1) Therapeutic phlebotomy is used to lower red blood cell mass and blood viscosity in patients with secondary polycythemia due to conditions like COPD.
2) Studies have shown that phlebotomy can improve symptoms, cerebral blood flow, and exercise tolerance in polycythemic COPD patients by reducing blood viscosity.
3) The benefits of phlebotomy are thought to be due to improved cardiac function and oxygen delivery resulting from decreased peripheral vascular resistance and improved myocardial perfusion with reduced blood viscosity.
A simple description of a less understood topic in Intensive Care Medicine. Aim to make understanding and management easy for the residents and prevention steps for all ICU workers.
A simple description of a less understood topic in Intensive Care Medicine. Aim to make understanding and management easy for the residents and prevention steps for all ICU workers.
Severe hypertension that is a potentially life-threatening condition refers to a hypertensive crisis.
Severe hypertension is further classified into hypertensive emergencies or hypertensive urgencies.
Hypertensive emergency refers to a severe hypertension that is associated with new or progressive end-organ damage. In these clinical situations, blood pressure should be reduced immediately to prevent or minimize organ dysfunction.
Hypertensive urgency refers to severe hypertension without evidence of new or worsening end-organ injury.
A hypertensive emergency is hypertension with acute impairment of one or more
organ systems that can result in irreversible organ damage. Especially:-
Central nervous system
Cardiovascular system
Renal system.
The term hypertensive emergency is primarily used as a specific term for a hypertensive crisis with a diastolic blood pressure greater than or equal to 120mmHg and/or systolic blood pressure greater than or equal to 180mmHg.
Hypertensive emergency differs from hypertensive crisis in that, in the former, there is evidence of acute organ damage.
Severe hypertension that is a potentially life-threatening condition refers to a hypertensive crisis.
Severe hypertension is further classified into hypertensive emergencies or hypertensive urgencies.
Hypertensive emergency refers to a severe hypertension that is associated with new or progressive end-organ damage. In these clinical situations, blood pressure should be reduced immediately to prevent or minimize organ dysfunction.
Hypertensive urgency refers to severe hypertension without evidence of new or worsening end-organ injury.
A hypertensive emergency is hypertension with acute impairment of one or more
organ systems that can result in irreversible organ damage. Especially:-
Central nervous system
Cardiovascular system
Renal system.
The term hypertensive emergency is primarily used as a specific term for a hypertensive crisis with a diastolic blood pressure greater than or equal to 120mmHg and/or systolic blood pressure greater than or equal to 180mmHg.
Hypertensive emergency differs from hypertensive crisis in that, in the former, there is evidence of acute organ damage.
Major hemorrhage is a leading cause of mortality world over. Counteracting severe blood loss usually requires transfusion of a large number of blood units, qualifying as massive transfusion more often than not. Concepts in massive transfusion have undergone substantial changes in the past years not just with acquisition of new knowledge on this subject but with technical advances in component preparation. We aim at providing an overview of the changing trends and concepts in management of massive blood loss.
Austin Spine is an open access, peer reviewed, scholarly journal dedicated to publish articles covering all areas of Spine.
The journal aims to promote latest information and provide a forum for doctors, researchers, physicians, and healthcare professionals to find most recent advances in the areas of Spine. Austin Spine accepts research articles, reviews, mini reviews, case reports and rapid communication covering all aspects of Spine.
Austin Spine strongly supports the scientific up gradation and fortification in related scientific research community by enhancing access to peer reviewed scientific literary works. Austin Publishing Group also brings universally peer reviewed journals under one roof thereby promoting knowledge sharing.
EVALUATING RISK OF HEART FAILURE WITH ERYTHROPOIETIN IN CHRONIC ANEMIAPARUL UNIVERSITY
Erythropoietin (EPO) is the primary regulatory hormone of
erythropoiesis. Hypoxia induces an increase in EPO hormone
production in the kidney which promotes the viability, proliferation,
and terminal differentiation of erythroid precursors, and causing an
increase in red blood cell mass. Any abnormality that reduces the renal
secretion of or bone marrow response to erythropoietin may result in
anemia. The approval of recombinant human erythropoietin
(epoetinalfa) by the US FDA in 1989, epoetinalfa and similar agents
now collectively known as erythropoietin stimulating agents (ESA)
have become the standard of care for the treatment of the
erythropoietin-deficient anemia. Studies suggest that in patients with
high serum erythropoietin is associated with risk of recurrent heart
failure (HF) and mortality. Thromboembolic complications can be
increased in patients receiving erythropoietin. the use of
erythropoiesis-stimulating agents though reduces the need for transfusions it is associated
with increased complications, including higher mortality and increased risk of
thromboembolic and cardiovascular events leading to congestive heart failure.
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
These lecture slides, by Dr Sidra Arshad, offer a quick overview of the physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar lead (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
6. Describe the flow of current around the heart during the cardiac cycle
7. Discuss the placement and polarity of the leads of electrocardiograph
8. Describe the normal electrocardiograms recorded from the limb leads and explain the physiological basis of the different records that are obtained
9. Define mean electrical vector (axis) of the heart and give the normal range
10. Define the mean QRS vector
11. Describe the axes of leads (hexagonal reference system)
12. Comprehend the vectorial analysis of the normal ECG
13. Determine the mean electrical axis of the ventricular QRS and appreciate the mean axis deviation
14. Explain the concepts of current of injury, J point, and their significance
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. Chapter 3, Cardiology Explained, https://www.ncbi.nlm.nih.gov/books/NBK2214/
7. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
- Video recording of this lecture in English language: https://youtu.be/kqbnxVAZs-0
- Video recording of this lecture in Arabic language: https://youtu.be/SINlygW1Mpc
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
2. POLYCYTHEMIA
Polycythemia is a laboratory finding in which there is an increased number of
red blood cells (RBC), along with an accompanying increase in the
concentration of hemoglobin in the peripheral blood.
3. Laboratory parameters —
●HCT – The HCT is expressed as the percent of a blood sample occupied by intact
RBC. Polycythemia in the adult patient is considered to be present when the HCT is
>48 in women or >49 percent in men.
●HGB – HGB is expressed in grams per 100 mL of whole blood or in grams per
liter of whole blood. Polycythemia in the adult is considered to be present when the
HGB is >16.0 g/dL (>160 g/L) in women or >16.5 g/dL (>165 g/L) in men.
●RBC count – The RBC count is expressed as the number of RBC per microL or
liter of whole blood. The normal RBC count is approximately 5 x 106 cells per
microL or 5 x 1012 cells per L.
4. Polycythemia may be due to a myriad of causes. The polycythemias can
be classified as relative and absolute.
Relative polycythemia is a disorder in which the patient characteristically
has a modest elevation of the hematocrit level without an elevated RBC
mass but rather because of contraction of the plasma volume.
The absolute polycythemias are accompanied by an actual increase in
the circulating RBC mass.
5.
6. Classification of the Absolute
Erythrocytosis.
Acquired
EPO-mediated
Hypoxia-driven
Central hypoxic process
• Chronic lung disease
• Right-to-left cardiopulmonary vascular
shunts
• Carbon monoxide poisoning
• Smoker’s erythrocytosis
• Hypoventilation syndromes including sleep
apnoea (high-altitude habitat)
Local renal hypoxia
• Renal artery stenosis
• End-stage renal disease
• Hydronephrosis
• Renal cysts (polycystic kidney disease)
Pathologic EPO production
Tumours (Hypoxia independent)
Hepatocellular carcinoma
Renal cell cancer
Cerebellar haemangioblastoma
Parathyroid carcinoma/adenomas
Uterine leiomyomas
Pheochromocytoma
Meningioma
Exogenous EPO
Drug associated
Treatment with androgen preparations
Postrenal transplant erythrocytosis
Idiopathic erythrocytosis
7. Secondary Polycythemia
Secondary Polycythemia: Polycythemia can be secondary to increased
erythropoietin production either indirectly via response to chronic hypoxia, as in
lung or cardiac disease, in smokers, at high altitudes, and in carbon monoxide
poisoning; or directly due to pathological increase in erythropoietin, as seen
with impaired renal perfusion (i.e. renal artery stenosis) or erythropoietin
producing tumors. Polycythemia can also occur after kidney transplantation
and in response to other therapeutic interventions (e.g. testosterone). Elevated
hematocrit may lead to increased blood volume and viscosity, resulting in
headache, hypertension, visual disturbances, lethargy, weakness and
thromboembolic events.
Treatment is therefore intended to lower the RBC mass and viscosity.
Decisions regarding treatment should be made on an individual basis.
9. Polycythemias of Pulmonary Disease
Patients of pulmonary disease frequently have arterial hypoxemia, leading to increased
production of EPO and polycythemia. Excessive EPO production occurs when the PaO2
is sustained below 67 mmHg as a result of severely impaired pulmonary mechanics.
Moderate elevations of hematocrit have been estimated to occur in 20% of patients with
COPD. Polycythemia in this setting can contribute to pulmonary hypertension, pulmonary
endothelial Cell dysfunction, reduced cerebral blood flow, hyperuricemia, gout, and an
increased risk of venous thromboembolic disease
10. Therapeutic phlebotomy, the removal of whole blood, is used for several indicated
diseases to lower either red blood cell mass, blood viscosity, and/or reduce overall
iron burden in non-anemic patients. Whether therapeutic phlebotomy affects
morbidity or mortality has never been evaluated in large unequivocal randomized
controlled trials. As a consequence, absolute standardized indications for each
disease are unavailable and specific regimens are individually tailored to patients’
needs.
In patients with erythrocytosis, phlebotomy results in iron restricted erythropoiesis
and decreased RBC mass which decreases the blood viscosity, improving cardiac
hemodynamics and oxygen delivery, and decreases the risk of thrombosis. The
same goals can also be accomplished by using erythrocytapheresis which removes
the equivalent of two units of RBCs without removing platelets or plasma while
Replacing lost volume with saline.
Therapeutic phlebotomy
11. Benefit of limited venesection in patients with HPD was demonstrated by Weisse et al
(1975), who showed that reducing the Hct to 0.50–0.52 led to an improvement in exercise
tolerance, but a further staged reduction to Hct of 0.45 did not give additional benefit.
Numerous other non-controlled patient series have also suggested that control of the Hct
reduces pulmonary vascular resistance (Segel & Bishop, 1966; Harrison et al, 1973;
Weisse et al, 1975; Harrison & Stokes, 1982), improving cerebral blood flow and
psychometric testing (Menon et al, 1981; Wedzicha et al, 1983) as well as subjectively
helping confusion and headache (Wade et al, 1981)
12. Effects of Venesection on Cerebral Function in Chronic
Lung Disease
R. BORNSTEIN, D. MENON, E. YORK, B. SPROULE and C. ZAK
THE CANADIAN JOURNAL OF NEUROLOGICAL SCIENCES , Nov 1980
Regional cerebral blood flow measurements and neuropsychological testing were
conducted before and after venesection on 6 patients with polycythemia secondary
to chronic obstructive pulmonary disease. Venesection resulted in lowered viscosity
and hematocrit, and an accompanying improvement in cerebral perfusion and mental
function. Blood flow was significantly increased in the left cerebral hemisphere
following phlebotomy, and there was significant improvement in sensory & mental
function. Cerebral function would appear to be related to blood flow alterations
influenced by the viscosity of the blood
13. Symptomatic and Pulmonary Response to Acute Phlebotomy in
Secondary Polycythemia
Lang M. Dayton, M.D.; R. E. McCullough; David J. Scheinhorn, M.D.; John V. Weil, MD.
CHEST, 68: 6, DECEMBER, 1975
A double-blind study of the effects of phlebotomy was carried out in 18 patients with
polycythemia secondary to severe hypoxemic lung disease. Eleven subjects under went a
single phlebotomy of 10 percent of their blood volume, and eight patients serving as controls
underwent a sham procedure. Eight of the phlebotomized subjects, but none of the controls,
reported subjective clinical improvement (P < 0.005). Subjects who noted improvement after
venesection had higher hematocrit readings than those who did not (P < 0.02). Symptomatic
relief seemed to be most dramatic in those with clinical evi dence of congestive heart failure. In
contrast to this clear cut subjective improvement, phlebotomy did not alter objective indices of
airway obstruction, lung elastic recoil, pulmonary gas exchange, or exercise tolerance in either
the phlebotomized or the control group. Thus, although phlebotomy produced subjective
benefit in the majority of patients studied, it was not associated with objective improvement in
lung function or exercise tolerance.
14. The study demonstrates that the exercise capacity of the polycythemic COPD
patient is increased post-phlebotomy. The improvement in the exercise tolerance
appears to be due to improved cardiac function as evidenced primarily by an
increased stroke volume. It was hypothesized that the improved cardiac function is
due to a reduced peripheral vascular resistance due to decreased viscosity of the
blood. Improved cardiac contractility due to better myocardial perfusion might also
contribute to the improved cardiac function.
Exercise Performance of Polycythemic Chronic Obstructive
Pulmonary Disease Patients· Effect of Phlebotomies
Kota G. Ghetty, M.D., F.G.G.E; Richard W Light, M.D., F.G.G.E; David W Stansbury; and
Norah Milne, M.D. (Chest 1990; 98:1073-77)
15. Phlebotomy for rapid weaning and extubation in COPD
patient with secondary polycythemia and respiratory failure
Swagata Tripathy, Sudhansu S. Panda
Lung India • Vol 27 • Issue 1 • Jan - Mar 2010
A recent case report of one patient demonstrated more rapid weaning from a
ventilator, with earlier extubation, in an intubated patient with chronic
obstructive pulmonary disease. Weaning and extubation were facilitated with
phlebotomy removing 10% of his blood volume.
16. • Patients with HPD who develop an erythrocytosis should be evaluated by a
respiratory physician for consideration of long-term oxygen therapy or alternative
therapy (Grade A recommendation: Evidence level 1A).
• Patients who are symptomatic of hyperviscosity or have a Hct >0.56 should have
venesection to reduce this to 0.50–0.52 (Grade B recommendation: Evidence
level III).
Recommendations: Hypoxic pulmonary disease
British Journal of Haematology, 130, 174–195 (2005)
doi:10.1111/j.1365-2141.2005.05535.x
17. Classification of grades of
recommendations
A: Requires at least one randomised controlled
trial as part of a body of literature of overall
good quality and consistency addressing
specific recommendation (evidence levels Ia,
Ib)
B: Requires the availability of well conducted
clinical studies but no randomised clinical trials
on the topic of recommendation (evidence
levels IIa, IIb, III)
C: Requires evidence obtained from expert
committee reports or opinions and/or clinical
experiences of respected authorities. Indicates
an absence of directly applicable clinical
studies of good quality (evidence
level IV)
Classification of evidence levels
IA: Evidence obtained from meta-analysis of
randomised controlled trials
IB: Evidence obtained from at least one
randomised controlled trial
IIA: Evidence obtained from at least one well-
designed controlled study without
randomisation
IIb: Evidence obtained from at least one other
type of well-designed quasi-experimental study
III: Evidence obtained from well-designed non-
experimental descriptive studies, such as
comparative studies, correlation studies and
case studies
IV: Evidence obtained from expert committee
reports or opinions and/or clinical experiences
of respected authorities
Table I. Evidence statements and grades of recommendations.
18. Currently, experts in this field recommend that phlebotomy should be restricted to
individuals with symptoms or with extreme erythrocytosis (hematocrit >65%).
Clinical data to justify these recommendations are lacking.
Chronic oxygen therapy in patients with severe COPD has resulted in relief of hypoxia
and a modest reduction in hematocrit levels.
Pharmacologic interventions, including theophylline, inhaled nitric oxide, sildenafil, or
antagonism of the renin–angiotensin pathway with losartin, may also reduce the
degree of pulmonaryhypertension or secondary erythrocytosis.
19. Role of Limited phlebotomy
• Individuals with secondary erythrocytosis due to a response to chronic hypoxia (eg,
right-to-left cardiac shunt, chronic pulmonary disease) may have symptoms of an
increased blood volume/hyperviscosity (eg, fatigue, headache, blurred vision,
transient loss of vision, paresthesias, slow mentation) when their hematocrit rises to
65 percent or more.
•Cautious phlebotomy to reduce their hematocrit into the range of approximately 55 to
60 percent may result in relief of these symptoms, while a reduction in their
hematocrit to levels less than 55 percent range are likely to exacerbate symptoms of
their underlying hypoxic condition (eg, shortness of breath, dyspnea on exertion).
●Because such phlebotomies may be poorly tolerated, the first phlebotomy should be
limited in volume (eg, 250 mL rather than the standard 500 mL) and performed as
isovolemic phlebotomy (ie, replacement of removed blood with an equal volume of
crystalloid).