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Biomedical subjects

H B Patriquin

Publications and source records attributed to H B Patriquin.

13 recordsLinked to original sources
PubMed1992

Infantile hepatic hemangioma: Doppler US.

The duplex Doppler ultrasound (US) characteristics of 13 infantile hepatic hemangiomas were reviewed to assess the utility of these characteristics in diagnosis and follow-up. Clinical correlation was available for all children, with a histologic diagnosis established in three. A variety of tumoral flow patterns were demonstrated, including arterial and venous signals with high-frequency shifts, arteries with little systolic-diastolic flow variation, and low-frequency arterial and venous signals. Follow-up studies in 12 infants documented slower flow within the tumors; one child underwent immediate surgery without follow-up examination. The Doppler US characteristics of infantile liver hemangiomas are variable and overlap with those described in the literature for malignant tumors. Doppler US is most useful in follow-up by allowing monitoring of changes in flow within tumors after therapeutic embolization or conservative management.

Blood Flow Velocity↗
PubMed1992

Stenosis of the renal artery: assessment of slowed systole in the downstream circulation with Doppler sonography.

Slowing and dampening of systole in the arterial network distal to stenosis is a well-known Doppler sign of severe arterial stenosis. To determine whether this sign is present in boys and girls with such stenosis, intrarenal Doppler curves (acceleration index [AI] and resistive index [RI]) were compared with findings on renal arteriograms in 20 boys and girls; the AI was also measured in 10 boys and girls without renal disease. Statistical analysis of AI and RI measurements was performed. Eleven of 32 renal arteries were normal. The normal AI was 4.0-7.0; in arteries with greater than 75% stenosis, the AI was 0.7-1.7. In five arteries studied after angioplasty, the AI had changed from 0.7-1.5 to 4.0-5.6 at the first posttreatment examination (performed 28 hours to 1 week after angioplasty), and it remained normal during the 3-year follow-up period. In kidneys with stenotic arteries, the RIs were lower (0.43-0.54) than in healthy subjects (0.56-0.63). Regression and correlation coefficients of AI and RI measurements were statistically significant, and discrimination between normal arteries and those with greater than 75% stenosis was excellent.

Child↗
PubMed1991

Doppler sonography in renal diseases.

Using Doppler sonography, the circulation of the kidney can now be studied in the living person in various physiologic or pathologic situations. Our understanding of renal hemodynamics, gleaned from experimental animal models as well as human studies, is being enhanced by Doppler examination and the clinical uses are expanding. Some early concepts, sometimes hastily postulated, are being questioned. The highlights of ongoing debates and the results of animal studies that further our understanding of Doppler examinations in patients are the subject of this review.

Doppler Effect↗
PubMed1990

Normal portal venous diameter in children.

A study was conducted on 156 children, in whom the portal veins were measured using standard real time ultrasonography. Knowledge of the normal dimension may be important in patients with liver disease.

Adolescent↗
PubMed1989

Hemolytic-uremic syndrome: intrarenal arterial Doppler patterns as a useful guide to therapy.

Seventeen children with acute renal failure due to the hemolytic-uremic syndrome were examined with duplex Doppler ultrasound. Serial measurements of intrarenal arterial pulsatility were obtained by means of the Pourcelot index. These were compared with daily urine volume, both during the phase of renal failure (during which most of the children were undergoing peritoneal dialysis) and during recovery of renal function. During oliguria or anuria there was either no intrarenal arterial flow (ie, absent Doppler shifts), or absent, reversed, or markedly reduced diastolic flow. Within 24-48 hours after diastolic Doppler shifts returned to normal, diuresis occurred. The Doppler examination enabled prediction of recovery and allowed dialysis treatment to be abbreviated or, in some cases, canceled.

Acute Kidney Injury↗
PubMed1985

Medullary sponge kidney in childhood.

Medullary sponge kidney is reported in six children aged 2-18 years. One child was asymptomatic; the others had hematuria or a urine-concentrating defect. Renal function and size were otherwise normal, as was liver function. The diagnosis was made at excretory urography according to criteria established in adults. Sonography revealed hyperechogenic pyramids, at first at the periphery, later generalized. Computed tomography proved this to be calcium. Medullary sponge kidney is rare but exists in children. Sonography is very sensitive to the pyramidal nephrocalcinosis that complicates this disease and explains the frequent presenting symptom of hematuria in these children.

Adolescent↗
PubMed1984

Late sequelae of juvenile rheumatoid arthritis of the hip: a follow-up study into adulthood.

A 4-13 year follow up study of 29 patients with juvenile rheumatoid arthritis into adulthood revealed several structural deformities of the hips: coxa magna, short femoral neck, subluxations associated with large cyst-like erosions of femur and acetabulum near the ligamentum teres and a flattened, wide femoral head (without steroid treatment). The deformities evoke the possibility of ischemia of the femoral head in the presence of active, compressive synovial proliferation during the growth period in a joint with largely intra-articular nutrient vessels.

Adolescent↗
PubMed1977

Neonatal intussusception. Report of 12 cases.

Twelve cases of neonatal intussusception are presented and another 25 taken from the literature are reviewed. Intussusception in the first month of life is a distinct clinical and pathological entity, presenting as bowel obstruction in the first days and usually led by a tumor. In the past, a high mortality rate has been related to late diagnosis. The barium-enema examination is diagnostic.

Female↗
PubMed1977

Neonatal mucolipidosis II (I-cell disease): clinical and radiologic features in three cases.

Three unrelated southern Italian children manifested I-cell within the first month of life, but it was not recognized initially. Radiologic findings of osteopenia, subperiosteal new bone formation and resorption, and irregular metaphyses suggested systemic bone disease. Premature suture synostosis was evident at age 2-4 weeks. Review of the literature and experience with these cases establish these findings as valuable and specific clue to the diagnosis of I-cell disease. By 6-10 months of age, the clinical and radiologic features were similar to those in Hurler syndrome. Cardiorespiratory death occurred in two cases.

Female↗
PubMed1976

The right pleuromediastinal reflection in children.

The authors review the anatomy of the pleural reflection of the right lung against the middle mediastinum in childhood. In 505 consecutive normal frontal radiographs of children, from birth to sixteen years, this pleural reflection (also known as the pleuro-esophageal line) was visible in 83%. The entire reflection from thoracic inlet to diaphragm was clearly seen in 13%, chiefly in upright, deep-inspiration, well penetrated radiographs. It is a radiographic landmark in the middle mediastinum, particularly well seen in childhood, and its use in assessment of mass lesions, cardiomegaly and lung collapse is described.

Adolescent↗