Iron stores and coagulation parameters in patients with
hypoxem' c polycythemia secondary to chronic obstructive
pulmonary disease: The effect of phlebotomies
F r o m t h e R e s p i r a t o r y a n d He m a t o l o g y Di v i s i o n s , U n i v e r s i d a d e F e d e r a l d e S ã o P a u l o / E s c o l a P a u l i s t a t l e M e d i c i n a-S ã o P a u l o , B r a z i l .
T h is s tu d y w a s d e s ig n e d to d e te rm in e th e e ffe c ts o f p h le b o to m y o n iro n b o d y c o n te n ts a n d c o a g u la tio n te s ts o f C O P O p a tie n ts w ith p o 'y c y th e m ia s e c o n d a ry to h y p o x e m ia . S e v e n te e n p a tie n ts w ith C O P O a n d h e m a to c rits h ig h e r th a n 5 4 p e rc e n t (m e a n H c t: 5 7 :t 0 .4 9 p e rc e n t ), w h o h a d n o t re c e iv e d a n ti-in fla m m a to ry o r a n tip la te le t a g g re g a tio n a g e n ts re c e n tly . T h e ir m e a n fo rc e d e x p ira to ry v o lu m e a t 1 s e c o n d (F E V1) w a s 0 .9 2 :t 0 .1 1 L . In te rv e n tio n : B lo o d w o rk w a s c o lle c te d to e v a lu a te th e fo llo w in g : s e ru m iro n a n d fe rritin le v e is , to ta l
iro n b in d in g c a p a c ity , tra n s fe rrin s a tu ra tio n in d e x , fib rin o g e n p la s m a le v e is , a c tiv a te d p a rtia l th ro m b o p la s tin tim e , p la te le t c o u n t, p la te -le t a g g re g a tio n m e a s u re m e n ts , a n d th ro m b o e la s to g ra p h y c o a g u la tio n p a ra m e te rs . T h e b lo o d s a m p le s w e re o b ta in e d b e fo re a n d a b o u t 7 d a y s a fte r th e h e m a to c rit c o rre c tio n b y 3 0 0 -4 0 0 m l p h le b o to m ie s d o n e e v e ry o th e r d a y . T h e m e a n n u m b e r o f p h le b o to m ie s d o n e fo r e a c h p a tie n t w a s 4 .4 . P o s tp h le b o to m y iro n s e ru m le v e is d e c re a s e d fro m 9 0 .1 :t 1 4 .8 to 5 9 .7 :t 9 .9 m g /d l a n d th e fe rritin s e ru m le v e is fro m 1 3 3 .8 :t 3 7 .9 to 7 0 .8 :t 3 2 .7 n g /m l (p < 0 .0 5 ). R e g a rd in g th e c o a g u la tio n s tu d ie s , th e re w e re s ig n ific a n t in c re a s e s in th e p la te le t c o u n t, fro m 2 2 7 ,3 0 0 :t 1 3 ,9 0 0 to 3 1 2 ,5 0 0 :t 3 0 ,2 0 0 p e r m m3, a n d in th e m a x im u m c lo t a m p litu d e (a ) o b ta in e d b y
th ro m b o e la s to g ra p h y ( fro m 5 3 .6 :t 1 .4 p e rc e n t to 6 0 .4 :t 1 .1 p e rc e n t). T h e c o a g u la tio n tim e (k ) o f th e th ro m b o e la s to g ra p h y a ls o d e c re a s e d s ig n ific a n tly , fro m 7 .5 :t 0 .7 m m p re p h le b o to m y to 4 .5 :t 0 .3 m m p o s tp h le b o to m y . A lth o u g h th e c o a g u la tio n c h a n g e s w e re s m a ll a m o u n t, th e o b s e rv e d s ig n ific a n t d e c re a s e in iro n c o n te n ts m a y h a v e im p o rta n t c lin ic a i im p lic a tio n s .
U N IT E R M S : S e c o n d a ry p o ly c y th e m ia ; re p e titiv e p h le b o to m ie s ; iro n d e fic ie n c y ; c o a g u la tio n ; c h ro n ic o b s tru c tiv e p u lm o n a ry d is e a s e
IN T R O D U C T IO N
B
loodlettings,in the care of chronicor phlebotom ies,obstructiveare still adyocatedpulm onarydisease (C O PD ) patients w ith cor pulm onale and
severe secondary polycythem ia.1 Several authors have
show n that hem atocrit (H ct) reductions in hypoxem ic
patients w ith C O PD and polycythem ia are follow ed by
im provem ent in general sym ptom s,2-S m ental activity2-6 and
exercise perform ance.2-4.7.8
A d d re s s fo r c o rre s p o n d e n c e : J o s é A . B. M a rtin e z M O
D is c ip lin a d e P n e u m o lo g ia (L u n g D iv is io n ) U N IF E S P /E P M R u a B o tu c a tu , 7 4 0 - V ila C le m e n tin o
S ã o P a u lo /S P - B ra s il - C E P 0 4 0 2 3 -9 0 0
In a group of patients perform ing exercise studies in
ergom eter, the m axim um w orkload and oxygen
consum ption have increased 31 and 16 percent
respectively, w hen the m ean H tc had decreased from 62
to 50percent,x T hese effects are not secondary to changes
in respiratory m echanics or blood gases.2.4.S.7-10R ather, it
seem s they result from im provem ents in hem odynam ic
conditions related to a better blood viscosity.3.11-13
A lthough a great deal has been published in this field,
no attention has been paid to the potential hem atological
consequences of phlebotom ies. Sim ilarly to w hat happens
w ith blood donors and during the treatm ent of
hem ochrom atosis, repeated phlebotom ies in C O PD
patients could lead to reductions in their iron body
contents.14.1S Iron deficiency states m ay run w ith
decrem ents in w ork perform ance secondary to drops in
M A R T IN E Z , J .A .B .; G U E R R A ,C .C .C ,; N E R Y , L .E . e t a I. - lro n s to re s a n d c o a g u la tio n p a ra m e te rs in p a tie n ts w ith h y p o x e m ic p o ly c y th e m ia s e c o n d a ry to c h ro n ic o b s tru c tiv e p u lm o n a ry d is e a s e : T h e e ffe c t o f p h le b o to m ie s
helT Ioglobin leveIs, and disturbances in m uscular oxidative
m etaboIism .1ó In the case of reductions in iron body
contents actualIy deveIoping in C O P D patients folIow ing
phlebotom ies, the form er could act as lim iting factors for
expected exercise im provem ents.
In addition, polycythem ia is a w elI know n risk factor
for throm bosis,17 and lnany studies. suggest that C O P D
patients have a higher tendency to have throm boem bolic
episodes.IX-20 S O lne studies of throm botic risk in C O P D
have show n an increased tendency tow ards coagulation
w ith altered values in the throlnboelastogram ,
hyperfibrinogem ia and increased platelet aggregation.1x'21-23
T herefore, w e hypothesized that a reduction in H ct leveIs
by phlebotolnies could aIso have a favorable effect on
decreasing s'uch throm botic risk.
T he present study investigates the effects of the H ct
correction by repeated phlebotom ies on paralneters of
hem ostasis and body iron contents in C O P D patients w ith
severe secondary hypoxem ic polycythem ia.
P A T IE N T S A N D M E T H O D S
Patient Selection
S eventeen w ith C O P D and polycythelnia ( H ct 5 4
percent or m ore) patients w ere studied after signing an
inform ed consent form o A ll patients w ere in stable
respiratory conditions, w ithout clinicaI evidence of right or
left ventricular faiIure. T hey had not been under any
antiplatelet or anti-inflam m atory agent for at least the prior
1 0 days, and.during the study period there w ere no changes
in their daily m edications. N one of the patients show ed
clinicaI evidence ofblood loss or w ere using oxygen at that
tim e.
F ollow ing an initiallaboratory evaIuation, phlebotom ies
of 300 to 400 m l w ere perfonned every other day until a
venous H ct value around 4 5 percent w as reached (range: 4 1
-4 8 percent). A second set of laboratory tests w as then
perform ed about 7 days after the last phlebotom y 'session.
Iron Stores Measurements
V enous blood sam ples w ith no anticoagulant w ere
collected from fasting patients in the Inorning. Iron seruln
leveIs and seruln total iron binding capacity (T IB C ) w ere
m easured using a com m ercialIy available kit (Iron R oche@ )
w ith readings m ade w ith a C olelnan 6 /2 0
spectrophotom eter. F erritin serum leveIs w ere also
evaluated by a com m ercially available enzym atic
im m unoassay (F errizY lne T M @ - A bbot L aboratories). T he
transferrin saturation index (T S I) w as calculated as the
percentile ratio betw een serum iron leveIs and T IB C .
Coagulation Studies
C oagulation tests w ere perform ed on 3 .8 percent
sodium citrate venous blood sam ples collected
sim uItaneously w ith the iron blood w ork. T he follow ing
determ inations w ere m ade:
- A ctivated paltial throm boplastin tim e (A P T T ) using
hum an cephalin.24 T he results w ere expressed as the ratio
to the control values for the Iaboratory on that day.
- F ibrinogen plasm a leveIs, assessed by the R
atnoff-M enzie Inethocl.25
- P lateIet count, m ade in an autom atic counter C lay
A dam s m odeI U ltra-F Io.
- P latelet aggregation determ inations by the B orn
lnethod in a C hronolog aggregom eter.2ó T he aggregation
agents A D P in concentrations of 1 m M and 3 m M ,
epinephrine at 1: 1000 dilution, and hU lnan colIagen w ere
used in salnples froln each patient. T he percentage of
aggregated pIatelets w as caIculated at a curve point
corresponding to an interval of 5 m inutes from the initial.
stim ulus for each aggregation agent.
- T hrolnboelastography (T E G ), using a H artert
throlnboelastograph lnade by H elIige. T his test exalnines
the entire bloocl coaguIation process and the interaction
of alI involvecl cO lnponents.27 T he reaction tilne
r,
thecoagulation tim e
k,
and the lnaxil11um cIot alnpIitudea ,
w ere lneasured using a special ruIer on the developed film o
Statistical Methods
A ll data are expressed as the m ean : tstandard error.
T he W iIcoxon test w as used in the statistical analysis for
the nonindependent variables. A . leveI of 5 percent w as
fixed as the litnit for rejection of the null hypothesis.
R E S U L T S
T hirteen m ale and four fem ale patients w ere studiecl.
M ost of theln had severe or 1110derate C O P D w ith arterial
hypoxem ia (T able 1 ).T he m ean H ct fell frol115 7 percent
before phebotolnies to 4 5 percent at the tim e of the final
T a b l e 1 P a t i e n t S u m m a r y
A g e F E V1 F V C / F E V1 P a 0
2 H c t P r e H c t P o s t
N o . G e n d e r y r L %
m m H g % %
1 M 5 3 1 . 1 7 5 0 4 7 5 4 4 5
2 M 4 4 0 . 8 2 3 8 3 9 5 5 4 8
3 M ' 6 0 0 . 7 1 3 5 4 4 5 4 4 4
4 M 6 3 0 . 5 9 3 1 4 9 5 7 4 5
5 M 4 4 0 . 6 5 3 8 4 5 6 0 4 5
6 F 3 6 0 . 4 7 4 7 4 2 5 7 4 1
7 M 5 0 1 . 4 6 5 0 4 6 6 3 4 4
8 F 7 2 0 . 4 8 4 5 3 8 5 6 4 6
9 M 2 8 0 . 5 7 3 6 4 2 5 8 4 7
1 0 M 7 5 1 . 1 9 4 5 4 9 6 0 4 7
1 1 M 6 7 1 . 4 1 6 0 5 3 5 8 4 4
1 2 M 7 0 1 . 6 8 6 0 5 1 5 5 4 5
1 3 F 4 2 0 . 6 5 3 2 4 6 5 6 4 3
1 4 F 6 8 0 . 4 4 3 7 4 9 5 8 4 4
1 5 M 7 0 0 . 6 2 3 5 5 3 5 7 4 6
1 6 M 3 5 1 . 8 8 4 9 5 2 5 5 4 5
1 7 M 6 6 0 . 9 3 2 8 5 9 5 5 4 2
M e a n 5 5 : t 3 . 6 0 . 9 2 : t . 1 1 4 2 : t 2 . 4 4 7 : t 1 . 2 5 7 : t . 4 9 4 5 : t . 4 9
T I B C : s e r u m t o t a l ir o n b in d in g c a p a c it y ; T S I : t r a n s f e r in s a t u r a t io n in d e x o * p < 0 . 0 5
T a b l e 2
I r o n c o n t e n t s m e a s u r e m e n t s ( M e a n : ! :S E ) o b t a i n e d p r e - a n d p o s t p h l e b o t o m y
T h e re w e re s ig n ific a n t d e c re a s e s in th e s e ru n l le v e Is
o f iro n , fe rritin a n d T S I p o s tp h le b o to ln y (T a b le 2 ). T w e lv e
s tu d ie s . T h e s e c o n d s e t o f b lo o d te s ts w e re c o lle c te d 8 .7 : t
1 .3 d a y s a fte r th e Ia s t p h le b o to m y . T h e tim e b e tw e e n b lo o d
c o lle c tio n a n d a c tu a I s a m p le a n a ly s is w a s n o lo n g e r th a n
tw o h o u rs in e v e ry c a s e .
P o s t p h le b o t o m y 5 9 . 7 : t 9 . 9 * 3 9 9 . 9 : t 2 0 . 0
1 6 . 7 : t 3 . 6 * P r e p h le b o t o m y
9 0 . 1 : t 1 4 . 8 3 9 3 . 6 : t 2 7 . 6
2 5 . 4 : t 4 . 9
Coagulation Studies
C o a g u la tio n s tu d ie s o b ta in e d b e fo re a n d a fte r
p h le b o to m ie s a re lis te d in T a b le 3 . A li th e in itia l In e a n
v a lu e s w e re w ith in th e n o rln a l lim its ' o f th e a u th o rs '
la b o ra to ry e x c e p t fo r th e
r
p a ra ln e te r o f th e T E G , v v h ic hw a s s lig h tly in c re a s e d . N o s ig n ific a n t d e c re a s e s w e re s e e n
in th e In e a n A P T T a n d fib rin o g e n le v e Is a fte r
p h le b o to ln ie s . T h e p la te le t c o u n t s ig n ific a n tly in c re a s e d
fro n l 2 2 7 ,3 0 0 1 In ln3
to 3 1 2 ,0 0 0 /m m3
a fte r th e p ro c e d u re .
F ifte e n p a tie n ts (8 8 .2 p e rc e n t) s h o w e d a n in c re a s e in th e
N o r m a l R a n g e 5 0 - 1 5 0 2 0 0 - 4 0 0 2 0 - 5 0 I r o n , m g / d l
T I B C , m g / d l T S I , %
a d e c re a s e i n i ro n
Iron Measurements
p a tie n ts (7 0 p e rc e n t) s h o w e d
c o n c e n tra tio n s a n d in 7 o f th e s e
it re m a in e d b e lo w 5 0 p e rc e n t o f
th e in itia l v a lu e . F a lls in fe rritin
le v e Is w e re s e e n i n 1 6 p a tie n ts
(9 4 p e rc e n t). S u c h d e c re a s e s
w e re g re a te r th a n 5 0 p e rc e n t
fro m th e b a s e lin e v a lu e s in 1 2
(7 0 p e rc e n t) o f th e s u b je c ts . In
8 p a tie n ts (4 7 p e rc e n t), th e fin a l
fe rritin v a lu e s w e re b e lo w 1 0 n g /
In l, in d ic a tin g s e v e re iro n
d e p le tio n (F ig . 1 ).
M A R T I N E Z , J . A . B . ; G U E R R A , C . C . C , ; N E R Y , L . E . e t a I . - lr o n s t o r e s a n dc o a g u la t io n p a r a m e t e r s in p a ~ ie n t s w it h h y p o x e m ic p o ly c y t h e m ia s e c o n d a r y t o c h r o n ic o b s t r u c t iv e p u lm o n a r y d is e a s e : T h e e f f e c t o f p h le b o t o m ie s
'O S T P K .E B O T O M Y
r-P C O .o s -,
P R E P H E L E B O T O M Y ,-- p c0 .0 5 -,
300 410
400 250
1
_ 350 E
200 .5._
I
zz t=
o
~ 250
e: 150 ~
200
100 150
100 50
50
P R E 'O S T P H E L E B O T O M Y P K .E B O T O M Y
2 ). S e ru m fe rritin is a g o o d in d ic a to r o f
iro n b o d y sto re s, a n d th e d ro p in its le v e Is
d e n o te s th a t th e tissu e iro n c o n te n ts2 8 ,2 9
w e re a lso a ffe c te d .
Iro n d e fic ie n c y sta te s m a y h a v e
e ffe c ts o n re d b lo o d c e lls a n d so lid o rg a n
tissu e s. A lth o u g h it w o u ld b e e x p e c te d
th a t iro n d e fic ie n c y c o u ld h a v e a n
in h ib ito ry e ffe c t o n C O P D h y p o x ic
h e m o p o ie tic re sp o n se , th is is n o t a lw a y s
th e c a se . S e c o n d a ry p o ly c y th e m ia
a sso c ia te d to iro n d e fic ie n c y in C O P D
p a tie n ts h a s b e e n d e sc rib e d .3 0
,3 1 S o m e
a u th o rs re p o rt th a t iro ,n d e p le tio n m a y n o t
b e a n im p e d in g fa c to r to in c re a se s in re d
c e ll m a ss, a n d th a t in su c h c a se s
p o ly c y th e m ia is a sso c ia te d w ith
h y p o c h ro m ic e ry th ro c y te s.3 2
A n iro n d e fic ie n c y sta te m a y a lso
F ig u re 1 - Iro n a n d fe rritin in d iv id u a l v a lu e s fo rC O P Op a tie n ts s u b m itte d to s e q u e n c ia l d i stu rb th e m u sc u la r o x id a ti v e
p h le b o to m ie s . m e ta b o lism , in te rfe rin g w ith th e p a tie n t's
w o rk p e rfo rm a n c e . 16T h e tissu e h a e m iro n
c o m p o u n d s in c lu d e th e c y to ç h ro m e s, m y o g lo b in , c a ta la se
a n d p e ro x id a se . In a d d itiQ D , m u sc le s h a rb o r n o n -h a e m
iro n -c o n ta in in g e n z y m e s su c h a s N A D H d e h y d ro g e n a se ,
su c c in ic d e h y d ro g e n a se a n d x a n th in e o x id a se . F in a lly ,
so m e e n z y m e s su c h a s a c o n ita se a n d try p to p h a n p y rro la se
re q u ire iro n o r h a e m a s a c o fa c to r.
E x p e rim e n ta l stu d ie s o n ra ts h a v e fo u n d th a t m ild
a n d se v e re iro n d e fic ie n c y a re a sso c ia te d w ith d e fic its 9 f
c y to c h ro m e c a n d m io g lo b in in sk e le ta l m u sc le .3 3 F IN C H
e t a 1 .3 4
c o m p le te d stu d ie s o f w o rk p e rfo rm a n c e o n iro n
-d e fic ie n t ra ts, k e e p in g h e m o g lo b in le v e Is c o n sta n t th ro u g h
e x c h a n g e tra n sfu sio n s. It w a s se e n th a t iro n -d e fic ie n t ra ts
h a d a sig n ific a n t sh o rte r ru n n in g tim e th a n ç o n tro ls w ith
sim ila r h e m o g lo b in le v e Is. A fte r 4 d a y s o f iro n
a d m in istra tio n , th e iro n -d e fic ie n t g ro u p a c h ie v e d n o rm a l
ru n n in g tim e s.
B io c h e m ic a l a n a ly sis d o n e a t th a t tim e su g g e ste d th a t
a n in c re a se in th e ra te o f o x id a tiv e p h o sp h o ry la tio n w ith
a -g ly c e ro p h o sp h a te a s a su b stra te p la y e d a k e y ro le in th e
im p ro v e m e n t o f w o rk p e rfo rm a n c e . N o n -p u b lish e d d a ta
fro m o u r la b o ra to ry h a v e sh o w n sm a ll b u t sig n ific a n t
in c re a se s in th e m a x im a l w o rk lo a d a n d o x y g e n
c o n su m p tio n re a c h e d b y 1 5 iro n -d e fic ie n t, a n e m ic w o m '
4 d a y s a fte r a d m in istra tio n o fIV iro n -d e x tra n , e v ~ n th o u g h
th e ir h e m o g lo b in le v e Is h a d n o t c h a n g e d .
T h e re fo re , w e c a n h y p o th e siz e th a t C O P D p a tie n ts
w h o sh o w a m e Iio ra tio n o f e x e rc ise p e rfo rm a n c e a fte r
p h Ie b o to m ie s ln ig h t h a v e th is e ffe c t a tte n u a te d if
sim u Ita n e o u s iro n d e fic ie n c y sta te s d e v e Io p . T h e
D IS C U S S IO N
p la te le t c o u n t, 4 o f th e m w ith fin a l m e a su re m e n ts b e y o n d
4 0 0 ,O O O /m m .3 S tu d ie s o f p la te le t a g g re g a tio n m a d e w ith
d iffe re n t stim u la n t a g e n ts d id n o t sh o w a n y sig n ific a n t
p o stp h le b o to m ie s c h a n g e .
A d e q u a te th ro m b o e la sto g ra p h y stu d ie s b e fo re a n d
a fte r p h Ie b o to m ie s c o u ld n o t b e o b ta in e d in 4 p a tie n ts d u e
to te c h n ic a l p ro b le m s. In th e 1 3 stu d ie d su b je c ts, a
sig n ific a n t d e c re a se w a s n o tic e d in
k
d u rin g th e fin a lstu d ie s. A lth o u g h
r
a lso e x p e rie n c e d a d e c re a se , su c hc h a n g e d id n o t re a c h sta tistic a l sig n ific a n c e . F in a lly ,
a
v a lu e s sh o w e d a sig n ific a n t p o stp h le b o to m ie s in c re a se .
P h le b o to m y m a y b e u se d in th e c a re o f C O P D
p a tie n ts in a n a tte m p t to re d u c e d e trim e n ta l c a rd io v a sc u la r
e ffe c ts o f b lo o d h y p e rv isc o sity d u e to p o ly c y th e m ia . T h e
b a sis fo r th is p ro c e d u re is th e e ffe c t o f p h Ie b o to m y in
im p ro v in g h e m o d y n a m ic c o n d itio n s a n d e x e rc ise
p e rfo rm a n c e in su c h p a tie n ts.2-4,7 ,8 ,1 1 -1 3 H o w e v e r, th e e ffe c ts
o f th is k in d o f th e ra p y o n h e m o sta sis a n d iro n re se rv e s o f
C O P D p a tie n ts h a d n o t b e e n th o ro u g h Iy e x a m in e d b e fo re .
O u r p re se n t re su Its sh o w e d th a t th e n o rm a liz a tio n o f
h e m a to c rits b y p h le b o to m ie s le d to a n im p o rta n t re d u c tio n
in iro n b o d y c o n te n ts. T h is b e c a m e a p p a re n t b y th e
sig n ific a n t d e c re a se s in se ru m iro n , fe rritin a n d T S I (T a b le
T a b le 3
R e s u lt s o f c o a g u la t io n s t u d ie s ( M e a n : ! :S E ) o b t a in e d p r e - a n d p o s t p h le b o t o m y
N o r m a l R a n g e P r e p h le b o t o m y P o s t p h le b o t o m y
A P T T 0 . 9 0 - 1 . 2 5 1 . 1 4 : t 0 . 0 6 1 . 0 6 : t 0 . 0 4
F ib r in o g e n , m g / d l 2 0 0 - 4 0 0 2 6 2 : t 1 2 2 3 6 . 5 : t 1 3 . 2
P la t e le t s / m m3 2 0 0 , 0 0 0 - 4 0 0 , 0 0 0
2 2 7 , 3 0 0 : t 1 3 , 9 0 0 3 1 2 , 5 0 0 : t 3 0 . 2 *
P la t e le t A g g r e g a t io n
A D P 3 m M , % 6 0 - 8 0 6 5 . 8 : t 5 . 1 7 4 . 1 : t 3 . 9
A D P 1 m M , % 6 0 - 8 0 6 3 . 0 : t 6 . 4 6 9 . 8 : t 4 . 7
E p in e p h r in e , % 6 0 - 8 0 6 3 . 3 : t 6 . 4 6 4 . 6 : t 5 . 9
C o lla g e n , % 6 0 - 8 0 8 0 . 0 : t 2 . 8 7 8 . 2 : t 3 . 2
T h r o m b o e la s t o g r a p h y #
', m m 7 . 2 - 9 . 6 9 . 9 : t 0 . 7 9 . 0 : t 0 . 5
k,mm
5 . 8 - 7 . 8 7 . 5 : t 0 . 7 4 . 5 : t 0 . 3 *a , m m 4 8 - 6 0 5 3 . 6 : t 1 . 4 6 0 . 4 : t 1 . 1 *
A P T T : a c t iv a t e d p a r t ia l t h r o m b o p la s t in t im e ; A D P : a d e n o s in e d ip h o s p h a t e ; r : r e a c t io n t im e ;
k
c o a g u la t io n t im e ; a : m a x im u m c lo t a m p lit u d e* p < 0 . 0 5 ; # d a t a f r o m 1 3 p a t ie n t s
d e v e lo p m e n t o f h y p o c h ro m ic re d c e Ils in su c h situ a tio n s
c o u ld im p a ir o x y g e n tra n sp o rt to th e tissu e s, e v e n w ith
th e p re se n c e o f a h ig h h e m a to c rit. F u rth e rm o re , iro n
d e p le tio n a t th e sk e le ta l m u sc le le v e I c o u ld le a d to p o o r e n z y m a tic fu n c tio n a n d o x y g e n u tiliz a tio n .
In o rd e r to e v a lu a te th e e ffe c ts o f H e t c o rre c tio n b y
p h le b o to m ie s o n th e h e m o sta sis o f C O P D p o ly c y th e m ic
p a tie n ts, te sts w e re d o n e to a sse ss th e in trin sic p a th w a y , p la te le t a n d fib rin o g e n c o n c e n tra tio n s, p la te le t a g g re g a tio n
a n d T E G . A re n e w e d in te re st in T E G m o n ito rin g h a s b e e n
se e n re c e n tly b e c a u se its tra c in g re p re se n ts th e sh e a r
e la stic ity o f a b lo o d c lo t a s it fo rm s, m a tu re s, re tra c ts a n d
e v e n tu a IIy ly se s. T h is te st is e x tre m e ly se n sitiv e to id e n tify h y p e rc o a g u la b i lity . 2 7
T h e in itia l e v a lu a tio n p re p h le b o to m y d id n o t sh o w
a n y e v id e n c e o f h y p e rc o a g u la b ility , sin c e m o st o f th e te st
re su Its w e re w ith in th e n o rm a l ra n g e fo r o u r c o a g u la tio n
la b o ra to ry (T a b le 3 ). T h e o n ly e x c e p tio n w a s th e re a c tio n
tim e
r,
w h ic h re p re se n ts th e tim e re q u ire d fo r in itia I fib rinfo rn la tio n , w h ic h w a s slig h tly in c re a se d . T h is la st fin d in g in d e e d is ln o re c o m p a tib le w ith a h y p o c o a g u la b ility
c o n d itio n .
T h e m e a n p la te le t c o u n t in c re a se d sig n ific a n tly a fte r
p h le b o to m y fro m 2 2 7 ,3 0 0 to 3 1 2 ,5 0 0 m m3 (T a b le 3 ).
In c re a se s in p la te le t n u m b e r h a v e b e e n re p o rte d a fte r c h ro n ic a n d a c u te b lo o d 1 0 ss.3 5 .3 6T h e ln e c h a n ism s in v o lv e d
in su c h rise s m a y b e re la te d to iro n d e p le tio n , sin c e a n
in h ib ito ry e ffe c t o f th is m e ta l in th ro b o p o ie sis h a s b e e n
d e sc rib e d .3 5 O th e r stu d ie s su g g e st th e p re se n c e o f a n
h u m o ra l fa c to r, th e th ro m b o p o ie tin , in p la sm a fro m a n im a Is
w ith p o sth e m o rrh a g ic th ro m b o c y to sis.3 7
In o p p o sitio n to p re v io u s re p o rts o n C O P D p a tie n ts,
w e d id n o t o b se rv e a n in c re a se in p la te le t a g g re g a tio n a fte r
p h le b o to m y .'X JX -4 0T h o se re p o rts a tte m p te d to re la te th e ir
fin d in g s to in c re a se s in c irc u la tin g c a th e c o la m in e s,
e sp e c ia l1 y se ro to n in , se c o n d a ry to th e b le e d in g . T h e
d iffe re n c e s b e tw e e n p re se n t a n d fo rm e r re su lts ln a y b e
e x p la in e d b y th e fa c t th a t o u r b lo o d sa m p le s w e re c o lle c te d la te r, a ro u n d o n e w e e k a fte r th e Ia st p h le b o to m y , w h e n
n o rm a liz a tio n o f c a th e c o la m in e le v e Is p ro b a b ly h a d
a lre a d y o c c u rre d .
O th e r sig n ific a n t p o stp h le b o to m y c h a n g e s w e re a n
e x te n sio n o f
a
a n d sh o rte n in g o fk
in th e T E G tra c in g s(T a b le 3 ). T h e p a ra ln e te r
a
re p re se n ts th e ln a x im u ln c lo tstre n g th . T h e p a ra m e te r
k
re p re se n ts th e ~ p e e d o f c lo tfo rln a tio n , fib rin c ro sslin k in g a n d p la te le t-fib rin in te ra c tio n . B o th p a ra m e te rs m a y b e d e c re a se d in c a se s o f
th ro ln b o c y to p e n ia o r h y p o fib rin o g e n e m ia . A lth o u g h w ith
n o sta tistic a l sig n ific a n c e , th e
r
v a lu e a lso d e c re a se d p o stp h le b o to m y .T h e se la st re su lts su g g e st th a t im p ro v e m e n ts in
th ro m b in fo n n a tio n h a v e o c c u rre d p o stp h le b o to m y . T h is
c o u ld b e a n o n -sp e c ific re a c tio n to b le e d in g , a s in c re a se s in c o a g u la tio n a c tiv ity m e a su re d b y T G E fo llo w in g b lo o d
M A R T I N E Z , J . A . B . ; G U E R R A , C . C . C , ; N E R Y , L . E . e t a I . - I r o n s t o r e s a n d c o a g u la t io n
p a r a m e t e r s in p a t ie n t s w it h h y p o x e m ic p o ly c y t h e m ia s e c o n d a r y t o c h r o n ic o b s t r u c t iv e
p u lm o n a r y d is e a s e : T h e e f f e c t o f p h le b o t o m ie s
losses during surgery have been described.
Such changes
were documented
even 2 hours after surgery and could
have accounted for cathecolamine
releases related to stress,
and the entry into circulation
of coagulation
factors froln
the hepatic interstitial fluido However, our final coagulation
tests
were
performed
about
7 days
after
the
last
phlebotomy, again making this interpretation less probable.
Another possibility
is that decreased
helnatocrits
led to
falls
in viscosity
with
better
liver
perfusion
and
oxygenation,
promoting
improvelnent
its production
of
coagulation
factors.
The increase
in
aInay also
be related
to the
en)argement'
of the platelet
counting.
Although
the
fibrinogen
leveIs have not changed,
the growth
in
a
postphlebotomy
may also be in part secondary to a higher
availability
of fibrinogen
for the fibrin network making.
In high Hct samples, the total alnount of fibrinogen may
not be enough to make a fibrin network capable of strongly
containing
an increased
nUlnber of red cells. Low Hct
samples may have proportionally
Inore fibrinogen
to be
used in the fibrin network,
producing
clots with greater
texture.
In summary,
the coagulation
tests
made
after
phlebotolny
have
shown
slnall
changes
towards
an
augmented coagulability.
Such changes could be the result
of an organic reaction to bleeding, especially the increase
in platelet counting. Although the precise clinicaI meaning
of these findings are unknown,
the literature
contains
a
reference to a patient with pulmonary
artery thrombosis
following phlebotomies.
42However,
alnong the different
tests done, only
k
reached a final value out of our normal
laboratory range. Therefore, we speculate that the detected
changes do not represent a harmful thrombotic
risk related
to the phlebotomies
Based in the present
results,
we do oot think the
prophylactic
adlninistration
of anticoagulant
agents after
phlebotomies
in COPD patients is necessary. In addition,
we
recolnmend
oral
iron
supplementation
after
phlebotolnies
for polycythelnic
COPD patients
in order
to avoid iron deficiency.
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p a ra m e te rs in p a tie n ts w ith h y p o x e m ic p o ly c y th e m ia s e c o n d a ry to c h ro n ic o b s tru c tiv e p u lm o n a ry d is e a s e : T h e e ffe c t o f p h le b o to m ie s
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