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Biomedical subjects

Roberto Tramarin

Publications and source records attributed to Roberto Tramarin.

At least 19 recordsLinked to original sources

Blunted erythropoietin production and defective iron supply for erythropoiesis as major causes of anaemia in patients with chronic heart failure.

AIMS: Anaemia is often observed in patients with chronic heart failure (CHF), and it may be associated with a worse prognosis. Aim of this study was to identify the individual mechanisms of anaemia in CHF patients. METHODS AND RESULTS: One hundred and forty-eight consecutive patients with haemoglobin concentration <13 g/dL (if males) or <12 g/dL (if females) were enrolled. Factors responsible for anaemia were investigated by evaluating endogenous erythropoietin (Epo) production, serum cytokines levels, body iron status, and iron supply for erythropoiesis. Most patients (57%) presented anaemia of chronic disease and among them, 92% showed evidence of a defective endogenous Epo production. This was indicated by an observed/predicted log(serum Epo) ratio less than 0.8 and/or a defective iron supply for erythropoiesis diagnosed by low transferrin saturation and/or increased value of soluble transferrin receptor. According to regression analysis sex, renal failure, and serum Epo were correlated with anaemia. CONCLUSION: According to our study, about half of anaemic CHF patients showed anaemia of chronic disease with blunted endogenous Epo production and/or a defective iron supply for erythropoiesis. Determination of the individual mechanisms of anaemia in CHF could justify a rational therapeutic approach to anaemia.

Anemia↗

Scar detection by contrast-enhanced magnetic resonance imaging in chronic coronary artery disease: a comparison with nuclear imaging and echocardiography.

We compared contrast-enhanced MRI (CeMRI) with the most widely used imaging techniques for myocardial infarct (MI) diagnosis, SPECT and Echo, in unselected patients with chronic coronary artery disease (CAD). Two blinded operators assessed scars on MRI, SPECT and Echo images using a 16-segments LV model. We studied 105 consecutive patients: 50 had Q-wave MI (Q-MI), 19 non Q-wave MI or rest angina (nonQ-MI/RA) and 36 effort angina (EA) history. CeMRI was positive, respectively, in 96%, 37%, and 6%, SPECT in 90%, 53%, and 44%, and Echo in 84%, 32%, and 28% of patients (within Q-MI: CeMRI vs. SPECT p < 0.03, vs. Echo p < 0.001; within EA CeMRI vs. SPECT and ECHO p < 0.001; all trends p < 0.001, pseudo r-square: 0.56-0.75 for CeMRI, 0.18-0.28 for SPECT and 0.23-0.37 for Echo). CeMRI and SPECT agreed in 83 patients (79%); negative SPECT with 1 +/- 0 segments subendocardial delayed enhancement (DE) was found in 4 (4%); negative CeMRI with 4 +/- 3 segments perfusion defects in 18 (17%), 16 of whom were obese or showed LBB or sub-occlusion of related coronary. CeMRI and Echo agreed in 78 patients (75%); negative Echo with 2 +/- 1 segments subendocardial DE was found in 13 (12%) and negative CeMRI with 11 +/- 7 segments kinetic abnormalities in 14 (13%), in 10 confirmed by Cine-MRI. In Q-MI, CeMRI detects DE more frequently than perfusion defects and, especially, kinetic abnormalities are found by SPECT and Echo, respectively. CeMRI identifies small areas of DE also in some patients with nonQ-MI or RA but usually not in patients with EA. This biologically plausible decreasing trend is shown by CeMRI more clearly than by SPECT and Echo. Disagreement between CeMRI and SPECT or Echo may be reduced, but perhaps not fully eluded, performing dobutamine Echo and SPECT after maximal epicardial coronary dilatation.

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[A new test (VITTORIO Test) for functional fitness assessment in rehabilitation after cardiac surgery].

An adequate assessment of physical function (PF) in Cardiac Rehabilitation (CR) plays a central role in early detection of physical limitations. Traditionally exercise tolerance has been used as an indicator of overall PF. However exercise tolerance has been shown to poorly predict patients' ability to perform daily-life activities. The goal of the present study is to evaluate a new test, named VITTORIO TEST, for assessing various component of daily activities among patients in CR after cardiac surgery. VITTORIO test consists in 8 items that assess lower and upper extremity strength and flexibility, agility, dynamic balance, aerobic capacity. 500 patients (359 males; 141 females) admitted to CR programs following cardiac surgery (349 coronary artery bypass surgery; 151 valvular surgery) were enrolled in the study. They were evaluated with an initial test (T1) (10.7 +/- 6.3 days after cardiac surgery) and a final test (T2) after an in-hospital intensive training program (mean length 16.8 +/- 6.6 days) consisting in stretching, large muscle group and aerobic activity, resistance exercises. Statistical analysis showed a significant improvement of all items at the end of the rehabilitation program. Old patients (>70 years) and particularly females demonstrate exercise improvement comparable to that of younger subjects especially regards lower extremity strength and aerobic capacity. VITTORIO test is inexpensive, simple and easy to perform by the patient. Through the identification and the measurement of different aspects of physical disability, it allows a personalized rehabilitation exercise program. It could be used as an outcome measure of CR programs.

Aged↗

Is physical training contraindicated in patients with deep vein thrombosis during cardiac rehabilitation?

Deep vein thrombosis is a potential complication in patients admitted to cardiac rehabilitation programs after acute coronary syndromes, episodes of acute congestive heart failure, and cardiac revascularization. A common clinical problem in these patients is to decide whether to start or continue physical training or not, given the risk of pulmonary embolism. Until definite evidence becomes available, careful patient selection and inpatient supervision may avoid the a priori withdrawal of such an important core component of cardiac rehabilitation programs.

Contraindications↗

[ISYDE-Psi first step of the implementation of guidelines for psychology activities in cardiac rehabilitation and prevention. Italian SurveY on CarDiac REhabilitation-Psychology].

The Italian SurveY on CarDiac REhabilitation-Psychology (ISYDE-Psi) was developed, in line with the indications of the Italian National Guidelines Program, as part of a project to implement and apply the guidelines for psychology interventions in cardiac rehabilitation and prevention published in 2003. The Task Force on Psychological Interventions in Cardiac Rehabilitation conducted this pilot survey of the existing situation of Psychology in order to prepare the ground for implementation of the guidelines through interactive training. As part of the evaluation of training requirements a questionnaire was elaborated to gather information on the models of organization of and activities carried out by psychologists working in the surveyed cardiac rehabilitation facilities. Data collection for ISYDE-Psi terminated at the end of March 2005, with replies from 68/107 (63.6%) structures. In the light of this response, the Task Force has developed a training project for psychologists working in cardiac rehabilitation, sponsored by the Italian Council of Psychologists, that will be implemented in different regions of the country with the aim of disseminating the guidelines and promoting their correct application despite the existing regional disparities in organization.

Health Care Surveys↗

Contrast-enhanced magnetic resonance imaging assessment of scar size in patients with chronic myocardial infarction.

BACKGROUND: In the assessment of myocardial infarction (MI) mass, contrast-enhanced magnetic resonance imaging (CE-MRI) is comparable to single-photon emission computed tomography (SPECT). The aim of the present study was to determine whether the MI area, as assessed at CE-MRI and SPECT, is comparable to mass evaluation. We also compared CE-MRI and SPECT estimates of the MI area with functional evaluations made at echocardiography and kinetic MRI (cine-MRI). METHODS: We used a 1.0 Tesla MRI scanner and an inversion-recovery turboFLASH sequence, a tomographic gamma-camera and second-harmonic ultrasound systems. Two blinded operators assessed the extent of scarring, expressed as a percentage of the whole left ventricle (LV), using a 16-segment model. We studied 55 consecutive patients with a clinically stable healed MI (50 Q wave, 5 non-Q wave). RESULTS: The scar mass was 19+/-23% of the LV at CE-MRI and 21+/-25% at SPECT; the scar area was 29+/-23% of the LV at CE-MRI, 41+/-28% at SPECT, 29+/-31% at cine-MRI, and 32+/-29% at echocardiography. The Bland-Altman bias between CE-MRI and SPECT mass estimations was -2% of the LV with a+/-23% limit of agreement (LOA), while the bias between the area assessments was -12% with a+/-42% LOA. Bias between CE-MRI and functional evaluation by cine-MRI and echocardiography was 0% with a+/-39% LOA and -3% with a+/-36% LOA respectively. Comparing SPECT with cine-MRI and echocardiography the bias was 12% with a+/-52% LOA and 9% with a+/-56% LOA respectively. CONCLUSIONS: CE-MRI has proved to be comparable to SPECT in the assessment of the healed MI mass. Conversely, a high systematic error (high bias and LOA) renders CE-MRI and SPECT assessments of the MI area incomparable. Similarly (high bias and/or LOA) CE-MRI and SPECT estimations of the MI area cannot be compared with functional evaluation by echocardiography or cine-MRI.

Aged↗

Deep vein thrombosis among patients entering cardiac rehabilitation after coronary artery bypass surgery.

BACKGROUND: Little information is available about the prevalence of deep vein thrombosis (DVT) after discharge from cardiac surgery units and its impact on rehabilitation programs. OBJECTIVES: To estimate the rate of DVT, in relation to different thromboprophylaxis strategies, in patients with a recent coronary artery bypass graft (CABG) entering cardiac rehabilitation. METHODS: Two hundred seventy consecutive patients admitted to three rehabilitation facilities after CABG surgery from 19 cardiac surgery units (male patients, 81%; mean +/- SD age, 64 +/- 9 years; interval after operation, 4 to 19 days) underwent serial leg venous ultrasound examination on admission to three rehabilitative units. RESULTS: At admission, antiplatelet treatment was present in all patients except 10 with absolute contraindications. In 171 patients (63%), heparin prophylaxis (low-molecular-weight heparin once daily, 87%; unfractionated heparin twice daily, 13%) was reported, limited to the early postoperative period (< or = 3 days) in 102 patients (38%). DVT was detected in 47 patients (17.4%). The rate of proximal and isolated distal DVT was 2.6% (7 cases) and 14.8% (40 cases), respectively. DVT was complicated in two cases (0.7%) by symptomatic pulmonary embolism, fatal in one case (0.4%). Clots were found in the leg contralateral to the saphenous vein harvest site in half of all DVT cases. Forty-three DVT cases (91%) were diagnosed at admission, while serial ultrasound testing allowed diagnosis of an additional 4 distal DVT cases. At multivariate analysis, female sex (p < 0.001) and length of stay in the surgery unit > 8 days (p < 0.05) were independently associated with risk of DVT in the rehabilitation setting. The adoption of heparin prophylaxis until discharge predicted the absence of DVT after adjustment for immobility (p < 0.05). CONCLUSIONS: This study showed a high rate of DVT in patients entering cardiac rehabilitation after CABG surgery. Wearing unilateral graded compression stockings after CABG surgery had limited efficacy, as clots were often localized in legs contralateral to the saphenous vein harvest site.

Coronary Artery Bypass↗

Distance walked in the 6-minute test soon after cardiac surgery: toward an efficient use in the individual patient.

STUDY OBJECTIVES: To describe the results of the 6-min walking test performed on admission to an intensive rehabilitation program after cardiac surgery and to develop, through an algorithm based on a few clinical indicators, reference tables in order to apply distance walked values more efficiently in the individual patient at his/her entry into a cardiac rehabilitation program. SETTING: Intensive cardiac rehabilitation units. PATIENTS AND INTERVENTION: A total of 2,555 consecutive patients admitted between January 2001 and December 2002 to the Cardiac Rehabilitation Department of the S. Maugeri Foundation early after cardiac surgery performed a 6-min walking test within the fourth day of hospital admission. RESULTS: The mean walked distance was 296 +/- 111 m (+/- SD). At multiple regression analysis, age, sex, and comorbidity were independent predictors of walking test performance. The left ventricular ejection fraction only influenced the walked distance in men. Starting from these variables, we propose an algorithm and specific reference tables. CONCLUSIONS: Reference values for gender-, age-, comorbidity-, and systolic function-related test performance in patients after cardiac surgery at the beginning of the rehabilitative phase are provided. Once a new patient has been categorized through simple parameters, the actual distance walked could be compared with the matched reference value, thus making the interpretation of the result more efficient. The walked distance might be used to define different levels of disability and to personalize therapeutic exercise prescriptions.

Aged↗

Non-invasive coronary angiography with multislice computed tomography. Technology, methods, preliminary experience and prospects.

The recent technical developments in multislice computed tomography (MSCT), with ECG retro-gated image reconstruction, have elicited great interest in the possibility of accurate non-invasive imaging of the coronary arteries. The latest generation of MSCT systems with 8-16 rows of detectors permits acquisition of the whole cardiac volume during a single 15-20 s breath-hold with a submillimetric definition of the images and an outstanding signal-to-noise ratio. Thus the race which, between MSCT, electron beam computed tomography and cardiac magnetic resonance imaging, can best provide routine and reliable imaging of the coronary arteries in clinical practice has recommenced. Currently available MSCT systems offer different options for both cardiac image acquisition and reconstruction, including multiplanar and curved multiplanar reconstruction, three-dimensional volume rendering, maximum intensity projection, and virtual angioscopy. In our preliminary experience including 176 patients suffering from known or suspected coronary artery disease, MSCT was feasible in 161 (91.5%) and showed a sensitivity of 80.4% and a specificity of 80.3%, with respect to standard coronary angiography, in detecting critical stenosis in coronary arteries and artery or venous bypass grafts. These results correspond to a positive predictive value of 58.6% and a negative predictive value of 92.2%. The true role that MSCT is likely to play in the future in non-invasive coronary imaging is still to be defined. Nevertheless, the huge amount of data obtainable by MSCT along with the rapid technological advances, shorter acquisition times and reconstruction algorithm developments will make the technique stronger, and possible applications are expected not only for non-invasive coronary angiography, but also for cardiac function and myocardial perfusion evaluation, as an all-in-one examination.

Artificial Intelligence↗

Upper extremity deep vein thrombosis and pulmonary embolism after coronary bypass surgery: a case report and preliminary results from a prospective study evaluating patients during cardiac rehabilitation.

A 78-year-old woman with unstable angina underwent coronary bypass surgery with complete cardiac revascularization and no immediate postoperative complications. Six days after surgery, during hospitalization for cardiac rehabilitation, the patient developed severe respiratory distress and pulmonary embolism was diagnosed. Color duplex ultrasound revealed the presence of concomitant upper extremity deep vein thrombosis (UEDVT), ipsilateral to the site of placement of a central venous line, in the absence of lower extremity deep vein thrombosis. We describe this case and provide preliminary data from a prospective observational study evaluating the prevalence of catheter-related UEDVT and symptomatic pulmonary embolism (55 and 1.4% respectively) in a series of 71 consecutive coronary bypass surgery patients admitted to a cardiac rehabilitation facility. Catheter-related UEDVT and pulmonary embolism may complicate coronary bypass surgery and should be taken into consideration when managing patients after surgery.

Aged↗

Newly diagnosed carotid atherosclerosis in patients with coronary artery disease admitted for cardiac rehabilitation.

BACKGROUND: The association of coronary artery disease (CAD) with carotid artery disease has been well documented. However, data focusing on CAD patients participating in cardiac rehabilitation programs are lacking. We studied the prevalence of newly diagnosed carotid artery disease in CAD patients admitted for cardiac rehabilitation. METHODS: We performed carotid ultrasonography in 168 angiographically confirmed CAD patients admitted to two facilities. Patients with previous cerebrovascular episodes or carotid imaging were excluded. RESULTS: Out of 168 patients considered (mean age 65 +/- 8 years; males 76%; chronic stable angina as the reason for cardiac rehabilitation 34%, silent ischemia 14%, and acute coronary syndrome 52%), 149 (89%) were found to have carotid atherosclerosis. Carotid atherosclerosis was present in 83, 87, 89, and 93% of patients with one-, two- and three-vessel disease and left main stem CAD respectively. Patients with severe CAD (i.e. three-vessel or left main stem) had a higher prevalence of > or = 50% carotid stenosis as compared to patients without severe CAD (26 vs 8%, p < 0.05). Severe CAD had a high negative (92%) and a low positive (26%) predictive value for the presence of > or = 50% carotid stenosis. CONCLUSIONS: Silent and previously undetected carotid atherosclerosis is frequent in CAD patients admitted for cardiac rehabilitation. The absence of severe CAD reflects the absence of > or = 50% carotid stenosis.

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A self administered tool for the evaluation of the efficacy of health educational interventions in cardiac patients.

BACKGROUND: Since most cardiac rehabilitation and formal secondary prevention programmes for atherosclerotic cardiovascular disease include multidisciplinary interventions aimed at risk factors reduction and healthy lifestyle promotion, the use of specific outcome measurement instruments for the assessment of patients' knowledge before and after educational programmes should be included in usual clinical practice. For this reason we developed a new self-administered questionnaire (MaugerI CaRdiac preventiOn Questionnaire: MICRO-Q) addressed to the evaluation of information regarding secondary prevention in patients with coronary heart disease. METHODS: The development of the questionnaire consisted of different phases aimed to define the content, the number of items and the choice of possible responses. The final version of questionnaire consists of 26 items, 18 true statements and 8 false ones, with responses true, false, or don't know. MICRO-Q provides three separate scores: correct (number of items answered correctly), misconceptions (number of items wrongly answered), uncertainty (number of items answered 'don't know'), and covers knowledge of risk factors and lifestyle, diet, pre-admission avoidable delay, and cardiac disease. MICRO-Q was administered to 250 coronary patients (206 males, 44 females), mean age 61 +/- 10 years, in different geographical areas of Italy. The questionnaire's reliability was evaluated and descriptive analyses were performed. RESULTS: Spearman's Rho coefficient correlation (test-retest) for correct responses was 0.72, and the alpha value of the reliability analysis 0.68. Frequency analysis of each item was performed in detail. For the total score, the mean value was 18.90 (3.25) for the correct scale, 2.97 (1.66) for the misconceptions scale and 3.97 (3.56) for the uncertainty scale. Subgroups analysis of total scores showed no difference for gender and age, but patients with higher education had significantly higher scores on the correct scale (p < or = 0.0001), while patients with a lower level of education showed a higher score for misconceptions (p < or = 0.01). CONCLUSIONS: MICRO-Q is a simple, self-administered, efficient outcome measurement tool for the assessment of the efficacy of educational interventions in cardiac rehabilitation and secondary cardiovascular prevention. Patients' level of education and some erroneous beliefs are important keys to be taken into account in planning tailored educational interventions. In patients with coronary artery disease the MICRO-Q could be an useful and reliable clinical and quality-of-care outcome indicator for cardiac rehabilitation professionals.

Aged↗

[The ISYDE project. A survey on Cardiac Rehabilitation in Italy].

In 2001-2002 the Italian Working Group on Cardiac Rehabilitation (CR) developed the ISYDE project, a survey on CR in Italy. In 2001, the CR units were 144 (57% in the North of the country), 58% in general hospitals, 23% in private hospitals, 8% in rehabilitative hospital, and only 2% in university clinics. Patients admitted to CR were 60,819 (vs 37.049 in 1996, +64%); 86% of CR units treated > 100 pts/year (vs 66% in 1996; +32%). Patients were admitted to CR units after cardiosurgery in 55% of cases, after myocardial infarction in 22%, and for chronic heart failure in 9.6%, without significant differences respect to 1996. A special survey investigated the work-up performed in patients with recent myocardial infarction. The admission ranges from 11th to 20th day, the mean duration of the CR programs ranges from 21 to 34 days. Most of italian CR units have a definite program for risk stratification and secondary prevention. In particular, the programs of exercise training, educational interventions concerning diet, lifestyle, and smoking cessation, and psychological intervention are well designed, developed, and evaluated before discharge in most cases. In conclusion, although in recent years the number of CR units are increasing, and the quality of care may be well-established by serial evaluations scheduled before discharge and during the long-term follow-up, a further development is mandatory to face the needs of cardiac patients in the post-acute and chronic phase of a cardiac disease.

Health Surveys↗

[Guidelines on psychological intervention in cardiac rehabilitation- methodological process].

The development and the role of cardiac rehabilitation in healthcare programs related to cardiovascular diseases has led to the growth of knowledge, experience and specific technical, scientific, organizational and cultural skills on the part of the different health professionals engaged with the cardiologist in the management of rehabilitation programs. The need to define the characteristics of the psychological intervention in cardiac rehabilitation programs on the basis of scientific evidence encouraged the Board of the Italian Group of Cardiac Rehabilitation and Prevention [Gruppo Italiano di Cardiologia Riabilitativa e Preventiva (GICR)] to set up a working group (WG), composed of psychologists chosen on the basis of their proven specific experience in clinical research, with the task of defining the state-of-the-art of the psychological intervention in cardiac rehabilitation on the basis of documented efficacy, as a first step to formulating Guidelines on Psychological Intervention in Cardiac Rehabilitation. The methodology adopted by the WG was in line with the recommendations of the National Guidelines Program of the Italian Ministry of Health; the WG chose, in addition, to exploit a detailed critical review of clinical psychology practice in order to provide systematic evidence for recommendations and clinical approaches at present supported only by expert opinion. The document, which represents the basis upon which the Guidelines on the psychological activity in cardiac rehabilitation will be drawn up, is subdivided into three parts: an introduction, the main body of the text, and some appendices. In the introduction, the theme and context of the Guidelines are defined, preceded by a series of notes and user instructions; also defined in this section are the intended audience. The main body of the document is structured on the basis of the steps that characterize the interactions between the patient suffering from heart disease and the psychologist, through a qualitative analysis of the intervention offered by the psychologist. The phases of this process have been schematized as follows: selection, entry, evaluation, intervention, follow-up. For each of these phases, the evidence is given in support of the evaluative and therapeutic tools at the psychologist's disposition in the context of cardiac rehabilitation. The appendices to the document contain syntheses of the scientific information, some tables, a glossary and a section providing more in-depth information on specific topics. The recommendations contained in the document elaborated by the WG were formulated on the basis of a systematic review of the evidence available in the Italian and international literature, codified according to the National Guidelines Program. Also included is a series of recommendations or working instructions based on the shared clinical experience of the members of the WG. The state of progress of the work of formulating the Guidelines, the objectives, the methodological premises and the deadlines set for the phases of development, diffusion and implementation were presented at the VI National Congress of the GICR which was held in Cosenza, 3-5 October 2002. The base-draft of the document was submitted to the Scientific Committee of Reviewers. In October 2002 the Executive Committee of the GICR announced to the National Guidelines Program of the Ministry of Health, in the persons of the Presidents of the Advanced Institute of Health and of the Regional Health Services Agency, the planning and the timetable for the formulation of the Guidelines. In the course of the first 4 months of 2003 the document produced will be discussed and reviewed jointly by the WG, the Cardiologic Scientific Board instituted by the GICR enlarged to include a delegate of the patient and volunteer no-profit worker associations. The following phases will include the publication by mid 2003 of a position-paper. The final draft of the Guidelines on Psychological Intervention in Cardiac Rehabilitation will be submitted to the Commission of the National Guidelines Program.

Cardiac Rehabilitation↗

[Distance covered in walking test after heart surgery in patients over 70 years of age: outcome indicator for the assessment of quality of care in intensive rehabilitation].

UNLABELLED: For quality-of-care assessment of rehabilitation programs after cardiac surgery, measures of functional recovery have been proposed as outcome indicators. Aim of this study was to evaluate the feasibility, the safety and the informative content of the 6-min walking test (6 WT) performed in elderly patients soon after admission in an intensive rehabilitation program after cardiac surgery. METHODS: Population consists of 115 consecutive over-70 patients admitted to an in-hospital rehabilitation program after cardiac surgery. Within 7 days of admission, in 107 patients (93%) clinical conditions allowed the execution of a 6 WT, on ECG telemetry monitoring. Resting and exertional heart rate, score of fatigue (Borg Scale 1 divided by 20), symptoms, ECG alterations and arrhythmias were recorded. Other considered variables were: comorbidity (Charlson index), length of stay and complications occurring during the whole surgical and rehabilitation in-hospitalisation stay, disability (nursing needs: Maslow and nursing chart), functional status at discharge, left ventricular ejection fraction, number of exercise treatment sessions, self-perceived health-status at admission and at discharge (EuroQoL questionnaire). RESULTS: The mean walked distance was 194 +/- 93 m. No complication neither ECG alteration occurred during the 6 WT; only isolated premature ventricular beats were recorded in 26 pts. Heart rate increased from 86 +/- 13 at rest to 95 +/- 17 bpm at the end of the 6 WT (p < .0001). The perceived fatigue score was 12.9 +/- 1.2 Borg. Complications, length of stay, nursing needs, self-perceived health-status and functional capacity at discharge differed between patients who performed the 6 WT within 4 days compared with those who did it later, and between patients who walked < or = 120 m (lower quartile) compared with those who walked more. CONCLUSIONS: In elderly patients after cardiac surgery the 6 WT performed within the first week of admission in rehabilitation unit is feasible and safe. Simple cut-offs like timing of the 6 WT and walking performance identify more severe patients with lower susceptibility to recovery.

Age Factors↗

Slow breathing increases arterial baroreflex sensitivity in patients with chronic heart failure.

BACKGROUND: It is well established that a depressed baroreflex sensitivity may adversely influence the prognosis in patients with chronic heart failure (CHF) and in those with previous myocardial infarction. METHODS AND RESULTS: We tested whether a slow breathing rate (6 breaths/min) could modify the baroreflex sensitivity in 81 patients with stable (2 weeks) CHF (age, 58+/-1 years; NYHA classes I [6 patients], II [33], III [27], and IV [15]) and in 21 controls. Slow breathing induced highly significant increases in baroreflex sensitivity, both in controls (from 9.4+/-0.7 to 13.8+/-1.0 ms/mm Hg, P<0.0025) and in CHF patients (from 5.0+/-0.3 to 6.1+/-0.5 ms/mm Hg, P<0.0025), which correlated with the value obtained during spontaneous breathing (r=+0.202, P=0.047). In addition, systolic and diastolic blood pressure decreased in CHF patients (systolic, from 117+/-3 to 110+/-4 mm Hg, P=0.009; diastolic, from 62+/-1 to 59+/-1 mm Hg, P=0.02). CONCLUSIONS: These data suggest that in patients with CHF, slow breathing, in addition to improving oxygen saturation and exercise tolerance as has been previously shown, may be beneficial by increasing baroreflex sensitivity.

Arteries↗