Search PubMed⌕ Search

Biomedical subjects

J Piessens

Publications and source records attributed to J Piessens.

At least 91 records · Page 5Linked to original sources
PubMed1980

Post-traumatic infarction due to blunt chest trauma. Report of two cases.

A myocardial infarction may be caused by a blunt chest trauma. The myocardium may be directly contused or a coronary artery may be occluded. The present paper describes a patient in whom no obstructive lesions of the coronary arteries were found after a posttraumatic infarction and a second patient with a posttraumatic occlusion of the left anterior descendents. The first patient had an abnormal connection between the right coronary artery and the circumflex artery, which is also thought to be posttraumatic.

Adult↗
PubMed1978

Value of apexcardiography for the timing of left ventricular events in man.

The time relationship between left apexcardiogram and left ventricular pressure was studied in 56 patients with heart disease. The apexcardiogram was recorded by means of a pressure transducer in 20 patients (group I). In 36 patients a displacement transducer was used (group II). The beginnings of the systolic upstroke of left ventricular pressure and left apexcardiogram were nearly simultaneous in both groups. The protodiastolic nadir of the apex tracing, however, preceeded the corresponding point on the pressure tracings by 23.8 msec in group I and 7.8 msec in group II (mean values). The peak of the first derivative of the apexcardiogram in group II preceeded the peak of the first derivative of the intraventricular pressure by a mean of 13.4 msec. In group I the time difference was small and statistically insignificant. It is concluded that apexcardiography allows an accurate determination of the onset and time course of ventricular contraction but is less precise for the determination of the protodiastolic nadir.

Blood Pressure↗
PubMed1977

Initial experience with coronary artery bypass graft surgery. A follow-up study.

The preoperative, postoperative and late follow-up data of an initial series of two hundred patients with coronary artery disease, who underwent direct coronary artery surgery, were analyzed. With increasing experience operative mortality, postoperative complications, graft closure and perioperative myocardial infarction showed a definite decrease. Patency rate was definitely related to symptomatic relief, return to work, postoperative exercise tolerance, and the absence of perioperative myocardial infarction.

Angina Pectoris↗
PubMed1976

Normalized first derivative ofthe left apex cardiogram in assessment of left ventricular function.

The relation between the left displacement apex cardiogram and the left ventricular pressure during isovolumic contraction was studied in 30 patients with cardiac disease. Using the instantaneous relation between the first time derivative and the magnitude of both the left apex cardiogram and the left ventricular pressure, normalized derivatives were obtained. These noramized velocities were correlated with each other and with several indexes of left ventricular function. The normalized derivatives of the left apex cardiogram (dD/dt/D) and the left ventricular pressure (dP/dt/P) were similar in magnitude, standard deviation and variation coefficient. No such similarity was present when the first time derivatives of each tracing (dD/dt and dP/dt) were compared. A highly significant relation was found between normalized displacement velocity and normalized pressure velocity using both total (r = 0.76, P less than 0.001) and developed (r = 0.75, P less than 0.001) displacement and pressure. Significant correlations with several other indexes of left ventricular function (end-diastolic pressure, peak dP/dt, maximal velocity of the contractile elements at zero load[Vmax]) were also observed. It is concluded that the index dD/dt/D of the left apex cardiogram is an important noninvasive tool for assessing left ventricular function in man.

Adult↗
PubMed1976

Anomalous coronary arterial pattern.

The clinical history of an adult patient with anginal-like pain is described. A coronary angiography revealed the existence of a hypoplastic left coronary artery, a right coronary artery which passed around the posterior surface of the heart and continued into the anterior surface of the heart to give off an anterior descending artery and the presence of a "conus" artery. The embryonic genesis of hypoplastic coronary artery and of a similar aberration, single coronary artery, are discussed.

Angiography↗
PubMed1975

A comparison of systolic time intervals derived from the central aortic pressure and from the external carotid pulse tracing.

In 26 patients a direct comparison was made of systolic time intervals derived from the right and left external carotid pulse tracing and from the central aortic pressure, simultaneously recorded by means of a catheter-tip micromanometer. In addition, the delay time (required for pulse wave transmission to the neck) of the upstroke (DUEC) and incisura (DIEC) of the external carotid pulse tracing was studied. The influence of changes in heart rate on these intervals was evaluated by right atrial pacing. At resting frequencies DUEC exceeded DIEC by 4 to 4.5 msec (P less than 0.005). Increasing heart rate did not influence DUEC but prolonged DIEC. Differences between DUEC and DIEC were associated with a decrease and reversal with increasing heart rate (tau = 0.52, on the right carotid pulse; tau = 0.65, on the left pulse). Internally and externally measured left ventricular ejection time and pre-jection period were strongly correleated. Significant differences in absolute values were also observed. Whether these differences were positive or negative was dependent on heart rate. At rest external left ventricular ejection time was 4 to 4.5 msec (P less than 0.005) shorter, external pre-ejection period 5.5 to 6 msec (P less than 0.005) longer than corresponding intervals measured internally. At heart rates above plus or minus 100 beats/min the relationships were reversed. No significant differences could be demonstrated between these intervals measured on the right and left external carotid pulse.

Adult↗
PubMed1975

A direct comparison between internally and externally measured left ventricular systolic time intervals.

In 38 cardiac patients a direct comparison was made of systolic time intervals derived from the external carotid pulse tracing and from the central aortic pressure curve, simultaneously recorded by means of a catheter-tip micromanometer. In addition the transmission time of the upstroke and the incisura of the central pulse wave to the carotid artery was studied. In spite of close linear correlations, significant differences in absolute values were observed between internally and externally measured systolic time intervals. The transmission times of upstroke and incisura of the pulse wave also differed significantly. Both findings were directly related and dependent upon the heart rate.

Adult↗