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Left ventricular external constraint: relationship between pericardial, pleural and esophageal pressures during positive end-expiratory pressure and volume loading in dogs.

Annals of biomedical engineering

Kingma I, Smiseth OA, Frais MA, Smith ER, Tyberg JV.
PMID: 3310760
Ann Biomed Eng. 1987;15(3):331-46. doi: 10.1007/BF02584288.

Left ventricular (LV) diastolic filling is limited by the constraining effects exerted by the pericardium (PE) and the lung/chest wall. The aim of the present study was to assess the validity of various estimates of external cardiac constraint, compared...

Ventricular diastole and the role of the pericardium.


Tyberg JV, Smith ER.
PMID: 2279730
Herz. 1990 Dec;15(6):354-61.

In order to understand the mechanics of left ventricular (LV) diastolic filling it has become important to understand the role of the pericardium. This is because it has been demonstrated that the LV pressure-volume relationship can be shifted by...

Determination of frequency response from step response: application to fluid-filled catheters.

The American journal of physiology

Glantz SA, Tyberg JV.
PMID: 420321
Am J Physiol. 1979 Feb;236(2):H376-8. doi: 10.1152/ajpheart.1979.236.2.H376.

The performance of a fluid-filled catheter can be described by reporting its undamped natural frequency and damping ratio. These parameters can be measured by subjecting the catheter to sinusoidally varying pressures at a wide variety of frequencies to obtain...

Enhanced cardiac response to catecholamines in physically trained cats.

The American journal of physiology

Wyatt HL, Chuck L, Rabinowitz B, Tyberg JV, Parmley WW.
PMID: 645927
Am J Physiol. 1978 May;234(5):H608-13. doi: 10.1152/ajpheart.1978.234.5.H608.

No abstract available.

Venous modulation of ventricular preload.

American heart journal

Tyberg JV.
PMID: 1549988
Am Heart J. 1992 Apr;123(4):1098-104. doi: 10.1016/0002-8703(92)90736-f.

The objective of this discussion has been to describe a simple conceptual model of the circulation that emphasizes the role of the venous capacitance vasculature and is based on simplified vascular pressure-volume relationships. First, it is hoped that this...

Pericardial pressure attenuates release of atriopeptin in volume-expanded dogs.

The American journal of physiology

Stone JA, Wilkes PR, Keane PM, Smith ER, Tyberg JV.
PMID: 2522279
Am J Physiol. 1989 Mar;256(3):H648-54. doi: 10.1152/ajpheart.1989.256.3.H648.

The role of the pericardium in the release of atriopeptin (AP) was examined, utilizing two separate protocols, in alpha-chloralose-anesthetized dogs. Protocol I consisted of an experimental group (9 dogs), in which the pericardium was incised to allow instrumentation and...

Mechanics of myocardial ischemia.

Advances in cardiology

Tyberg JV, Parmley WW.
PMID: 636922
Adv Cardiol. 1978;23:40-51. doi: 10.1159/000401072.

No abstract available.

Reduction in ventricular endocardial and epicardial potentials during acute increments in left ventricular dimensions.

American heart journal

Lekven J, Chatterjee K, Tyberg JV, Parmley WW.
PMID: 453023
Am Heart J. 1979 Aug;98(2):200-6. doi: 10.1016/0002-8703(79)90222-9.

Unipolar potentials were recorded from the endocardium (Endo-Pot) and the epicardium (Epi-Pot) of the left and right ventricles of anesthetized open-chested dogs during acute changes in left ventricular dimension by blood transfusion. A pair of implanted ultrasonic crystals were...

Experimental instrumentation and left ventricular pressure-strain relationship.

The American journal of physiology

Scott-Douglas NW, Traboulsi M, Smith ER, Tyberg JV.
PMID: 1750527
Am J Physiol. 1991 Dec;261(6):H1693-7. doi: 10.1152/ajpheart.1991.261.6.H1693.

Pericardial pressure measurement with a balloon transducer requires opening and reapproximating the pericardium. If this instrumentation significantly compromises pericardial volume, the heart may be constrained, exaggerating the magnitude of pericardial pressure and thus altering the left ventricular end-diastolic pressure-volume...

The hemodynamics of coronary arterial stenosis.

Cardiovascular clinics

Tyberg JV, Massie BM, Botvinick EH, Parmley W.
PMID: 332373
Cardiovasc Clin. 1977;8(2):71-84.

No abstract available.

Left and right ventricular diastolic function during acute pericardial tamponade.

Clinical physiology (Oxford, England)

Smiseth OA, Frais MA, Junemann M, Kingma I, Refsum H, Smith ER, Lipton MJ, Tyberg JV.
PMID: 2019079
Clin Physiol. 1991 Jan;11(1):61-71. doi: 10.1111/j.1475-097x.1991.tb00654.x.

The aim of the study was to determine the effect of acute pericardial tamponade on left (LV) and right ventricular (RV) intracavitary and transmural pressure-volume (P-V) relations and to assess the effect of changing blood volume during tamponade on...

Hemodynamic effects of BASH. Body acceleration synchronous with the heartbeat.

Bibliotheca cardiologica

Tyberg JV, Parmley WW, Salzman SH, Swan HJ.
PMID: 5075220
Bibl Cardiol. 1972;29:6-13.

No abstract available.

Showing 1 to 12 of 198 entries