恢复期SARS患者肺功能的改变

目的 观察SARS患者恢复期肺功能状况，评价SARS对患者肺功能的影响。方法 SARS组10例，对照组13例，分别测定肺活量(VC)、用力肺活量(FVC)、一秒钟用力呼气容量与用力肺活量比值(FEVl．0％)、25％～50％肺活量位最大呼气流量(V25％～50％)、残气量(RV)和肺一氧化碳弥散量(DLCO)。结果 SARS组VC、FVC和DLCO均显著低于对照组。结论 SARS患者肺功能受到损害，主要以限制性通气功能障碍和弥散功能损害为特征。对SARS患者作肺功能检查能及时了解和评估患者的肺功能状况。     

恢复期SARS患者肺功能的改变

目的　观察SARS患者恢复期肺功能状况,评价SARS对患者肺功能的影响。方法 SARS组10例,对照组13例,分别测定肺活量(VC)、用力肺活量(FVC)、一秒钟用力呼气容量与用力肺活量比值(FEV1.0%)、25%～50%肺活量位最大呼气流量(V25%～50%)、残气量(RV)和肺一氧化碳弥散量(DLCO)。结果 SARS组VC、FVC和DLCO均显著低于对照组。结论 SARS患者肺功能受到损害,主要以限制性通气功能障碍和弥散功能损害为特征。对SARS患者作肺功能检查能及时了解和评估患者的肺功能状况。     

肺泡蛋白沉着症肺功能检查特点:附27例分析

目的 肺泡蛋白沉着症(PAP)在临床上极为罕见,其肺功能检查特点的报道也极少,本研究目的在于探讨肺功能检查在PAP诊断和治疗中的价值.方法 回顾性分析本院呼吸疾病研究所经肺组织病理(过碘酸雪夫反应阳性)确诊的27例PAP患者的临床资料.全部病例均给予肺通气和弥散功能测试,其中12例进行了肺容积测试.比较了10例行支气管肺泡灌洗(BAL)治疗的患者在灌洗前、后肺功能的改变情况.结果 27例患者入院后的基础通气肺功能情况:用力肺活量(FVC):(79.67±16.21)%;第1秒用力呼气容积(FEV1):(83.94±16.07)%,一秒率(FEV1/FVC):(89.20±5.50)%;最大呼气流量(PEF):(107.64±17.73)%;肺一氧化碳弥散量(DLCO):(49.27±21.83)%;DLCO与肺泡通气量比值(DLCO/VA):(69.92±20.11)%.肺总量(TLC):(80.60±19.56)%;残气容积(RV):(86.03±38.10)%;残总比(RV/TLC):(32.73±9.48)%;功能残气量(FRC):(84.91±28.08)%.27例患者基础肺功能下降的异常率:FVC:55.6%(15例);FEV1:44.4%(12例);FEV1/FVC:0%(0例);PEF:3.7 %(1例);DLCO:88.9%(24例);DLCO/VA:70.4%(19例).12例患者肺容积的异常率:TLC下降者占50%(6例);RV下降者占41.7%(5例),升高者占16.7%(2例);RV/TLC升高者占50%(6例);FRC下降者占33.3%(4例).10例进行BAL治疗的患者术后肺功能改善率:FVC:5.47%;FEV1:5.50%;DLCO:31.07%;DLCO/VA:20.35%.灌洗前后DLCO及DLCO/VA差异有统计学意义(t=-3.551,-3.159;P=0.006,0.012).结论 PAP的肺功能检查以肺限制性通气功能障碍及肺弥散功能障碍为常见,尤其为弥散功能障碍.PAP经BAL治疗后肺弥散功能有显著性改善.     

天津地区严重急性呼吸综合征患者康复10年后肺功能状态

目的 评估严重急性呼吸综合征(SARS)患者康复10年后的肺功能恢复状况及SARS对患者肺功能的影响.方法 对本院2003年确诊为SARS的25例康复患者进行肺功能检测,分别测定肺总量、残气量、肺活量、用力肺活量(FVC)、FEV1、FEV1/FVC和肺一氧化碳弥散量(DLCO),并与2003年初始恢复期的肺功能指标进行自身对比.25例中男3例,女22例,年龄31 ～ 69岁,平均(45.8±12.2)岁.选取同期25名健康成人体检者,男6名,女19名,年龄31 ～ 62岁,平均(42.3±11.9)岁,对二者的肺功能指标进行对比分析.结果 25例中单纯弥散障碍2例,单纯限制性通气功能障碍2例,弥散障碍合并限制性通气功能障碍11例,弥散障碍合并阻塞性通气功能障碍1例.肺功能无异常患者10例.10年后和10年前主要的肺功能指标DLCO为(73±12)％和(72±15)％,FEV1/FVC为(83±11)％和(85±7)％,FEV1为(88±7)％和(86±14)％,FVC为(87±21)％和(87±17)％、残气量为(100±17)％和(78±30)％,各项指标比较差异均无统计学意义(均P＞0.05),同时与健康体检者比较差异均无统计学意义(均P＞0.05).结论 SARS患者康复10年后肺通气功能基本恢复正常,肺功能损害以弥散及限制性通气功能障碍为特征.     

对2型糖尿病患者肺功能变化及其相关因素的临床分析

目的分析2型糖尿病患者肺功能变化的影响因素。方法选取该院2018年10月—2019年5月期间收治的62例2型糖尿病患者以及同期于该院接受体检的60名健康体检者作为研究对象,分别作为观察组和对照组,对比两组受检者各项肺功能指标的差异,分析糖化血红蛋白(HbA1c)水平、微血管并发症积分以及胰岛素抵抗指数(HOMA-IR)对于肺功能变化的影响。结果与对照组健康体检者相比,观察组2型糖尿病患者的肺活量(VC)、1 s用力呼气容积(FEV1)、肺总量(TLC)、最大自主通气量(MVV)、肺一氧化碳弥散量(DLCO)、肺单位体积一氧化碳弥散量(KCO)相对更低,差异有统计学意义(P<0.05)。在62例2型糖尿病患者中,HbA1c>8.5%、微血管并发症积分>2分以及HOMA-IR>2患者的VC、FEV1、TLC、DLCO以及KCO等指标相对更低,差异有统计学意义(P<0.05)。结论根据2型糖尿病患者的HbA1c水平、微血管并发症积分以及HOMA-IR,准确判断肺通气功能及弥散功能减退的实际情况,能够为肺部并发症的防治提供参考。     

2型糖尿病患者的肺功能损害及其相关因素分析

目的研究T2DM患者的肺功能损害及其影响因素。方法选取我院100例诊断为T2DM的患者及40名健康志愿者,检测肺功能及动脉血气进行对照研究,并以肺功能各项指标与FPG、胰岛素敏感性指数（ISI）、HbA1c、BMI和糖尿病病程等进行多因素线性回归分析。结果（1）T2DM组BMI明显高于对照组（P〈0．01）。（2）T2DM组肺总量（TLC）、用力肺活量（FVC）、1秒用力呼气量（FEV1）、用力呼出气量为50％肺活量的最大呼气中期流量（MMEF50）、用力呼出气量为25％肺活量的最大呼气中期流量（MMEF25）明显低于对照组（P〈0．01）。T2DM组一氧化碳弥散量（DLCO）、弥散指数（DLCO／VA）、动脉血氧分压（PaO2）和血氧饱和度（SaO2）低于对照组（P〈0．01）。（3）TLC、FVC、FEV1、MMEF50与FPG、2hPG、FC-P、2hC-P、HbA1c、BMI、ISI、病程无明显相关;但DL（如、DLCO／VA、MMEF25与FPG、2hPG、FC-P、2hC-P、HbA1c、BMI、病程呈显著负相关（P〈0．05或P〈0．01）,与ISI呈显著正相关（P〈0．05）。结论（1）T2DM患者肺功能损害主要表现为限制性通气功能障碍、小气道功能减退和弥散功能异常。（2）FPG、2hPG、FC-P、2hC-P、HbA1c、BMI、病程、ISI与T2DM小气道损害和肺弥散功能障碍密切相关。     

重症急性呼吸综合征患者康复期肺功能变化临床观察

目的　通过观察重症急性呼吸综合征 (SARS)患者康复期肺功能的变化 ,了解SARS患者是否遗留有肺功能的长期损害。方法　对 82例SARS患者出院 3个月后进行肺功能检查 (实验组 ) ,并对肺功能异常者出院6个月后再次行肺功能检查 ,并以 2 8例健康人的肺功能做为对照组进行比较分析。结果　实验组肺功能检测发现一氧化碳弥散量 (DLCO % )为 (78 4± 17 4 ) % ,对照组为 (93 8± 13 6 ) % (P <0 0 1)。出院后 3及 6个月实验组中分别有 4 6例和 30例存在弥散功能障碍 (DLCO % <80 % ) ,37例和 16例有小气道功能障碍 ,2 8例和 11例残总比增加 (RV/TLC >35 % ) ,9例和 5例有限制性通气功能障碍。按照患者住院期间胸片肺部阴影的范围 ,将患者分为轻、中、重 3组 ,其轻重程度与出院后 3个月及 6个月肺弥散功能损害呈正相关。重症患者使用机械通气治疗组与未使用机械通气治疗组肺功能损害差异不明显。结论　SARS患者治愈出院 3个月及 6个月后 ,部分患者遗留有肺功能损害 ,主要以弥散功能障碍为主 ,少数有小气道阻塞、残气增加和限制性通气功能障碍。     

风湿性肺炎的小气道功能障碍

一般认为特发性间质性肺疾患肺活量(VC)及总肺活量(TLC)减少,余气量(RV)增加。本文对风湿性肺炎肺功能特征的分析.探讨小气道功能障碍。 方法 患者16例(男3,女13),平均年龄51.4(26     

糖尿病引起肺功能损害的早期改变

目的　探讨糖尿病导致肺功能损害的早期改变。方法　采用日本产ChestGraphHZ 70 1型体积容积描记肺功能仪检测 68例糖尿病患者的肺功能。结果　糖尿病组的肺通气功能有明显改变 ,肺活量、用力肺活量、一氧化碳弥散量和每升肺泡通气量与对照组比较均有显著性差异(P <0 .0 1)。结论　糖尿病患者引起肺功能的早期改变以弥散功能损害为主     

肺泡蛋白沉着症患者的肺功能与胸部分辨率CT的相关性

目的 探讨PAP患者的肺功能与高分辨率CT定量测量指标之间的相关性.方法 对2004至2007年在广州医学院第一附属医院呼吸疾病研究所住院的17例PAP患者(男10例,女7例,年龄15～51岁)进行肺通气及弥散功能检查和高分辨率CT检查,分析肺功能指标与高分辨率CT定量指标之间的相关性.比较其中6例行全肺肺泡灌洗治疗前、后的肺功能和高分辨率CT定量指标的变化.采用SPSS 13.0软件进行数据处理,结果 以x±s表示.结果 PAP患者的肺功能检查结果 以限制性通气功能障碍和弥散功能下降为主,弥散功能下降更为显著,DLCO占预计值%为(46±22)%,异常率为94.1%.肺功能检查结果 与高分辨率CT定量检查结果 之间存在一定的相关性,其中平均肺密度与FVC、肺重量与FEV1、肺含气容积比与呼气峰流量、DL.CO、DLCO与肺泡通气量比值(DLCO/VA)等指标的改变差异有统计学意义,(r值分别为-0.469、-0.482、0.511、0.659、0.692,均P<0.05),在所有指标中以肺含气容积比与DLCO/VA关系最为密切.6例肺泡灌洗术治疗的患者术后肺功能和高分辨率CT定量测量指标有所改善.结论 PAP的肺功能和胸部高分辨率CT改变之间存在相关性.2项检查同时进行可作为PAP患者随访的重要参考指标.     

慢性阻塞性肺疾病和结缔组织病患者膜弥散与肺血管床容 …

目的 研究慢性阻塞性肺疾病（ＣＯＰＤ）和结缔组织病患者静息及运动后即刻的肺弥散能力（ＤＬ）、肺泡毛细血管膜弥散能力（Ｄｍ）肺泡毛细血管床容量（Ｖｃ）的变化，探讨其对结缔组织病肺改变早期诊断的意义。方法 ＣＯＰＤ组（２０例）及正常对照组２０名，结缔组织病组（２０例）及正常对照组２０名测定静息时不同肺泡气氧分压下的ＤＬ及运动后不同肺泡气氧分压下的ＤＬ，分别按Ｒｏｕｇｈｔｏｎ和Ｆｏｒｓｔｅｒ方法计算静息     

Lateral decubitus position generates discomfort and worsens lung function in chronic heart failure

BACKGROUND: Lateral decubitus position is poorly tolerated by heart failure patients. STUDY OBJECTIVES: To evaluated pulmonary function and lung diffusion in heart failure patients in the following five body positions: sitting, prone, supine, and left and right decubitus. SETTING: Heart failure unit of a university hospital. SUBJECTS: We studied 14 chronic heart failure patients in New York Heart Association class III and 14 healthy volunteers. MEASUREMENTS AND RESULTS: After 15 min of a selected position, subjects were evaluated by a discomfort scale, ear oximetry, and pulmonary function, which included FEV1, FVC, vital capacity (VC), alveolar volume, and diffusing capacity of the lung for carbon monoxide (D(LCO)) with subcomponent membrane resistance (DM) and capillary volume. In healthy subjects, we observed a reduction of D(LCO) and capillary volume in both lateral decubiti. Some discomfort was documented in both lateral decubiti when selected positions were compared with the sitting position. In the sitting position, pulmonary function suggested slight restriction ([mean +/- SD] FVC, 89.8 +/- 22.3% predicted; FEV1, 84.7 +/- 16.9% predicted, VC, 88.6 +/- 21.5% predicted; and FEV1/VC, 74 +/- 7) with low D(LCO) (73 +/- 19% predicted). Compared with sitting, lung mechanics were unchanged in prone and supine positions; FEV1, FVC, and FEV1/VC were lower when patients were lying on their side, with unchanged alveolar volume and VC. D(LCO) was similar when comparing sitting, prone, and supine positions, and it was lower in lateral decubitus because of the lower capillary volume (vs sitting) and DM (vs prone and supine). Body position-related FVC and D(LCO) reduction were greatest in the largest hearts (deltaFVC and deltaD(LCO) vs left ventricle diastolic volume R = 0.524, p < 0.05 and R = 0.630, p < 0.02, respectively; deltaFVC and deltaD(LCO) vs cardiothoracic index R = 0.539, p < 0.05 and R = 0.685, p < 0.01, respectively). CONCLUSIONS: In heart failure, lateral decubitus airway obstruction and lung diffusion impairment become greater as heart dimensions increase.     

结缔组织病合并肺动脉高压及肺间质病变的肺功能分析

目的 比较和分析不同结缔组织病(CTD)相关肺部病变患者组间各项肺功能指标的差异.探讨肺功能检查对于评价CTD肺部病变性质和程度的临床意义.方法 前瞻性纳入CTD肺脏受累患者,根据肺部病变性质分为3组:CTD合并肺动脉高压组(CTD-PAH)29例、合并肺间质病变组(CTD-ILD))35例、合并PAH及ILD组(CTD-PAH+ILD)16例;另纳入无肺部病变的CTD患者34例作为对照组.比较各组间肺总量占预计值百分比(TLC%)、用力肺活量占预计值百分比(FVC%)、第1秒用力呼气量占预计值百分比(FEV_(1.0)%)、FEV_(1.0)/FVC、一氧化碳弥散量占预计值百分比(DLco%)、弥散率(DLco/VA)等主要肺功能指标的差异.结果 共114例患者纳入本研究,以女性多见,平均年龄35～39岁,易合并肺部病变的CTD依次为:混合性结缔组织病(MCTD)、系统性硬化症(SSc)、系统性红斑狼疮(SLE)和原发性干燥综合征(pSS).CTD-PAH组、CTD-ILD组和CTD-PAH+ILD组分别有10%、29%和46%的患者出现TLC下降;分别有50%、36%和71%的患者出现FVC%下降;分别有54%、47%和71%的患者出现FEV_(1.0)%下降;分别有100%、82%和100%的患者出现DLco%下降.多组间样本比较分析发现TLC%、FVC%、FEV_(1.0)%、DLco%在CTD对照组与CTD合并各肺部病变组之间的差异均有统计学意义(P＜0.05),而在CTD-ILD组与CTD-PAH组间差异均无统计学意义.TLC%在CTD-PAH组大于CTD-PAH+ILD组[(89±15)%与(79±12)%,P＜0.05)];FVC%在CTD-PAH组或CTD-ILD组均大于CTD-PAH+ILD组[(81±13)%、(80±16)%与(65±22)%,P＜0.05)].结论 肺功能检查对于筛查CTD合并的各种肺部病变具有临床应用价值,常表现为限制性通气功能障碍和弥散功能障碍,但从单次数值上无法鉴别CTD肺部病变种类(PAH与ILD).     

Lung function in children and adolescents with idiopathic interstitial pulmonary fibrosis

Lung function of 65 patients who had idiopathic interstitial pulmonary fibrosis (IIPF) that had been treated with prednisone was evaluated by tests of ventilatory function, lung mechanics, and gas exchange at rest and during exercise. Ages on initial investigation ranged from 5 to 20 years. In 35 of 65 patients the studies were repeated an average of four times over a period of 1 to 9 years. Results of the first testing were as follows: vital capacity (VC)-significantly reduced in all patients; inspiratory capacity (IC)-significantly reduced in all patients; total lung capacity (TLC)-reduced in 91%; functional residual capacity (FRC)-reduced in 31%; residual volume (RV)-reduced in 6%; elastic recoil of the lungs (Pstl)-significantly increased in 97% at 100% TLC, significantly increased in 52% at 90% TLC, reduced in 68% at 60% TLC; 7) static compliance (Cst)-reduced in 83%; 8) dynamic compliance (Cdyn)-reduced in 88%; 9) specific airway conductance at FRC level (Gaw/TGVex)-significantly increased in 50%; 10) maximum expiratory flow rates at 60% TLC (Vmax 60% TLC, in TLC/s)-significantly reduced in 33%; 11) upstream airway conductance (Gus 60% TLC, in TLC/s/cm H2O)-reduced in 32%; 12) diffusing capacity of the lungs for carbon monoxide (DLco) related to body-surface area-abnormal in 58% (when corrected for lung size, i.e., DLco/TLC, abnormal in only 8%); 13) PaO2 at rest and after 6 minutes submaximal exercise-reduced in 25% and 63%, respectively. Changes in lung function that occurred with growth were assessed in terms of percentages of predicted values. Results showed that the VC and IC remained significantly reduced. An actual reduction of TLC, FRC, RV, breathing frequency, DLCO, and Pstl at 100% and 90% TLC was observed. Increases were seen in Pstl at 60% TLC, Gaw/TGVex, Vmax, and Cst. Indices of lung elasticity suggested that regions of fibrosis and emphysema had become present. Smaller patients were also noted to have stiffer lungs.     

Pulmonary involvement in systemic lupus erythematosus.

Several series have suggested that pulmonary function abnormalities are common in systemic lupus erythematosus. However, only isolated studies have attempted to relate these abnormalities to immunological aspects of the diseases. In the present study respiratory symptoms, pulmonary function tests, and immunological data were reviewed in 22 patients with systemic lupus erythematosus. Seventeen subjects had either clinical evidence or abnormalities of lung function suggestive of pulmonary involvement. A restrictive ventilatory defect or reduction in pulmonary diffusing capacity for carbon monoxide was demonstrated in 14 of the patients only 4 of whom were dyspnoeic. There was no correlation between pulmonary involvement, co-existent renal lupus, and immunological abnormality.     

结节病患者肺功能与支气管肺泡灌洗液细胞学关系的研究

目的 探讨结节病患者不同影像分期之间肺功能指标、支气管肺泡灌洗液细胞学的改变以及两者的相关性.方法 回顾性调查71例结节病患者肺功能以及支气管肺泡灌洗液检查的资料.结果 在结节病患者不同影像分期之间肺功能指标用力肺活量(FVC)占预计值%、第1秒用力呼气容积(FEV1)占预计值%、肺总量(TLC)占预计值%以及肺一氧化...     

Carbon monoxide diffusing capacity as predictor of outcome in systemic sclerosis

In order to determine the predictive value of lung function studies for subsequent prognosis in systemic sclerosis, 71 patients with systemic sclerosis were followed up for a mean of five years after pulmonary function testing. A carbon monoxide diffusing capacity less than or equal to 40 percent of the predicted reference value was associated with only a 9 percent five-year cumulative survival rate compared with a 75 percent cumulative five-year survival in patients with a carbon monoxide diffusing capacity greater than 40 percent of predicted. An obstructive ventilatory defect was also associated with increased mortality, and all six patients with obstruction and a diffusing capacity less than 70 percent of the predicted died during the study period. Male gender, independent of abnormalities of pulmonary function, was also associated with a poor prognosis. Although it is not clear whether a severely impaired diffusing capacity is indicative of interstitial pulmonary fibrosis or pulmonary vasculopathy or is a marker of generalized vascular disease, a severely depressed carbon monoxide diffusing capacity is an important predictor of mortality in patients with systemic sclerosis.     

Respiratory muscle function and hypoxic ventilatory control in patients with type I diabetes.

STUDY OBJECTIVES: The interaction among pulmonary mechanics, respiratory muscle performance, and ventilatory control in subjects with insulin-dependent diabetes mellitus has so far received little attention. We therefore decided to assess the role of central factors and peripheral factors on the ventilatory response to a hypoxic stimulus in type I diabetic patients. SUBJECTS: Eight patients in stable condition aged 19 to 48 years old, with insulin-dependent diabetes mellitus (duration of the disease, 36 to 240 months) and no history of smoking, cardiopulmonary involvement, or autonomic neuropathy; and an age- and gender-matched control group. MEASUREMENTS: In each patient, we measured the following: pulmonary volumes; diffusing capacity of the lung for carbon monoxide (D(LCO)); time and volume components of ventilation (tidal volume [V(T)] and respiratory frequency); static compliance (Clstat) and dynamic compliance (Cldyn); swings in pleural pressure (Pes) and gastric pressure (Pg); and transdiaphragmatic pressure (Pdi), obtained by subtracting Pes from Pg. Maximal inspiratory Pes and Pdi during a maximal sniff maneuver were also measured. Swings in Pes and Pdi during V(T) as a percentage of Pes and Pdi during the maximal sniff maneuver [Pessw(%Pessn) and Pdisw(%Pdisn), respectively] were both considered as a measure of central respiratory output, and the Pessw(%Pessn)/V(T) ratio was considered as an index of neuroventilatory dissociation (NVD) of the inspiratory pump. Subjects were studied at baseline and during hypoxic rebreathing. RESULTS: Pulmonary volumes and D(LCO) were normal or slightly reduced. A lower Cldyn, higher central respiratory output, and NVD were found. During hypoxic rebreathing, patients had lower V(T), similar central respiratory output, and greater NVD per unit change in arterial oxygen saturation compared with values in control subjects. An increase in dynamic elastance, computed as 1/Cldyn, during hypoxia was found in patients, but not in normal subjects, and was directly related to concurrent changes in NVD. CONCLUSIONS: We have shown that the assessment of a normal Clstat and normal routine parameters of airway obstruction does not permit the definite exclusion of the role of peripheral airway involvement in insulin-dependent diabetes mellitus. Peripheral airway involvement is likely to influence indices of hypoxic ventilator) drive by modulating a normal central motor output into a rapid and shallow pattern of ventilatory response.     

Pulmonary function tests in children with beta-thalassemia major

Lung function abnormality is a known complication of thalassemia, but the results of studies in pulmonary function have been inconsistent. This study was conducted to describe the type of lung impairment in thalassemic children. Pulmonary function tests were conducted in 40 children with beta-thalassemia major, 23 males and 17 females. Tests included spirometry, total lung capacity (TLC), single breath diffusing capacity of the lung for carbon monoxide (DL(CO)) and arterial blood gases. Serum ferritin level was measured in all children to study its relationship to lung function impairment. A predominantly restrictive pattern was seen in 14 patients (35%). These patients had a significant reduction in RV, FVC, TLC and PEF with an FEV1/FVC ratio of more than 75%. Obstructive airway disease was found in six patients (15%), with an FEV1/FVC ratio less than 75%, increased RV and reduced FEF(25%-75%). Impairment of diffusion was found in 10 patients (25%), with DL(CO) reduced to less than 80% of the predicted value. Arterial blood gases results showed that no patient was hypoxic. No correlation was found between the severity of restrictive or obstructive disease and the serum ferritin level. There was a significant linear correlation between age and serum ferritin level (P < 0.019). Patients with thalassemia have a predominantly restrictive lung dysfunction pattern. This may be due to pulmonary parenchymal pathology, although the reason for the obstructive pattern seen in a small proportion of patients remains obscure.     

Improvement in pulmonary function in mitral stenosis after percutaneous transvenous mitral commissurotomy

Before and after percutaneous transvenous mitral commissurotomy (PTMC), pulmonary function studies were performed in 25 patients with mitral stenosis, in order to determine the effects of pulmonary hemodynamics on pulmonary function in patients with mitral stenosis. After PTMC, dramatic improvements in pulmonary hemodynamics were seen in all patients. With regard to pulmonary function data, the VC as percent predicted value increased from 87.6 +/- 16.1 percent to 94.7 +/- 14.4 percent (p less than 0.001). Although the ratio of FEV1/FVC was unchanged, the MVV as percent predicted value increased, and the ratio of RV/TLC, CV, and the difference in nitrogen concentration between 750 ml and 1,250 ml of expired volume decreased significantly. According to the maximum expiratory flow-volume curves, V ax 50% and Vmax 25% improved. Despite marked improvements in pulmonary ventilatory function soon after PTMC, the percent predicted diffusing capacity of the lung for carbon monoxide decreased significantly after PTMC. Arterial blood gas data, such as the partial pressure of oxygen and carbon dioxide in arterial blood and the alveolar-arterial differences in partial pressure of oxygen, did not improve within one or two weeks after PTMC. We conclude that in mitral stenosis, the majority of ventilatory function impairments are caused by hemodynamic alterations that are mainly reversible.