oxaliplatin 

  • In the treatment of cancer, it is important to differentiate patients with a poor performance status who are debilitated due to chronic precancer comorbidities from patients who would otherwise be medically fit but are acutely debilitated by their cancer.
400

A 27-year-old woman is evaluated for a 4-year history of progressive achy and stiff low back pain that wakes her up at night and a 2-year history of intermittent, severe, sharp bilateral buttock pain. She has stiffness for 90 minutes each morning. Exercise and ibuprofen help relieve pain. She has a history of unilateral uveitis. She has no children.

On physical examination, vital signs are normal. Range of motion of the lumbar spine is decreased in all directions. The eye examination, occiput-to-wall distance, chest expansion, and peripheral joints are normal.

Laboratory studies reveal an elevated blood C-reactive protein level and negative HLA-B27 antigen result.

Radiographs of the pelvis and lumbar spine are normal.

Which of the following is the most appropriate diagnostic test to perform next?

Bone scanning

CT of pelvis

MRI of pelvis

Rheumatoid factor and anti–cyclic citrullinated peptide antibodies

MRI pelvis

400

A 74-year-old man is evaluated in the hospital for a 6-month history of progressive fatigue and exertional dyspnea, along with increasing peripheral edema and abdominal girth over the past 3 months. He also has coronary artery disease, for which he had a coronary artery bypass graft at age 62 years. Medications are metoprolol, low-dose aspirin, and atorvastatin.

On physical examination, vital signs are normal. Jugular venous distention with prominent waveforms is noted. There is no discernable fall in the central venous pressure during inspiration. An early diastolic sound is present. The liver is enlarged and pulsatile. Ascites is present, and peripheral edema extends to the knees bilaterally.

On chest radiograph, sternotomy wires and vascular clips are seen, and small bilateral pleural effusions are present.

Which of the following is the most likely diagnosis?

Cardiac tamponade

Chronic liver disease

Constrictive pericarditis 

Restrictive cardiomyopathy

Constrictive pericarditis

400

A 58-year-old woman is evaluated for treatment of hepatitis C virus (HCV) infection. She has unresectable metastatic pancreatic adenocarcinoma. She requests treatment of her HCV infection.

On physical examination, vital signs are normal. She has jaundice, icterus, and cachexia.

Which of the following is the most appropriate management?

HCV antiviral treatment

HCV viral load measurement and genotyping

Testing for hepatitis B virus and HIV infections

No further HCV-related testing or treatment

No further HCV related testing or treatment

400

An 84-year-old man is evaluated 3 days after he was admitted to the ICU with a right lower lobe infiltrate and presumed sepsis. Prior to admission, the patient had vomited, aspirated, and developed respiratory distress. In the emergency department, temperature was 38.3 °C (100.9 °F); tachypnea, tachycardia, hypoxemia, and hypotension were also present. Chest radiograph on admission showed an infiltrate in the right lower lobe. Intravenous fluids, supplemental oxygen by nasal cannula, and broad-spectrum antibiotics were given. Over the next 24 hours, the patient improved rapidly.

On today's physical examination, temperature is 37.1 °C (98.8 °F), blood pressure is 138/80 mm Hg, pulse rate is 66/min, and respiration rate is 16/min. Oxygen saturation  is 95% with the patient breathing ambient air.

The patient's leukocyte count  is 6,000/μL (6 × 109/L) with a normal differential.

Sputum and blood cultures are negative.

Which of the following is the most appropriate antibiotic management?

Continue antibiotics for 4 additional days

Continue antibiotics for 7 additional days

Continue antibiotics for 10 additional days

Discontinue antibiotics

Discontinue antibiotics 

The 2019 community-acquired pneumonia (CAP) guideline from the American Thoracic Society and the Infectious Diseases Society of America recommends standard empiric treatment for CAP in patients with suspected aspiration pneumonia. Many patients with aspiration pneumonitis experience rapid resolution of symptoms within 24 to 48 hours. In these patients, removal of antibiotics and supportive care alone is preferred. Because this patient improved clinically within 24 hours of admission, aspiration pneumonitis is likely and it is safe to discontinue therapy.

400

A 58-year-old man is evaluated for possible smoldering myeloma. Medical history is unremarkable, and he takes no medications.

On physical examination, vital signs and other examination findings are normal.

Serum protein electrophoresis and immunofixation show an IgA  protein spike of 3.5 g/dL (35 g/L). Bone marrow biopsy reveals 50% clonal plasma cells.

Whole-body low-dose CT scan is negative for bone lesions.

Which of the following is the most appropriate imaging test to perform next?

Bone scan

Skeletal survey

Whole-body MRI

No further testing

Whole body MRI 

  • Low-dose CT (preferred) and PET-CT are recommended as the initial imaging procedure for patients with a monoclonal gammopathy because of increased sensitivity for the detection of lytic lesions.
  • A whole-body low-dose CT scan negative for smoldering myeloma should be followed by a whole-body MRI.
  • Smoldering multiple myeloma (MM) is characterized by a serum M protein level of 3 g/dL (30 g/L) or greater (or ≥500 mg/24 hr of urinary monoclonal free light chains) or bone marrow plasma clonal cells of 10% to 59% and no evidence of myeloma-related signs or symptoms. All patients with MM should be assessed for skeletal lesions at diagnosis, periodically thereafter, and when new symptoms occur
  • MRI has been found to be more sensitive in identifying myeloma-related bone lesions and soft tissue lesions from plasmacytoma but is more inconvenient for the patient. If more than one lesion greater than 5 mm is discovered, the patient should be considered to have MM requiring therapy. In this patient with smoldering MM, negative findings on whole-body low-dose CT scan does not exclude skeletal lesions, and MRI is needed for further evaluation
500

A 58-year-old man is evaluated at a follow-up visit. He has had rheumatoid arthritis for 5 years. Increasing morning stiffness, fatigue, increasing joint pain, and swelling of small hand joints have developed in the past 6 months. His disease activity score shows moderate activity. He also has coronary artery disease, COPD, and a history of diverticulitis. Current medications are aspirin, lisinopril, metoprolol, a tiotropium inhaler, methotrexate, and sulfasalazine.

On physical examination, blood pressure is 136/84 mm Hg. BMI is 29. Multiple metacarpophalangeal joints are tender to palpation, and there is active synovitis.

Result of an interferon-gamma release assay is negative.

Hand radiographs show joint-space narrowing and three new erosions

Which of the following is the most appropriate treatment?

Abatacept

Adalimumab

Anakinra

Tocilizumab

Tofacitinib

Adalimumab

500

A 78-year-old woman is evaluated 4 months after placement of a drug-eluting stent for treatment of chronic stable angina pectoris. She is asymptomatic. She has hypertension, gastroesophageal reflux disease, and a history of several colonic angiodysplasias treated with electrocoagulation 8 months ago. Medications are pravastatin, aspirin, clopidogrel, metoprolol, hydrochlorothiazide, ferrous sulfate, and omeprazole.

On physical examination, blood pressure is 132/72 mm Hg, pulse rate is 78/min, and respiration rate is 20/min. BMI is 17. Scattered ecchymoses are evident over both lower extremities.

Results of laboratory studies show a hematocrit  of 34%.

Which of the following is the most appropriate initial management?

Assess platelet reactivity

Discontinue aspirin and clopidogrel

Discontinue clopidogrel

Discontinue omeprazole

Discontinue Clopidogrel 

500

A 56-year-old man is evaluated for right-upper-quadrant abdominal pain of several months' duration. He otherwise has been well. He does not drink alcohol, has not been exposed to other hepatotoxins, and takes no medications.

On physical examination, vital signs are normal. Abdominal examination reveals hepatosplenomegaly. The remainder of the physical examination is normal

Laboratory studies:

Platelet count -109,000/μL (109 × 109/L)

Alkaline phosphatase -450 U/L

Alanine aminotransferase -105 U/L

Aspartate aminotransferase -103 U/L

Chest radiograph shows bilateral hilar lymphadenopathy. Result of an interferon-γ release assay is negative.

Abdominal ultrasound shows a slightly enlarged, mildly nodular liver, with normal bile ducts. Spleen is 14 cm in length. Liver biopsy reveals changes of non-necrotizing hepatic granulomas without hepatic fibrosis.

Culture results of liver biopsy specimens are negative for fungal, Brucella, and Coxiella burnetii infections

Which of the following is the most appropriate diagnostic test to perform next?

CT of abdomen

Hepatobiliary iminodiacetic acid scintigraphy

Magnetic resonance cholangiopancreatography

Upper endoscopy

Upper endoscopy

500

A 25-year-old man is evaluated in the emergency department for worsening shortness of breath and right-side pleuritic chest pain, which developed 1 hour ago. He has an 8-pack-year history of smoking cigarettes. His medical history is otherwise unremarkable, including the absence of lung disease. He is a professional scuba diver.

On physical examination, blood pressure is 150/70 mm Hg, pulse rate is 105/min, and respiration rate is 30/min. Oxygen saturation  is 92% with the patient breathing ambient air. There are decreased breath sounds, reduced expansion, and hyperresonance to percussion on the right side.

Chest radiograph reveals a large right pneumothorax and no signs of tension.

Smoking cessation counseling and an offer of varenicline are planned at the time of discharge.

Which of the following is the most appropriate additional pneumothorax management?

Catheter thoracostomy followed by pleurodesis

Needle aspiration

Observation

Supplemental oxygen and observation

Catheter thoracostomy followed by pleurodesis

  • Recurrence prevention is recommended after the second episode of pneumothorax on the ipsilateral side in primary spontaneous pneumothorax and after the first occurrence in secondary spontaneous pneumothorax.
  • Recurrence prevention is indicated following a first episode of pneumothorax in spontaneous primary pneumothorax in a patient with a high-risk occupation
500

A 78-year-old man is hospitalized with dyspnea, light-headedness, palpitations, and intermittent chest pain progressing over the past 7 days. Medical history is notable for atherosclerotic cardiovascular disease, hypertension, and hyperlipidemia. Medications are lisinopril, atorvastatin, metoprolol, and aspirin.

On physical examination, blood pressure is 91/53 mm Hg and pulse rate is 107/min; oxygen saturation  is 93% breathing ambient air. Conjunctivae are pale. The remainder of the examination is normal.

Laboratory studies:

Haptoglobin 

<10 mg/dL (100 mg/L)

Hemoglobin 

6.7 g/dL (67 g/L)

Leukocyte count 

9500/μL (9.5 × 109/L)

Platelet count 

315,000/μL (315 × 109/L)

Reticulocyte count

11% of erythrocytes

A direct antiglobulin test is strongly positive for anti-IgG and weakly reactive for anticomplement. The blood bank reports all available units are incompatible.

Which of the following is the most appropriate immediate treatment?

Combination prednisone plus rituximab

Erythrocyte transfusion

Emergent splenectomy

Methylprednisolone

Rituximab

Erythrocyte transfusion

  • The autoantibody in warm autoimmune hemolytic anemia obscures detection of alloantibodies, complicating identification of compatible donors.
  • Transfusion of type-specific blood that is otherwise incompatible may be required in patients with warm autoimmune hemolytic anemia with severe anemia, symptoms, or significant comorbidities
  • The most pressing initial intervention should address patient stabilization, which may require transfusion in those with severe anemia (hemoglobin <7 g/dL [70 g/L]), hemodynamic instability, or significant comorbidities such as cardiopulmonary disease; this patient has all of these complications. The autoantibodies are typically IgG, and some subtypes may fix complement. These autoantibodies are often directed against a core erythrocyte antigen component that is present, as well, on almost all donor erythrocytes, making them all crossmatch incompatible. Therefore, if crossmatch-compatible units cannot be identified, type-specific blood should be slowly transfused and the patient closely monitored