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Biomedical subjects

R Meijer

Publications and source records attributed to R Meijer.

At least 19 recordsLinked to original sources
PubMed1994

[Compression under ultrasonic control as treatment of a pseudo-aneurysm following catheterization in the groin].

A false aneurysm is a well known complication after catheterisation. It is increasingly seen as a result of the increase of cardiological intervention treatment. In the past the classical treatment was surgery, nowadays a expectative management is the more frequently chosen alternative. A new treatment consists of compression under color Doppler ultrasonography control. This treatment frequently leads to direct thrombosis of the false aneurysm and can be carried out on an outpatient basis.

Aged↗
PubMed1994

Inflammation of the abdominal aortic aneurysm wall.

Inflammation and fibrosis do not only appear in an "inflammatory" aneurysm, but also in "ordinary" abdominal aortic aneurysms. In this study inflammatory changes in 130 abdominal aortic aneurysms were studied and related to patients' clinical records. According to histopathological criteria five different degrees of inflammation (Histological Inflammation Scale of Aneurysms) were found and patients were classified according to these criteria: grade A or mixed acute/chronic inflammation (4.5%); grade 0 or no inflammation (16.2%); grade 1 or mild chronic (57.7%); grade 2 or moderate chronic (16.2%); and grade 3 or severe chronic inflammation (5.4%) corresponding to an "inflammatory" aneurysm. Patients with grade 3 or an "inflammatory" aneurysm were younger (p = 0.013), were all symptomatic (p = 0.02), showed no associated iliac or femoral aneurysms (p = 0.03), were only recognised peroperatively and had elevated erythrocyte sedimentation rates (p = 0.0002). No other differences could be demonstrated between sex, risk factors, cardiovascular diseases, previous abdominal operations, bacterial culture, aneurysm diameter, white blood count, cholesterol level in-hospital mortality when compared to the degree of inflammation.

Adolescent↗
PubMed1992

Effects of lip adhesion and presurgical orthopedics on facial growth: an evaluation of four treatment protocols.

Differences in craniofacial morphology in uni and bilateral cleft lip and palate were studied by roentgenocephalometry: 35 American children, treated with a lip adhesion procedure, and 26 Dutch children treated with a preoperative orthopedic procedure, both followed by a lip and/or palatal repair, were compared. A multivariate statistical approach was used to study the effects of the surgical procedures and of the age of the child when operated upon. The variables affected by the type of operation were: the relative length of the maxilla (PNS-ANS); the SNA angle; and the relative length of the mandible (Go-Po). The length of the maxilla was on average longer for those treated with preoperative orthopedics and the maxilla was largest for children whose hard palate had yet to be closed. This was also the case for the SNA angle except for children treated with the combined lip-soft palate closure procedure. The mandible followed pattern displayed by the maxillary length; it was larger for those treated with preoperative orthopedics. Significant effects of the timing of the surgery on the variables studied were also found. Postponement of the definitive lip closure resulted in a reduction of the maxillary length, whereas delay of soft palatal closure resulted in an increase of the maxillary length.

Activator Appliances↗
PubMed1984

The relationship between indoor nitrogen dioxide concentration levels and personal exposure: a pilot study.

A small, personal monitoring study was performed in a subpopulation (14 families) of a case-control study on the relationship between indoor nitrogen-dioxide exposure and respiratory diseases of schoolchildren. Mothers, schoolchildren and pre-schoolchildren were asked to carry duplicate Palmes diffusion tubes during one week. Simultaneously nitrogen-dioxide concentrations were measured in the kitchen, living room, bedroom, outdoors and--for a few participants--at school and at work. Information on time activity patterns was gathered by means of a self administered diary. Several models for estimating exposure were constructed and tested against measured exposure. The personal exposure of the participants could well be explained by models containing indoor concentrations. Models with time-weighted average concentrations did not explain personal exposure better than models containing indoor concentrations. A calculated time-weighted average exposure was found to underestimate measured personal exposure by an average 20%, probably because the average concentration in a location does not necessarily reflect the actual exposure in that location. Personal exposure of mothers and children was very similar and highly correlated, indicating that the personal exposure of the mother might be a reasonable estimate for the exposure of the child.

Adult↗
PubMed1984

Indoor nitrogen dioxide pollution and respiratory symptoms of schoolchildren.

The influence of indoor nitrogen-dioxide exposure on respiratory symptoms of schoolchildren was investigated in a case-control study. The election method used was useful in obtaining symptomatic children, but insufficient in defining cases and controls without additional information. No relationship between indoor NO2 and respiratory symptoms was found. Bias may have been present, especially because of the high mobility of the study population. Attempts to estimate historical exposure were inaccurate. Therefore the results do not exclude that an association between indoor NO2 and respiratory symptoms exists.

Air Pollutants↗
PubMed1984

Secondary repair of the bilateral cleft lip deformity.

A wide prolabial segment with a "whistling" defect used to be a common deformity following bilateral cleft lip surgery when the muscle repair was ignored. Simply revising scars often will be followed by recurrence of the deformity. An adequate muscle repair is the basis for a successful and permanent correction. The operation described in this paper includes elevation of the prolabial skin and reconstruction of the orbicularis oris muscle.

Cicatrix↗
PubMed1978

Influences of different surgical procedures on growth of dentomaxillary complex in dogs with artificially created cleft palate.

Possible detrimental effects of palate repair on dentomaxillary growth have been reported before. In our study, two principally different surgical techniques were compared. Dogs with artificially created clefts of the palate were subjected to either a periosteal flap (Langenbeck) or to a bone flap (Dieffenbach) closure. Skull roentgenograms and upper jaw impressions were used to study the possible effects on growth. Definite abnormalities were found following both procedures; there are strong indications that the bone flap is the more detrimental one.

Animals↗
PubMed1978

Lip adhesion and its effect on the maxillofacial complex in complete unilateral clefts of the lip and palate.

The use of a lip adhesion as part of the treatment program for wide complete clefts of the lip and palate is gradually being accepted. Heretofore, little mention has been made as to its actual beneficial effects. Since the introduction of this procedure by our Group in 1966, it has been used routinely by us. Its effects on the maxillofacial complex is discussed in detail.

Age Factors↗
PubMed1977

Comparison of the metabolism of testosterone undecanoate and testosterone in the gastrointestinal wall of the rat in vitro and in vivo.

The metabolism of testosterone undecanoate (TU) and testosterone (T) is studied in the gastrointestinal wall of the rat in vitro. A comparison is made with the in vivo metabolism of these compounds in the rat. The major metabolite first appearing during incubation of TU with the small intestine is T. Incubation of TU or T with the small intestine reveals a great similarity between the metabolite patterns obtained. This is also the case with the patterns derived from portal vein plasma upon oral administration of TU and T. Incubation of different parts of the gastrointestinal tract with TU or T shows that the greatest metabolic activity is located in the wall of the small intestine. Unlike T, TU is metabolized only to a small extent in the wall of the stomach and the large intestine.

Animals↗