Influence of right atrial pressure pulse on instantaneous vena caval blood flow

Rk, Brawley; Oldham, H. Newland; Js, Vasko; Henney, R. Peter; Ag, Morrow

doi:10.1152/ajplegacy.1966.211.2.347

Cited by 48 publications

(19 citation statements)

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“…In the nine patients in whom the right coronary artery was the culprit vessel, a high-grade right coronary artery stenosis proximal to the RV branches was present. The degree of right coronary artery stenosis was estimated as 85% in one 20 (Figure 4), whereas patients with severely depressed RA A waves (M pattern) had a less prominent increase (Figure 2), as reflected in a lower ratio of RV end-diastolic pressure to mean RV diastolic pressure (W pattern 1.43 -+-0.4; M pattern, 1.11 ± 0. 1, p < 0.05).…”

Section: Results Of Cardiac Catheterizationmentioning

confidence: 99%

Determinants of hemodynamic compromise with severe right ventricular infarction.

et al. 1990

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Section: Results Of Cardiac Catheterizationmentioning

confidence: 99%

Determinants of hemodynamic compromise with severe right ventricular infarction.

et al. 1990

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“…The jugular venous flow velocity is known to peak twice; once immediately in systole and once during diastole [9]. The systolic forward flow is initiated by atrial relaxation (X descent) [14,15] but is mainly determined by the descent of the base (X9 descent) during ventricular systole, when tracing the ventricle [16 -18]. This decrease in atrial pressure produced by the ventricular contraction may be facilitated by the decrease in pericardial pressures overlying the atrial surface [19].…”

Section: Discussionmentioning

confidence: 99%

Usefulness of transcutaneous Doppler jugular venous echo to predict pulmonary hypertension in COPD patients

et al. 2001

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Usefulness of transcutaneous Doppler jugular venous echo to predict pulmonary hypertension in COPD patients. W. Matsuyama, R. Ohkubo, K. Michizono, M. Abe, Y. Nakamura, M. Kawabata, M. Osame. #ERS Journals Ltd 2001. ABSTRACT: Pulmonary hypertension is an important factor that determines the prognosis of chronic obstructive pulmonary disease (COPD) patients. Echocardiography is a noninvasive and useful bedside method for measurement of pulmonary artery pressure. However, this method is sometimes difficult because of the overinflated lungs in COPD patients. This study attempted to estimate pulmonary hypertension in COPD patients using transcutaneous Doppler jugular vein flow velocity recording.The mean pulmonary artery pressure (MPAP) of 64 COPD patients was examined using cardiac catheterization. The right jugular vein flow velocity was measured within 24 h using transcutaneous Doppler echo, after which the ratio of diastolic flow (Df) and systemic flow (Sf) velocity was calculated. Subsequently, the statistical correlation of MPAP and the Df/Sf ratio was examined. MPAP was also measured using standard cardiac echo methods and the results were compared.The Df/Sf velocity ratio showed significant correlation with MPAP in COPD patients (r~0.844, pv0.0001). The sensitivity was 71.4%, and the specificity 95.3% (cut-off ratio~1.0). Jugular venous Doppler echo could be performed in all patients while other cardiac echo methods could not be performed in all patients. The specificity of the methods used was higher than other cardiac echo methods.Transcutaneous jugular vein flow velocity measurement may be applicable to bedside prediction of pulmonary hypertension in chronic obstructive pulmonary disease patients. [6,7]. However, these methods have some disadvantages, namely: 1) right-sided cardiac catheterization is invasive; 2) echocardiography is sometimes difficult in COPD patients because of the overinflated lungs; 3) the specificity and sensitivity of electrocardiography is low [8]; and 4) myocardial scintigraphy is expensive. In 1989, RANGANATHAN and SIVACIYAN [9] reported the usefulness of transcutaneous Doppler jugular venous flow velocity recording to estimate pulmonary artery pressure in patients with cardiac disorders but this method was not investigated in COPD patients. This study measured mean pulmonary artery pressure (MPAP) in COPD patients using the previous methods and investigated the predicted value of transcutaneous Doppler jugular venous flow velocity recording. This method was found to be applicable for bedside prediction of pulmonary hypertension in COPD patients. Patients and methodsThis study investigated 64 COPD patients (60 males) who were admitted to the Third Dept of Internal Medicine (Kagoshima University School of Medicine) and the Dept of Cardiology (NakamuraOnsen Hospital). Fifty-nine patients were suffering from emphysema while others had chronic bronchitis. All patients gave their written consent to participate in this study. All patients with tachycardia, arrythmia, infectious disor...

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“…Backflow was observed only in the superior vena cava and occurred always during the least negative intrathoracic pressure phase o f the respiratory cycle. The data published recently by B r a w ley eta l. (27) indicate that acceleration o f forward caval flow is associated with a decrease and deceleration with an increase in right atrial pressure. In dogs, which exhibited distinct a and v waves in the atrial pressure pattern these investigators observed two caval flow pulses per cardiac cycle.…”

Section: D) Effects O F Respirationmentioning

confidence: 89%