An indirect method for continuous registration of cardiac output from hemodynamic parameters

1982 ◽  
Vol 394 (S1) ◽  
pp. R9-R9
Author(s):  
H. Korb ◽  
A. Hoeft ◽  
D. Baller ◽  
R. Schräder ◽  
H. G. Wolpers ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Indirect Method ◽  
Hemodynamic Parameters ◽  
Continuous Registration

The effect of Trendelenburg and modified trendelenburg positions on cardiac output, blood pressure, and oxygenation: a preliminary study

1994 ◽  
Vol 3 (5) ◽  
pp. 382-386 ◽  
Author(s):  
CL Ostrow ◽  
E Hupp ◽  
D Topjian
Keyword(s):  
Blood Pressure ◽  
Cardiac Output ◽  
Critically Ill ◽  
Systemic Vascular Resistance ◽  
Vascular Resistance ◽  
Critically Ill Patients ◽  
Hemodynamic Parameters ◽  
Trendelenburg Position ◽  
Dependent Variables ◽  
Preliminary Study

BACKGROUND: Although we have insufficient knowledge about the effects of Trendelenburg positions on various hemodynamic parameters, these positions are frequently used to influence cardiac output and blood pressure in critically ill patients. OBJECTIVES: To determine the effect of Trendelenburg and modified Trendelenburg positions on five dependent variables: cardiac output, cardiac index, mean arterial pressure, systemic vascular resistance, and oxygenation in critically ill patients. METHODS: In this preliminary study subjects were 23 cardiac surgery patients (mean age, 55; SD, 8.09) who had a pulmonary artery catheter for cardiac output determination and who were clinically stable, normovolemic and normotensive. Baseline measurements of the dependent variables were taken in the supine position. Patients were then placed in 10 degrees Trendelenburg or 30 degrees modified Trendelenburg position. The dependent variables were measured after 10 minutes in each position. A 2-period, 2-treatment crossover design with a preliminary baseline measurement was used. RESULTS: Five subjects were unable to tolerate Trendelenburg position because of nausea or pain in the sternal incision. In the 18 who were able to tolerate both position changes, no statistically significant changes were found in the five dependent variables. Changes in systemic vascular resistance over time approached statistical significance and warrant further study. CONCLUSIONS: This preliminary study does not provide support for Trendelenburg positions as a means to influence hemodynamic parameters such as cardiac output and blood pressure in normovolemic and normotensive patients.

Non-Invasive Monitoring of Hemodynamic Parameters during Hemodialysis

1995 ◽  
Vol 18 (9) ◽  
pp. 499-503 ◽  
Author(s):  
F. Pizzarelli ◽  
P. Dattolo ◽  
M. Piacenti ◽  
M.A. Morales ◽  
T. Cerrai ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Cardiac Output ◽  
Blood Volume ◽  
Impedance Cardiography ◽  
Hemodynamic Parameters ◽  
Non Invasive ◽  
Transthoracic Impedance ◽  
Cardiac Output Index ◽  
On Line ◽  
Two Parameters

We studied in 13 hemodialysis patients intradialytic variations of blood volume (BV) and cardiac output, by means of non-invasive methods. We found a weak correlation, r 0.2 or less, between BV variations and intradialysis blood pressure variations. The sensitivity of the former in describing the variations of the latter was only 32%. During the 30 min preceeding the hypotensive crisis the percent BV variations did not show any predictive trend. On the contrary, refilling increased as blood pressure dropped and a weak inverse relation (r -0.35) was found between these two parameters. Unstable patients had predialytic blood volume values significantly lower than stable ones and comparable to healthy subjects. On the contrary, the correlation between percent variations of cardiac output index and MAP was 0.68 with a sensitivity and specificity of 90% and 59%, respectively. Unfortunately these promising results were obtained only with an estimate of cardiac output obtained by echocardiography and not by transthoracic impedance cardiography, which is much more feasible than the former as on-line monitoring of cardiac output. On-line monitoring of hemodynamic parameters is an appealing but still unsolved task.

THE CARDIAC OUTPUT AND CAROTID AND TIBIAL BLOOD PRESSURE OF THE TURKEY

1963 ◽  
Vol 41 (11) ◽  
pp. 2337-2341 ◽  
Author(s):  
Elwood W. Speckmann ◽  
Robert K. Ringer
Keyword(s):  
Body Weight ◽  
Cardiac Output ◽  
Pulse Pressure ◽  
Mature Male ◽  
Systemic Resistance ◽  
Hemodynamic Parameters ◽  
Radioactive Phosphorus ◽  
Arterial Blood ◽  
Tibial Arteries ◽  
The Mean

The cardiac output of untreated mature male Broad Breasted Bronze (BBB) turkeys was determined by an isotope dilution technique using radioactive phosphorus (P32). A Geiger–Mueller tube was connected to a rate meter which in turn was connected to a moving graph to continuously record the indicator concentration, thus obtaining the initial dilution curve. Posterior tibial and common carotid arterial blood pressures were measured directly and were recorded simultaneously with the cardiac output determinations by means of two strain gauges connected to a recording polygraph.From the cardiovascular measurements systemic resistance was calculated. The mean cardiac output of the mature male BBB turkey was 231 ml per kg body weight0.734 per minute. The mean carotid hemodynamic parameters were: systolic BP, 302 mm Hg; diastolic BP, 204 mm Hg; and pulse pressure, 98 mm Hg. Heart rate was 149 beats per minute. The mean tibial hemodynamic parameters were; systolic BP, 286 mm Hg; diastolic BP, 200 mm Hg; and pulse pressure, 85 mm Hg. The mean systemic resistance units were 0.17 and 0.16 for carotid and tibial arteries respectively on a bird basis and 1.13 and 1.08 respectively per kg body weight0.734.

THE CARDIAC OUTPUT AND CAROTID AND TIBIAL BLOOD PRESSURE OF THE TURKEY

1963 ◽  
Vol 41 (1) ◽  
pp. 2337-2341 ◽  
Author(s):  
Elwood W. Speckmann ◽  
Robert K. Ringer
Keyword(s):  
Body Weight ◽  
Cardiac Output ◽  
Pulse Pressure ◽  
Mature Male ◽  
Systemic Resistance ◽  
Hemodynamic Parameters ◽  
Radioactive Phosphorus ◽  
Arterial Blood ◽  
Tibial Arteries ◽  
The Mean

The cardiac output of untreated mature male Broad Breasted Bronze (BBB) turkeys was determined by an isotope dilution technique using radioactive phosphorus (P32). A Geiger–Mueller tube was connected to a rate meter which in turn was connected to a moving graph to continuously record the indicator concentration, thus obtaining the initial dilution curve. Posterior tibial and common carotid arterial blood pressures were measured directly and were recorded simultaneously with the cardiac output determinations by means of two strain gauges connected to a recording polygraph.From the cardiovascular measurements systemic resistance was calculated. The mean cardiac output of the mature male BBB turkey was 231 ml per kg body weight0.734 per minute. The mean carotid hemodynamic parameters were: systolic BP, 302 mm Hg; diastolic BP, 204 mm Hg; and pulse pressure, 98 mm Hg. Heart rate was 149 beats per minute. The mean tibial hemodynamic parameters were; systolic BP, 286 mm Hg; diastolic BP, 200 mm Hg; and pulse pressure, 85 mm Hg. The mean systemic resistance units were 0.17 and 0.16 for carotid and tibial arteries respectively on a bird basis and 1.13 and 1.08 respectively per kg body weight0.734.

The Action of Droperidol and Fentanyl on Cardiac Output and Related Hemodynamic Parameters*

1974 ◽  
Vol 67 (1) ◽  
pp. 49-53 ◽  
Author(s):  
H. A. FERRARI ◽  
R. J. GORTEN ◽  
I. H. TALTON ◽  
R. CANENT ◽  
J. K. GOODRICH
Keyword(s):  
Cardiac Output ◽  
Hemodynamic Parameters

scholarly journals 408 The relationship between right ventricle-arterial coupling and cardiac metabolism in pulmonary arterial hypertension - multimodal study

2020 ◽  
Vol 21 (Supplement_1) ◽  
Author(s):  
R Kazimierczyk ◽  
P Szumowski ◽  
P Blaszczak ◽  
E Kazimierczyk ◽  
K Ptaszynska-Kopczynska ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Control Group ◽  
Hemodynamic Parameters ◽  
Metabolic Demand ◽  
Pulmonary Arterial ◽  
The Relationship ◽  
Rv Function ◽  
Worse Prognosis

Abstract Background Right ventricular (RV) function is a major determinant of survival in patients with pulmonary arterial hypertension (PAH). The concept of coupling mainly refers to the relationship between ventricular contractility and afterload. In advanced PAH, to maintain cardiac output, RV dilates and the uncoupling occurs with wall stress and increased metabolic demand. We previously confirmed that impaired RV function is associated with increased glucose uptake of RV myocytes estimated by PET, which marks patients with worse prognosis. Purpose Whether echocardiographic approach of coupling parameters in PAH patients has relationship with RV metabolic alterations. Methods Twenty-six stable PAH patients (mean age 49.92 ± 15.94 years) and sixteen healthy subjects (control group) were enrolled into the study. The TAPSE, reflecting RV contractility, was obtained by mono-dimensional echo in standard technique. The echo estimation of the sPAP was reflecting RV afterload. Ventricular-arterial coupling was evaluated by the ratio between those two parameters. All PAH patients had also right heart catheterization (RHC) and PET performed during baseline visit. Heart glucose metabolism was assessed with fluorodeoxyglucose (FDG) as a tracer in PET. Its uptake was quantified as mean standardized uptake value (SUV) for both left ventricle (LV) and RV. Mean follow-up time of this study was 16.6 ± 7.5 months and the clinical end-point (CEP) was defined as death or clinical deterioration. Results Most of enrolled patients were in the WHO functional Class III (61%, 16). There were significant correlations between echo-derived hemodynamic parameters and RHC-derived values e.g. emPAP vs mPAP (RHC), r = 0.86, p < 0.001. Echo-estimated RV ventricular-arterial coupling parameter (TAPSE/sPAP) was 0.35 ± 0.20 in PAH group and 1.51 ± 0.22 in control group, p < 0.001. Mean SUV RV/LV ratio was 1.03 ± 0.68 in PAH group and 0.19 ± 0.08 in controls, p < 0.005. Echo-derived TAPSE/sPAP significantly correlated with hemodynamic parameters from RHC – cardiac output and pulmonary vascular resistance. Interestingly, we also observed significant correlations of TAPSE/sPAP with glucose uptake in PET - SUV RV as well as with SUV RV/LV (r=-0.63, p = 0.0006; r=-0.50, p = 0.0009), confirming higher metabolic demand in uncoupled heart in case of PAH. Furthermore, patients who reached CEP (n = 15, 57%) had a significantly lower TAPSE/esPAP ratio (0.29 ± 0.17 vs 0.43 ± 0.21, p = 0.04) and higher SUV RV/LV (1.39 ± 0.79 vs 0.55 ± 0.45, p = 0.01). ROC analysis revealed significant cut-off value of TAPSE/esPAP in predicting CEP (AUC 0.72 (95% CI 0.52-0.92), p = 0.03). Patients with TAPSE/esPAP lower than 0.25 mm/mmHg had worse prognosis, log-rank test, p = 0.001 (Figure 1). Conclusions Simple echocardiographic parameter reflecting RV coupling (TAPSE/esPAP) related to altered myocardium metabolism in PAH may predict outcome in patients with PAH. Abstract 408 Figure 1

Action of Pentolinium on Cardiac Output and Other Hemodynamic Parameters in the Rat.

1963 ◽  
Vol 113 (3) ◽  
pp. 652-656 ◽  
Author(s):  
R. V. Brink ◽  
R. Rosas ◽  
P. Blaquier ◽  
D. F. Bohr
Keyword(s):  
Cardiac Output ◽  
Hemodynamic Parameters
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