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. Author manuscript; available in PMC: 2011 Jun 23.
Published in final edited form as: Chest. 2008 Nov 18;135(3):769–777. doi: 10.1378/chest.08-1122

Table 1.

Patients in Each PASS Category*

PASSs Description (Based on VSE or FEES) Patients,
No. (%)
Nonaspirated
   patients
 1 No material entered larynx 33 (34.38)
 2 Material entered laryngeal area above
 the TVCs with no residue
12 (12.50)
 3 Material enters laryngeal area above
 the TVCs and residue remained in
the laryngeal area after the swallow
3 (3.13)
 4 Material contacts TVCs with no
 residue
15 (15.63)
  Total 63 (65.63)
Aspirated
   patients
 5 Material contacts TVCs with visible
 residue
5 (5.21)
 6 Material passes the glottis with no
 subglottic residue
0 (0.00)
 7 Material passes glottis with visible
 subglottic residue despite patient’s
response (spontaneous reflexive
cough, throat clear)
10 (10.41)
 8 Material passes glottis, visible
 subglottic residue in proximal
trachea and absent patient
spontaneous reflexive cough (silent
aspiration)
18 (18.75)
  Total 33 (34.37)
*

TVC = true vocal cord. Description of the PASS and scores for all subjects.