<i>Delay in Transmission of a Pressure Impulse Through a Cardiac Catheter and Vinyl Plastic Tubing</i>

Gordon, Alvin J.; Braunwald, Eugene; Moscovitz, Howard L.; Amram, Salomao S.

doi:10.1152/jappl.1956.8.5.573

Cited by 12 publications

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“…In contrast to the data in man 8 in whom a delayed onset of QRS complex to onset of ventricular pressure upstroke is not infrequent during ventricular premature extrasystoles, electrical-mechanical delay was rarely noted in the dog during similar circumstances (tables 2 and 3). In the 293 right ventricular extrasystoles, the onset of QRS to onset of right ventricular pressure upstroke As-as greater than 0.10 second in 4 instances; the QRS to left ventricular pressure upstroke interval was delayed in a like number of beats.…”

Section: Resultscontrasting

confidence: 58%

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Electrical Activation and Mechanical Asynchronism in the Cardiac Cycle of the Dog

Samet

Bernstein

Litwak

1959

Circulation Research

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With the technical a.s.ii.ituiice of Willium H. Meyer, Jr., M.U., uud Louix Lmnberg, M.IJ. Right mid left ventricular pressure curves and electrocardiogram were recorded in the dog during sinus rhythm and during mechanically induced right and left ventricular premature systoles. The normal range during sinus rhythm for the relationship between onset of right and left ventricular contraction was determined. At one extreme, right ventricular contraction commenced 0.02 second before the left; at the other extreme, left ventricular contraction started 0.03 second before the right. In most instances, the onsets of ventricular contraction were either temporally identical or one ventricle contracted 0.01 second prior to the other. DISSOCIATION of electrical and mechanical events in the cardiac cycle has been reported by several observers.1 ' 3 Previous studies 4 have suggested that electrical ventricular asynchronism (complete bundle branch block, ventricular premature beats, WolffParkiiison-White Syndrome, and complete heart block with idioventricular rhythm) does not necessarily lead to mechanical ventricular asynchronism in onset of ventricular contraction. However, divergent data have been presented. 5 The literature pertaining to this subject has recently been summarized.' Supported in part by a grant from the V.S. Public Health Service and the National Heart Institute (H-2735) and a grant from the Florida Heart Association.Presented in part at the eightieth annual meeting of the American Physiology Society, Philadelphia, April, 1958.Dr. Litwak is an Investigator, Howard Hughes Medical Institute.Dr. Meyer is a Trainee, Xational Heart Institute. Received for publication October 22, 1958. evidence only. In two studies in man direct recording of right and left ventricular pressure curves was performed. Brannwald and Morrow 7 performed simultaneous right and left heart catheterization in 15 patients with complete bundle branch block (5 with left bundle branch block, and 10 with right bundle branch block). Asynchronous contraction of the two ventricles was absent in all 5 patients with left bundle branch block and 6 with right bundle branch block. Samet et al. 6 have recorded right and left ventricular curves during 100 ventricular premature beats obtained in the course of simultaneous right and left heart catheterization. Mechanical asynchronism in onset of ventricular isometric contraction was found in only 28 of 100 ventricular premature systoles with widened aberrant QRS complexes.The present study was designed to extend to the dog these observations on the mechanics of ventricular contraction during ventricular premature complexes. The presence of catheters within the lumen of the right and left ventricle in the study of man could theoretically obscure mechanical asynchronism by endocardia] stimulation near the interventricular septum. METHODSSimultaneous right and left ventricular pressure curves were registered in 31 dogs under barbiturate anesthesia (pentobarbital sodium, 30 mg./Kg.,

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Section: Resultscontrasting

confidence: 58%

“…The difference in electrical-mechanical transmission time in the above recording system was determined by the method of Gordon et al 8 and noted to be 0.004 second. This interval was not considered significant since the electrical-mechanical time intervals are reported only to the nearest 0.01 second interval in the present study.…”

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confidence: 99%

Electrical Activation and Mechanical Asynchronism in the Cardiac Cycle of the Dog

Samet

Bernstein

Litwak

1959

Circulation Research

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“…The transmission time delay through this system was found to be 0.005 sec. 7 and this figure was deducted from the measured value in determining the relationship of electric to mechanical events. A four-channel oscillographic recorder utilizing a single electronic gun with a vertical sweep and a paper speed of 50 mm./sec.…”

Section: Methodsmentioning

confidence: 99%

Pressure Events of the Cardiac Cycle in the Dog

Moscovitz

Wilder

1956

Circulation Research

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Simultaneous pressure curves from the cardiac cavities, aorta and pulmonary artery of dogs were recorded by manometers of equal sensitivity. It was found that left ventricular pressure during ejection is practically identical with that of the aorta. In the majority of dogs atrial and ventricular end-diastolic pressures were equal. The temporal relations of events in the right and left heart were similar to those reported in man, but the duration of the cardiac cycle is too dependent on cycle length to permit comparison.T HE classic physiologic studies of Wiggers 1 have defined the dynamic details of the phases of the cardiac cycle in the dog. Wiggers, however, commented upon the technical difficulty experienced in attempting to record simultaneously the three pressure pulses of each side of the heart, i.e., left atrium, left ventricle and aorta or right atrium, right ventricle and pulmonary artery.3 Pressures recorded separately must be reduced to a standard scale of ordinates and artificially superimposed and retraced in order to reproduce graphically and quantitatively the simultaneous pressure relationships of the cardiac cycle. Because of the uncertain reliability of such reconstructed curves, differences of opinion still exist as to the magnitude of the difference between the ventricular and aortic pressures during ejection' and as to the agreement of ventricular and atrial end-diastolic pressures.

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Über die Zeitdauer, die eine Druckwelle braucht, um einen Herzkatheter zu durchlaufen

Kleyn¹,

Tap

1966

Soziosomatik Der Kreislaufkrankheiten

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Delay in Transmission of a Pressure Impulse Through a Cardiac Catheter and Vinyl Plastic Tubing

Cited by 12 publications

References 0 publications

Electrical Activation and Mechanical Asynchronism in the Cardiac Cycle of the Dog

Electrical Activation and Mechanical Asynchronism in the Cardiac Cycle of the Dog

Pressure Events of the Cardiac Cycle in the Dog

Über die Zeitdauer, die eine Druckwelle braucht, um einen Herzkatheter zu durchlaufen

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