The optimal number of pleural biopsy specimens for a diagnosis of tuberculous pleurisy.

STUDY OBJECTIVES: To determine the optimal number of pleural biopsy (PLBX) specimens for a diagnosis of tuberculous pleurisy. DESIGN: Retrospective review. SETTING: County hospital. METHODS: We reviewed all percutaneous needle biopsy specimens of the parietal pleura in 30 patients who had tuberculous pleurisy. Data are reported as mean+/-SEM and statistical comparisons are done with the Mann-Whitney test. We accepted p<0.05 as statistically significant. RESULTS: The number of biopsy specimens obtained from each patient ranged from 4 to 10 with 1 sample submitted for mycobacterial culture and the rest submitted for histologic study. Sixty percent of patients had pleural cultures positive for Mycobacterium tuberculosis and 80% had diagnostic histology. Overall pleural biopsy sensitivity (histology and culture) for tuberculous pleurisy was 87%. On average, 40.4%+/-4.7% of all PLBX specimens contained pleura. Diagnostic PLBX procedures compared to false-negative procedures produced more tissue specimens (7.1+/-0.3 vs 4.8+/-0.5, p=0.005) containing more pleural specimens (2.4+/-0.2 vs 0.8+/-0.5, p=0.01). If only PLBX procedures yielding more than six tissue specimens (n=18) or more than two pleural specimens (n=12) were analyzed, then the diagnostic sensitivity of PLBX for pleural tuberculosis was 100%. There seemed to be a direct relationship between the sensitivity of PLBX and the number of specimens submitted. CONCLUSIONS: The sensitivity of percutaneous needle biopsy for diagnosis of tuberculous pleurisy is highest when more than six specimens are obtained which, on average, contain more than two specimens of parietal pleura. There are no conclusive data indicating how many tissue specimens to submit for mycobacterial culture, but one specimen seems sufficient.

Diagnostic strategies for Pneumocystis carinii pneumonia.

Pneumocystis carinii is an opportunistic organism that is a common cause of pneumonia in immunocompromised patients. Its life cycle begins when cysts rupture and release sporozoites, which mature into trophozoites that eventually form cysts. The diagnostic methods for P. carinii pneumonia (PCP) have progressed from open lung biopsy to bronchoalveolar lavage (BAL) and induced sputum analysis (ISA). Detection of P. carinii organisms is done with various stains that highlight sporozoites, trophozoites, or the cyst wall. Noninvasive, cost-effective methods to aid in the diagnosis of PCP have been proposed and include chest radiograph analysis, gallium scintigraphy, serum lactate dehydrogenase levels, CD4 lymphocyte counts, pulmonary function tests, arterial blood gas analysis, and exercise hemoglobin oxygen saturation measurements. Some investigators propose empiric treatment of PCP to reduce the number of bronchoscopies performed. Most physicians prefer to make a definitive diagnosis of PCP to ensure appropriate therapy.

A modified Abrams needle biopsy technique.

STUDY OBJECTIVE: To compare the diagnostic sensitivity of a modified Abrams needle pleural biopsy technique (A1) with the standard Abrams (A2) and Cope needle biopsy methods. The modified Abrams pleural biopsy technique consisted of suctioning each tissue sample into a syringe without removing the needle completely from the chest until the completion of the entire procedure. Both the standard Abrams and Cope needle techniques required needle removal from the chest after each pleural biopsy. DESIGN: Retrospective chart analysis. SETTING: Community teaching hospital affiliated with Stanford University. PATIENTS: Forty-seven patients (30 men and 17 women) with a mean age 44.5 years (range, 19 to 81 years) who were referred to a pulmonary consultation service for pleural biopsy. INTERVENTIONS: Two of us (C. M. K. and F. T. K.) used the modified Abrams technique and two of us (W. A. J. and A. C. C.) used the standard Abrams technique. The Cope needle was used as originally described. MEASUREMENTS: We recorded the type of pleural biopsy needle and technique used in each patient. Biopsy specimen diameter and number of tissue samples obtained, final diagnoses, and complications were recorded. RESULTS: The diagnostic sensitivity for tuberculous pleurisy was 82% for the modified Abrams method, 71% for the standard Abrams method, and 88% for the standard Cope technique (p > or = 0.3). There was no difference in size of tissue sample obtained (A1 vs A2), number of biopsies, or complications among the three methods of pleural biopsy. CONCLUSIONS: The modified method of Abrams needle biopsy demonstrates a diagnostic sensitivity for pleural tuberculosis (82%) that is equivalent to that for the standard Abrams or Cope methods.