Usefulness of serum carboxy-terminal propeptide of procollagen type I in assessment of the cardioreparative ability of antihypertensive treatment in hypertensive patients.

BACKGROUND: We investigated whether serum concentration of carboxy-terminal propeptide of procollagen type I (PIP), a marker of collagen type I synthesis, can be used to assess the ability of antihypertensive treatment to regress myocardial fibrosis in hypertensive patients. METHODS AND RESULTS: The study was performed in 37 patients with essential hypertension and hypertensive heart disease. After randomization, 21 patients were assigned to losartan and 16 patients to amlodipine treatment. At baseline and after 12 months, right septal endomyocardial biopsies were performed to quantify collagen volume fraction (CVF) on picrosirius red-stained sections with an automated image-analysis system. Serum PIP was measured by specific radioimmunoassay. Nineteen patients in the losartan group and 11 in the amlodipine group finished the study. Time-course changes in blood pressure during treatment were similar in the 2 groups of patients. In losartan-treated patients, CVF decreased from 5.65+/-2.03% to 3.96+/-1.46% (P<0.01) and PIP from 127+/-30 to 99+/-26 microgram/L (P<0.01). Neither CVF or PIP changed significantly in amlodipine-treated patients. CVF was directly correlated with PIP (r=0.44, P<0.001) in all hypertensives before and after treatment. CONCLUSIONS: These findings suggest that the ability of antihypertensive treatment to regress fibrosis in hypertensives with biopsy-proven myocardial fibrosis is independent of its antihypertensive efficacy. Our data also suggest that blockade of the angiotensin II type 1 receptor is associated with inhibition of collagen type I synthesis and regression of myocardial fibrosis in hypertensives. Thus, determination of serum PIP may be useful to assess the cardioreparative properties of antihypertensive treatment in hypertensives.

Serum carboxy-terminal propeptide of procollagen type I is a marker of myocardial fibrosis in hypertensive heart disease.

BACKGROUND: This study was designed to investigate whether the serum concentration of the carboxy-terminal propeptide of procollagen type I (PIP), a marker of collagen type I synthesis, is related to myocardial fibrosis in hypertensive patients. METHODS AND RESULTS: The study was performed in 26 patients with essential hypertension in which ischemic cardiomyopathy was excluded after a complete medical workup. Right septal endomyocardial biopsies were performed in hypertensive patients to quantify collagen content. Collagen volume fraction (CVF) was determined on picrosirius red-stained sections with an automated image analysis system. The serum concentration of PIP was measured by specific radioimmunoassay. Compared with normotensives, both serum PIP and CVF were increased (P<0.001) in hypertensives. A direct correlation was found between CVF and serum PIP (r=0.471, P<0.02) in all hypertensives. Histological analysis revealed the presence of 2 subgroups of patients: 8 with severe fibrosis and 18 with nonsevere fibrosis. Serum PIP was higher (P<0.05) in patients with severe fibrosis than in patients with nonsevere fibrosis. Using receiver operating characteristic curves, we observed that a cutoff of 127 microg/L for PIP provided 78% specificity and 75% sensitivity for predicting severe fibrosis with a relative risk of 4.80 (95% CI, 1.19 to 19.30). CONCLUSIONS: These results show a strong correlation between myocardial collagen content and the serum concentration of PIP in essential hypertension. Although preliminary, these findings suggest that the determination of PIP may be an easy and reliable method for the screening and diagnosis of severe myocardial fibrosis associated with arterial hypertension.

[Coronary revascularization surgery with arterial grafts]. / Cirugía de revascularización coronaria con injertos arteriales.

Coronary artery revascularization surgery is well established procedure throughout the world. The benefits are based on the blood perfusion through the implanted grafts distal to the coronary occlusions and continue as long as the grafts remains patent. The immediate success of this procedure is related to the surgical technique and the anatomical characteristics of the grafted coronary arteries. However, the long term results are mainly dependent on the type of grafts used. The modern era of myocardial revascularization started in the sixties with the use of saphenous vein grafts by Johnson and Favaloro. Alternative vascular conduits to the saphenous vein have been tried, and the internal mammary artery has become the first choice. In recent years, various publications have demonstrated the supremacy of the internal mammary artery over the saphenous vein when used as a single, bilateral, sequential of free graft. In order to obtain full myocardial revascularization, the use of alternatives to the internal mammary artery is required. The gastroepiploic artery, the inferior epigastric artery and the radial artery have been used as alternatives to the saphenous vein with the hope of obtaining long term results similar to the internal mammary artery.

Heparin-coated circuit in coronary surgery. A clinical study.

We performed a randomized study in 101 patients who underwent routine isolated coronary bypass graft surgery. In 50 cases an entire coated Carmeda circuit was used (coated group), and an uncoated circuit in the remaining 51 (uncoated group). A Medtronic Maxima oxygenator and a Biomedicus Biohead were used in all cases. Patients with coated circuits received low systemic heparinization with a heparin loading dose of 200 IU/kg, and 300 IU/kg for the control. Activated coagulation time was maintained at more than 275 s for the coated group versus more than 400 s for the uncoated one. The mean age of patients was 64.1 +/- 9.6 for coated and 63.5 +/- 9.7 for the uncoated group. The number of coronary grafts was 3.1 +/- 0.7 for the coated group and 3.1 +/- 0.1 for the uncoated one. Cross-clamp and bypass times were 53 +/- 14 and 98 +/- 24 min for the coated, versus 57 +/- 15 and 104 +/- 24 for the uncoated, group. Chest drainage was 989.4 +/- 509.5 ml for the coated group versus 1435 +/- 1027 for the uncoated one (P < 0.02). The amount of transfused homologous blood was 723 +/- 597 ml for the coated group versus 1071 +/- 831 ml for the uncoated one (P < 0.03). Postoperative endotracheal intubation time was 12.1 +/- 3.6 h for the coated and 14.6 +/- 4.5 h for the uncoated group (P < 0.05). Bleeding required rethoracotomy in 1/50 of the coated group, and in 4/51 of the uncoated one. Hospital mortality was 1/50 in the coated, and 4/51 in the uncoated, group. In our preliminary experience, heparin coating of an extracorporeal circuit reduces post-operative blood loss and blood transfusions in routine coronary bypass operations.

[Percutaneous mitral valvuloplasty. Immediate results with the 30 mm diameter dilatation balloon]. / Valvuloplastia mitral percutánea. Resultados inmediatos con balón de dilatación de 30 mm de diámetro.

Percutaneous balloon dilatation of the mitral valve is a promising alternative to surgical treatment for patients with mitral stenosis. We analysed echocardiographic and haemodynamic results in 62 consecutive patients who underwent mitral dilatation with a big and one chamber balloon (30 mm diameter). The relationship between the dilatation balloon area and body surface was 4.2 (in 98% of patients it was bigger than 3.5). In the whole series we get significant improvements in the haemodynamic parameters and mitral areas (0.91 cm2 versus 1.78 cm2)(p < 0.005). According to the echocardiographic score, patients were divided in two groups. Good results (mitral area > 1.5 cm2, and final, valve area 50% greater than the initial area), were obtained in 93% of patients with a score of 8 or less, and in 45% of patients with a score bigger than 8. Seventy-five percent of patients with bad results (mitral area < 1.5 cm2) were in atrial fibrillation versus 37% of patients where we get a good results. Mortality of procedure was nulle, and two patients required surgery because of procedure failure for mitral insufficiency. We can conclude: percutaneous mitral valvuloplasty with single balloon is valid alternative, and good results can be expected if there is a good relationship between the area of balloon and patient's body-surface. The echocardiographic score and presence of atrial fibrillation can predict immediate results of this technique.

[Ultrasonic decalcification of the aortic valve. Initial experience]. / Decalcificación ultrasónica de la válvula aórtica. Experiencia inicial.

We report our initial experience in 2 patients with degenerative calcific aortic stenosis who underwent ultrasonic debridement of the aortic valve. Compared with preoperative studies, doppler echocardiographic and hemodynamic evaluation before hospital discharge revealed a reduction in the mean aortic valve pressure gradient (80 and 65 mmHg to less than 10 mmHg). There was no change in aortic regurgitation grade. Follow-up doppler echocardiographic evaluation at four and six months showed no changes in gradient or regurgitation in the comparison to the postoperative data. Long-term results will show the convenience to attempt or not ultrasonic salvage of the native aortic valve in severe calcific stenosis.

[Percutaneous cardiopulmonary bypass in angioplasty and valvuloplasty. The technical considerations]. / Bypass cardiopulmonar percutáneo en la angioplastia y la valvuloplastia. Consideraciones técnicas.

To reduce problems during percutaneous transluminal angioplasties and valvuloplasties in the catheterization laboratory, percutaneous cardiopulmonary bypass was used in 6 patients (three aortic, two mitral and one coronary). Percutaneous 21 F (venous) and 17 F (arterial) cannulas were placed through the femoral vessels. Mean flows of 3 l/min were achieved with a roller pump, with a mean blood pressure of 60 mmHg. Bypass time ranged between 22 and 55 minutes (mean 39). Light intravenous sedations and spontaneous breathing was maintained in all cases. Maximum inflation time of balloons were 4 minutes for the aortic valvuloplasty patients and 50 seconds for the mitral. Two patients developed groin hematomas, and one of them required surgical exploration. Percutaneous bypass is a simple and easily achieved technique to ensure safety in the high-risk patient.

[A primary epithelioid hemangioendothelioma localized in the pulmonary valve]. / Hemangioendotelioma epitelioide primario localizado en la válvula pulmonar.

A case of epithelioid haemangioendothelioma sited at pulmonary valve, with an excrescence growing invading pulmonary artery troncus and its principal branches, in a 56-year-old woman is reported. The evolutive behavior simulated some clinical situations which made difficult the diagnosis: a mild-moderate pulmonary stenosis, a general syndrome, and, finally, an acute pulmonary thromboembolism that carried to an aggressive management which conducted to the entity diagnosis.

[Myocardial revascularization with the gastroepiploic artery. The initial experience]. / Revascularización miocárdica con arteria gastroepiploica. Experiencia inicial.

The internal mammary artery is widely recognized as the graft of choice for coronary artery bypass grafting at present. Alternative conduits have been investigated in order to find other adequate long-term grafts. The right gastroepiploic artery has been recently used as a graft to bypass distal coronary vessels. From November 1989 to April 1990 we have implanted this artery in 33 cases (32 in situ and one free grafts). The pedicled grafts were implanted in 17 patients in the main right coronary artery, in 13 we grafted the right distal branches, in one the left anterior descending, and the circumflex branch in one. The free graft was implanted in the first diagonal. Mean grafts per patient was of three in this series, with a mean of 2 arterial grafts per patient. One patient died in the early postoperative period. The remaining patients had an uncomplicated postoperative period. Thirteen patients underwent graft and coronary angiography. Direct or indirect graft patency was confirmed in all cases. The final important issue concerning the long-term patency of this graft will be solved in the future, but short-term patency rates of the right gastroepiploic artery can be anticipated when proper techniques are used.

Calcified constrictive pericarditis. Ultrasonic debridement.

A case of complete debridement of a calcified pericardium in a patient with constrictive pericarditis is reported. The use of an ultrasonic surgical aspirator facilitated disintegration of calcium without damaging the adherent epicardium and myocardium.

In situ right gastroepiploic artery. A conduit for coronary revascularization.

The internal mammary artery is widely recognized as the graft of choice for coronary artery bypass grafting at present. Alternative conduits have been investigated in order to find other adequate long-term grafts. The right gastroepiploic artery has been recently used as a graft to bypass distal coronary vessels. From November 1989 to June 1990, we have implanted this artery in 46 cases. Pedicled grafts were implanted in 20 patients to the main right coronary artery, in 21 patients we grafted the right distal branches, in 3 patients the left anterior descending, and in 2 the circumflex branches. Mean grafts per patient were 3 in this series, with a mean of 2.2 arterial grafts per patient. One patient died in the early postoperative period. The remaining patients had an uncomplicated postoperative evolution. Thirteen patients underwent graft and coronary angiography. Direct or indirect graft patency was confirmed in all cases. The final important issue concerning the long-term patency of this graft will be solved in the future, but short-term patency rates of the right gastroepiploic artery can be anticipated when proper techniques are used.

Mitral valve rupture during percutaneous dilation of aortic valve stenosis.

A 62-year-old patient underwent catheter balloon valvuloplasty for aortic valve stenosis. During the procedure, iatrogenic severe mitral regurgitation was induced, requiring emergency surgery. At operation, extensive laceration of the septal mitral leaflet was found; chordae tendinae were intact. Retrospective examination of the cineangiogram revealed the presence of balloon indentation at the chordal level during inflation, which disappeared at full inflation. Mitral valve rupture was probably related to balloon entrapment in chordae tendinae, severe chordal stretching at inflation, and subsequent valve laceration. This severe complication or aortic valvuloplasty in adults has not been reported previously and probably could be avoided by careful observation of guidewire and balloon position before inflation.