Medical Forum / Diseases and Disorders / Asthma / November 2003
Effects of phlebotomy
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doe - 19 Nov 2003 23:33 GMT Seems erythrocytosis .. too many red blood cells .. and polycythemia .. are .. the same ..
The marker used to assess polycythemia {too many red blood cells] is set by .. cost.
The higher the marker [red blood cells] to eliminate 'false positives' ..
So .. do YOU have the iron levels of a pre-menopausal woman?
You know that .. anemic .. one .. ?
THAT is the level research has shown to be the healthiest.
--------------------------------------------------------- Thus, although individuals at high risk for ASCVD are not Fe-overloaded, they seem to benefit, metabolically and hemodynamically, from lowering of body Fe to levels commonly seen in premenopausal females.
PMID: 12079862 --------------------------------------------------------
Chest 1990 Nov;98(5):1073-7 Exercise performance of polycythemic chronic obstructive pulmonary disease patients. Effect of phlebotomies.
Chetty KG, Light RW, Stansbury DW, Milne N Department of Medicine, VA Medical Center, Long Beach, CA 90822. The purpose of this study was to determine the effects of phlebotomy on the exercise tolerance and right and left ventricular ejection fraction of polycythemic patients with chronic obstructive pulmonary disease. Ten patients with COPD (mean FEV1 = 1.32 +/- 0.55 L) and polycythemia (mean Hct = 62 +/- 3 percent) were studied before and after their hematocrits had been reduced to approximately 50 percent. Post-phlebotomy the maximal oxygen consumption increased from 1.09 +/- 0.34 L/min to 1.26 +/- 0.43 L/min (p less than 0.05) and the maximum workload increased from 56.5 +/- 32.6 watts to 74.5 +/- 23.4 watts (p less than 0.05). The increase in the exercise tolerance appeared to be primarily due to an increased cardiac output at Emax. There was no relationship between the increases in the upright exercise capacity and changes in the supine ejection fractions of the right or left ventricular either at rest or during exercise. PMID: 2225946, UI: 91030710 _________________________________________________________________ Int J Cardiol 1994 Apr;44(2):175-7 Effects of phlebotomy on a patient with secondary polycythemia and angina pectoris.
Piccirillo G, Fimognari FL, Valdivia JL, Marigliano V Cattedra di Geriatria e Gerontologia Universita, La Sapienza, Rome, Italy. A 67-year-old man with polycythemia, secondary to chronic obstructive pulmonary disease, had angina attacks at rest treated successfully by supplementing conventional therapy with frequent phlebotomies. Although phlebotomy reduces arterial oxygen content, it also decreases blood viscosity, improves peripheral oxygen consumption and thus yields the clinical benefit. PMID: 8045664, UI: 94321077 _________________________________________________________________
Respiration 1979;38(6):305-13 Phlebotomy improves pulmonary gas exchange in chronic mountain polycythemia.
Cruz JC, Diaz C, Marticorena E, Hilario V There is not unanimous agreement in the literature regarding the effects of bleeding on pulmonary gas exchange in polycythemic patients. Spirometry, alveolar arterial O2 and CO2 tension differences, PaO2 breathing 100% oxygen and carbon monoxide-diffusing capacity were measured before and after 1 week of chronic phlebotomy in 4 chronic mountain polycythemic patients. Studies were carried out at 3,700 m above sea level (PB = 491 mm Hg). Before phlebotomy, 2 patients showed abnormal spirometry and gas exchange. Only 1 patient had high PaCO2 and all of them showed low values of PaO2 breathing oxygen. Phlebotomy improved both spirometry and gas exchange. Improvement in arterial oxygen saturation and PaO2 could not be attributed to changes in alveolar ventilation, but rather to better distribution of VA/Qc ratios since physiological dead space decreased. Our results are similar to those reported in polycythemia vera patients. A significant correlation between the changes in PaO2 with phlebotomy and the control PaO2 have been found from 45 polycythemic patients with chronic obstructive pulmonary disease collected from the literature. It is concluded that excessive polycythemia worsened hypoxemia and that phlebotomy improved gas exchange. PMID: 538338, UI: 80146854 _________________________________________________________________ Am J Med 1983 Mar;74(3):415-20 Improved exercise tolerance of the polycythemic lung patient following phlebotomy.
Chetty KG, Brown SE, Light RW The present study evaluated the effects of therapeutic phlebotomy on the exercise tolerance and the maximal carbon dioxide output of polycythemic patients with chronic obstructive pulmonary disease. Fifteen maximal exercise studies were performed before and after phlebotomy in patients with moderate to severe chronic obstructive pulmonary disease (mean forced expiratory volume in one second [FEV1]= 970 ml). After phlebotomy there were no significant differences in pulmonary function, blood gases, oxygen consumption, or carbon dioxide production at rest. However, after phlebotomy there was a significant increase in the exercise tolerance of the patients. The mean workload, the duration of exercise, the maximal oxygen consumption, the maximal carbon dioxide production, and the ventilation at maximal exercise all increased significantly. The improved exercise tolerance after phlebotomy appeared due to an increased cardiac output generated mainly through an increased stroke volume. We hypothesize that the increased stroke volume was due to a higher ejection fraction of the right ventricle secondary to a lower pulmonary artery pressure. This study provides further evidence that patients with chronic obstructive pulmonary disease who have polycythemia benefit by therapeutic interventions that maintain their hematocrits below 55 percent. PMID: 6402930, UI: 83149913 _________________________________________________________________ Surgery 1980 Nov;88(5):686-92 Increased oxygen uptake following phlebotomy and simultaneous fluid replacement in polycythemic patients.
Shah DM, Powers SR Jr, Bernard HR, Scovill WA, Newell JC, Stratton HH To study the isolated effects of decreased hemoglobin concentration without volume loss, eight patients with the diagnosis of polycythemia were studied following acute phlebotomy and simultaneous volume replacement. These patients had been treated previously by repeated phlebotomy, without volume replacement, to a hemoglobin level of 14.8 +/- 0.5 gm%. Following hemodilution by additional phlebotomy and volume replacement, which further lowered the mean hemoglobin level to 11.4 +/- 0.4 gm%, cardiac index increased significantly from 2.8 +/- 0.3 to 3.5 +/- 0. 3 liter/min/m(2) (P<0.05), oxygen delivery did not change, but total body oxygen consumption increased significantly from 140 +/- 16 to 180 +/- 15 ml/min/m(2) (P<0.05). Mixed venous PO2, systemic and pulmonary vascular resistance decreased significantly (P<0.05). Vascular pressure, heart rate, intrapulmonary shunt, arterial pH and bicarbonate, limb blood flow, limb oxygen delivery and limb oxygen consumption did not change. Thus, with phlebotomy and fluid replacement, a reduction of hemoglobin concentration to a subnormal level increased oxygen consumption without lowering oxygen delivery. PMID: 7434209, UI: 81056744 _________________________________________________________________
Who loves ya. Tom
 Signature Jesus Was A Vegetarian! http://jesuswasavegetarian.7h.com Man Is A Herbivore! http://pages.ivillage.com/ironjustice/manisaherbivore DEAD PEOPLE WALKING http://pages.ivillage.com/ironjustice/deadpeoplewalking
Colin Campbell - 19 Nov 2003 23:54 GMT >So .. do YOU have the iron levels of a pre-menopausal woman? > >You know that .. anemic .. one .. ? > >THAT is the level research has shown to be the healthiest. For people with COPD and polycythemia.
Nothing to do with asthma, however.
-- There can be no triumph without loss. No victory without suffering. No freedom without sacrifice.
doe - 20 Nov 2003 01:48 GMT >Subject: Re: Effects of phlebotomy >From: Colin Campbell activated_95b@earthlink.net(remove underscore) [quoted text clipped - 10 lines] > >Nothing to do with asthma, however. I tell you what .. I .. tell .. YOU .. what I believe is related to asthma ..
Dig .. ?
Don;'t be snipping my posts and trying to become some sort of moderator ..
Dig .. ?
http://asthma.about.com/library/weekly/aa112999a.htm
<<snip>> Asthma falls into a category of diseases known as COPD, which stands for Chronic Obstructive Pulmonary Disease <<snip>> ------------------------------------------------------------
Seems erythrocytosis .. too many red blood cells .. and polycythemia .. are .. the same ..
The marker used to assess polycythemia {too many red blood cells] is set by .. cost.
The higher the marker {red blood cells] to eliminate 'false positives' ..
So .. do YOU have the iron levels of a pre-menopausal woman?
You know that .. anemic .. one .. ?
THAT is the level research has shown to be the healthiest.
--------------------------------------------------------- Thus, although individuals at high risk for ASCVD are not Fe-overloaded, they seem to benefit, metabolically and hemodynamically, from lowering of body Fe to levels commonly seen in premenopausal females.
PMID: 12079862 --------------------------------------------------------
Chest 1990 Nov;98(5):1073-7 Exercise performance of polycythemic chronic obstructive pulmonary disease patients. Effect of phlebotomies.
Chetty KG, Light RW, Stansbury DW, Milne N Department of Medicine, VA Medical Center, Long Beach, CA 90822. The purpose of this study was to determine the effects of phlebotomy on the exercise tolerance and right and left ventricular ejection fraction of polycythemic patients with chronic obstructive pulmonary disease. Ten patients with COPD (mean FEV1 = 1.32 +/- 0.55 L) and polycythemia (mean Hct = 62 +/- 3 percent) were studied before and after their hematocrits had been reduced to approximately 50 percent. Post-phlebotomy the maximal oxygen consumption increased from 1.09 +/- 0.34 L/min to 1.26 +/- 0.43 L/min (p less than 0.05) and the maximum workload increased from 56.5 +/- 32.6 watts to 74.5 +/- 23.4 watts (p less than 0.05). The increase in the exercise tolerance appeared to be primarily due to an increased cardiac output at Emax. There was no relationship between the increases in the upright exercise capacity and changes in the supine ejection fractions of the right or left ventricular either at rest or during exercise. PMID: 2225946, UI: 91030710 _________________________________________________________________ Int J Cardiol 1994 Apr;44(2):175-7 Effects of phlebotomy on a patient with secondary polycythemia and angina pectoris.
Piccirillo G, Fimognari FL, Valdivia JL, Marigliano V Cattedra di Geriatria e Gerontologia Universita, La Sapienza, Rome, Italy. A 67-year-old man with polycythemia, secondary to chronic obstructive pulmonary disease, had angina attacks at rest treated successfully by supplementing conventional therapy with frequent phlebotomies. Although phlebotomy reduces arterial oxygen content, it also decreases blood viscosity, improves peripheral oxygen consumption and thus yields the clinical benefit. PMID: 8045664, UI: 94321077 _________________________________________________________________
Respiration 1979;38(6):305-13 Phlebotomy improves pulmonary gas exchange in chronic mountain polycythemia.
Cruz JC, Diaz C, Marticorena E, Hilario V There is not unanimous agreement in the literature regarding the effects of bleeding on pulmonary gas exchange in polycythemic patients. Spirometry, alveolar arterial O2 and CO2 tension differences, PaO2 breathing 100% oxygen and carbon monoxide-diffusing capacity were measured before and after 1 week of chronic phlebotomy in 4 chronic mountain polycythemic patients. Studies were carried out at 3,700 m above sea level (PB = 491 mm Hg). Before phlebotomy, 2 patients showed abnormal spirometry and gas exchange. Only 1 patient had high PaCO2 and all of them showed low values of PaO2 breathing oxygen. Phlebotomy improved both spirometry and gas exchange. Improvement in arterial oxygen saturation and PaO2 could not be attributed to changes in alveolar ventilation, but rather to better distribution of VA/Qc ratios since physiological dead space decreased. Our results are similar to those reported in polycythemia vera patients. A significant correlation between the changes in PaO2 with phlebotomy and the control PaO2 have been found from 45 polycythemic patients with chronic obstructive pulmonary disease collected from the literature. It is concluded that excessive polycythemia worsened hypoxemia and that phlebotomy improved gas exchange. PMID: 538338, UI: 80146854 _________________________________________________________________ Am J Med 1983 Mar;74(3):415-20 Improved exercise tolerance of the polycythemic lung patient following phlebotomy.
Chetty KG, Brown SE, Light RW The present study evaluated the effects of therapeutic phlebotomy on the exercise tolerance and the maximal carbon dioxide output of polycythemic patients with chronic obstructive pulmonary disease. Fifteen maximal exercise studies were performed before and after phlebotomy in patients with moderate to severe chronic obstructive pulmonary disease (mean forced expiratory volume in one second [FEV1]= 970 ml). After phlebotomy there were no significant differences in pulmonary function, blood gases, oxygen consumption, or carbon dioxide production at rest. However, after phlebotomy there was a significant increase in the exercise tolerance of the patients. The mean workload, the duration of exercise, the maximal oxygen consumption, the maximal carbon dioxide production, and the ventilation at maximal exercise all increased significantly. The improved exercise tolerance after phlebotomy appeared due to an increased cardiac output generated mainly through an increased stroke volume. We hypothesize that the increased stroke volume was due to a higher ejection fraction of the right ventricle secondary to a lower pulmonary artery pressure. This study provides further evidence that patients with chronic obstructive pulmonary disease who have polycythemia benefit by therapeutic interventions that maintain their hematocrits below 55 percent. PMID: 6402930, UI: 83149913 _________________________________________________________________ Surgery 1980 Nov;88(5):686-92 Increased oxygen uptake following phlebotomy and simultaneous fluid replacement in polycythemic patients.
Shah DM, Powers SR Jr, Bernard HR, Scovill WA, Newell JC, Stratton HH To study the isolated effects of decreased hemoglobin concentration without volume loss, eight patients with the diagnosis of polycythemia were studied following acute phlebotomy and simultaneous volume replacement. These patients had been treated previously by repeated phlebotomy, without volume replacement, to a hemoglobin level of 14.8 +/- 0.5 gm%. Following hemodilution by additional phlebotomy and volume replacement, which further lowered the mean hemoglobin level to 11.4 +/- 0.4 gm%, cardiac index increased significantly from 2.8 +/- 0.3 to 3.5 +/- 0. 3 liter/min/m(2) (P<0.05), oxygen delivery did not change, but total body oxygen consumption increased significantly from 140 +/- 16 to 180 +/- 15 ml/min/m(2) (P<0.05). Mixed venous PO2, systemic and pulmonary vascular resistance decreased significantly (P<0.05). Vascular pressure, heart rate, intrapulmonary shunt, arterial pH and bicarbonate, limb blood flow, limb oxygen delivery and limb oxygen consumption did not change. Thus, with phlebotomy and fluid replacement, a reduction of hemoglobin concentration to a subnormal level increased oxygen consumption without lowering oxygen delivery. PMID: 7434209, UI: 81056744 _________________________________________________________________
Who loves ya. Tom
 Signature Jesus Was A Vegetarian! http://jesuswasavegetarian.7h.com Man Is A Herbivore! http://pages.ivillage.com/ironjustice/manisaherbivore DEAD PEOPLE WALKING http://pages.ivillage.com/ironjustice/deadpeoplewalking
ARoberts - 20 Nov 2003 06:47 GMT > >Subject: Re: Effects of phlebotomy > >From: Colin Campbell activated_95b@earthlink.net(remove underscore) [quoted text clipped - 18 lines] > > Dig .. ? What a mental case.
doe - 20 Nov 2003 06:56 GMT >Subject: Re: Effects of phlebotomy >From: "ARoberts" a-roberts1@comcast.net [quoted text clipped - 26 lines] > >What a mental case. Step up .. big guy .. so I can knock you down ..
In the meanwhile .. just .. F .. O ..
Like a good little man ..
http://asthma.about.com/library/weekly/aa112999a.htm
<<snip>> Asthma falls into a category of diseases known as COPD, which stands for Chronic Obstructive Pulmonary Disease <<snip>> ------------------------------------------------------------
Seems erythrocytosis .. too many red blood cells .. and polycythemia .. are .. the same ..
The marker used to assess polycythemia {too many red blood cells] is set by .. cost.
The higher the marker {red blood cells] to eliminate 'false positives' ..
So .. do YOU have the iron levels of a pre-menopausal woman?
You know that .. anemic .. one .. ?
THAT is the level research has shown to be the healthiest.
--------------------------------------------------------- Thus, although individuals at high risk for ASCVD are not Fe-overloaded, they seem to benefit, metabolically and hemodynamically, from lowering of body Fe to levels commonly seen in premenopausal females.
PMID: 12079862 --------------------------------------------------------
Chest 1990 Nov;98(5):1073-7 Exercise performance of polycythemic chronic obstructive pulmonary disease patients. Effect of phlebotomies.
Chetty KG, Light RW, Stansbury DW, Milne N Department of Medicine, VA Medical Center, Long Beach, CA 90822. The purpose of this study was to determine the effects of phlebotomy on the exercise tolerance and right and left ventricular ejection fraction of polycythemic patients with chronic obstructive pulmonary disease. Ten patients with COPD (mean FEV1 = 1.32 +/- 0.55 L) and polycythemia (mean Hct = 62 +/- 3 percent) were studied before and after their hematocrits had been reduced to approximately 50 percent. Post-phlebotomy the maximal oxygen consumption increased from 1.09 +/- 0.34 L/min to 1.26 +/- 0.43 L/min (p less than 0.05) and the maximum workload increased from 56.5 +/- 32.6 watts to 74.5 +/- 23.4 watts (p less than 0.05). The increase in the exercise tolerance appeared to be primarily due to an increased cardiac output at Emax. There was no relationship between the increases in the upright exercise capacity and changes in the supine ejection fractions of the right or left ventricular either at rest or during exercise. PMID: 2225946, UI: 91030710 _________________________________________________________________ Int J Cardiol 1994 Apr;44(2):175-7 Effects of phlebotomy on a patient with secondary polycythemia and angina pectoris.
Piccirillo G, Fimognari FL, Valdivia JL, Marigliano V Cattedra di Geriatria e Gerontologia Universita, La Sapienza, Rome, Italy. A 67-year-old man with polycythemia, secondary to chronic obstructive pulmonary disease, had angina attacks at rest treated successfully by supplementing conventional therapy with frequent phlebotomies. Although phlebotomy reduces arterial oxygen content, it also decreases blood viscosity, improves peripheral oxygen consumption and thus yields the clinical benefit. PMID: 8045664, UI: 94321077 _________________________________________________________________
Respiration 1979;38(6):305-13 Phlebotomy improves pulmonary gas exchange in chronic mountain polycythemia.
Cruz JC, Diaz C, Marticorena E, Hilario V There is not unanimous agreement in the literature regarding the effects of bleeding on pulmonary gas exchange in polycythemic patients. Spirometry, alveolar arterial O2 and CO2 tension differences, PaO2 breathing 100% oxygen and carbon monoxide-diffusing capacity were measured before and after 1 week of chronic phlebotomy in 4 chronic mountain polycythemic patients. Studies were carried out at 3,700 m above sea level (PB = 491 mm Hg). Before phlebotomy, 2 patients showed abnormal spirometry and gas exchange. Only 1 patient had high PaCO2 and all of them showed low values of PaO2 breathing oxygen. Phlebotomy improved both spirometry and gas exchange. Improvement in arterial oxygen saturation and PaO2 could not be attributed to changes in alveolar ventilation, but rather to better distribution of VA/Qc ratios since physiological dead space decreased. Our results are similar to those reported in polycythemia vera patients. A significant correlation between the changes in PaO2 with phlebotomy and the control PaO2 have been found from 45 polycythemic patients with chronic obstructive pulmonary disease collected from the literature. It is concluded that excessive polycythemia worsened hypoxemia and that phlebotomy improved gas exchange. PMID: 538338, UI: 80146854 _________________________________________________________________ Am J Med 1983 Mar;74(3):415-20 Improved exercise tolerance of the polycythemic lung patient following phlebotomy.
Chetty KG, Brown SE, Light RW The present study evaluated the effects of therapeutic phlebotomy on the exercise tolerance and the maximal carbon dioxide output of polycythemic patients with chronic obstructive pulmonary disease. Fifteen maximal exercise studies were performed before and after phlebotomy in patients with moderate to severe chronic obstructive pulmonary disease (mean forced expiratory volume in one second [FEV1]= 970 ml). After phlebotomy there were no significant differences in pulmonary function, blood gases, oxygen consumption, or carbon dioxide production at rest. However, after phlebotomy there was a significant increase in the exercise tolerance of the patients. The mean workload, the duration of exercise, the maximal oxygen consumption, the maximal carbon dioxide production, and the ventilation at maximal exercise all increased significantly. The improved exercise tolerance after phlebotomy appeared due to an increased cardiac output generated mainly through an increased stroke volume. We hypothesize that the increased stroke volume was due to a higher ejection fraction of the right ventricle secondary to a lower pulmonary artery pressure. This study provides further evidence that patients with chronic obstructive pulmonary disease who have polycythemia benefit by therapeutic interventions that maintain their hematocrits below 55 percent. PMID: 6402930, UI: 83149913 _________________________________________________________________ Surgery 1980 Nov;88(5):686-92 Increased oxygen uptake following phlebotomy and simultaneous fluid replacement in polycythemic patients.
Shah DM, Powers SR Jr, Bernard HR, Scovill WA, Newell JC, Stratton HH To study the isolated effects of decreased hemoglobin concentration without volume loss, eight patients with the diagnosis of polycythemia were studied following acute phlebotomy and simultaneous volume replacement. These patients had been treated previously by repeated phlebotomy, without volume replacement, to a hemoglobin level of 14.8 +/- 0.5 gm%. Following hemodilution by additional phlebotomy and volume replacement, which further lowered the mean hemoglobin level to 11.4 +/- 0.4 gm%, cardiac index increased significantly from 2.8 +/- 0.3 to 3.5 +/- 0. 3 liter/min/m(2) (P<0.05), oxygen delivery did not change, but total body oxygen consumption increased significantly from 140 +/- 16 to 180 +/- 15 ml/min/m(2) (P<0.05). Mixed venous PO2, systemic and pulmonary vascular resistance decreased significantly (P<0.05). Vascular pressure, heart rate, intrapulmonary shunt, arterial pH and bicarbonate, limb blood flow, limb oxygen delivery and limb oxygen consumption did not change. Thus, with phlebotomy and fluid replacement, a reduction of hemoglobin concentration to a subnormal level increased oxygen consumption without lowering oxygen delivery. PMID: 7434209, UI: 81056744 _________________________________________________________________
Who loves ya. Tom
 Signature Jesus Was A Vegetarian! http://jesuswasavegetarian.7h.com Man Is A Herbivore! http://pages.ivillage.com/ironjustice/manisaherbivore DEAD PEOPLE WALKING http://pages.ivillage.com/ironjustice/deadpeoplewalking
ARoberts - 21 Nov 2003 06:25 GMT > >Subject: Re: Effects of phlebotomy > >From: "ARoberts" a-roberts1@comcast.net [quoted text clipped - 28 lines] > > Step up .. big guy .. so I can knock you down .. You don't pack the gear, mouth-man.
Bob - 20 Nov 2003 14:20 GMT >> Dig .. ?
>> Dig .. ? http://www.psychologyhelp.com/thnk87.htm
doe - 20 Nov 2003 14:54 GMT Seems erythrocytosis .. too many red blood cells .. and polycythemia .. are .. the same ..
The marker used to assess polycythemia {too many red blood cells] is set by .. cost.
The higher the marker {red blood cells] to eliminate 'false positives' ..
So .. do YOU have the iron levels of a pre-menopausal woman?
You know that .. anemic .. one .. ?
THAT is the level research has shown to be the healthiest.
--------------------------------------------------------- Thus, although individuals at high risk for ASCVD are not Fe-overloaded, they seem to benefit, metabolically and hemodynamically, from lowering of body Fe to levels commonly seen in premenopausal females.
PMID: 12079862 --------------------------------------------------------
Chest 1990 Nov;98(5):1073-7 Exercise performance of polycythemic chronic obstructive pulmonary disease patients. Effect of phlebotomies.
Chetty KG, Light RW, Stansbury DW, Milne N Department of Medicine, VA Medical Center, Long Beach, CA 90822. The purpose of this study was to determine the effects of phlebotomy on the exercise tolerance and right and left ventricular ejection fraction of polycythemic patients with chronic obstructive pulmonary disease. Ten patients with COPD (mean FEV1 = 1.32 +/- 0.55 L) and polycythemia (mean Hct = 62 +/- 3 percent) were studied before and after their hematocrits had been reduced to approximately 50 percent. Post-phlebotomy the maximal oxygen consumption increased from 1.09 +/- 0.34 L/min to 1.26 +/- 0.43 L/min (p less than 0.05) and the maximum workload increased from 56.5 +/- 32.6 watts to 74.5 +/- 23.4 watts (p less than 0.05). The increase in the exercise tolerance appeared to be primarily due to an increased cardiac output at Emax. There was no relationship between the increases in the upright exercise capacity and changes in the supine ejection fractions of the right or left ventricular either at rest or during exercise. PMID: 2225946, UI: 91030710 _________________________________________________________________ Respiration 1979;38(6):305-13 Phlebotomy improves pulmonary gas exchange in chronic mountain polycythemia.
Cruz JC, Diaz C, Marticorena E, Hilario V There is not unanimous agreement in the literature regarding the effects of bleeding on pulmonary gas exchange in polycythemic patients. Spirometry, alveolar arterial O2 and CO2 tension differences, PaO2 breathing 100% oxygen and carbon monoxide-diffusing capacity were measured before and after 1 week of chronic phlebotomy in 4 chronic mountain polycythemic patients. Studies were carried out at 3,700 m above sea level (PB = 491 mm Hg). Before phlebotomy, 2 patients showed abnormal spirometry and gas exchange. Only 1 patient had high PaCO2 and all of them showed low values of PaO2 breathing oxygen. Phlebotomy improved both spirometry and gas exchange. Improvement in arterial oxygen saturation and PaO2 could not be attributed to changes in alveolar ventilation, but rather to better distribution of VA/Qc ratios since physiological dead space decreased. Our results are similar to those reported in polycythemia vera patients. A significant correlation between the changes in PaO2 with phlebotomy and the control PaO2 have been found from 45 polycythemic patients with chronic obstructive pulmonary disease collected from the literature. It is concluded that excessive polycythemia worsened hypoxemia and that phlebotomy improved gas exchange. PMID: 538338, UI: 80146854 _________________________________________________________________ Am J Med 1983 Mar;74(3):415-20 Improved exercise tolerance of the polycythemic lung patient following phlebotomy.
Chetty KG, Brown SE, Light RW The present study evaluated the effects of therapeutic phlebotomy on the exercise tolerance and the maximal carbon dioxide output of polycythemic patients with chronic obstructive pulmonary disease. Fifteen maximal exercise studies were performed before and after phlebotomy in patients with moderate to severe chronic obstructive pulmonary disease (mean forced expiratory volume in one second [FEV1]= 970 ml). After phlebotomy there were no significant differences in pulmonary function, blood gases, oxygen consumption, or carbon dioxide production at rest. However, after phlebotomy there was a significant increase in the exercise tolerance of the patients. The mean workload, the duration of exercise, the maximal oxygen consumption, the maximal carbon dioxide production, and the ventilation at maximal exercise all increased significantly. The improved exercise tolerance after phlebotomy appeared due to an increased cardiac output generated mainly through an increased stroke volume. We hypothesize that the increased stroke volume was due to a higher ejection fraction of the right ventricle secondary to a lower pulmonary artery pressure. This study provides further evidence that patients with chronic obstructive pulmonary disease who have polycythemia benefit by therapeutic interventions that maintain their hematocrits below 55 percent. PMID: 6402930, UI: 83149913 _________________________________________________________________
Who loves ya. Tom
 Signature Jesus Was A Vegetarian! http://jesuswasavegetarian.7h.com Man Is A Herbivore! http://pages.ivillage.com/ironjustice/manisaherbivore DEAD PEOPLE WALKING http://pages.ivillage.com/ironjustice/deadpeoplewalking
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