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Regional Myocardial Blood Flow

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Regional Myocardial Blood Flow Regional Myocardial Blood Flow Jay M. Sullivan, … , William C. Elliott, Richard Gorlin J Clin Invest. 1967;46(9):1402-1412. https://doi.org/10.1172/JCI105632. Research Article A method is described which measures the local effectiveness of the myocardial circulation, expressed as a clearance constant. Uniform clearance constants have been demonstrated in the normal canine and human myocardium. A distinct difference in clearance constants has been demonstrated between the normal canine myocardium and areas of naturally occurring disease. Heterogeneous clearance constants have been found in a majority of human subjects with coronary artery disease—the lowest rates being noted in areas of fibrous aneurysm. Find the latest version: https://jci.me/105632/pdf The Journal of Clinical Investigation Vol. 46, No. 9, 1967 Regional Myocardial Blood Flow * JAY M. SULLIVAN,4 WARREN J. TAYLOR,§ WILLIAM C. ELLIOTT,II AND RICHARD GORLIN 1 (From the Cardiovascular Unit and Department of Medicine, Peter Bent Brigham Hospital and Harvard Medical School, Boston, Massachusetts) Summary. A method is described which measures the local effectiveness of the myocardial circulation, expressed as a clearance constant. Uniform clearance constants have been demonstrated in the normal canine and human myocardium. A distinct difference in clearance constants has been demon- strated between the normal canine myocardium and areas of naturally occurring disease. Heterogeneous clearance constants have been found in a majority of human subjects with coronary artery disease-the lowest rates being noted in areas of fibrous aneurysm. Introduction dog and later reported a decreased disappearance rate in subjects with coronary artery disease (5). In 1948 Kety suggested that the clearance rate Subsequently, the direct deposition of radiosodium of local deposits of radioactive material could be has been used to assess regional myocardial circu- used as an index of effective regional blood flow lation in dogs by Connoly and coworkers (6) in (2). Using 0.5-1.0 ml of isotonic 24Na solution, 1960 and Salisbury and associates (7) in 1962. he successfully determined the clearance constant In 1964, this technic was used by Kirk and Honig of skeletal muscle, and suggested that this method (8) to demonstrate a slower rate of clearance in the could also be used as a means of measuring myo- subendocardial layers of the myocardium when cardial blood flow. In 1952, this method was used compared with subepicardial layers. by Cullen and Reese (3) to measure myocardial The studies mentioned above have measured the circulation in dogs. In 1960, Hollander et al. (4) myocardial clearance of radiosodium and radioio- reported the use of direct injection of Na 1311 to dine. Renkin (9), studying the transport of elec- measure myocardial blood flow in man and in the trolytes from blood to tissue, pointed out that the * Submitted for publication 20 October 1966; accepted extraction ratio of hydrophilic ions fell to 0.5 at 1 June 1967. flow rates of 10 ml/100 g per min. Lassen (10) Reported in part at annual meeting, American Heart compared clearances in skeletal muscle and found Association, Bal Harbour, Fla., October 1965 (1). that 24Na and 133Xe measured virtually the same This work was supported by U. S. Public Health flow rate at rest (2.3 and 2.5 ml/100 g per min). Service grants HE 08591 and 1 TI 5679, and by a general research grant from the Ayerst Laboratories and Peter A much higher flow rate was measured by '33Xe Bent Brigham Hospital. during reactive hyperemia (56 ml/100 g per min : Formerly, Postdoctoral Fellow, National Heart In- in normal subjects), while that measured by 24Na stitute. was 12.9 ml/100 g per min. This was attributed § Instructor in Surgery, Harvard Medical School and to increasing limitation to sodium exchange at the Associate in Surgery, Peter Bent Brigham Hospital. 11 Instructor in Medicine, Harvard Medical School and capillary level with increasing flow. As myo- Junior Associate in Medicine, Peter Bent Brigham Hos- cardial blood flow is relatively fast, it would ap- pital. pear advantageous to use an inert, lipophilic tracer ¶1 Assistant Professor of Medicine, Harvard Medical such as 133Xe or 85Kr to measure myocardial per- School; Physician, Peter Bent Brigham Hospital; and Investigator, Howard Hughes Medical Institute. fusion, as these gases are able to cross the entire Address requests for reprints to Dr. Richard Gorlin, capillary-cell interface and are not limited by dif- 721 Huntington Avenue, Boston, Mass., 02215. fusion through pores as are 24Na and 131I. 1402 REGIONAL MYOCARDIAL BLOOD FLOW 1403 The safety of injection of small volumes of kg) and 1: 16 saturated chloralose-urethane solution as fluid into the human myocardium has been estab- needed. After induction of anesthesia, the dogs were placed in the right lateral decubitus position, and a thora- lished by Hollander et al. (4), and the safety of cotomy was performed in the fourth left interspace. radiation exposure involved established by Lassen Blood pressure and heart rate were monitored through- (11). This communication reports on the use of out the study. intramyocardial injections of radiokrypton to as- In the first animal, a segment of the proximal left an- sess the degree of myocardial perfusion in normal terior descending artery was dissected free, and a thin polyethylene cannula placed in the arterial lumen. Pro- and diseased dog hearts and in human subjects pranolol (2 mg) was given intravenously to slow heart with angiographically localized coronary artery rate and suppress ventricular irritability. Six pairs of disease. measurements of myocardial 'Kr clearance constants were made with injection into the myocardium adjacent Methods to the left anterior descending artery along with in- jections directly into the artery. 'Kr was used as an indicator in all experiments. Sup- In a second animal a Goldblatt clamp was placed on plied as a gas, it was agitated into solution with iso- the proximal left anterior descending artery. An intra- tonic saline. 0.3 ml of this solution (containing 10 Ac) myocardial injection of 'Kr was made distal to the was injected via a No. 27 needle along a diagonal tract clamp, and the decay curve monitored continuously dur- to a depth of approximately 3 mm beneath the epicardium. ing intermittent occlusion of the vessel. The surface of the myocardium was then sponged to eliminate minor initial bleeding from the injection site, In a third experiment, in three animals with grossly and a shielded scintillation probe with a 1 inch Na I normal hearts 41 intramyocardial deposits were made at crystal was placed 5 cm above the injection site. A rate random sites, but at uniform depths along the anterior meter, counting 30,000 cpm (time constant 1 sec), and descending artery and over the anterior left ventricle, attached to a direct-writing recorder, provided a record and isotope decay curves were recorded. of the disappearance of isotope. After subtraction of In the sixth animal, the fortuitous discovery of an background radiation, the above data were plotted on area of fibrous scarring on the anterior left ventricle semilogarithmic paper, and the clearance constant of the (probably secondary to canine small vessel arteritis) exponential portion of the curves was calculated from enabled four random measurements to be made over the the equation area of scar and four over normal myocardium. 33 human subjects, ranging in age from 35 to 62 yr K_ log CI-log C2 _ 0.6931 0.4343 (T2 - T1) half-time in min' were studied at thoracotomy. All subjects underwent prior cardiac catheterization and selective cine coronary where C1 and C2 = counts per minute at T1 and T2, re- angiography by the Sones technic. The four subjects spectively. With this basic technic, six animal experi- with normal coronary arteries included one with mitral ments were performed. Mongrel dogs (10-20 kg in stenosis and two with aortic stenosis who were under- weight) were anesthetized with morphine sulfate (5 mg/ going surgical correction of their valvular lesions. The 3X 104 Dog 1 "5Kr - ILAD cpml.SP04I 90 lio 150 180 210 Time in Seconds FIG. 1. DOG 1: PRECORDIAL 'KR CLEARANCE CURVE AFTER INJECTION OF TRACER INTO CANINE LEFT ANTERIOR DE- SCENDING ARTERY. LAD, left anterior descending artery. 1404 SULLIVAN, TAYLOR, ELLIOTT, AND GORLIN 3X Dog 1 85Kr- IM cpm 1.5 X101 120 Time in Seconds FIG. 2. DOG 1: PRECORDIAL 'KR CLEARANCE CURVE AFTER DEPOSITION OF TRACER INTO CANINE MIYOCARDIUM AD- JACENT TO LEFT ANTERIOR DESCENDING ARTERY. IM, intramyocardial. TABLE I first normal subject was found to have minimal narrowing 85 Krypton clearance constants* of the distal anterior descending artery with angiography, Experiment 1, normal canine left ventricle. but was found to have palpably normal vessels and a grossly normal myocardium at surgery. Mean Intra-arterial Intramyocardial blood Pulse 29 patients with diseased coronary arteries were stud- injection injection pressure rate ied at the time of surgery for internal mammary ar- mm Hg tery implantation. The patients were selected because of 0.47 0.61 86 123 refractory angina pectoris and demonstration of a greater 0.37 0.43 82 130 than 50% stenosis of the left anterior descending ar- 0.40 0.55 70 132 0.44 0.35 58 134 tery. Halothane-oxygen, meperidine, and curare were 0.46 0.45 60 130 used for anesthesia in all patients. Arterial blood pres- 0.41 0.31 56 132 sure and electrocardiograms were monitored in all pa- ± 0.425 0.038 SD 0.450 + 0.115 68 131 tients. Blood pressure, heart rate, and rhythm did not change significantly during the period of * With in-dwelling left anterior descending arterial intramyocardial cannula after beta-adrenergic blockade. clearance constant determinations. 3 X 104 85 Kr- IA A1 cpm 1.5 X 104 LAD Time in Seconds FIG.
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