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P L DiMarco

Publications and source records attributed to P L DiMarco.

6 recordsLinked to original sources
PubMed1988

Role of angiotensin II in renal hemodynamic functions during the initial stages of acute ureteral obstruction.

This investigation examines the role of Angiotensin II in renal hemodynamic functions during acute unilateral ureteral obstruction (UUO) in a dog model. An electro magnetic flow probe was utilized to assess renal blood flow while the arteriovenous extraction technique of technetium 99m DTPA was utilized for the assessment of changes in filtration fraction and glomerular filtration rate. The effects of Angiotensin II receptor blockade on renal hemodynamic functions during acute UUO was evaluated in six dogs and compared to acute ureteral obstruction without receptor blockade in seven dogs. Angiotensin II blockade with (Sar1, Thr8)-Angiotensin II during UUO led to a striking increase in renal blood flow that was significantly different in comparison to normalized values from UUO alone (+delta 63 +/- 17 vs. +delta 22 +/- 6% at 30 min; p less than 0.05). There were, however, no significant differences in the magnitude of the decrease in filtration fraction and glomerular filtration rate in comparison to UUO alone. This investigation demonstrates that Angiotensin II has an inhibitory effect on the initial increase in renal blood flow with acute UUO. The possibility of successful pharmacologic intervention in the setting of UUO can be examined using animal models similar to the one described here. Pharmacologic treatment in the setting of acute UUO in patients might permit better preservation of renal function.

Angiotensin II↗
PubMed1986

Acute systemic and renal hemodynamic effects of meglumine/sodium diatrizoate 76% and iopamidol in euvolemic and dehydrated dogs.

We examined the acute systemic and renal hemodynamic effects of intravenous meglumine/sodium diatrizoate-76% and iopamidol in euvolemic and dehydrated dogs. The physiologic responses were compared with acute changes in the level of an endogenous heparin-like material (EHM). One of eight dehydrated dogs receiving diatrizoate (2 ml/kg) had an immediate vomiting reflex associated with a very significant decline in all measured renal hemodynamic parameters; none of eight dehydrated dogs receiving iopamidol experienced a similar reaction. EHM levels did not correspond to the magnitude of the physiologic responses following either iopamidol or diatrizoate. Significant differences between iopamidol and diatrizoate were noted when comparing the magnitude of the decrease in systemic pressure (- delta 3.8 +/- 3.02, iopamidol, n = 8; vs. - delta 19.4 +/- 7.3 mm Hg, diatrizoate, n = 8; P less than .03), increased renal plasma flow (+ delta 6.2 +/- 4.9, iopamidol, n = 8; vs. + delta 33.7 +/- 8.0 ml/min, diatrizoate, n = 8; P less than .05), and decreased filtration fraction (- delta 0.09 +/- 0.01, iopamidol, n = 8; vs. - delta 0.14 +/- 0.02, diatrizoate, n = 8; P less than .03). There was no significant difference in the decrease in glomerular filtration rate (- delta 7.4 +/- 1.0, iopamidol, n = 8; vs. - delta 9.3 +/- 1.3, diatrizoate, n = 8; P greater than .05), since the marked drop in filtration fraction occurring with diatrizoate was counterbalanced by the marked increase in renal plasma flow. Acute systemic and renal hemodynamic effects are significantly lessened when comparing iopamidol with diatrizoate.

Animals↗
PubMed1985

Glomerular filtration response to acute ureteral obstruction in the dog.

In order to assess the glomerular filtration responses to acute ureteral obstruction in the dog we employed an established method that does not require timed urine collections. Our results show a 57 per cent increase in renal blood flow (baseline: 203.8 +/- 50.9 vs. 319 +/- 69.4 ml./min. at 105 minutes; no. = 7) that was associated with a monophasic decrease in filtration fraction to -70 per cent at 120 minutes (0.26 +/- 0.025 vs. 0.08 +/- 0.007) and an increase in ureteral pressure to 63.1 +/- 6.1 mm. Hg at 120 minutes. A biphasic GFR response was noted with an initial small increase (baseline: 32.5 +/- 7.5 vs. 36.3 +/- 11.0 ml./min. at 2 minutes) followed by a continual decline to -55 per cent at 120 minutes (to 14.5 +/- 2.6 ml./min.). This investigation has confirmed the results of micropuncture studies showing maintenance of GFR early after complete ureteral ligation.

Animals↗
PubMed1985

Renal trauma: evaluation by computerized tomography.

The diagnosis and appropriate management of patients with renal trauma have remained controversial. From July 1981 to June 1984 we evaluated with computerized tomography 22 selected patients suspected of sustaining major renal trauma. Of these patients 17 were managed successfully with conservative therapy and 5 underwent surgical exploration. Only 2 patients required arteriography because of excellent renal delineation provided by computerized tomography scanning. Computerized tomography provides the most precise anatomical detail of renal injuries as well as valuable information regarding other retroperitoneal and intra-abdominal structures, often resulting in the identification of associated and unsuspected injuries. We advocate the use of computerized tomography as the primary diagnostic modality in patients suspected of sustaining major renal injury and/or other organ injuries. This change in diagnostic studies has facilitated greatly the diagnosis and treatment of kidney injuries.

Adolescent↗
PubMed1984

Direct fibrinolytic therapy for renal vein thrombosis: radiographic followup.

Renal vein thrombosis is a rare entity whose true incidence is unknown. The disease occurs most frequently in patients with the nephrotic syndrome but it also can occur in the presence of other hypercoagulable states. Previous modes of therapy have been limited to systemic anticoagulation or surgery. We report a case of successful dissolution of acute renal vein thrombosis using direct fibrinolytic therapy, which was documented radiographically during treatment and at 3-month followup.

Female↗