scholarly journals Systolic and Diastolic Functions After a Brief Acute Bout of Mild Exercise in Normobaric Hypoxia

2021 ◽  
Vol 12 ◽  
Author(s):  
Sara Magnani ◽  
Gabriele Mulliri ◽  
Silvana Roberto ◽  
Fabio Sechi ◽  
Giovanna Ghiani ◽  
...  
Keyword(s):  
Stroke Volume ◽  
Acute Hypoxia ◽  
Exercise Bout ◽  
Tissue Doppler ◽  
Cycle Ergometer ◽  
Left Ventricular ◽  
Normobaric Hypoxia ◽  
Left Ventricular Volumes ◽  
Test Results ◽  
Diastolic Functions

Acute hypoxia (AH) is a challenge to the homeostasis of the cardiovascular system, especially during exercise. Research in this area is scarce. We aimed to ascertain whether echocardiographic, Doppler, and tissue Doppler measures were able to detect changes in systolic and diastolic functions during the recovery after mild exercise in AH. Twelve healthy males (age 33.5 ± 4.8 years) completed a cardiopulmonary test on an electromagnetically braked cycle-ergometer to determine their maximum workload (Wmax). On separate days, participants performed randomly assigned two exercise sessions consisting in 3 min pedalling at 30% of Wmax: (1) one test was conducted in normoxia (NORMO) and (2) one in normobaric hypoxia with FiO2 set to 13.5% (HYPO). Hemodynamics were assessed with an echocardiographic system. The main result was that the HYPO session increased parameters related to myocardial contractility such as pre-ejection period and systolic myocardial velocity with respect to the NORMO test. Moreover, the HYPO test enhanced early transmitral filling peak velocities. No effects were detected for left ventricular volumes, as end-diastolic, end-systolic, and stroke volume were similar between the NORMO and the HYPO test. Results of the present investigation support the hypothesis that a brief, mild exercise bout in acute normobaric hypoxia does not impair systolic or diastolic functions. Rather, it appears that stroke volume is well preserved and that systolic and early diastolic functions are enhanced by exercise in hypoxia.

scholarly journals Assessment of left ventricular systolic and diastolic functions in severely malnourished children

2019 ◽  
Vol 67 (1) ◽  
Author(s):  
Gihan M. Bebars ◽  
Hany T. Askalany
Keyword(s):  
Diastolic Dysfunction ◽  
Diastolic Function ◽  
Tissue Doppler ◽  
Left Ventricular ◽  
Doppler Imaging ◽  
Control Group ◽  
Nutritional Rehabilitation ◽  
Malnourished Children ◽  
Grade Ii ◽  
Diastolic Functions

Abstract Background Malnourished children endure many changes in body composition and lose heart and skeletal muscle mass. Diastolic dysfunction is one of the major causes of heart failure with preserved ejection fraction. Aim To assess left ventricular systolic and diastolic functions in children with severe acute malnutrition using tissue Doppler imaging technique and to evaluate the effect of nutritional rehabilitation. Patients and Methods A follow-up case-control study conducted on 60 severely malnourished children (WHZ < -3SD) and 120 age and sex-matched healthy children as a control group. Tissue Doppler imaging (TDI) was done for all included malnourished children at admission and for control to measure left ventricular systolic and diastolic functions. Nutritional rehabilitation was done according to WHO protocol and tissue doppler was repeated after rehabilitation when (WHZ > -2SD) to detect any changes in systolic or diastolic functions. Results Systolic function was normal in malnourished children and control. Grade I diastolic dysfunction was detected in 40% and grade II in 30% of severely malnourished children in comparison to 100% normal diastolic function in control group. No correlations between diastolic dysfunction and either anthropometric measurements, electrolyte disturbances or Hb% in malnourished children before nutritional rehabilitation. Mortality from sepsis with associated ventricular dysfunction grade II documented in 3.3% of malnourished children. After nutritional rehabilitation diastolic function improved significantly as 65.6% of children attained normal diastolic function, 31% grade1 and 3.4% grade II. Positive correlations between diastolic function and WAZ, HAZ, WHZ and MUAC after rehabilitation. Conclusion Severe acute malnutrition affects diastolic function in children which is reversible in most of these cases with rehabilitation. TDI is an easy and practical method for detection and follow-up of ventricular function in malnourished children.

Comparison of left ventricular volumes by dye dilution and angiographic methods in the dog

1963 ◽  
Vol 204 (3) ◽  
pp. 446-450 ◽  
Author(s):  
Franz J. Hallermann ◽  
G. C. Rastelli ◽  
H. J. C. Swan
Keyword(s):  
Stroke Volume ◽  
Left Ventricular ◽  
Dilution Method ◽  
Left Ventricular Volumes ◽  
Heart Rates ◽  
Systolic Volume ◽  
End Diastolic Volume ◽  
End Systolic Volume ◽  
Fundamental Error ◽  
Indicator Dye

In each of 12 mongrel dogs, data for end-diastolic volume, end-systolic volume, and stroke volume of the left ventricle were obtained by two independent methods: the indicator dilution method and a radiographic method. While the values for stroke volume showed good agreement between the two methods, a significant and directionally constant difference was found between values for end-diastolic volume and end-systolic volume calculated by the two different methods. This was observed in dogs with fast heart rates (exceeding 150 beats/min), as well as in dogs with heart rates of about 100 beats/min. The findings strongly suggest that a fundamental error is present in estimations of volume based on the washout of an indicator dye.

Evaluation of cardiac systolic and diastolic functions in small for gestational age babies during the first months of life: a prospective follow-up study

2013 ◽  
Vol 23 (4) ◽  
pp. 597-605 ◽  
Author(s):  
Dolunay Gürses ◽  
Burçin Seyhan
Keyword(s):  
Gestational Age ◽  
Small For Gestational Age ◽  
Doppler Echocardiography ◽  
Interventricular Septum ◽  
Tissue Doppler ◽  
Left Ventricular ◽  
Tissue Doppler Echocardiography ◽  
Cardiac Functions ◽  
Atrial Contraction ◽  
Diastolic Functions

AbstractObjectiveThe purpose of this study was to evaluate the cardiac functions and age-related changes of these functions in full-term small for gestational age infants during the first 3 months of life.MethodsCardiac functions of 20 term small for gestational age and 20 term appropriate for gestational age infants were studied using conventional and tissue Doppler echocardiography on postnatal day 5 and at 1 and 3 months.ResultsVentricular diameters, ventricular wall thicknesses, and left ventricular mass significantly increased with age in both groups. All these parameters were significantly lower in small for gestational age infants. No differences were detected by conventional echocardiography between the groups in systolic and diastolic functions. Systolic velocity, early diastolic and atrial contraction velocities, and the ratio between early diastolic and atrial contraction velocities determined by tissue Doppler echocardiography increased with age. Systolic velocity was lower in the small for gestational age babies for all myocardial regions on the 5th day. Peak early diastolic velocity was decreased in the small for gestational age babies at the first and second evaluations for all myocardial regions. The ratio between early diastolic and atrial contraction velocities was significantly lower in the small for gestational age babies for the interventricular septum and right ventricle. Significant positive correlations were detected between the Ponderal index and systolic and early diastolic velocities.ConclusionThe present findings suggest that systolic and diastolic function indices including tissue Doppler measures are significantly affected in small for gestational age babies during the first 3 months of life.

Acetazolamide alters temperature regulation during submaximal exercise

1990 ◽  
Vol 69 (4) ◽  
pp. 1402-1407 ◽  
Author(s):  
W. F. Brechue ◽  
J. M. Stager
Keyword(s):  
Stroke Volume ◽  
Minute Ventilation ◽  
Exercise Bout ◽  
Cycle Ergometer ◽  
Submaximal Exercise ◽  
Whole Body ◽  
Co2 Removal ◽  
O2 Uptake ◽  
Double Blind ◽  
Hypoxic Conditions

Acetazolamide (ACZ), a potent carbonic anhydrase inhibitor, is known to decrease submaximal exercise tolerance under normoxic and hypoxic conditions. These decrements in performance occur despite the maintenance of O2 consumption and CO2 removal. Because ACZ is a diuretic, it induces a moderate hypohydration that may have a role in reducing the ability to sustain exercise through cardiovascular and thermoregulatory impairment. To investigate this potential impairment, seven healthy males between 21 and 35 yr of age were studied in a double-blind crossover design (placebo vs. ACZ). ACZ was administered in three 250-mg oral doses 14, 8, and 2 h before exercise. Subjects exercised at 70% peak O2 uptake for 30 min on a cycle ergometer in a normoxic thermoneutral environment (25 degrees C, 40% relative humidity). Results indicate that exercise minute ventilation was greater but O2 uptake, CO2 output, and respiratory exchange ratio did not differ with ACZ. ACZ led to lower mean skin (0.7 degrees C), higher rectal (0.6 degrees C), and higher mean body temperatures (0.4 degrees C) after 30 min of exercise. Whole-body sweat loss was reduced 23%, and heat storage during the exercise bout was increased 55%. Stroke volume decreased 25%, and arteriovenous O2 difference increased 15%. A significant inverse relationship (r = -0.63) between heart rate and stroke volume was observed. It is concluded that previously reported decreases in the ability to sustain submaximal exercise with ACZ may be related to hypohydration-induced impairment of the cardiovascular and thermoregulatory systems.

Cardiovascular responses to treadmill and cycle ergometer exercise in children and adults

1997 ◽  
Vol 83 (3) ◽  
pp. 948-957 ◽  
Author(s):  
Kenneth R. Turley ◽  
Jack H. Wilmore
Keyword(s):  
Stroke Volume ◽  
Peripheral Resistance ◽  
Cardiovascular Responses ◽  
Cycle Ergometer ◽  
Left Ventricular ◽  
Absolute Amount ◽  
Exercise Tests ◽  
Exercise Modality ◽  
Cycle Ergometer Exercise ◽  
Ergometer Exercise

Turley, Kenneth R., and Jack H. Wilmore. Cardiovascular responses to treadmill and cycle ergometer exercise in children and adults. J. Appl. Physiol. 83(3): 948–957, 1997.—This study was conducted to determine whether submaximal cardiovascular responses at a given rate of work are different in children and adults, and, if different, what mechanisms are involved and whether the differences are exercise-modality dependent. A total of 24 children, 7 to 9 yr old, and 24 adults, 18 to 26 yr old (12 males and 12 females in each group), participated in both submaximal and maximal exercise tests on both the treadmill and cycle ergometer. With the use of regression analysis, it was determined that cardiac output (Q˙) was significantly lower ( P ≤ 0.05) at a given O2 consumption level (V˙o 2, l/min) in boys vs. men and in girls vs. women on both the treadmill and cycle ergometer. The lower Q˙ in the children was compensated for by a significantly higher ( P ≤ 0.05) arterial-mixed venous O2difference to achieve the same or similarV˙o 2. Furthermore, heart rate and total peripheral resistance were higher and stroke volume was lower in the children vs. in the adult groups on both exercise modalities. Stroke volume at a given rate of work was closely related to left ventricular mass, with correlation coefficients ranging from r = 0.89–0.92 and r = 0.88–0.93 in the males and females, respectively. It was concluded that submaximal cardiovascular responses are different in children and adults and that these differences are related to smaller hearts and a smaller absolute amount of muscle doing a given rate of work in the children. The differences were not exercise-modality dependent.

Dimensional analysis of right and left ventricles during positive-pressure ventilation in dogs

1982 ◽  
Vol 242 (4) ◽  
pp. H549-H556 ◽  
Author(s):  
S. S. Cassidy ◽  
J. H. Mitchell ◽  
R. L. Johnson
Keyword(s):  
Left Ventricle ◽  
Stroke Volume ◽  
Right Ventricular ◽  
Left Ventricular ◽  
Left Ventricular Volumes ◽  
Ventricular Volumes ◽  
End Diastolic Volume ◽  
Left And Right ◽  
The Right ◽  
Ventricular Dimensions

Our purpose was to determine the effects of controlled ventilation with positive end-expired pressure (PEEP) on ventricular dimensions and to relate changes in shape to changes in stroke volume and left ventricular volumes. Left and right ventricular dimensions were measured using biplane cinefluorography of dogs with radiopaque markers implanted in their hearts, and left ventricular volumes were derived from left ventricular dimensions by assuming that the left ventricle conformed to the shape of a nonprolate ellipsoid. As PEEP increased from 0 to 5, 10, and 15 cmH2O, stroke volume fell 36%, and all three left ventricular end-diastolic dimensions fell, with apex-base falling 5%, anterior-posterior falling 7%, and septal-lateral falling nearly twice as much, 12%. This resulted in a 11.3 cm3 fall in left ventricular end-diastolic volume. The right ventricular end-diastolic dimensions changed in opposite directions with respect to each other as the level and PEEP was raised to 15 cmH2O; one axis fell 3.2 mm, and the midpoint of the right ventricular free wall moved outward by 1.7 mm. Thus the fall in cardiac output (and stroke volume) during PEEP was associated with a fall in left ventricular end-diastolic volume and a change both left and right ventricular configurations. It is not known whether the left ventricular septal-lateral narrowing is the consequence of lateral wall compression by the lungs or encroachment on the left ventricle by the septum.

scholarly journals Echocardiographic evaluation of cardiac structure and function in obese Egyptian adolescents

2011 ◽  
Vol 22 (4) ◽  
pp. 410-416 ◽  
Author(s):  
Hanan M. Kamal ◽  
Hoda A. Atwa ◽  
Omar M. Saleh ◽  
Faten A. Mohamed
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Ventricular Hypertrophy ◽  
Tissue Doppler ◽  
Left Ventricular ◽  
Obese Group ◽  
Doppler Imaging ◽  
Hip Circumference ◽  
The Right ◽  
Diastolic Functions

AbstractObjectiveThe objective of this study was to detect structural and functional changes in the left and right ventricles in obese Egyptian adolescents.Methods and resultsAnthropometric and echocardiographic parameters, including tissue Doppler imaging, were obtained from 70 obese adolescents with average body mass index of 34 plus or minus 3.8 and compared with 50 age- and sex-matched controls, with a body mass index of 21.6 plus or minus 1.9. Cardiac dimensions, stroke volume, left ventricular and right ventricular systolic and diastolic functions were evaluated. The obese group had a higher end-diastolic septal and posterior wall thickness and left ventricular mass index than the non-obese group. Body mass index, mid-arm and hip circumference values showed significant correlations with these echocardiographic variables. Systolic and diastolic functions of the left ventricle were normal in both groups, although stroke volume was high in the obese group. The right ventricle tissue Doppler parameters were similar in both groups. However, the S wave of the septal/lateral tricuspid valve annulus was reduced in the obese group, but not to the level reflecting systolic dysfunction. This was inversely correlated with hip, waist, and mid-arm circumference. Stepwise multiple regression analysis showed that the mid-arm and hip circumference followed by the body mass index are significant predictors of these early cardiac abnormalities.ConclusionLeft ventricular hypertrophy is present in obese children, although both systolic and diastolic functions are normal. Tissue Doppler imaging revealed a minor, but still significant, reduction in the right ventricular systolic function. Mid-arm and hip circumference are predictors of left ventricular hypertrophy.

scholarly journals Left ventricular depression and pulmonary edema in rats after short-term normobaric hypoxia: effects of adrenergic blockade and reduced fluid load

2021 ◽  
Author(s):  
Peter Appelt ◽  
Philipp Gabriel ◽  
Christian Bölter ◽  
Nicole Fiedler ◽  
Katrin Schierle ◽  
...  
Keyword(s):  
Acute Hypoxia ◽  
Fluid Management ◽  
High Plasma ◽  
Left Ventricular ◽  
Normobaric Hypoxia ◽  
Plasma Catecholamine ◽  
Adrenergic Blockade ◽  
Pulmonary Injury ◽  
Hypoxic Conditions ◽  
Fluid Load

AbstractAcute normobaric hypoxia may induce pulmonary injury with edema (PE) and inflammation. Hypoxia is accompanied by sympathetic activation. As both acute hypoxia and high plasma catecholamine levels may elicit PE, we had originally expected that adrenergic blockade may attenuate the severity of hypoxic pulmonary injury. In particular, we investigated whether administration of drugs with reduced fluid load would be beneficial with respect to both cardiocirculatory and pulmonary functions in acute hypoxia. Rats were exposed to normobaric hypoxia (10% O2) over 1.5 or 6 h and received 0.9% NaCl or adrenergic blockers either as infusion (1 ml/h, increased fluid load) or injection (0.5 ml, reduced fluid load). Control animals were kept in normoxia and received infusions or injections of 0.9% NaCl. After 6 h of hypoxia, LV inotropic function was maintained with NaCl injection but decreased significantly with NaCl infusion. Adrenergic blockade induced a similar LV depression when fluid load was low, but did not further deteriorate LV depression after 6 h of infusion. Reduced fluid load also attenuated pulmonary injury after 6 h of hypoxia. This might be due to an effective fluid drainage into the pleural space. Adrenergic blockade could not prevent PE. In general, increased fluid load and impaired LV inotropic function promote the development of PE in acute hypoxia. The main physiologic conclusion from this study is that fluid reduction under hypoxic conditions has a protective effect on cardiopulmonary function. Consequently, appropriate fluid management has particular importance to subjects in hypoxic conditions.

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