Effects of Home Oxygen Therapy on Patients With Chronic Heart Failure
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1 J Cardiol 2001 ; 38: Effects of Home Oxygen Therapy on Patients With Chronic Heart Failure Rio Makoto Tomohiko Yoshihiro Tatsuya Eiichi Yutaka Tetsuya Mitsuhiro KOJIMA, MD NAKATANI, MD SHIROTANI, MD IKEDA, MD KUNIYOSHI, MD TAJIRI, MD FURUTA, MD INATOME, MD YOKOYAMA, MD, FJCC Abstract Objectives. Dyspnea on exertion and/or hypoxemia due to nocturnal respiratory disturbance may occur in patients with stable chronic congestive heart failure. Such patients with respiratory disorder during sleep have a poor prognosis. The effects of treatment with home oxygen therapy on patients with congestive heart failure are unclear when symptoms are stable at rest. This study investigated the effects of home oxygen therapy on patients with stable chronic congestive heart failure. Methods. Thirty-three patients with stable chronic congestive heart failure New York Heart Association functional class and hypoxemia during exercise or sleep were treated with oxygen above the level of 90% SaO 2. The following factors were compared before and after home oxygen therapy: Subjective minimal capacity on exercise metabolic equivalents : METs before and 1 month after patients first became aware of dyspnea on effort using the specific activity scale SAS ; SaO 2 at rest before and 1 month after; and frequency of admission during 1 year due to deterioration of heart failure. Results. After home oxygen therapy, SAS improved from to METs p , and SaO 2 at rest improved from % to % p The frequency of admission was decreased from to times p Conclusions. Home oxygen therapy is effective for improving the symptoms and activity of daily life in patients with chronic heart failure. Home oxygen therapy may prevent the deterioration of heart failure. J Cardiol 2001 ; 38 2 : Key Words Heart failure, treatment chronic, home oxygen therapy Prognosis Quality of life : ; Division of Internal Medicine, Municipal Kasai Hospital, Hyogo ; The First Department of Internal Medicine, Kobe University School of Medicine, Kobe Address for correspondence: NAKATANI M, MD, Division of Internal Medicine, Municipal Kasai Hospital, Yokoo 1 13, Hojo-cho, Kasai, Hyogo Manuscript received December 11, 2000; revised February 23 and April 12, 2001; accepted April 13,
2 82 1 2,3 1 New York Heart Association NYHA 1 arterial oxygen saturation : SaO 2 33NYHA s 3 m %64%88% 57% 45% 63% 43% 64% 75% Table metabolic equivalents : METs Sasayama 4 specific activity scale : SAS 2 1SaO SaO 2 SaO 2 90% 101 SaO 2 4%oxygen desaturation index: ODI 10 dips/hr SaO 2 4% SaO l/min SaO 2 SaO 2 90% 1 3A TO-90-3L t p l/min 6 2.0l/min l/min 9 3.0l/min 1 2 SAS METs METs METs METs METs METs METs METs p
3 83 Table 1 Clinical characteristics of the patients IHD group n 14 VHD group n 11 CM group n 8 Total n 33 Age yr Male/female 11/3 5/6 3/5 20/13 NYHA class s/ m/ / 2/5/7/0 0/5/4/2 1/3/4/0 3/13/15/2 Base disease OMI 5 MR 2 DCM 3 CABG 3 MSR 1 Myocarditis 4 ASR 1 RCM 1 MR AR 2 Echocardiography LVDd mm Fractional shortening % Pulmonary hypertension Medication Beta-blocker ACE-I PDE- inhibitor SaO 2 at rest % SAS METs Frequency of admission times Continuous values are mean SD. : %. IHD ischemic heart disease ; VHD valvular heart disease ; CM cardiomyopathy ; NYHA New York Heart Association ; OMI old myocardial infarction ; MR mitral regurgitation ; DCM dilated cardiomyopathy ; CABG coronary artery bypass grafting ; MSR mitral stenosis and regurgitation ; ASR aortic stenosis and regurgitation ; RCM restrictive cardiomyopathy ; AR aortic regurgitation ; LVDd left ventricular end-diastolic diameter ; ACE-I angiotensin converting enzyme inhibitor ; PDE- phosphodiesterase- ;SaO 2 arterial oxygen saturation ; SAS specific activity scale ; METs metabolic equivalents. Table 2 Effects of home oxygen therapy Before After p value SaO 2 at rest % SAS METs Frequency of admission times Values are mean SD. Abbreviations as in Table 1. Table 2 3SaO % % % % % % % % p ; Table
4 84 1 Fig. 1 Frequency of admission due to deterioration of heart failure during 1 year before and after home oxygen therapy Circle diameter indicates the number of cases. Frequency of admission was increased in 5 cases, decreased in 14, and not changed in p 0.03 Fig Cheyne 5 central sleep apnea-hypopnea syndrome : CSAS CSAS Javaheri CSAS Cheyne- Stokes 1,2, SaO % Hanly Javaheri 14 9,10, ,
5 85 4 SAS 1.6 METs 3 4 METs Sasayama 4 NYHA SAS 5 SAS 6 NYHA Na : : NYHA 33 SaO 2 90% METs SAS 2 1 SaO 2 31 : 1 SAS METs
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