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Biomedical subjects

N Ghaed

Publications and source records attributed to N Ghaed.

At least 19 recordsLinked to original sources
PubMed1987

Masked obstruction of the renal collecting system.

Two cases of apparent unilateral renal obstruction in which lesser contralateral obstructions were not seen are presented. In both cases, relief of the more severe obstruction resulted in an unmasking of the milder contralateral lesion.

Adult↗
PubMed1987

The variable anteroposterior position of the retroperitoneal colon to the kidneys.

Five hundred supine abdominal CT scans were reviewed retrospectively to determine the variation of colonic position about each kidney. The anteroposterior position of the retroperitoneal colon was evaluated for different age groups and sexes at the level of the upper-, mid-, and lower-renal poles. The ascending/descending colon generally assumed a more posterior position about the lower poles and left kidney vs. the upper poles and right kidney. There were few significant differences between the sexes and among different age groups with two exceptions. In middle-aged and older women, the descending colon lay more lateral to the left lower kidney than in their male counterparts. Second, although the colon was located behind the kidney (retrorenal colon), in a nearly equal number of men and women, most patients with this colonic position were 60 years of age or older and had it about their lower renal poles. The overall frequency of retrorenal colon in the supine patient was 1.9%.

Adolescent↗
PubMed1987

The retrorenal colon in the supine and prone patient.

Ninety patients underwent computed tomographic scanning in both the supine and prone positions to show the orientation of the retroperitoneal colon about the kidneys and allow evaluation of changes in colonic position and contents. The data were compared with data on 500 patients scanned only when supine. Particular attention was given to bowel found posterior to the kidneys (retrorenal colon): its frequency of occurrence on 500 scans of supine patients was 1.9%, but 10.0% in the 90 prone patients. Because most invasive renal procedures would not intersect with retrorenal colon located behind the lateral one-third of the kidney, the data were reevaluated after deletion of these patients, giving a frequency in prone patients of 4.7%. This was found exclusively at the level of the lower renal poles, and the involved colon was extensively distended with gas. Attention should be given at fluoroscopy to detect this unusual, posteriorly positioned, air-filled colon before any invasive renal procedure.

Adult↗
PubMed1985

Poland-Möbius syndrome: evaluation by computerized tomography.

The Poland-Möbius syndrome is the combination of two rare congenital disorders and has been reported previously in only 13 patients. We report two additional cases with an evaluation of the findings and possible pathogenesis, and discuss the role of computerized tomography in evaluating the brain, pons, orbits, and facial nerve.

Abducens Nerve↗
PubMed1984

Hyperalimented lung diagnosed by perfusion scan.

Injection of radiopharmaceutical through a catheter may be useful in localizing its placement. A case is described in which a central venous line had punctured to superior vena cava, delivering hyperalimentation solution into the right pleural space.

Adult↗
PubMed1984

Gas washout and pressure waveform characteristics of high-frequency oscillation.

High-frequency oscillation (HFO) minimizes tidal volume. To investigate whether ventilation can proceed when tidal movement (volume) is eliminated, a nondistensible physical model of interconnected chambers was constructed. During HFO, ventilation was related to pressure waveform characteristics recorded within the separate chambers. Ventilation increased up to a critical frequency related to the time constant of the system. Beyond this frequency, ventilation dropped off rapidly.

Humans↗