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V Piazza

Publications and source records attributed to V Piazza.

53 records · Page 3Linked to original sources
PubMed1983

[Respiratory response and acid-base equilibrium in acetate dialysis and bicarbonate dialysis].

In order to elucidate the mechanisms responsible for the hypoxemia observed during acetate dialysis, but not found during bicarbonate dialysis, the authors studied ventilation, blood gases and their exchanges in the lungs and across the dialyzer on 9 patients. Oxygen consumption was similar both in acetate and bicarbonate dialysis. At the beginning of acetate dialysis, hypocapnia, due to CO2 losses through the dialyzer, causes hypoventilation and hypoxemia; afterwards, the worsening of acidosis (due to bicarbonate losses) stimulates ventilation, thus correcting the initial imbalance. Authors also hypothesize a pulmonary mechanism for CO2 "sparing" contributing to compensate CO2 losses through the dialyzer. The absence of hypoxemia during bicarbonate dialysis would be due to the absence of CO2 losses through the dialyzer.

Acetates↗
PubMed1983

Pressure and humoral changes induced by atenolol and hydrochlorothiazide + amiloride, alone and in free combination. A comparative between-patient study.

The authors have performed a between-patient study in 76 patients with mild or moderate essential arterial hypertension, with the aim of comparing the results of atenolol 100 mg daily, hydrochlorothiazide 50 mg + amiloride 5 mg 1 tablet daily, and the combination of the above two agents at the same daily doses. Thirty-one patients received the free combination diuretic-beta-blocker throughout the study period; 26 patients non-responders to atenolol 100 mg daily (supine diastolic blood pressure greater than 90 mmHg) after a one-month treatment period received the above combination for a further four months; and 19 patients non-responders to hydrochlorothiazide 50 mg + amiloride 5 mg, 1 tablet daily, after a one-month treatment period received the above combination for a further four months. In the patients who were non-responders to either atenolol or the diuretic, supine and upright blood pressure showed a further and clinically consistent decrease as a result of the combination therapy. A similar consistent decrease was seen in the patients receiving the combination therapy throughout the study. Plasma levels of glucose, urea, creatinine, sodium, potassium and uric acid were not modified either by the single agents or during administration of the combination therapy. In particular, plasma potassium concentration did not show any statistical or clinical changes. Any side-effects were of little clinical importance and never required discontinuation of therapy. In conclusion, atenolol combined with hydrochlorothiazide + amiloride (100 mg + 50 mg + 5 mg) provides an effective and well tolerated blood pressure control in most patients with mild or moderate arterial hypertension, including non-responders to diuretic or beta-blocker alone.

Adult↗
PubMedDate not supplied

Evaluation of separate renal function by means of 99mTc-aprotinin uptake test.

The possibility that relative kidney uptake of technetium-99m aprotinin (TcA) might be indicative of separate renal function was investigated in 89 patients who underwent both effective renal plasma flow (ERPFs) and glomerular filtration rate (GFR) determination. A reference group consisted of 27 healthy volunteers, studied only with TcA. The correlation with ERPFs (r = .73) was similar to that previously reported and confirmed. The correlation with GFR (r = .68) was better if a subgroup of renal units with TcA uptake lower than 16% (lower normal limit) was considered. Most likely, glomerular filtration is a limiting factor of the tubular uptake of TcA, and when GFR is reduced, both parameters decrease in the same manner, while if GFR is normal the two parameters are relatively independent. The correlation between TcA and GFR in 32 children was very similar to that found in adults. TcA uptake test seems to be a useful indicator of separate renal function, providing morphological information at, the same time.

Adolescent↗
PubMedDate not supplied

Presence and distribution of serotonin immunoreactivity in the cyprids of the barnacle Balanus amphitrite.

In this work, the presence and distribution of serotonin in the cyprid of the barnacle Balanus amphitrite were investigated by immunohistochemical methods. Serotonin-like immuno-reactive neuronal cell bodies were detected in the central nervous system only. Various clusters of immunoreactive neuronal cell bodies are distributed in the brain (protocerebrum, deutocerebrum, optical lobes), and at least, four pairs of neuronal cell bodies were detected in the centrally positioned neuropil of the posterior ganglion. Rich plexuses of immunoreactive nerve fibers in the neuropil area were also observed. Furthermore, bundles of strongly immunoreactive nerve fibers surrounding the gut wall were localized, and immunoreactive nerve terminals in the antennules and compound eyes were observed. These data demonstrate the presence of a serotonin-like immunoreactive substance in the barnacle cyprids; furthermore, its immunolocalization in the cephalic nerve terminals allows us to postulate the involvement of this bioactive molecule in substrate recognition during the settlement process.

Animals↗