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Biomedical subjects

S Dagdelen

Publications and source records attributed to S Dagdelen.

10 recordsLinked to original sources

Follow-up of pregnancy in acromegalic women: different presentations and outcomes.

Pregnancy in acromegaly is a rather rare event since the fertility is reduced in acromegalic women. Besides, metabolic complications of acromegaly are harmful to both mother and fetus. Little is known about the outcome of pregnancy in acromegalic women. Here, we report seven cases of pregnancy out of 48 acromegalic women followed for 16 years. At diagnosis, five patients had macroadenoma, one patient had microadenoma and the size of the tumor was not documented in one patient. In one patient, acromegaly was initially diagnosed during pregnancy at 29 weeks. When she was 33 weeks, she developed pituitary apoplexy and had an emergency transsphenoidal resection of her macroadenoma during which she also had a cesarian section and delivered a healthy baby girl. In the remaining six patients, pregnancy occurred 6 to 64.5 months after the adenoma resection. Three patients received radiotherapy before getting pregnant. In three patients, pregnancy occurred during bromocriptine treatment and the drug was withdrawn. In one patient, pregnancy occurred during chronic octreotide treatment and therapeutic abortion was performed. In another patient, therapeutic abortion was performed because of uncontrolled disease. In the remaining four patients, there were neither worsening of symptoms nor tumor growth. All four patients gave birth to full-term healthy infants. Out of our seven patients, two developed gestational diabetes mellitus which was controlled with diet. None of the patients had coronary artery disease, hypertension or dyslipidemia. These cases show that pregnancy might be uneventful in acromegalic women when the disease is controlled with prior surgery and radiotherapy.

Acromegaly↗

Hyperprolactinemia of pregnancy is not associated with increased in vivo platelet activity and shortened in vitro bleeding times.

The aim of the study is to investigate whether platelet activity is increased by hyperprolactinemia during pregnancy as reflected by beta-thromboglobulin level. Forty-eight healthy, pregnant, and 30 healthy, non-pregnant women were investigated with respect to platelet count, collagen/ADP and collagen/epinephrine closure times, beta-thromboglobulin and prolactin levels. The comparison of the variables between the two groups was made by Mann-Whitney U test. The correlation analyses were performed by Spearman's rank correlation test. Our results revealed that platelet counts, collagen/ADP and collagen/epinephrine closure times and beta-thromboglobulin showed no statistically significant differences between pregnant and non-pregnant women. We found no significant correlation between prolactin and collagen/ADP closure time (r = 0.175), between prolactin and collagen/epinephrine closure time (r = -0.112) and between prolactin and beta-thromboglobulin (r = 0.220) in pregnant women. Our findings suggest that platelet activity is comparable during pregnant and non-pregnant states and there is no significant effect of prolactin on platelet function in vivo as reflected by beta-thromboglobulin level.

Adenosine Diphosphate↗

The effect of lipoprotein-a on thrombolytic therapy and spontaneous reperfusion in acute myocardial infarction. A comparative study.

BACKGROUND: To evaluate the role of serum lipoprotein-a (Lp-a) levels on the success of thrombolytic therapy (TT) in patients with acute myocardial infarction (MI). METHODS PATIENTS: 56 patients randomly allocated into 2 groups (A and B) with an approximately 1 to 2 ratio. Group A consisted of 18 patients who received 1,5 million IU streptokinase. Group B: 38 patients receiving 100 mg t-PA totally and Group C: 22 patients who did not received any TT as controls. All patients had undergone coronary angiography in the first 7 days and the degree of TIMI flow was determined in the infarct related artery with TIMI-0 and I being considered as unsuccessful perfusion, whereas TIMI-II and III as successful. Lp-a level gs;30 mg/dl was considered as high Lp-a level. RESULTS: Patency rates were similar in Group A and B, in cases with high or low Lp-a levels (p>0.05 for both). In Group C patency rate was found significantly higher in patients with high Lp-a level compared to patients with low Lp-a (p<0.01). Lp-a level in Group C was similar with Group A and B (p>0.05). The time interval for coronary angiography was similar in all groups (p>0.05 for all). CONCLUSIONS: Lp-a level does not effect the reperfusion outcome of TT in patients with MI. However in those patients who not received TT, spontaneous reperfusion rate was found significantly higher in patients with low Lp-a level compared to those with high Lp-a level.

Adult↗

Magnesium infusion dramatically decreases the incidence of atrial fibrillation after coronary artery bypass grafting.

BACKGROUND: Atrial fibrillation (AF) is one of the most common complications of cardiac surgery. Magnesium, like several other pharmacologic agents, has been used in the prophylaxis of postoperative AF with varying degrees of success. However, the dose and the timing of magnesium prophylaxis need to be clarified. The purpose of this study was to assess the effect of intermittent magnesium infusion on postoperative AF. METHODS: A total of 200 consecutive patients who had elective, isolated, first-time coronary artery bypass grafting were prospectively randomized to two groups. Patients in the magnesium group (n = 100) received 6 mmol MgSO4 infusion in 100 mL 0.9% NaCl solution (25 mL/h) the day before surgery, just after cardiopulmonary bypass, and once daily for 4 days after surgery. Patients in the control group (n = 100) received only 100 mL 0.9% NaCl solution (25 mL/h) at the same time points. RESULTS: Postoperative AF occurred in 2 (2%) patients in the magnesium group and in 21 (21%) patients in the control group (p < 0.001). Atrial fibrillation started, on average, 49.4 +/- 16.8 hours postoperatively. The postoperative length of hospital stay was not significantly different in patients with AF (7.4 +/- 8.0 days) compared with patients without AF (5.4 +/- 1.1 days; p = 0.236). CONCLUSIONS: The use of magnesium in the preoperative and early postoperative periods is highly effective in reducing the incidence of AF after coronary artery bypass grafting.

Aged↗

The response of the myocardial metabolism to atrial pacing in patients with coronary slow flow.

The pathophysiology of angina pectoris is not precisely known yet in patients who have no coronary lesion but slow coronary flow by angiography. In this study we aim to display metabolic ischemia via atrial pacing to determine the difference of lactate production and arterio-venous O2 content difference (AVO2). Thirty-four patients with slow coronary flow detected by coronary angiography via the TIMI 'frame count' method were included in this study. The resting and stress images from the patients undergoing myocardial perfusion tomography were recorded, pre and postpacing lactate extraction and AVO2 content difference values were calculated. Patients were classified according to their metabolic responses to atrial pacing stress. Group I consisted of 28 patients (18 male, 10 female, mean age 54.42 +/- 9.61) who did not demonstrate metabolic ischemia and group II consisted of six patients (four male, two female, mean age 60 +/- 5.76) who had metabolic ischemia after the procedure. There was no statistically significant difference between prepacing AVO2 content difference in group I (57.38+/-2.05%) and group II (58.23 +/- 2.11%) (P = NS). However postpacing AVO2 content difference of group I and group II was statistically significant (respectively, 57.96+/-2.65 vs. 68.35 +/- 2.15%, P < 0.001). In other words, postpacing AVO2 content difference was unchanged from the basal AVO2 content difference level in group I (respectively, 57.38 +/- 2.05 vs. 57.96 +/- 2.65%; P = NS) in contrast to the postpacing AVO2 content difference which increased significantly in group II (58.23 +/- 2.11 vs. 68.35 +/- 2.15%; P < 0.028). Although basal lactate extraction rates were similar in groups I and II (respectively, 0.24 +/- 0.1 vs. 0.23 +/- 0.18; P = NS), postpacing lactate extraction rates were decreased significantly in the two groups, prominently in group II (0.154 +/- 0.15 vs. -0.471 +/- 0.27; P < 0.0001) which indicated that lactate extraction converted to lactate production. Metabolic ischemia was detected in only 17.6% of patients included in this study and 83.4% of these six patients with proven metabolic ischemia had perfusion defects in scintigraphy. Our data confirmed that angina pectoris was not originated from myocardial ischemia in most of the patients with slow coronary flow. We conclude that perfusion scintigraphy is a reliable and accurate method for detection of true ischemia in this group of patients.

Angina Pectoris↗

Estimation of left ventricular end-diastolic pressure by color M-mode Doppler echocardiography and tissue Doppler imaging.

OBJECTIVES: The aim of this study was to estimate left ventricular end-diastolic pressure (LVEDP) noninvasively by tissue Doppler imaging and color M-mode echocardiography. MATERIAL AND METHODS: We studied 3 groups of patients who were proven by angiography to be free of significant coronary artery lesions (<40% stenosis) with an LVEDP < 10 mm Hg (group A: n = 24; 16 men, 18 women; mean age +/- SD = 55 +/- 13 years), an LVEDP of 10 to 15 mm Hg (group B: n = 21; 17 men, 4 women; mean age 56 +/- 11 years), or an LVEDP > 15 mm Hg (group C: n = 35; 20 men, 15 women; mean age 58 +/- 9 years). Tissue Doppler imaging of the lateral mitral annulus and color M-mode imaging of the mitral valve in the apical 4-chamber view were obtained with an echocardiographic system. Early and late diastolic velocities (Em and Am, respectively), Em deceleration time (EmDT), Am time (Am-t), and mitral propagation velocity time delay (VpDT) were measured in each patient. RESULTS: In group A, sensitivity and specificity for EmDT < or = 100 ms, Am-t < or = 90 ms, Em/Am > or = 1, and VpDT < or = 45 ms were found to be 0.57 and 0.89, 0.66 and 0.88, 0.86 and 0.92, and 0.73 and 0.89, respectively. In group B, sensitivity and specificity for EmDT 100 to 120 ms, Am-t 90 to 110 ms, Em/Am 1 to 0.5, and VpDT 45 to 60 ms were found to be 0.57 and 0.84, 0.69 and 0.82, 0.66 and 0.75, and 0.55 and 0.83, respectively. In group C, sensitivity and specificity for EmDT > 120 ms, Am-t > 110 ms, Em/Am < 0.5, and VpDT > 60 ms were found to be 0.88 and 0.81, 0.71 and 0.80, 0.86 and 0.72, and 0.78 and 0.86, respectively. CONCLUSION: The EmDT, Am-t, Em/Am, and VpDT measurements obtained noninvasively by left ventricular tissue Doppler imaging and mitral flow propagation velocity were found to be useful in the estimation of LVEDP.

Adult↗

Resolution of a spontaneous coronary artery thrombus with a new antiplatelet agent.

A thrombus was observed in the left anterior descending coronary artery in a 47 year-old woman who presented with acute anterior myocardial infarction. On a coronary angiogram in the right oblique cranial position, the thrombus appeared as an eccentric, solid and homogeneous mass with a 22 mm maximal length and 1.9 mm maximal diameter. The thrombotic segment and the rest of the coronary tree was free of atherosclerosis. Due to the inappropriate coronary structure and length of the thrombus, coronary angioplasty and/or stent procedures were not performed. The patient refused coronary artery by-pass. She was given the glycoprotein IIb/IIIa inhibitor tirofiban 0.4 microg x kg(-1) x min(-1) bolus over 30 minutes followed by 0.1 microg x kg(-1) x min(-1) for 24 hours, orally acetylsalicylic acid 300 mg per day, nytroglicerin 40 mg per day and warfarine with INR being in a range of 2-2.5 times. A control coronary angiography performed two months later showed total dissolution of the coronary thrombus and clearance of the culprit vessel.

Coronary Angiography↗