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CHAPTER 5 Transbronchial Cryobiopsy for Diffuse Lung Diseases
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37
4. Pumnary funtin tests: Dlco shud be >35%,
fred vita apaity (FVC) > 50%, and tta ung
4
apaity (TLC) > 50% prediated.
A Dlco f <35%
inreases the prbabiity f adverse utmes and
mrtaity at 30 and 90 days.
5. Hypxia: Pao
> 55–60 r an Spo
2
13
> 90% whie n 2 L
2
f xygen via nasa annua is nsidered a requirement by sme, whie thers nsider any use f suppement xygen a ntraindiatin. Intrapredura
tehniques t assess the patient’s abiity t safey terate transient peribipsy hypxia are detaied ater.
4,14
6. Obesity: ere shud be n signiant abdmina
2
besity. A BMI <35–40 kg/m
is nsidered by sme
t be a reasnabe ut- vaue. Signiant abdmina besity may make it diut t mpete the predure due t the rapid devepment f ateetasis
and inreased risk f peripredura hypxemia.
7. Pumnary hypertensin: A transthrai ehardigram is usuay suient and is remmended t
btain befre the predure as many patients with
DPLD may have existent pumnary arteria hypertensin. Pumnary artery systi pressure ess than
50mmHg with nrma right ventriuar funtin is
8,9,15
remmended.
marker t exude signiant pumnary hypertensin.
Sme enters use BNP as a surrgate
16
8. Cmrbid media nditins: Unntred hypertensin, ngestive heart faiure, ishemi heart
disease, ESRD n diaysis, severe arti stensis,
signiant entribuar emphysema r buus ung
disease in the area f bipsy, and thrmbembi
disease unabe t stp antiaguatin r with signifiant right heart dysfuntin are nsidered ntraindiatins t TBCB.
4
Equipment
1. 1.9 mm r 2.4 ERBE ryprbe (ERBE, Marietta,
GA, USA)
2. ERBE ry mahine with CO
3. Fexibe brnhspe with minimum 2.8-mm
wrking hanne fr 2.4-mm prbe (arger wrking
hanne remmended fr greater sutin apaity
if nt using rigid brnhspy)
4. Rigid brnhspe (peratr dependent)
5. Rigid sutin atheter (peratr dependent)
6. Brnhia bker (Arndt r Fgarty ban; Arndt
7 r 9 Frenh; the ban shud be arge enugh
that, when inated, it bstruts the segmenta r
mainstem brnhi prxima t the site f the bipsy)
r N
2
O gas
2
7. Endtrahea tube (standard r wire-reinfred)
8. C-arm urspy mahine
9. Basin with nrma saine
10. Frmain speimen etin ntainers
11. Ied saine r ther vasnstritr agent
Staff
1. Brnhspist
2. Send brnhspist r trained brnhspy
tehniian t assist with prphyati ban
inatin
3. Brnhspy tehniian t assist with speimen
etin
4. Anesthesia prvider
5. Brnhspy nurse t administer sedative mediatins and mnitr the patient, if required
Setting
Latin suitabe fr genera anesthesia (brnhspy
suite r peratr rm).
PROCEDURAL TECHNIQUES
Flexible Bronchoscopy Approach
• Anesthesia, ventilation, and airway
Genera anesthesia, with r withut neurmusuar bkade with paement f an ETT, prvides a
seure airway in the event f massive airway hemrrhage. By eiminating the ugh reex, risk f mapsitin f the ryprbe during the predure with the
unintended nsequene f mving the prbe either
t far int the periphery r t prxima in the hest
is redued. Psitive end-expiratry pressure shud
be kept at a minimum (maximum 5 mH
One f the benets f using an ETT is the apprpriate paement f an endbrnhia ban
bker. ere are tw methds fr paement f
the endbrnhia bker in reatin t the ETT:
(1) within the ETT r (2) externa t the ETT. If the
endbrnhia bker is passed within the ETT, the
patient is rst intubated in the standard manner. An
Arndt endbrnhia bker is passed thrugh the
ETT nnetr and seured t the tip f the exibe
brnhspe. e nnetr with the endbrnhia bker attahed t the brnhspe is then
attahed t the ETT and the ban bker is guided
thrugh the ETT and psitined prxima t the
O).
2

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Fig. 5.2 Placement of Arndt endobronchial balloon
blocker. The Arndt balloon blocker kit comes with an
endotracheal tube (ETT) connector (yellow star) that
attaches to the ETT. The endobronchial balloon blocker
is passed through the connector (blue arrow) and meets
the bronchoscope that was passed through the connector (red arrow). The blocker is secured to the tip of the
bronchoscope (yellow arrow). The entire apparatus is
then attached to the ETT.
SECTION 1 Advanced Diagnostic Bronchoscopy Procedures
airway segments being bipsied (Figs. 5.2 and 5.3).
One ptentia imitatin t this apprah is that the
ban may ause partia bstrutin f the ETT and
impair remva f the brnhspe and ryprbe
fwing bipsy, raising the risk f ban disdgement. Aternativey, the endbrnhia bker may
be externa t the ETT. With this methd, the patient
is berptiay intubated (either awake berpti
intubatin, fwed by tta intravenus anesthesia
[TIVA] ne the tube has been seured r berpti
intubatin fwing indutin with anesthesia) with
an Arndt endbrnhia bker psitined “piggybak” angside the ETT (Fig.5.4). is aws ease f
paement f the ban bker at time f anesthesia
indutin withut bstruting the ETT (Fig. 5.5).
18
One ptentia advantage f the ETT with an externa
bker tehnique is the abiity t seetivey intubate
the ntraatera ung in the setting f severe hemrrhage whie eaving the ban in pae n the
beeding side. If the ban is paed in the umen f
the ETT, the ban wud have t be deated and
retrated in rder t pass the ETT int the ntraatera mainstem brnhi. A exibe spira, wire-reinfred ETT (Fig. 5.6) is usefu in these irumstanes
and faiitates easy insertin int the mre anguated
A B
Fig. 5.3 Position of the bronchial blocker in the bronchus intermedius. (A) Correct positioning
of the bronchial blocker in the bronchus intermedius. Right middle lobe (white arrow), superior
segment (black arrow), remaining right lower lobe segments (red arrow). (B) Fully inated bal-
loon occluding all segments. This is a test ination for (1) balloon integrity and (2) assessment
of patient’s physiologic response to balloon occlusion. If the patient becomes hypoxic with this
maneuver, the procedure is aborted.

CHAPTER 5 Transbronchial Cryobiopsy for Diffuse Lung Diseases
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A
B C
Fig. 5.4 Conguration of bronchial blocker external to the tube. (A) The bronchial blocker secured
at the distal end of the bronchoscope. (B) Endotracheal tube loaded on bronchoscope and secured
with tape. (C) Bronchial blocker attached to suction apparatus on bronchoscope with hemostat.
Hemostat maintains cinch attachment of blocker to bronchoscope.
39
A B
Fig. 5.5 Bronchial blocker positioned external to the endotracheal tube. (A) Patient intubated with
endotracheal tube. Bronchial blocker is passing external to the endotracheal tube (black arrow).
Syringe attached to blocker to inate the balloon (white arrow). (B) Bronchoscopic view of distal
end of endotracheal tube. Yellow bronchial blocker catheter is passing external to the endotracheal
tube and is directed into the right mainstem.

40
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Fig. 5.6 Spiral wire reinforced endotracheal tube. An
8.5-mm internal diameter endotracheal tube.
SECTION 1 Advanced Diagnostic Bronchoscopy Procedures
e mainstem brnhus if bipsies are taken in the
right ung and massive beeding is enuntered.
• Use of prophylactic balloon blocker and bleeding
prevention
Beeding is a majr nern with this predure and
preventin and expertise in ntring airway hemrrhage is f primary imprtane. One apprpriate patient seetin has been dne and the airway
seured with either an ETT r rigid brnhspe,
the prphyati endbrnhia bker is psitined
prxima t the segment t be bipsied (Fig. 5.3). e
use f a brnhia bker (Arndt r Fgarty ban)
is nsidered mandatry by guideines. Beause the
arge size f the bipsy speimens requires the brnhspe and ryprbe t be remved en b aer
a bipsy is taken, the airway remains unprteted
and withut a brnhia bker in the airway at the
start f the predure, vauabe sends are st as
bd rapidy s the anatmi dead spae with risk
f asphyxiatin and death. It is imprtant t test the
ban prir t airway insertin t detet defets
that wud prevent prper ban usin during
the predure. One the ban is in psitin, a
test inatin shud be perfrmed t determine the
patient’s physigi respnse t ban usin. If
the patient bemes hypxi during the test inatin,
the predure shud be abrted. One the bipsy is
taken, the ban is then immediatey inated by a
send brnhspist r trained assistant. Aer the
bipsy is transferred t a saine basin, the brnhspe is rapidy reinserted int the airway and the
ban is deated aer the spe is psitined in
frnt f the inated ban (Fig. 5.7). e speimen
is then transferred frm the saine basin t the xative f hie, typiay frmain. Mid-t-mderate
beeding an then be ntred with sutin, spe
tampnade, r ied saine at the disretin f the
brnhspist. If beeding is severe and ntinues
with these measures, then the ban is reinated
t tampnade the beeding and prevent siing f
additina airways. is tehnique was riginay
desribed with rigid brnhspy but then was
adpted t aw paement f the ban externa t
the ETT as desribed earier.
18,19
e appiatin f urspy is essentia t ensure
that bipsies are taken as se t the peura as pssibe t ensure representative samping f diseased
ung parenhyma (within 1m f the peura is remmended) whie as making sure that the prbe is
nt t prxima s as t avid arge bd vesses and
ause severe beeding. Withut the use f urspy,
the sti ryprbe may beme dged mre prximay than reaized due t distrted airways r airway
bifuratins if the brnhspist sey reies n tatie
feedbak. Sme degree f beeding shud be expeted
with TBCB but the use f urspy may hep mitigate this risk. Reprts f severe beeding have urred
in situatins in whih urspy was nt empyed.
e use f radia endbrnhia utrasund (rEBUS)
has been suggested as a means t redue beeding by
identifying vesses and thus direted the ryprbe t
ung tissue devid f vasuature. Currenty the data
are niting n its use in reduing beeding and this
remains an area f ative investigatin.
21,22
• Cryoprobe size and freezing time
One the airway has been seured and the prphyati ban bker has been rrety psitined,
the ryprbe is advaned int the segment f hie
under urspi guidane. e size f ryprbe
used (1.9mm vs. 2.4mm) is peratr dependent but
there may be a higher risk f pneumthrax with the
23
2.4-mm prbe.
N signiant dierenes in diagnsti yied have been identied. Current guideines remmend use f the 1.9-mm prbe fr this reasn.
smaer size may prvide easier tatie feedbak when
the prbe makes ntat with the peura.
e size f the sampe wi depend n the surfae
area f the prbe and the duratin f prbe ativatin. As a genera rue, the nger the ativatin time,
9
e
20

CHAPTER 5 Transbronchial Cryobiopsy for Diffuse Lung Diseases
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A B
Fig. 5.7 Prophylactic bronchial blocker inated immediately after biopsy. (A) Fully inated bron-
chial blocker immediately after biopsy was taken from the right lower lobe. (B) Balloon is deated
once the bronchoscope is repositioned in the airway and careful inspection can be performed.
Suctioning, scope tamponade, administration of vasoconstrictor agents, or immediate reination
of the balloon can be performed for bleeding control if needed.
41
A B
Fig. 5.8 Test freezing the cryoprobe. (A) Test freezing the cryoprobe. (B) Freeze ball should be
approximately 5mm in size. Freezing times vary to achieve this size.
the greater the sampe size. Mst freezing times are
between 4 and 7 s with wide ranges f tissue sampe
sizes (9–64.2 mm).
An en frgtten but imprtant step befre the
rst bipsy is taken is t test the time it takes fr the
prbe t generate a 5-mm ie ba (Fig. 5.8). Beause
the pressure f the gas (CO
direty impats the rapidity with whih the tip f
the prbe freezes, it is nt unmmn fr a fu CO
2
tank t frm a arge ie ba within 3–4 s. If the prbe
7
freeze time is up t 7s in this situatin, a substantiay
arger speimen than antiipated may be btained,
inreasing risk f mpiatins.
• Cryoprobe distance to pleura
r N
2
O) in the yinder
2
One the patient has a seure airway, the prphyati ban bker is in pae, and the urspy

42
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SECTION 1 Advanced Diagnostic Bronchoscopy Procedures
C-arm is in psitin, the ryprbe is advaned
thrugh the wrking hanne f the therapeuti
brnhspe, int the target segment and direted
se t the edge f the peura under urspi
guidane. e ptima distane between the prbe
and the peura is essentia fr bth safety and diagnsti yied, as sampes <1 m frm the peura signianty inrease pneumthrax rates apprahing
19,23,24
30%.
Adjusting the ryprbe within 2m f
the peura has the added advantage f samping
sma airways and with ptentia gd suess in
25
diagnsing nstritive brnhiitis.
e ptima distane f ryprbe that is urrenty remmended is 1 m frm the peura. Latera airways are
preferabe whenever pssibe t assist with aurate
psitining f the prbe t the peura. Under diret
urspi guidane, the ryprbe shud be
advaned unti resistane is fet (nsidered t be in
ntat with the peura). One the edge f the peura
has been reahed, the prbe is retrated 1 m, whih
an be estimated frm the ength f the metai tip
f the ryprbe, whih measures 1 m (Fig. 5.9).
• Location and number of biopsies
e atin f the bipsy wi vary between patients
and is dependent n the atin and extent f disease
as we as tehnia fatrs in advanement f the ryprbe and psitin f the ban bker. It is remmended that bipsies be taken frm tw dierent sites:
either a dierent segment within the same be r a
dierent ipsiatera be. is paraes vide-assisted
26
thraspi surgery (VATS)-SLB tehnique.
It as
redues hanes f misdiagnsis sine tw dierent
histgi diagnses may be seen in dierent bes.
27,28
It shud be kept in mind that the risk f pneumthrax may inrease if tw dierent sites are hsen.
e number f bipsies per segment r be is nt
standardized and is generay peratr dependent.
Hwever, it is remmended that three t ve bipsies be btained.
8
• Processing and collection of the specimen
e TBCB sampes shud be handed with are t
prevent rush artifat and aw pattern regnitin.
One the bipsy is taken and the spe is remved
frm the airway en b, the ryprbe with the sampe attahed is paed int saine. e bipsy is then
mved genty frm saine and paed int frmain
(Fig. 5.10). e bipsy shud then be embedded and
riented int paran t maximize surfae area n
the sides.
Rigid Bronchoscopy Approach
In genera, the prinipes fr eah mpnent f the predure as detaied earier fr the exibe brnhspy
apprah are the same as fr rigid brnhspy with
the exeptin f sme detais as it reates t ventiatin
and ban bker. e ptentia advantages t the
rigid brnhspy apprah inude the additin f a
arge sutin devie in the event f severe beeding and
A B
Fig. 5.9 Positioning of cryoprobe with uoroscopy. (A) Cryoprobe is advanced until the pleural
edge is reached. (B) The probe is pulled back 1 cm from the pleural edge. This is estimated based
upon the metallic tip of the cryoprobe being 1 cm in length. This is the location where the biopsy
is taken.

CHAPTER 5 Transbronchial Cryobiopsy for Diffuse Lung Diseases
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A B
Fig. 5.10 Collection of cryobiopsy specimen. (A) Transfer of cryobiopsy specimen from saline con-
tainer to formalin with blunt tip needle and syringe. (B) Freshly obtained cryobiopsy specimens.
43
a arge ventiating umen that aws passage f a therapeuti brnhspe, endbrnhia brnhia bker,
and sutin.
• Anesthesia, ventilation, and airway
With the rigid brnhspy apprah, the patient
shud be intubated as per institutina standard
perating predures. Sanders’ jet ventiatin has
mst en been reprted in the iterature as this
aws fr an pen system and permits rapid entry
int and ut f the airway, whih is ritia with
this predure. Sedatin is ahieved with TIVA
and administratin f paraytis. It is imprtant
t aw fr adequate exhaatin time in rder t
prevent aumuatin f psitive pressure, thus
inreasing the risk fr pneumthrax. Bipsies
shud be taken between breaths if pssibe t
redue this risk as we. If nventina ventiatin is used with rigid brnhspy, then the
same ventiatry prinipes appy as fr exibe
brnhspy.
• Use of prophylactic balloon blocker and bleeding
prevention
A prphyati ban bker is sti required with
rigid brnhspy. An endbrnhia ban
bker an be passed dwn the umen f the rigid
spe and psitined prxima t the segment t be
bipsied. e same predures fr test inatin and
ban inatin pstbipsy are the same as detaied
earier.
• Performing biopsies
e ryprbe is tested fr the exat freeze time
t ahieve a 5-mm ie ba. e ryprbe is then
advaned thrugh the umen f a therapeuti exibe
brnhspe. e exibe spe is then advaned
thrugh the rigid brnhspe and t the segment
t be bipsied. e rybipsies are perfrmed under
urspi guidane and the exibe spe with the
ryprbe and speimen is remved en b thrugh
the rigid brnhspe. e speimen is freed frm
the ryprbe in saine and then transferred t frmain. e exibe brnhspe is then passed
thrugh the rigid brnhspe, paed immediatey
in frnt f the inated ban, and then the ban
is deated and evidene fr beeding is bserved.
Beeding may then be ntred with sutin, exibe spe tampnade, r reinatin f the ban if
beeding is brisk.
COMPLICATIONS
e safety f rybipsy has been a ntentius issue
with high reprts f mpiatin rates seen in situatins

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SECTION 1 Advanced Diagnostic Bronchoscopy Procedures
in whih the predure was nt standardized. With the
intrdutin f guideine statements undersring key
eements t standardize the tehnique t imprve safety,
this shud beme ess f a hindrane t perfrming
the predure.
In tta, mpiatins ur in rughy 25% f ases,
with the mst mmn being beeding and pneumth-
29
rax (Tabe 5.2).
Sme degree f beeding is expeted
with TBCB and ak f a unifrm beeding severity sre,
dierenes in perfrming the predure, and dierenes
in size f the ryprbe used have made it prbemati
in determining its preise prevaene and assiated
risk fatrs. Mderate beeding, as dened by ntr f
beeding with endbrnhia bker r administratin
f ied saine, urs in apprximatey 9%–14% f subjets; severe beeding (hemdynami mprmise, ICU
admissin, surgia interventin, r ative tampnade
9,29
interventins) has an inidene f 1%.
Severe beeding is fet t be mre ikey when bipsies are taken in
the entra znes due t the size f adjaent brnhia
arteries. Frm a pratia standpint, hwever, it an be
diut t determine the exat atin f the ryprbe
in the hemithrax n a tw-dimensina (2D) urspy C-arm depending n the be and segment being
bipsied and the rientatin f the C-arm t the thrax.
Pneumthrax urs in 9% f patients. e rate
appears t be reated t (1) the number f sampes
taken, (2) prximity f the prbe t the peura, (3) use f
a 1.9-mm r 2.4-mm ryprbe, (4) UIP pattern n histpathgy, (5) brti retiuatin n HRCT, and (6)
whether the bipsy was in the upper r wer bes. e
2.4-mm prbe, mre than ne bipsy site, and bipsy
f the wer bes is assiated with a higher pneum-
23
thrax rate.
Chest tube paement is mmn in these
situatins (70%).
Exaerbatin f underying interstitia ung disease
(ILD) urs in 0.3% f TBCB and is prbaby mre
prevaent in individuas wh are hspitaized due t an
13,24
exaerbatin f their ILD.
is rate remains wer
than fr SLB (3%).
e vera predura mrtaity rate has been nsistenty reprted ess than 1% with ped rates vary-
5,29–32
ing between 0.3% and 0.5%.
e 30- and 90-day
mrtaity rate may apprah 2.0%, with at-risk individuas being thse wh are hspitaized and/r had a
wrsening f their disease befre bipsy, severe intrapredura hemrrhage, and a Dlco f ess than 35%.
13
With gd patient seetin, this mrtaity rate shud
imprve.
Rare mpiatins inude avitary absess, pneum-
mediastinum, brnhia aeratin, and seizures.
24,33–35
TABLE 5.2 Complications of
Transbronchial Cryobiopsy
Complication Rate
Moderate bleeding 9%
Severe bleeding 1%
Pneumothorax 9.4%
Exacerbation of IPF 0.3%
Prolonged air leak 0.3%
Transient respiratory failure 0.7%
Seizures 0.7%
Pneumomediastinum One case reported
Cavitary abscess Three cases reported
Bronchial laceration One case reported
Death 0.5%
a
Highly variable and dependent on bleeding classication
used; one meta-analysis found rate of combined moderate
and severe bleeding of 14%.
IPF, Idiopathic pulmonary brosis.
29
a
a
EVIDENCE
Overall Pooled Diagnostic Yield of
Transbronchial Cryobiopsy
Diagnsti yied is variabe between studies ranging
frm 44% t 90% and is dependent n whether diagnsis was nrmed by histpathgy r MDD.
genera, the ped diagnsti yied is 72%.
tributin f the MDD annt be verstated as denite
diagnsis may imprve by as muh as 24% when input
frm an MDD is nsidered (e.g., 44% t 68%).
ritia as the MDD (with a inia, radigraphi, and
pathgi data) remains the gd standard fr diagnsis
and, nt infrequenty, the histpathgi diagnsis may
dier frm the na MDD diagnsis.
Transbronchial Cryobiopsy Versus
Transbronchial Biopsy
Cnventina TBBx has a pr histpathgi nrdane with SLB and a reativey w diagnsti yied
23,36
29
e n-
36
is is
In

CHAPTER 5 Transbronchial Cryobiopsy for Diffuse Lung Diseases
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1,37–39
(36%) in DPLD.
In the ny randmized tria mparing TBCB t TBBx, mre histpathgi diagnses
were made in the TBCB grup than in the TBBx grup
14
(74.4% vs. 34.1%, P < 0.001).
mmended in the diagnsis f IPF.
As suh, TBBx is nt re-
1
Tissue speimens
were signianty arger with TBCB (mean area size
f 14.7 [±11 mm
2
] vs. 3.3 ± 4.1 mm
2
, P < 0.001). is
arger speimen size with TBCB has been nsistenty
reprted arss the iterature (Fig. 5.1).
Transbronchial Cryobiopsy Versus SLB
e best data t date mparing TBCB t SLB me
frm a study f 65 patients wh were deemed by an
MDD t need a tissue sampe and wh underwent
TBCB f tw dierent bes fwed by VATS-SLB
bipsy f the same bes during the same anesthesia.
ree pathgists were binded t the aquisitin f the
speimens and they were anayzed randmy in a nnsequentia manner (a tta f 130 sides). ey were then
disussed by an expert MDD, with a members binded
tward the type f bipsy. ey reprted a raw histpathgi agreement fr guideine-rened patterns f
70.8% between TBCB and SLB (ƙ = 0.7 [95% CI, 0.55–
0.86]). Fr the na MDD diagnsis, the raw agreement
between the tw methds was 76.9% (ƙ = 0.62 [0.47–
0.78]). Fr thse that were assied as having a highy
ndent r denite diagnsis by MDD, 60% (39/65)
were by TBC and 74% (48/65) by SLB (P = 0.09). Using
MDD as the gd standard, the diagnsis was hanged
frm a w ndene t high ndene/denite in
74% (48/65) and 77% (50/65), P = 0.55 f TBCB and
SLB, respetivey, and msty by hanging frm an
unassiabe diagnsis t a mre spei diagnsis.
Interestingy, neither TBCB nr SLB was abe t prvide
additina diagnsti ariatin in 12% f ases. ese
resuts prvide nvining evidene that the additin f
TBCB data t an MDD mprmised f experts in ILD
prvides as usefu infrmatin as SLB and, assuming the
safety pre and perfrmane f the predure an be
standardized, make TBCB an attrative and reasnabe
rst-ine bipsy tehnique in the evauatin f ILD.
FUTURE DIRECTIONS
Whie TBCB hds prmise as a nnsurgia aternative
in the diagnsis f DPLD, questins remain. Safety f
the predure sti remains a nern and the ak f
predura standardizatin within and arss enters
45
remains a prbem that guideine statements hpe t
mitigate. Optima patient seetin, prbe size, number f segments and bes t bipsy, use f REBUS,
and training mpeteny as remain areas f ative
researh. It is as unknwn what re genmi testing
wi pay in the diagnsti agrithm f UIP/IPF and
the interfae this wi have with bipsy speimens. e
devepment f a rybipsy registry is needed t trak
the utmes f these predures and prvide quaity
and safety feedbak t enters, brnhspists, institutins, and the pubi. In the meantime, it wud be wise
fr interventina pumngists t devep institutina predura prts t ensure maximum diagnsti yied and safety.
4
S U M M A RY
TBCB is a reativey new bipsy tehnique in the diagnsis f DPLD. It prvides usefu histpathgi
infrmatin that an be inrprated int the MDD
disussin t psitivey inuene a denitive diagnsti utme. e diagnsti ntributin f TBCB is
superir t TBBx and is gd when mpared t SLB.
As suh, it remains a gd initia diagnsti predure
in patients with DPLD. e safety pre f TBCB has
been ntentius with severe beeding being the mst
nern. With the institutin f guideine statements
that stress the rutine use f genera anesthesia, ETT r
rigid brnhspy, urspy, and a prphyati ban bker, the safety pre is expeted t inrease.
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