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Biomedical subjects

T Nishikimi

Publications and source records attributed to T Nishikimi.

At least 73 records · Page 4Linked to original sources

Plasma levels of adrenomedullin in primary and secondary pulmonary hypertension in patients <20 years of age.

To elucidate the pathophysiologic significance of adrenomedullin in pulmonary hypertension, we measured plasma adrenomedullin-like immunoreactivity (AM-LI) concentrations in blood samples obtained from various sites during cardiac catheterization by using radioimmunoassay in patients with pulmonary hypertension in comparison with patients without pulmonary hypertension. In patients with pulmonary hypertension, plasma AM-LI concentrations were significantly elevated and there was a significant uptake of AM-LI in pulmonary circulation, indicating the involvement of adrenomedullin in the cardiovascular regulation of pulmonary circulation in pulmonary hypertension.

Adolescent↗

The role of vasopressin in essential hypertension. Plasma levels and effects of the V1 receptor antagonist OPC-21268 during different dietary sodium intakes.

To study the role of vasopressin (VP) in essential hypertension, we examined plasma levels of VP and blood pressure (BP) response to an orally active V1 receptor antagonist, OPC-21268, in hypertensive patients on diets with different sodium contents. Plasma VP was determined in 12 normotensive subjects and 12 patients with mild essential hypertension on a regular sodium diet, and in eight hypertensive patients on a high sodium (250 mmol/day) and a low sodium (25 mmol/day) diet. BP response was examined for 4 h after single oral administration of OPC-21268 (100 mg) or placebo in eight patients on the regular diet, and in six patients on the high and low sodium diets. In four patients on the regular diet, the effects of OPC-21268 on the baroreflex control of heart rate were also examined with intravenous injections of methoxamine. Plasma VP did not differ between the normotensive and hypertensive subjects. Levels of VP in the plasma was higher in the high sodium than in the low sodium period, but the difference was not significant. BP and heart rate did not change significantly after administration of OPC-21268 or placebo under either condition. OPC-21268 also failed to lower BP in salt-sensitive patients on the high sodium diet. The baroreceptor reflex sensitivity was not modified by the administration of OPC-21268. Our results suggest that VP does not play an important role in mild essential hypertension through its action on the V1 receptors regardless of dietary sodium intake.

Adult↗

Effect of exercise on plasma adrenomedullin and natriuretic peptide levels in myocardial infarction.

1. We investigated the effect of exercise on plasma adrenomedullin, atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) concentrations and studied the relationship between these peptides and haemodynamic parameters in nine patients with old myocardial infarction (MI) and in eight normal subjects. 2. The exercise protocol consisted of two fixed work loads (40 and 80 W) for 4 min each and venous blood samples were taken at rest, during each exercise stage and after exercise while monitoring the mean arterial pressure (MAP) and heart rate (HR). In MI, pulmonary arterial pressure (PAP), pulmonary capillary wedge pressure (PCWP), left ventricular end-diastolic pressure (LVEDP) and cardiac output (CO) were measured throughout exercise. 3. Adrenomedullin levels did not significantly increase with exercise. Adrenomedullin levels correlated with PAP and PCWP at rest (P < 0.05). Atrial natriuretic peptide levels correlated with PAP, PCWP and LVEDP throughout exercise (P < 0.05) but, on multiple regression analysis, PCWP correlated only with ANP (P < 0.01). Brain natriuretic peptide levels correlated with LVEDP throughout exercise (P < 0.01) and its increment correlated closely with basal BNP levels at rest (P < 0.01). 4. These results suggest that adrenomedullin does not respond to the acute haemodynamic changes of exercise, whereas ANP responds to it and PCWP is the major stimulus factor. Brain natriuretic peptide responds to exercise in proportion to the basal synthesis of BNP in patients with left ventricular dysfunction and LVEDP may play a role in increasing BNP during exercise.

Adrenomedullin↗

Plasma concentrations of adrenomedullin correlate with the extent of pulmonary hypertension in patients with mitral stenosis.

OBJECTIVE: To examine the pathophysiological significance of adrenomedullin in the pulmonary circulation by investigating the relation between plasma concentrations of adrenomedullin and central haemodynamics in patients with mitral stenosis. METHODS: Plasma concentrations of adrenomedullin in blood samples obtained from the femoral vein, pulmonary artery, left atrium, and aorta were measured by a newly developed specific radio-immunoassay in 23 consecutive patients with mitral stenosis (16 females and seven males, aged 53 (10) years (mean (SD)) who were undergoing percutaneous mitral commissurotomy. RESULTS: Patients with mitral stenosis had higher concentrations of adrenomedullin than age matched normal controls (3.9 (0.3) v 2.5 (0.3) pmol/l, p < 0.001). There was a reduction in adrenomedullin concentrations between the pulmonary artery and the left atrium (3.8 (0.2) v 3.2 (0.4) pmol/l, p < 0.001). The venous concentrations of adrenomedullin correlated with mean pulmonary artery pressure (r = 0.65, p < 0.001), total pulmonary vascular resistance (r = 0.83, p < 0.0001), and pulmonary vascular resistance (r = 0.65, p < 0.001). Plasma concentrations of adrenomedullin did not change immediately after percutaneous mitral commissurotomy; however, they decreased significantly one week later. CONCLUSIONS: Plasma concentrations of adrenomedullin are increased in patients with mitral stenosis. This may help to attenuate the increased pulmonary arterial resistance in secondary pulmonary hypertension due to mitral stenosis.

Adrenomedullin↗

Plasma adrenomedullin concentrations and cardiac and arterial hypertrophy in hypertension.

It has been reported that plasma concentrations of adrenomedullin (AM), a novel vasodilator peptide, are higher in patients with essential hypertension than those in normotensive subjects. To clarify the clinical significance of increased levels of AM in patients with essential hypertension, in this study we examined the relationship between plasma concentrations of AM and the structure of the left ventricle or carotid artery. Plasma AM concentrations; renin activity; and norepinephrine, epinephrine, and creatinine concentrations in 50 patients with untreated essential hypertension without renal dysfunction and heart failure were measured. We also measured the mean wall thickness of the left ventricle and left ventricular mass index by M-mode echocardiography and intimal-medial thickness and arterial distensibility of the carotid artery by ultrasonography. Hypertensive patients were divided into two groups: hypertensives with and those without left ventricular hypertrophy. Plasma AM concentrations in hypertensive patients with left ventricular hypertrophy were significantly higher than in hypertensive patients without left ventricular hypertrophy (7.87+/-2.70 vs 5.74+/-1.65 fmol/mL, P<.01). In all hypertensive patients, plasma AM concentrations were not correlated with blood pressure, plasma renin activity, plasma norepinephrine, plasma epinephrine, or plasma creatinine concentration. Plasma AM concentrations were positively correlated with left ventricular mass index or mean wall thickness (r=.37, P=.009; r=.40, P=.004, respectively) and inversely correlated with carotid artery distensibility (r=-.33, P=.02), whereas plasma AM concentrations were not correlated with intimal-medial thickness. These results suggest that the observed elevation of plasma AM in patients with essential hypertension with normal renal function may be partly related to cardiac hypertrophy and decreased carotid artery distensibility.

Adrenomedullin↗

Cardiac production and secretion of adrenomedullin are increased in heart failure.

Plasma adrenomedullin (AM) levels are reportedly increased in heart failure, but whether the cardiac production and secretion of AM is increased in heart failure remains unknown. To investigate the sites of production and secretion of AM in heart failure, we measured plasma AM levels and peptide and mRNA levels of AM in various tissues in rats with heart failure. We also examined whether the heart actually secretes AM into the circulation in patients with heart failure. We measured plasma and tissue AM levels by specific radioimmunoassay and AM mRNA by Northern blot analysis in rats with heart failure produced by aortocaval fistula. We also measured plasma AM levels in the coronary sinus and aorta in patients with left ventricular dysfunction before and after rapid right ventricular pacing. The increase in plasma AM levels in heart failure rats correlated with ventricular weight. Tissue AM levels were increased in the heart and lungs but not in the kidneys or adrenals of rats with heart failure. Similarly, tissue AM mRNA levels were also increased in the heart and lungs of heart failure rats. Plasma AM levels were higher in the coronary sinus than in the aorta in patients with left ventricular dysfunction. Rapid right ventricular pacing increased plasma atrial natriuretic peptide but not AM. These results suggest that plasma AM levels are increased in heart failure in proportion to the severity of heart failure and that cardiac production and secretion of AM is increased in heart failure rats. The lung may be another site for increased production of AM in heart failure rats. Human failing heart actually secretes AM into the circulation, and the regulation of AM secretion appears to differ from that of atrial natriuretic peptide.

Adrenal Glands↗

Left ventricular systolic and diastolic function and mass before and after antihypertensive treatment in patients with essential hypertension.

The effects of antihypertensive treatment on regression of left ventricular hypertrophy and on left ventricular systolic and diastolic function were investigated echocardiographically in 13 untreated patients with mild hypertension (group I) and 16 untreated patients with moderate to severe hypertension (group II). The left ventricular mass index, left ventricular wall thickness, end-systolic left ventricular wall stress, and diastolic filling indexes before treatment were significantly higher in group II than in group I (p < 0.01). The blood pressure of both groups decreased significantly after antihypertensive treatment (mean duration of follow-up, 1.8 +/- 0.3 yr in group I and 2.0 +/- 0.4 yr in group II) (p < 0.01). The left ventricular mass index did not change in group I, whereas it decreased significantly in group II (p < 0.01). The relation between fractional shortening and end-systolic wall stress was similar in both groups before treatment and was unaltered by treatment in either group. After treatment, peak velocity in early diastole (E) significantly increased in both groups; however, peak velocity in late diastole (A) did not decrease in either group. The A/E ratio was significantly decreased in both groups and was significantly higher in group II than in group I (p < 0.01). In conclusion, the results suggest that intrinsic contractility may not be affected by left ventricular hypertrophy or regression of left ventricular hypertrophy. A/E ratio decreased after antihypertensive treatment in patients with mild hypertension mainly because of a decrease in blood pressure.

Adult↗

Different secretion patterns of adrenomedullin, brain natriuretic peptide, and atrial natriuretic peptide during exercise in hypertensive and normotensive subjects.

The purpose of this study was to investigate the effect of exercise on plasma concentrations of adrenomedullin, brain natriuretic peptide (BNP), and atrial natriuretic peptide (ANP) in patients with essential hypertension (n = 15) and in normotensive controls (n = 10). Exercise consisted of two fixed workloads, 40 and 80 watts of work load using a supine bicycle ergometer. Plasma levels of all three peptides at rest were significantly higher in hypertensives than in controls. Plasma concentrations of ANP increased with exercise in both groups and had greater increments in hypertensive patients than in normotensives. Plasma concentrations of BNP increased only in patients with hypertension and the levels of increase correlated with basal plasma BNP levels (r = 0.94, p < 0.001) and with left ventricular mass (r = 0.62, p < 0.01) determined by echocardiography. In contrast, plasma adrenomedullin did not change with exercise in either group. These results suggest that secretion patterns of these peptides are regulated by different mechanisms and that the amount and kind of peptides mobilized by exercise may depend on the underlying diseases or pathophysiologic condition.

Adrenomedullin↗

Left ventricular structural and functional characteristics in patients with renovascular hypertension, primary aldosteronism and essential hypertension.

To investigate the effect of different etiologies of hypertension on left ventricular structure and function, we compared echocardiographic findings in 10 patients with renovascular hypertension (35 +/- 9 years), 10 patients with primary aldosteronism (42 +/- 9 years), and 14 patients with essential hypertension (41 +/- 6 years). There were no significant differences among the three groups in age, sex, body surface area, blood pressure, interventricular septal thickness, posterior wall thickness, left ventricular end-diastolic dimension or end-systolic dimension, relative wall thickness, left ventricular mass index, or spectrum of left ventricular adaptation (concentric remodeling, concentric hypertrophy, or eccentric hypertrophy). There were no differences in systolic function or diastolic function, which was assessed in terms of the peak rate of increase in dimension normalized for left ventricular end-diastolic dimension (dD/dt/D), the relaxation time, and the relaxation time to peak velocity of lengthening among groups. Multiple regression analysis showed that the systolic blood pressure was the most important determinant of left ventricular mass index (r = 0.56, P < .01), and that left ventricular mass index was the most important determinant of relaxation time and the relaxation time to peak velocity of lengthening (r = 0.48, P < .01 and r = 0.59, P < .01, respectively). The dD/dt/D was correlated only with left ventricular end-systolic dimension (r = 0.59, P < .01). Our results suggest that blood pressure may be a strong determinant of left ventricular hypertrophy, irrespective of the etiology of hypertension, and that the degree of hypertrophy may be related to left ventricular diastolic dysfunction in hypertensive patients with normal systolic function.

Adult↗

Behaviour of adrenomedullin during acute and chronic salt loading in normotensive and hypertensive subjects.

1. Responses of adrenomedullin to acute and chronic salt loading were examined in normotensive and hypertensive subjects. 2. In the acute salt load study, isotonic saline (50 ml/kg for 1 h) was intravenously infused into nine normotensive subjects and 11 patients with essential hypertension. Plasma adrenomedullin was higher in hypertensive than in normotensive subjects but was unchanged by saline infusion in either the normotensive (before infusion, 2.4 +/- 0.2 fmol/ml; after infusion, 2.4 +/- 0.1 fmol/ml) or hypertensive (before infusion, 3.0 +/- 0.1 fmol/ml; after infusion, 2.9 +/- 0.2 fmol/ml) group, while renin was suppressed and atrial natriuretic peptide was markedly increased. Plasma endothelin was not affected either. 3. In the chronic salt load study, seven normotensive subjects and 23 patients with essential hypertension underwent two 7-day periods of 30 and 260 mmol/day sodium intake. Depending on the blood pressure change, 13 hypertensive subjects were classified as salt-resistant and 10 as salt-sensitive. Salt-sensitive hypertensive subjects had suppressed plasma renin activity even during low salt intake. Plasma adrenomedullin or endothelin were not affected by the salt intake changes in any group; however, the high salt intake increased atrial natriuretic peptide in all groups. 4. These data indicate that the circulating level of adrenomedullin is not changed by either acute or chronic salt loading in normotensive subjects and patients with essential hypertension.

Adrenomedullin↗

Effect of long-term treatment with selective vasopressin V1 and V2 receptor antagonist on the development of heart failure in rats.

Vasopressin has been implicated in the pathogenesis of heart failure as one of the most potent vasoconstrictors. However, whether the increase in plasma vasopressin levels modifies the pathophysiology of heart failure remains unknown. To investigate the effect of long-term inhibition of vasopressin in the development of heart failure, we administered a selective, orally effective, nonpeptide vasopressin antagonist, the V1 receptor antagonist OPC-21268 (100 mg center dot kg-1 center dot day-1) or a V2 receptor antagonist, OPC-31260 (20 mg center dot kg-1 center dot day-1) to rats with heart failure induced by the creation of an aortocaval fistula (AVF) and to sham-operated rats for 4 weeks, beginning on the first postoperative day. The heart failure in this experiment was characterized by an increase in the weights of the right and left ventricles, the lungs, and the right and left appendage, increase in left ventricular end-diastolic pressure (LVEDP), increase in right ventricular systolic pressure (RVSP), increase in right atrial pressure (RAP), and an increase in the plasma level of atrial natriuretic peptide (ANP) as compared with no change in sham-operated rats. There were no differences in shunt ratio between treated and untreated heart failure groups. Chronic administration of the V2 receptor antagonist OPC-31260 significantly reduced the weight of the right ventricle (1.17 +/- 0.39 vs. 0.90 +/- 0.13 g/kg, p < 0.05), RVSP (53 +/- 18 vs. 39 +/- 4 mm Hg, p < 0.05), LVEDP (11.8 +/- 5.2 vs. 6.5 +/- 2.8 mm Hg, p < 0.05) and the plasma concentrations of ANP (554 +/- 271 vs. 193 +/- 39 pg/ml, p < 0.05) as compared with the values of rats with untreated HF. Chronic treatment with the V1 receptor antagonist OPC-21268 did not alter hemodynamics, organ weights, or hormone concentrations. These results suggest that vasopressin did not contribute mainly to the maintenance of systemic hemodynamics through the V1 receptor in this heart failure model. Vasopressin may play a role, at least in part, in the fluid retention in the development of heart failure through the V2 receptor. OPC-31260 may present a new approach to the treatment of heart failure.

Animals↗

Comparison of changes in cardiac structure after treatment in secondary hypertension.

To investigate the role of aldosterone and the renin-angiotensin system in cardiac structure, we performed echocardiography in patients with secondary hypertension. The relation between blood pressure or hormonal influences and left ventricular hypertrophy has not been well established in secondary hypertension. Sixteen patients with primary aldosteronism and 11 with unilateral renovascular hypertension who had completely normalized blood pressure after operation or percutaneous transluminal angioplasty were evaluated by echocardiography before and after surgery or other interventional treatment. Blood pressure was not statistically different between the groups before treatment and was normalized after treatment in both groups. Left ventricular hypertrophy was mild in both groups before treatment, and its degree was not statistically different between the groups. At the end of the follow-up period, all parameters of primary aldosteronism and left ventricular mass index in patients with unilateral renovascular hypertension were significantly reduced. In patients with primary aldosteronism, changes in end-diastolic left ventricular internal dimension correlated positively with changes in left ventricular mass index (r=.58,P<.01). In patients with unilateral renovascular hypertension, changes in mean blood pressure and left ventricular mass index were significantly correlated (r=.77,P<.01). The expanded plasma volume induced by an excess of aldosterone and high blood pressure may play an important role in the increase of left ventricular mass in primary aldosteronism. In unilateral renovascular hypertension, high blood pressure mainly contributes significantly to increased left ventricular mass. Therefore, different factors may modulate the development of left ventricular hypertrophy in patients with secondary hypertension.

Adult↗

Relationship between left ventricular geometry and natriuretic peptide levels in essential hypertension.

Previous studies have shown that plasma levels of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) are increased in essential hypertension. However, whether left ventricular geometry affects plasma ANP and BNP levels remains unknown. To investigate the effect of left ventricular geometry on plasma ANP and BNP levels in essential hypertension, we measured plasma ANP and BNP levels in 90 patients with essential hypertension. All patients were hospitalized, and fasting blood samples were obtained in the early morning after 30 minutes of bed rest. Plasma ANP and BNP levels were measured by immunoradiometric assay. Hypertensive patients were classified into four groups according to echocardiographic findings that showed normal geometry, concentric remodeling, eccentric hypertrophy, or concentric hypertrophy. Mean plasma ANP and BNP levels in all essential hypertensive patients were higher than those in age-matched normotensive control subjects. Plasma ANP levels in hypertensive patients with concentric remodeling, eccentric hypertrophy, and concentric hypertrophy were higher than in normotensive control subjects, although there were no differences between normotensive subjects and hypertensive patients with normal geometry. Plasma BNP levels tended to be higher in hypertensive patients with normal geometry, concentric remodeling, and eccentric hypertrophy than in normotensive control subjects; however, the differences were not significant. Plasma BNP levels and BNP/ANP ratio were specifically higher in concentric hypertrophy. There were significant correlations between ANP and left ventricular mass index, relative wall thickness, interventricular septal thickness, posterior wall thickness, and mean arterial pressure. Plasma BNP levels significantly correlated with relative wall thickness, interventricular septal thickness, posterior wall thickness, and left ventricular mass index but not with mean arterial pressure. In addition, plasma BNP levels were well correlated with ANP levels, and the slope for the linear regression model was steeper in concentric hypertrophy than in the other four groups. These results show that plasma ANP and BNP levels are increased in essential hypertensive patients with left ventricular hypertrophy. Furthermore, BNP secretion is augmented to a greater extent in concentric hypertrophy. Thus, measurement of plasma ANP and BNP levels may be useful for the detection of concentric left ventricular hypertrophy in patients with essential hypertension.

Adult↗

Antihypertensive therapy reduces increased plasma levels of adrenomedullin and brain natriuretic peptide concomitant with regression of left ventricular hypertrophy in a patient with malignant hypertension.

We investigated the potential role of increased plasma adrenomedullin and brain natriuretic peptide (BNP) levels in a patient with malignant hypertension. A 51-year-old man was admitted to our hospital with a chief complaint of visual disturbance. His blood pressure was 270/160 mmHg on admission. Papillary edema associated with retinal bleeding was observed. Echocardiography revealed marked concentric left ventricular hypertrophy with mild systolic dysfunction. Plasma levels of adrenomedullin and BNP were markedly elevated. Antihypertensive therapy reduced the plasma levels of adrenomedullin in association with a concomitant decrease in blood pressure. The plasma level of BNP also decreased and regression of left ventricular hypertrophy and normalization of left ventricular systolic function were observed. Our findings suggest that adrenomedullin may be involved in the defense mechanism against further elevations in blood pressure in patients with hypertension and that the plasma level of BNP may reflect left ventricular systolic dysfunction, left ventricular hypertrophy, or both, in patients with severe hypertension.

Adrenomedullin↗

Increased plasma levels of adrenomedullin in patients with heart failure.

OBJECTIVES: To investigate the role of adrenomedullin in the pathophysiology of heart failure, we measured plasma levels of adrenomedullin in patients with heart failure. BACKGROUND: Adrenomedullin is a potent hypotensive peptide newly discovered in pheochromocytoma tissue by monitoring its elevating activity on platelet adenosine 3',5'-cyclic monophosphate (cAMP). A significant level of adrenomedullin has been identified in human plasma. These findings suggest the possibility of adrenomedullin as a new circulating hormone that participates in the regulation of the cardiovascular system. METHODS: Venous blood samples at rest were obtained from patients with heart failure in New York Heart Association functional classes I (n = 15), II (n = 25), III (n = 16) and i.v. (n = 10) and from normal subjects (n = 27). Plasma adrenomedullin levels were determined by our newly developed radioimmunoassay. Other humoral factor levels measured simultaneously included norepinephrine, atrial natriuretic peptide, brain natriuretic peptide, plasma renin activity, aldosterone and cAMP. Left ventricular ejection fraction was measured by echocardiography. In eight patients with severe heart failure, plasma adrenomedullin levels were measured before and after treatment. RESULTS: The mean (+/- SD) plasma level of adrenomedullin in control subjects was 2.52 +/- 0.75 pmol/liter. Plasma levels of adrenomedullin in patients with heart failure were unaffected in those in functional class I (2.85 +/- 0.62 pmol/liter) but tended to be increased in those in class II (3.54 +/- 0.82 pmol/liter) and were significantly increased in those in classes III and i.v. (4.78 +/- 1.218 and 8.74 +/- 3.43 pmol/liter, respectively). There was a significant correlation between plasma levels of adrenomedullin and norepinephrine (r = 0.618, p < 0.001), atrial natriuretic peptide (r = 0.696, p < 0.001) and brain natriuretic peptide (r = 0.692, p < 0.001). Left ventricular ejection fraction inversely correlated with plasma adrenomedullin levels (r = 0.485, p < 0.001). Plasma adrenomedullin levels significantly decreased after treatment (from 7.40 +/- 3.40 to 3.98 +/- 1.00 pmol/liter, p < 0.05). CONCLUSIONS: These results suggest that plasma level of adrenomedullin are elevated in heart failure and that an increased plasma volume and an activated sympathetic nervous system in this condition may be related to its synthesis or secretion. Given that adrenomedullin exerts potent cardiovascular effects, increased adrenomedullin may be involved in the defense mechanism against further peripheral vascular resistance elevation in heart failure.

Adrenomedullin↗

Myocardial infarct size by serum troponin T and myosin light chain 1 concentration.

The late troponin T (TnT) peak concentration, which is known to be independent of reperfusion of the infarcted zone in acute myocardial infarction (MI), has been suggested to be correlated with clinical estimates of cardiac function and myocardial infarct size. To refine the clinical application of the late TnT peak in infarct sizing, and to examine differences in this estimation in different infarct sites, we measured the serum concentrations of TnT and myosin light chain 1 (MLC1), and compared these values with left ventricular ejection fraction (LVEF) obtained from left ventriculography, and extent score (ES) and severity score (SS) obtained from 201Tl scintigraphy in patients with anterior and inferior myocardial infarction. The late TnT peak concentration was strongly correlated with the MLC1 peak value in patients with anterior MI (r = 0.67, p < 0.05) and in those with inferior MI (r = 0.92, p < 0.0005). Furthermore, there were strong linear correlations between the late TnT peak values and all of the clinical data (LVEF; r = -0.79, p < 0.01, ES; r = 0.75, p < 0.05, SS; r = 0.75, p < 0.05, respectively) in patients with anterior MI. However, these correlations were weak in patients with inferior MI. Similar correlations were observed between MLC1 and the clinical data. Thus, TnT and MLC1 have similar kinetics in the serum at the late phase and can be used to estimate the size of anterior infarct.

Aged↗