PubMed Health⌕ Search

Biomedical subjects

C Quereda

Publications and source records attributed to C Quereda.

At least 37 records · Page 2Linked to original sources
PubMed1989

Causes of graft bruits other than of renal arterial stenosis.

Hypertension and bruit over the graft are commonly associated to renal arterial stenosis in transplant patients. However, these findings can have other origins, too. In the present work we report on two patients in whom remote arteriovenous fistulas were the cause of a spurious bruit heard over the kidney allograft.

Adult↗
PubMed1989

Serum ferritin levels after renal transplantation: a prospective study.

A prospective study was made of the evolution of serum ferritin levels in 112 renal transplant recipients with good graft function. The rise in hemoglobin value is accompanied by a decrease in basal serum ferritin levels which are lowest at the sixth month: 54.9 (2-1,516) vs. 109.6 (21-4,420) micrograms/l, p less than 0.001 (Xg and range). After this time, ferritin values increase, although they do not reach basal levels. Evolution after transplantation is mainly determined by the previous state of iron stores at the time of transplantation. While in the patients with high basal serum ferritin values these gradually decreased during the follow-up period, patients with low basal serum ferritin levels tend to replenish their iron stores after renal transplantation. These differences disappear at the third year when serum ferritin values are similar in all groups. An association between persistence of posttransplant anemia and low serum ferritin levels is observed. This event is not clinically relevant as anemia disappears in almost all cases and dietary iron is enough to normalize serum ferritin levels.

Adolescent↗
PubMed1989

Dipyridamole thallium-201 perfusion imaging for the study of ischemic heart disease in hemodialysis patients.

To assess the usefulness of dipyridamole thallium perfusion imaging in the evaluation of myocardial perfusion in hemodialysis (HD), we studied 29 HD patients divided into three groups: A) 13 patients with clinical angina, B) 8 patients without angina but similar in age, sex, time on HD and hematocrit and C) 8 young asymptomatic patients (mean age 33 +/- 9.7 years). Dipyridamole thallium-201 (Tl-201) perfusion imaging revealed myocardial perfusion defects in 8 patients (61%) from group A, 4 (50%) from group B and 1 (12.5%) from group C. These defects were localized in the inferior, posterior and septal segments of the left ventricle. Abnormal myocardial perfusion was associated with age over 50 years and aortic calcifications (p less than 0.05). Eight patients died within the following four years. All had aortic calcifications (p less than 0.001). Our results show that myocardial perfusion defects are frequent even in non-symptomatic HD patients. This suggests that ischemic heart disease could be more frequent than estimated by clinical symptoms alone. Tl-201 scintigraphy may be a useful non-invasive procedure in cardiological evaluation of HD patients.

Adult↗
PubMed1988

Allograft membranous glomerulonephritis and renal-vein thrombosis in a patient with a lupus anticoagulant factor.

A circulating lupus anticoagulant factor was detected in a 38-year-old man with end-stage renal disease and a 'lupus-like' syndrome with a diffuse proliferative glomerulonephritis. When treated with steroids, the 'lupus' complications were controlled and the anticoagulant factor disappeared; however, renal function did not recover and the patient commenced regular haemodialysis. Four months later the patient received a cadaver kidney transplant. At transplantation and during follow-up there was neither clinical nor laboratory evidence of lupus activity, but 19 months after transplantation, when steroids were tapered to a low dose, the lupus anticoagulant factor was detected, and renal-vein thrombosis complicated by sepsis led to the patient's death. A membranous glomerulonephritis was found on autopsy. This is the first time in which a (probably 'de novo') membranous glomerulonephritis has been detected in the allograft of a patient with circulating lupus anticoagulant factor.

Adult↗
PubMed1988

Hemodialysis with low-temperature dialysate: a long-term experience.

The effect of cool dialysate in hemodialysis (HD)-induced symptoms was studied in a group of 8 patients, neither diabetic nor anephric, with a high incidence of HD-induced hypotension (20-90%). Patients were studied during two consecutive periods of 6 months, the first one with dialysate at 37 degrees C (598 sessions) and the second one at 35 degrees C (599 sessions). Dialysis at low temperature was associated with a decrease in symptomatic hypotension (SH) (47.4 vs. 33.9%, p less than 0.001), a greater loss of weight during HD (1.52 +/- 0.03 vs. 1.71 +/- 0.03 kg, p less than 0.001) and stabilization of predialysis systolic blood pressure (SBP) at a lower level (144 +/- 0.69 vs. 139 +/- 0.98 mm Hg, p less than 0.001). At 37 degrees C, SH was associated with a higher ultrafiltration (1.71 +/- 0.05 vs. 1.32 +/- 0.05 kg, p less than 0.001). There was an improvement of symptoms both taken as a whole (55.6 vs. 45.8%, p less than 0.01) or one by one, cramps were the only exception as they increased at 35 degrees C (2.7 vs. 10.9%, p less than 0.001) being related with a greater weight loss at both temperatures (1.47 +/- 0.04 vs. 2.04 +/- 0.25 kg at 37 degrees C, p less than 0.001; 1.76 +/- 0.03 kg vs. 2.23 = 0.10 kg at 35 degrees C, p less than 0.001). In spite of the increase in the frequency of cramps, 7 out of 8 patients experienced some amelioration of dialysis symptoms (range between 7 and 21.4%).(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1988

Lupus-like in vitro anticoagulant activity in end-stage renal disease.

Lupus-like anticoagulant is diagnosed by a prolonged activated plasma thromboplastin time not corrected after incubation with normal plasma, prolongation of diluted tissue thromboplastin time and of diluted Russel's viper venom time, excluding factor deficiencies or specific coagulation inhibitors. We studied the presence of this 'lupus-like anticoagulant' in 100 patients with end-stage renal disease, 56 on hemodialysis and 44 on conservative treatment. 'Lupus-like anticoagulant' activity was found in vitro in the blood of 22 patients (22%) being a significantly higher prevalence than that found in 125 patients with systemic lupus erythematosus (15%) and in 50 healthy controls (0%). Hemodialysis patients showed 'lupus-like anticoagulant' activity in 30% cases, compared to 11% patients on conservative treatment. The presence of 'lupus-like anticoagulant' was unrelated with primary disease or medication received. The incidence of thrombosis in patients with this in vitro anticoagulant was higher than in patients without it (23 vs. 13%), although this difference is not significant. We conclude that prevalence of 'lupus-like anticoagulant' is high in patients with end-stage renal disease, a previously unreported observation. Its clinical and pathogenetic significance should be studied further.

Adolescent↗
PubMed1988

The importance of urinary thromboxane B2 excretion in the diagnosis of acute renal rejection.

To establish whether or not urinary excretion TxB2 is a useful parameter in the diagnosis of acute renal rejection, 45 renal transplant patients were studied and classified in four groups: Group A. Ten observations of satisfactory clinical outcome (without either acute rejection or tubular necrosis). Urinary TxB2 was initially increased but had settled to normal by the 3rd postoperative day. Two patients had subsequent increases. Group B. Twenty-five episodes of acute rejection on a previously satisfactorily functioning graft. Nineteen had increases in TxB2 values before serum creatinine increased. Group C. Five episodes of tubular necrosis without acute rejection. The evolution was similar to Group A. Group D. Nine acute episodes of rejection on kidneys with tubular necrosis. The urinary output of TxB2 was increased from the beginning. This increase was maintained until the rejection was treated. This group had the highest values of urine TxB2. The principal significance of this parameter lies in its precocity and in its utility for diagnosis of acute rejection in the graft with tubular necrosis, as the persistence of raised values of TxB2 in the urine beyond the 3rd postoperative day is highly suggestive of an acute rejection.

Acute Disease↗
PubMed1988

Influence of dialysate and membrane biocompatibility on hemodynamic stability in hemodialysis.

The contributions of membrane biocompatibility, dialysate temperature and sodium concentration to hemodynamic stability during hemodialysis were studied in 8 patients with a high incidence of hemodialysis-induced symptomatic hypotension. Patients were treated during 8 different periods, randomly ordered in each case, resulting from the combination of the following: the membrane, either Cuprophan or Polyacrylonitrile; the dialysate temperature, 37 or 35 degrees C, and the sodium concentration, 133 or 139 mmol/l. The incidence of symptomatic hypotension was lower at 35 degrees C in the entire study with either membrane and either sodium concentration. It was also lower with a sodium concentration of 139 mmol/l with either temperature and either membrane. There was a lower incidence of symptomatic hypotension when using Polyacrylonitrile, but this difference was not significant. We conclude that changes in physicochemical parameters of dialysate lead to worth-while improvement of symptomatic hypotension in hemodialysis patients, but membrane biocompatibility seems to play a minor role.

Aged↗