Biomedical subjects

Kouichi Tamano

Publications and source records attributed to Kouichi Tamano.

4 recordsLinked to original sources

PubMed2004

[Effect of hemodialysis on peak velocity of early diastolic mitral annulus motion].

OBJECTIVES: Peak velocities of early diastolic mitral annulus motion (Ea) assessed by tissue Doppler imaging are relatively preload independent. Whether Ea decreases after hemodialysis or not is unclear. This study investigated the effect of hemodialysis on Ea. METHODS: The study group consisted of 23 hemodialysis patients without organic heart disease. Echocardiography was performed before and after hemodialysis, and Ea was compared with the peak velocity of early mitral inflow (E). Decreases in the body weight, E and Ea were calculated as indexes of decrease by hemodialysis. RESULTS: After hemodialysis, E decreased significantly (p = 0.005) but Ea did not change (p = 0.09). The decrease in Ea was significantly smaller than that in E (p < 0.0001). The decrease in E correlated significantly (r = 0.52, p < 0.05) with the decrease in the body weight, but the decrease in Ea did not correlate with the decrease in the body weight. CONCLUSIONS: Ea is little affected by hemodialysis compared with E. The effect of hemodialysis on Ea can be ignored if the amount of fluid removal is small.

Aged↗

PubMed2003

Multiple left ventricular diverticula detected by second harmonic imaging: a case report.

A 51-year-old Japanese man was admitted to hospital for evaluation of anterior chest pain at rest. He had a past history of cerebellar infarction when he was 47 years old. A conventional 2-dimensional echocardiogram revealed normal left ventricular function, and no abnormal findings. However, second harmonic imaging demonstrated 2 noncontractile diverticula at the submitral annular portion of the posterior wall of the left ventricle. Second harmonic imaging revealed another contractile diverticulum at the anterior wall of left ventricle in the short-axis view. These findings were confirmed by left ventriculography. After confirming the diagnosis of multiple left ventricular diverticula, a rare type of congenital anomaly, anticoagulant therapy was started and he is well to date. Left ventricular diverticula are clinically very important because they are often associated with serious complications such as systemic thromboembolism. Enhancement of the left ventricular endocardial borders by second harmonic imaging is useful for the diagnosis of left ventricular diverticula.

Anticoagulants↗

PubMed2003

[Myocardial systolic function of the left ventricle along the long axis in patients with essential hypertension: a study by pulsed tissue Doppler imaging].

OBJECTIVES: Myocardial contractility of the left ventricle along the long axis in hypertensives is not well characterized. The systolic velocities of the left ventricular myocardium along the long axis were measured by pulsed tissue Doppler imaging in patients with mild to moderate essential hypertension. The relationships between the systolic velocity of left ventricular myocardium along the long axis and the blood pressure, and the left ventricular geometry were investigated. METHODS: The study included 60 untreated hypertensive patients (hypertension group) and 59 age-matched healthy subjects (control group). M-mode echocardiograms were recorded, and the relative wall thickness, left ventricular mass index and left ventricular end-systolic stress were calculated. The peak systolic velocities of the left ventricular posterior wall motion (Sw) were measured by pulsed tissue Doppler imaging. RESULTS: The Sw was significantly lower in the hypertension group than in the control group (8.3 +/- 1.9 vs 9.2 +/- 2.0 cm/sec, p < 0.05). The Sw was correlated inversely with systolic blood pressure (r = -0.31, p < 0.005), diastolic blood pressure (r = -0.25, p < 0.0001), interventricular septal thickness (r = -0.41, p < 0.0001), left ventricular posterior wall thickness (r = -0.39, p < 0.0001), relative wall thickness (r = -0.33, p < 0.001), and left ventricular mass index (r = -0.37, p < 0.001) in all subjects. CONCLUSIONS: The systolic velocity of the left ventricular myocardium along the long axis is decreased in patients with mild to moderate essential hypertension, and is negatively correlated with blood pressure and the severity of left ventricular concentric hypertrophy.

Adult↗

PubMed2002

[Assessment of left ventricular function by midwall fractional shortening in hemodialysis patients].

OBJECTIVES: Midwall fractional shortening (MFS) is a useful index to evaluate left ventricular myocardial function in patients with essential hypertension. The study investigated the prevalence and characterization of low MFS in hemodialysis patients. METHODS: MFS was calculated from M-mode echocardiograms in 67 patients (34 males, 33 females) receiving maintenance hemodialysis in whom fractional shortening was normal. Plasma levels of atrial and brain natriuretic peptides were also measured in these patients before and after hemodialysis. MFS was evaluated by stress-corrected MFS (ratio of observed to predicted MFS). The relationship of MFS to circumferential end-systolic stress in 122 healthy subjects was used to calculate the predicted MFS. RESULTS: Stress-corrected MFS was depressed in 18 of the 67 patients (26.9%). In the low MFS group, duration of hypertension was significantly longer (p < 0.05), wall thickness was significantly greater (p < 0.001), left ventricular dimension was significantly smaller (p < 0.0001), and relative wall thickness was significantly greater (p < 0.0001) than in the normal MFS group. Reduction of brain natriuretic peptide level by hemodialysis in the low MFS group was significantly higher (p < 0.05) than in the normal MFS group. CONCLUSIONS: Depression of stress-corrected MFS may be common in hemodialysis patients. Long duration of hypertension and concentric geometry of the left ventricle occur in patients with low MFS.

Aged↗