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Biomedical subjects

D de Caleya

Publications and source records attributed to D de Caleya.

5 recordsLinked to original sources
PubMed1985

Left atrial ball thrombus.

The existence of a freely-floating thrombus in the left auricle is a rare finding in mitral pathology. Diagnosis by two-dimensional echocardiography has been described by various authors (1, 2, 3). In our case echocardiographic diagnosis of auricular thrombus was not possible at the beginning, given the bad ultrasonic window. Only when the thrombus floated freely in the left auricle it was detected in the region of the mitral valve, in spite of the bad ultrasound window.

Aortic Valve Insufficiency↗
PubMed1976

[Methodical aspects of pneumatic segment plethysmography. III. Measuring tourniquet problems].

The question, to which extent utilization of different plethysmographic cuffs influenced the assessment of volume changes, was examined in 40 healthy individuals as well as by means of an experimental model. It could be shown that plethysmographic results varied significantly according to the design of the cuffs: 1.a) Utilization of short (19.5 cm) cuffs that did not cover the entire thigh circumference resulted in significantly lower arterial inflow and pressure-dependent venous capacity measurements as compared to long cuffs (48.8 cm). b) This result was confirmed by use of a newly developed "calibration-cylinder" demonstrating that use of the short cuff showed only 62.2% of the true volume change, use of the long cuff, however, 89.6%. Deficiency of thigh contact is discussed as possible etiologic factor for this difference. 2. The cover material of the cuff also influenced the results significantly since results could be improved from 62.2% to 86.9% (short cuff) and from 89.6% to 95.1% (long cuff) by use of double layer non-compliant cloth. The reason for this finding is thought to be the compliance of conventional cloth. 3. Comparison of two cuffs with identical shape and dimensions resulted in significantly lower volume changes using hard stiff rubber as compared to soft compliant rubber. These findings suggest some recommendations for optimal design of plethysmographic cuffs. Cuffs should not underestimate volume changes obtained with the "calibration-cylinder" by more than 10%.

Adult↗
PubMed1975

[Methodical aspects of pneumatic segment plethysmography. I. The problem of posture and distal venous occlusion].

Pneumatic segment-plethysmography was used to investigate the influence of the position and of distal venous occlusion on the arterial inflow to the calf and on the pressure-dependent venous capacity. It was demonstrated that (1) two of three investiaged positions have no significant influence on the arterial inflow to the calf; (2) the pressure-dependent venous capacities, however, show statistically significant differences related to position of the leg. The following reasons for these results were discussed: the varying tension of the surrounding tissue of the vessels, the basic volumes and the relation of intravenous pressure and the flexibility of the vessels. (3) It could be shown that the arterial inflow at rest measured without distal venous occlusion is significantly higher than the flow measured with distal venous occlusion. (4) On the contrary distal venous occlusion is of no importance in reactive hyperemia after 3 minutes of arterial obstruction. The arterial inflow to the following distal tissue was assumed to be the reason of these findings.

Blood Pressure↗
PubMed1975

[Methodical aspects of pneumatic segment plethysmography. II. The problem of cuff width and cuff-pressure].

Pneumatic segment-plethysmography was used to investiage the influence of different cuff-widths and cuff-pressures on arterial inflow to the calf. It was demonstrated that 1. using consistently 80 Torr for the small respectively 50 Torr for the wide cuff no significant difference for small suprapatellar thigh-circumferences was found. On the contrary for large suprapatellar thigh-circumferences there was a statistically significant difference of the arterial inflow; 2. using both cuffs for all thigh-circumferences, a confirmity of arterial inflow was found if a coupling-factor was individually calculated in each case from upper arm- and thigh-pressure; 3. the arterial inflow to the calf did not differ at pressures of 42 Torr and 50 Torr, whereas at 70 Torr arterial inflow was significantly diminished.

Adolescent↗