Measurement of cardiac output by electrical impedance at rest and during exercise

Denniston, Joseph C.; Maher, John; Reeves, J. T.; Cruz, Julio C.; Cymerman, Allen; Grover, R.

doi:10.1152/jappl.1976.40.1.91

Cited by 212 publications

(75 citation statements)

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“…Comparisons have been made with a wide range of invasive techniques, e.g. the direct Fick method [15,16], dye-dilution [17,18] and with the technique of CO 2 rebreathing [19,20]. Correlation coefficients between SV measurement using EIC and the reference method ranged 0.87-0.94.…”

Section: Methodsmentioning

confidence: 99%

The haemodynamic response to exercise in chronic obstructive pulmonary disease: assessment by impedance cardiography

Bogaard¹,

Dekker²,

Arntzen³

et al. 1998

Eur Respir J

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This study aimed to determine the differences in haemodynamic responses to a standard incremental exercise test between outpatients with chronic obstructive pulmonary disease (COPD) and age-matched controls and to discover the relationship between severity of airflow obstruction and exercise haemodynamics in COPD. Twenty-two male patients with COPD (forced expiratory volume in one second (FEV1)/vital capacity (VC))<80% predicted) and 20 age-matched male controls performed an incremental exercise test (10 W x min(-1)) with ventilatory function and changes in stroke volume (deltaSV) and cardiac output (deltaCO) measured by means of electrical impedance cardiography (EIC). Submaximal deltaSV and deltaCO were lower in COPD patients. Peak exercise deltaSV were equal in patients and controls (128+/-33 versus 129+/-29%, p=0.98), whereas peak deltaCO was lower in patients (COPD versus controls: 232+/-71 versus 289+/-54%, p<0.005). In COPD patients, FEV1 (% pred) was significantly correlated to deltaSV at all submaximal exercise intensities, to peak exercise deltaSV and to peak exercise deltaCO. FEV1/VC (% pred) was significantly correlated to deltaSV at 30 and 60 W. In conclusion, in chronic obstructive pulmonary disease an aberrant haemodynamic response to exercise was found, especially in patients with severe airflow obstruction. This aberrant response is related to the degree of airflow obstruction and may limit exercise performance in patients with severe chronic obstructive pulmonary disease.

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Section: Methodsmentioning

confidence: 99%

The haemodynamic response to exercise in chronic obstructive pulmonary disease: assessment by impedance cardiography

Bogaard¹,

Dekker²,

Arntzen³

et al. 1998

Eur Respir J

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“…Impedance cardiography which reliably detects small changes in stroke volume, (18,19,(22)(23)(24) revealed a significant 8% reduction in stroke volume during small physiologic elevations in plasma AVP. This response is most likely not related to an increased afterload since arterial blood pressure was minimally elevated.…”

Section: Methodsmentioning

confidence: 99%

Vasopressin reduces cardiac function and augments cardiopulmonary baroreflex resistance increases in man.

Ebert¹,

Cowley²,

Skelton³

1986

J. Clin. Invest.

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We examined the effects of physiologic infusions of arginine vasopressin (AVP) on cardiovascular hemodynamics and on reflex responses initiated by decreasing cardiopulmonary baroreceptor stimulation (with lower body negative pressure) in 10 healthy, captopril-pretreated young men (19-27 yr). Their responses were compared with those of four volunteers given isosmotic infusion. Heart rate, stroke volume, blood pressure, and forearm blood flow were measured by electrocardiography, impedance cardiography, radial artery cannulation, and strain gauge plethysmography. Two 55-min infusions of AVP at rates of 0.15 and 0.40 ng/kg per min increased average plasma concentrations from control levels of 5 pg/ml to 18 and 36 pg/ml, respectively. These infusions resulted in progressive reductions of heart rate and cardiac output and increases of forearm and total peripheral resistance. Blood pressure increases were significant only during the larger AVP infusion rate. Lower body negative pressure provoked reflex increases of total peripheral resistance. These increases were enhanced 60% during AVP infusion compared with increases during control (pre-AVP). Baseline measurements and reflex responses were unchanged by isosmotic infusions. These results demonstrate that AVP has profound effects on cardiovascular function and augments cardiopulmonary baroreflex-mediated increases of peripheral resistance in man.

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“…It has been shown that measurement of CO by impedance plethysmocardiography is valid even during exercise and is comparable to other standard methods. 17,18 However, because vigorous body movement considerably increased the noise of impedance, which would introduce error in the SV value, we used the SV value in the recovery phase soon after termination of the exercise. Therefore, the %SVend and %COend measured in the present study might not represent the maximum value of SV and CO during exercise.…”

Section: Discussionmentioning

confidence: 99%

Response of the Stroke Volume and Blood Pressure of Young Patients With Nonobstructive Hypertrophic Cardiomyopathy to Exercise

et al. 2001

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Stroke volume (SV), cardiac output (CO) and systolic blood pressure (SBP) were measured during maximal symptom-limited bicycle exercise testing in 13 young patients (age, 11-26 years) with nonobstructive hypertrophic cardiomyopathy (HCM). SV was measured by impedance plethysmocardiography; %SVend, %COend, and %SBPend represent the ratio of the value at termination of the exercise to the respective value at rest. In all patients of HCM-I (the Cardiac Event Group, 3 patients) and 3 of HCM-II (the Non-Cardiac Event Group, 10 patients), the %SVend was less than 100%. The %SVend of HCM-I was significantly lower than the respective values of the HCM-II and Control groups. The %COend values of the HCM-I and HCM-II groups were each significantly lower than that of the Control. The %SBPend values of the HCM-I and HCM-II groups were each significantly lower than that of the Control. Among the HCM patients, the %SVend value was positively correlated with the %SBPend value. The patients who had more severe HCM had poorer exercise-induced increases in SV and SBP. These results suggest that sudden cardiac death in young HCM patients is associated with inhibition of the increase in SV upon exercise. (Jpn Circ J 2001; 65: 300 -304)

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Measurement of cardiac output by electrical impedance at rest and during exercise

Cited by 212 publications

References 0 publications

The haemodynamic response to exercise in chronic obstructive pulmonary disease: assessment by impedance cardiography

The haemodynamic response to exercise in chronic obstructive pulmonary disease: assessment by impedance cardiography

Vasopressin reduces cardiac function and augments cardiopulmonary baroreflex resistance increases in man.

Response of the Stroke Volume and Blood Pressure of Young Patients With Nonobstructive Hypertrophic Cardiomyopathy to Exercise

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