A 43 year-old female with no reported medical history presents with shortness of breath. She notes 2 months of gradually worsening symptoms associated with unproductive cough and intermittent subjective fevers. Symptoms are worsened with activity and when laying flat. She has no history of similar symptoms in the past.

Vital signs are notable for tachycardia, tachypnea and hypoxia. Examination demonstrates absent breath sounds in the entire right lung field. A plain chest radiograph is obtained and shown below. The patient was placed on non-invasive positive pressure with minimal improvement and an emergent therapeutic thoracentesis was performed. Pleural fluid was exudative and a large volume was submitted for cytology.

Whiteout right lung field

An Algorithm for the Analysis of Pleural Fluid

References

1. Light RW, Girard WM, Jenkinson SG, George RB. Parapneumonic effusions. Am J Med. 1980;69(4):507-512.
2. Heffner JE, Brown LK, Barbieri CA. Diagnostic value of tests that discriminate between exudative and transudative pleural effusions. Primary Study Investigators. Chest. 1997;111(4):970-980. doi:10.1378/chest.111.4.970.
3. Romero S, Martinez A, Hernandez L, et al. Light’s criteria revisited: consistency and comparison with new proposed alternative criteria for separating pleural transudates from exudates. Respiration. 2000;67(1):18-23. doi:10.1159/000029457.
4. Light RW. Clinical practice. Pleural effusion. N Engl J Med. 2002;346(25):1971-1977. doi:10.1056/NEJMcp010731.
5. Sahn SA, Huggins JT, San Jose E, Alvarez-Dobano JM, Valdes L. The Art of Pleural Fluid Analysis. Clinical Pulmonary Medicine. 2013;20(2):77-96. doi:10.1097/CPM.0b013e318285ba37.
6. Light RW. The Light criteria: the beginning and why they are useful 40 years later. Clinics in Chest Medicine. 2013;34(1):21-26. doi:10.1016/j.ccm.2012.11.006.
7. Aggarwal AN, Agarwal R, Sehgal IS, Dhooria S, Behera D. Meta-analysis of Indian studies evaluating adenosine deaminase for diagnosing tuberculous pleural effusion. Int J Tuberc Lung Dis. 2016;20(10):1386-1391. doi:10.5588/ijtld.16.0298.

The post Pleural Fluid appeared first on Differential Diagnosis of.

64F with a history of CAD, MI, CHF, CLL and rheumatoid arthritis who presented to the emergency department after transfer from a rehabilitation facility for respiratory distress. The patient reported several days of progressive shortness of breath with dyspnea on exertion. She also noted some associated orthopnea and lower extremity edema. The patient was recently hospitalized for similar symptoms and was diagnosed with CHF at the time. At the rehab facility, the patient became hypoxemic and hypertensive, reporting shortness of breath and chest pain prior to presentation.

Hospital Course:

The patient was initially managed with BiPAP and nitroglycerin continuous infusion, but was then stable on supplemental O2 via nasal cannula and was transitioned to long-acting nitrates and anti-hypertensives. The patient’s hypoxemic respiratory failure was initially attributed to acute exacerbation of left-ventricular heart failure, and the patient was managed with spot diuresis. However, there was no symptomatic improvement and the patient became hypernatremic so diuresis was held as alternative diagnoses were explored.

A transthoracic echocardiogram showed preserved LVEF (50-55%), but some diastolic dysfunction and elevated PAP/RAP. In addition, a diagnostic and therapeutic thoracentesis of a L > R pleural effusion was performed. Pleural fluid studies were suggestive of a transudative process, though with some abnormal characteristics (including lymphocyte predominance, as well as presence of signet cells).

Rheumatology and pulmonology services were consulted for input and recommendations for further evaluation were appreciated. Per rheumatology, the patient’s diagnosis of rheumatoid arthritis may not be consistent with her presentation or prior serologic studies. Her pleural fluid analysis was also not consistent with rheumatoid disease. According to pulmonary consult, the patient’s hypoxemia remains most consistent with left ventricular dysfunction though primary pulmonary processes cannot be excluded (and would warrant further evaluation with imaging and pulmonary function testing).

Physical Exam:

Labs/Studies:

• CBC: 11.2/10.2/32.7/179
• BMP: 141/3.9/103/30/15/0.85/107
• INR: 0.9
• BNP: 1857
• UA: WBC 4, RBC 29 , +Bacteria, UCr 90, UPr 14
• Rheum: CCP <16, ANCA neg, RF 936
• Pleural Fluid: LDH 98 (serum 237), Protein 2.8 (serum 6.0), Glucose 107
• Cytology: Reactive mesothelial cells, histiocytes, lymphocytes, signet cells

Imaging

CXR

There is a large left pleural effusion obscuring the lower half of the left hemi thorax. The cardiac silhouette is also obscured. There is pulmonary venous vascular congestion. There is also a right pleural effusion with fluid tracking into the minor fissure. Pulmonary interstitial edema is also noted.

CT Chest (High-Resolution):

• Bilateral, left greater than right, pleural effusions with adjacent atelectasis and collapse versus consolidation of the left lower lobe.
• Prominent main pulmonary artery measuring 3.3 cm in diameter, which can be seen with pulmonary arterial hypertension.

TTE:

• LVEF is 50-55%.
• Impaired left ventricular relaxation, which is associated with grade I/IV or mild diastolic dysfunction.
• Moderate aortic stenosis with mild regurgitation (AVA 1.4 cm3, mean gradient 14mmHg, peak velocity 2.4 m/s).
• Severe pulmonary hypertension (est PASP 52-62mmHg).
• The inferior vena cava appeared dilated and decreased <50% with respiration (RAP 10-20 mmHg).
• Minimal pericardial effusion without echocardiographic evidence of tamponade.

Assessment/Plan:

64F with history of CAD (prior MI), CHF, hypertension, CLL, hypothyroidism presented from a SNF with progressive shortness of breath, orthopnea and LE swelling, found to have bilateral (L>R) pleural effusion now s/p thoracentesis with transudative fluid.

#Acute hypoxic respiratory failure: Large pleural effusions, s/p thoracentesis with pleural fluid suggestive of transudative process. Most likely secondary to left ventricular diastolic dysfunction. Improved after thoracentesis and diuresis. High-resolution CT chest performed without evidence of autoimmune-related pulmonary fibrosis or ILD (though persistent pleural effusions, pulmonary vascular congestion).

#Pleural fluid signet cells: Identified on cytology, potentially related to history of untreated CLL or alternative primary malignancy.

#Left ventricular diastolic dysfunction, decompensated: Associated with pleural effusions and hypoxemic respiratory failure. Management with diuresis.

#Pulmonary Hypertension: Severe, noted on transthoracic echocardiography, may be secondary to hypoxemia associated with pleural effusions, consider repeat imaging once euvolemic or right-heart catheterization.

#Microscopic Hematuria: No evidence of infection, no symptoms suggestive of nephrolithiasis. No casts identified or significant proteinuria. Plan for renal ultrasound.

#Rheumatoid Arthritis: History of rheumatoid arthritis, on prednisone and hydroxychloroquine. Imaging without evidence of inflammatory arthropathy, RF elevated but CCP negative. Per rheumatology, the patient’s symptoms are not consistent with RA, continuing home medications while evaluation is ongoing. Pleural effusions unlikely associated with RA as transudative, and without monocyte predominance or low glucose.

Case 2: Malignant Pleural Effusion

• Protein: 2.6 (serum: 4.9)
• LDH: 1275 (serum: 219)
• Cytology: Malignant cells

Case 3: Traumatic Thoracentesis

• Protein: 2.7 (serum 6.4)
• LDH: 344 (serum 236)
• Cell count: 100,000 RBC

Case 4: Pneumonia

• Protein: 4.3 (serum 6.7)
• LDH: 377 (serum 108)
• pH: 7.46
• Glucose: 153
• Neutrophils: 84%

Etiology of Pleural Effusions: ¹

Clinical Features in the Diagnosis of Pleural Effusions and Identifying Etiology: ^1,2

Pleural effusions can be easily identified on chest radiography, physical examination findings include dullness to percussion, decreased tactile fremitus and decreased (or absent) breath sounds.

• Hemoptysis: Malignancy, PE, TB
• Weight Loss: Malignancy, TB
• Ascites: Cirrhosis, ovarian cancer
• Unilateral Leg Swelling: PE
• Bilateral Leg Swelling: CHF, cirrhosis, nephrotic syndrome
• Jugular Venous Distension: CHF

Differential Diagnosis of Pleural Effusions: ^1,2,3,4

References:

1. Light, R. W. (2002). Clinical practice. Pleural effusion. The New England journal of medicine, 346(25), 1971–1977. doi:10.1056/NEJMcp010731
2. McGrath, E. E., & Anderson, P. B. (2011). Diagnosis of pleural effusion: a systematic approach. American journal of critical care : an official publication, American Association of Critical-Care Nurses, 20(2), 119–27– quiz 128. doi:10.4037/ajcc2011685
3. Thomsen, T. W., DeLaPena, J., & Setnik, G. S. (2006). Videos in clinical medicine. Thoracentesis. The New England journal of medicine (Vol. 355, p. e16). doi:10.1056/NEJMvcm053812
4. Wilcox, M. E., Chong, C. A. K. Y., Stanbrook, M. B., Tricco, A. C., Wong, C., & Straus, S. E. (2014). Does this patient have an exudative pleural effusion? The Rational Clinical Examination systematic review. JAMA : the journal of the American Medical Association, 311(23), 2422–2431. doi:10.1001/jama.2014.5552
5. WikEM: Pleural effusion

The post Pleural Effusion appeared first on Differential Diagnosis of.