Effect of discontinuation of ticagrelor and switching-over to other P2Y12 agents in patients with acute coronary syndrome: a single-center real-world experience from India

Background

Dual antiplatelet therapy is the current standard of care after acute coronary syndrome (ACS) and percutaneous coronary intervention (PCI). We intended to study the pattern of use of ticagrelor in patients with acute coronary syndrome undergoing PCI and the effect of switching over to other P2Y12 receptor inhibition on clinical outcomes.

Results

All patients aged > 18 years who had been admitted with acute coronary syndrome and had been provided ticagrelor as the second antiplatelet agent were included as study participants. The primary outcome of the study was the composite outcome of death, recurrent myocardial infarctions, re-intervention, and major bleeding.

We studied 321 patients (54 female patients, 16.82%). The mean age of the patients was 56.65 ± 11.01 years. Ticagrelor was stopped in 76.7% on follow-up. It was stopped in 6.3%, 13.5%, 13.1%, 21.9%, and 45.1% of patients during the first month but after discharge, between first and third months, between 3 and 6 months, between 6 and 12 months, and after 12 months, respectively. In the majority of patients, ticagrelor was replaced by clopidogrel (97.9%). It was stopped according to the physician’s discretion in 79.3% of patients, whereas it was the cost of the drug that made the patient to get swapped to another agent in 18.6%. No difference in the primary composite outcome was observed between the groups where ticagrelor was continued post 12 months and ticagrelor was continued and ticagrelor was switched-over to another agent. Similarly, no difference in death, recurrent myocardial infarctions, re-interventions, or major bleeding manifestations was observed between the two groups.

Conclusion

In patients with acute coronary syndrome who undergo PCI, we observed that early discontinuation of ticagrelor and switching over to other P2Y12 inhibitors after discharge did not affect clinical outcomes.

A whole system approach to improving mortality associated with acute kidney injury

BACKGROUND

Acute kidney injury (AKI) is in the main managed by non-nephrologists, many who feel challenged by or lack awareness of the complexity that the renal element adds to their patients' care. National reports have raised major concerns about the quality of care and have predicted that mortality reductions of 30% are achievable with good medical practice.

AIM

This quality improvement project evaluated whether a whole system approach could improve outcomes for patients with AKI.

DESIGN AND METHODS

Quality improvement methodology was used to understand hospital patterns, processes and professional knowledge. Change concepts were developed which included management of patients at risk, staff education and awareness program, development of a patient specific electronic alert to prompt diagnosis, easy to remember care bundle (ABCDE-IT), dedicated outreach team and patient and family empowerment leaflet.

RESULTS

Statistical process control analysis was used to verify outcomes over time. A shift in the in-hospital mortality rate corresponded to a relative 23.2% reduction in mortality and was sustained over the next 33 months (P < 0.0001). The favourable shift in mortality was temporally distinct from the improved AKI detection rate. This timeframe corresponded to lying below the 99.8% lower confidence limit in comparison with all English acute trusts for comparative AKI specific SHMI/HSMR mortality rates. Length of stay also reduced shortly after onset of the project by 14.1% or 2.6 day reduction (P < 0.0001).

CONCLUSION

This project demonstrated that an integrated, whole-system approach is necessary to ensure sustained improvements in AKI mortality and length of stay.

Inequalities in outcomes of acute kidney injury in England

BACKGROUND

Renal replacement is managed by renal specialists and is well documented in national registries. In contrast, nation-wide data on acute kidney injury (AKI) are difficult to capture as it presents in many different ways to all acute hospitals. This paucity impacts on the coordination of appropriate services.

AIMS

We have set out to use all the information submitted by all hospitals in England to identify emergency patients in whom AKI was a major contributor to their hospital stay. We then examined workload in relation to specialist provision and outcomes of care.

DESIGN AND METHODS

All English hospitals submit a sequential list of International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD 10) codes to describe the diagnosis of each admission. An algorithm was applied to all emergency admissions over a 2-year period to identify AKI. The level of renal specialist care available within each hospital trust was compared with patient outcomes, including 30-day mortality.

RESULTS

The incidence of AKI was 1.34% of all emergency admissions. The numbers and types of AKI cases were similar in all trusts, regardless of the service available. Thirty-day mortality was 30.0%. More than half the acute hospitals did not have on-site renal specialists and their AKI mortality rates were significantly higher (P < 0.001). These differences persisted despite adjusting for multiple variables.

CONCLUSION

The country has created specialist renal units in 45% of hospital trusts, but AKI presents as emergencies to all hospitals and there is an increased risk of mortality in the 55% of trusts without renal specialists.

'Microalbuminuric anaemia'--the relationship between haemoglobin levels and albuminuria in diabetes

BACKGROUND

There is an increasing incidence of anaemia in diabetes despite the absence of significant renal impairment.

AIMS

This study set out to determine the prevalence of anaemia in a diabetic population and to explore the relationship between anaemia and urinary albumin excretion in diabetes mellitus. Also, to determine the difference between those with overt nephropathy, microalbuminuria and those without evidence of renal disease.

METHODS

Five hundred and two consecutive diabetes patients were screened for anaemia. Anaemia was defined by World Health Organization criteria (<13 g/dl for men and <12 g/dl for women). Urinary albumin excretion was determined by urinary albumin creatinine ratio (ACR) from a single urine sample.

RESULTS

Anaemia was present in 118 (23.5%) patients. There was a rise in the prevalence of anaemia from 19% in patients with a normal ACR to 29% in those with microalbuminuria and to 41% in macroalbuminuria. This increase in the prevalence of anaemia in microalbuminuria compared to normoalbuminuria was not explained by declining renal function as there was no significant difference in eGFR between the two groups.

CONCLUSION

Anaemia was common in the study population. Early detection and correction of anaemia in diabetes is important for patients at risk of impaired quality of life and increased cardiovascular risk.

Familial cardiac myxoma: Carney's complex

We report a case of Carney's complex in a 12-year-old boy who had the characteristic features of multiple cutaneous tumors, pigmentation, and biatrial myxoma. His large right atrial myxoma almost occluded the tricuspid valve and presented a life-threatening emergency. Surgery saved his life, but recurrence of myxoma was noted on follow-up. The familial nature of the condition is highlighted by the case of the patient's 44-year-old mother, who also presented with features of Carney's complex: multiple cutaneous tumors and a tiny, asymptomatic, left atrial myxoma, which was detected during routine echocardiographic screening.

Left ventricular pseudoaneurysm caused by coronary spasm, myocardial infarction, and myocardial rupture

We report a very rare case of a 47-year-old man who had coronary spasm that resulted in a silent myocardial infarction, a ruptured myocardial wall, and a nonruptured left ventricular pseudoaneurysm. The patient presented with a 6-month history of dyspnea on exertion, without evidence of fixed coronary artery stenosis. Coronary angiography showed severe coronary spasm of the left anterior descending and left circumflex arteries; the spasm was relieved promptly by nitroglycerin. Echocardiography and left ventricular angiography revealed the large left ventricular pseudoaneurysm posterolateral to the left ventricle. We performed surgical resection of the pseudoaneurysm and patch repair of the ruptured left ventricular wall, with excellent results. We present this case because of the highly unusual sequence of events. Early surgical intervention resulted in the patient's recovery.

Vancomycin-resistant peritonitis associated with peritoneal dialysis: a cause for concern

BACKGROUND

Peritonitis resulting from peritoneal dialysis (PD) remains a serious cause of morbidity and even mortality among dialysis patients.

AIM

To highlight the danger of antibiotic resistance in patients on dialysis who have received multiple courses of antibiotics.

METHODS

Two cases are reported in which the patients developed peritonitis resistant to vancomycin.

CONCLUSIONS

Multi-drug resistance is a growing danger. It is imperative to use the most appropriate antibiotics in the proper dosage. If infections persist, early removal of the catheters is essential. The use of antibiotics in PD patients needs to be limited. Sensitivity patterns of the cultured organisms must be monitored regularly as the lack of vigilance may help accelerate the development of the so-called 'super bug' resistant to all antibiotics.

Influence of ribose on adenine salvage after intense muscle contractions

The influence of ribose supplementation on skeletal muscle adenine salvage rates during recovery from intense contractions and subsequent muscle performance was evaluated using an adult rat perfused hindquarter preparation. Three minutes of tetanic contractions (60 tetani/min) decreased ATP content in the calf muscles by approximately 50% and produced an equimolar increase in IMP. Effective recovery of muscle ATP 1 h after contractions was due to reamination of IMP via the purine nucleotide cycle and was complete in the red gastrocnemius but incomplete in the white gastrocnemius muscle section. Adenine salvage rates in recovering muscle averaged 45 +/- 4, 49 +/- 5, and 30 +/- 3 nmol. h(-1). g(-1) for plantaris, red gastrocnemius, and white gastrocnemius muscle, respectively, which were not different from values in corresponding nonstimulated muscle sections. Adenine salvage rates increased five- to sevenfold by perfusion with approximately 4 mM ribose (212 +/- 17, 192 +/- 9, and 215 +/- 14 nmol. h(-1). g(-1) in resting muscle sections, respectively). These high rates were sustained in recovering muscle, except for a small (approximately 20%) but significant (P < 0.001) decrease in the white gastrocnemius muscle. Ribose supplementation did not affect subsequent muscle force production after 60 min of recovery. These data indicate that adenine salvage rates were essentially unaltered during recovery from intense contractions.

The HELLP syndrome, a prospective study

OBJECTIVE

We undertook this study to evaluate the incidence and outcome of HELLP in Irish patients. In addition, duration and trends of the abnormal laboratory results were studied.

STUDY DESIGN

This prospective observational study screened 12068 pregnant women between January 1995 and March 1997. Any pregnant woman with hypertension, proteinuria, thrombocytopenia or anemia was monitored for hemolysis and elevated liver transaminases, from the time of recruitment till six weeks postpartum or resolution.

RESULTS

Thirteen of 12068 pregnant women (0.11%) developed HELLP. All had hypertension and 84.6% had proteinuria. Delivery was the only factor found to terminate the syndrome. Acute renal dysfunction was noted in 53.8% but none required dialysis. Laboratory parameters stabilized by the sixth postpartum day. Fetal mortality was 1 out of 14. There were no maternal deaths.

CONCLUSIONS

HELLP syndrome is a rare but potentially serious complication of pregnancy. Correlation with laboratory data and early intervention are vital in achieving a favorable outcome for both mother and fetus.

Successful transplantation of kidneys from a donor with HELLP syndrome-related death

We report on the successful use of kidneys procured from a donor with HELLP syndrome. The use of organs from a donor with HELLP syndrome has not been reported previously, perhaps because of the renal complications associated with it. Both recipients have been doing well since renal transplantation, with immediate graft function and acceptable graft function at 2 years of follow-up. In view of the continuing shortage of cadaveric kidneys for transplantation, this report highlights how organs from "marginal" donors should not be discarded without worthy consideration.

Hemolytic-uremic syndrome in association with both cyclosporine and tacrolimus

Hemolytic-uremic syndrome (HUS) is a well-recognized complication of cyclosporine (CyA) therapy. Transplant recipients with this complication are frequently switched to tacrolimus, although this drug has also been implicated. We report a case of a renal transplant recipient who developed severe graft dysfunction due to biopsy-proven HUS after receiving CyA. Renal function and hemolytic parameters improved with discontinuation of the drug, but they deteriorated again after commencement of tacrolimus 15 days later. A second transplant biopsy demonstrated fresh lesions diagnostic of HUS. Hemolytic parameters resolved with discontinuation of tacrolimus. This is the first report of metachronous HUS being caused in a renal transplant by both CyA and tacrolimus. We therefore believe that caution should be exercised when using tacrolimus as rescue therapy in patients with CyA-induced HUS.

A novel presentation of cryptococcal infection in a renal allograft recipient

The population of immunosuppressed patients is growing rapidly because of the HIV epidemic and the rapid expansion in transplant medicine. These patients may present to a variety of clinical specialties with seemingly innocuous infections. We present here the first Irish case of primary cryptococcal cellulitis. The patient was a 62-year old renal transplant recipient and was immunosuppressed with Cyclosporine, Azathioprine and Prednisolone. He presented with an apparent bacterial cellulitis on the dorsum of the hand that had failed to respond to a 3-week course of oral antibiotics. There was no clinical evidence of systemic infection. There was tissue necrosis present and the area was debrided surgically. Histological examination of debrided tissue revealed necrotic granulomata and budding yeast-like organisms. Cryptococcus neoformans was cultured from this specimen. The patient was treated with oral fluconazole 400 mg daily for 6 weeks with complete healing of the infected area and no evidence of recurrence after 12 months of follow up. This case emphasises the need for a high index of suspicion for atypical infection in the immunocompromised patient.

Aortic valve disease and left dominant coronary system a significant association

OBJECTIVES

To study the dominance of coronary artery distribution in patients with aortic valve disease.

MATERIAL AND METHODS

The prevalence of left dominant coronary artery system in patients with aortic valve disease was compared with patients without aortic valve disease undergoing coronary angiography. Group 1 consisted of 237 patients with symptomatic aortic valve disease and Group 2 consisted of 241 consecutive patients without aortic valve disease undergoing cardiac catheterisation.

RESULTS

Forty two patients in Group 1 and 20 patients in Group 2 (p < 0.01) showed a left dominant pattern of supply. Fifteen patients in Group 1 and eight patients in Group 2 showed a co-dominant pattern of supply (p = NS). Among patients in Group 1, there was no significant difference in the increased prevalence of left dominant system between patients with congenital or acquired aortic valve disease or between the different categories of aortic valve lesions.

CONCLUSION

Patients with aortic valve disease show a statistically significant higher prevalence of left dominant pattern of blood supply. This higher prevalence of left dominance is seen in all categories of aortic valve lesions, namely, predominant aortic stenosis, predominant aortic regurgitation and in combined aortic stenotic and regurgitant lesions.

Pregnancy in Irish renal transplant recipients in the cyclosporine era

BACKGROUND

The effect of renal transplantation on pregnancy in Irish women not receiving CyA has been reported previously.

AIM

To examine all pregnancies occurring in Irish female renal transplant recipients since the introduction of CyA.

METHODS

Using a community based approach, we identified 29 pregnancies in 19 women, aged between 16 and 45, mean age 30.3 years.

RESULTS

These pregnancies ended in four miscarriages (13%), two intra-uterine deaths (6.9%) and 23 live births (79.3%). Of these live births, 73.9% were premature (< or = 36 weeks) and 65.2% were of low birth weight (< 2500 g). Admission to the neonatal intensive care was necessary in 61%, and two babies (8.7%) died in the neonatal period. Mean gestational age was 34 weeks, and mean birth weight was 2190 g. There was no change in graft function during pregnancy, with a small rise in serum creatinine post-partum (+9.64 mumol/L). The renal graft failed in three women (15.8%) by the end of the follow-up period. Compared with the precyclosporine era, the live birth rate was higher (79.3% versus 58%) with a trend towards lower birth weight and shorter gestation.

CONCLUSION

Renal transplantation with CyA use is not a contraindication to pregnancy, but it is associated with increased risk, especially when the serum creatinine is > 175 mumol/L.

Percutaneous transvenous mitral commissurotomy for significant calcific mitral stenosis: utility of the stepwise balloon dilatation technique and follow-up results

The present study examined the utility of the stepwise balloon dilatation technique in 41 patients with significant calcific mitral stenosis undergoing percutaneous transvenous mitral commissurotomy (PTMC). Thirty-five patients (85.4%) had a successful procedure; one patient developed cardiac tamponade and underwent mitral valve replacement. The mitral valve area increased from 0.9 +/- 0.2 cm2 to 1.7 +/- 0.3 cm2 following PTMC. Increase in mitral regurgitation (MR) was seen in 11 patients (26.8%). All patients showed improvement in functional class of > or =1 level following PTMC, which was sustained in 34 patients at follow-up. At a mean follow-up period of 20 +/- 12 months (range 3-51 months) in 35 patients, 26 patients (74.3%) were in New York Heart Association (NYHA) functional Class I, 8 patients (22.9%) were in NYHA Class II, and 1 patient (2.8%) was in NYHA Class III. The cumulative 4-year cardiac event-free survival rate was 81.8%. However, patients with grade 4+ calcification had only 50% event-free survival rate. At follow-up, an increased incidence of cardiac events was seen in female patients as compared with male patients (83.3% versus 16.7%). Restenosis was seen in 3 patients (8.6%). One patient underwent repeat PTMC 37 months after the initial procedure. There was no incidence of death or mitral valve replacement at follow-up. We conclude that the stepwise balloon dilatation technique can be safely and effectively applied for patients with significant calcific mitral stenosis to achieve an optimal mitral valve area with low incidence of significant increase in MR. Favorable long-term benefits also accrue in the form of improved functional status and low incidence of repeat procedures (repeat PTMC or mitral valve replacement). The majority of patients (74.3%) were in NYHA functional class I without medication. Patients with grade 4+ calcification show less benefit from PTMC and may be considered for mitral valve replacement. Cardiac events occur more frequently in female patients than in male patients during follow-up.

Angioplasty and stenting of solitary supra-aortic artery and aortoplasty by kissing balloon technique

A child presented with symptoms of compromise to cerebral blood flow and cardiac failure. On diagnostic angiography, he was found to have a discrete coarctation and related ostial stenosis of the left subclavian artery, which acted as the sole source of cerebral blood flow. The subclavian lesion was initially dilated with a 6 mm x 50 mm balloon. The discrete coarctation was then dilated with an 8 mm x 50 mm balloon. Since significant residual stenosis was present at the subclavian origin, it was stented with a 20 mm Palmaz-Schatz stent (Cordis Corporation, Miami Lakes, Florida). Since the coarcted segment required further dilatations, the kissing balloon technique was used, wherein the 6 mm balloon was placed extending from the left subclavian lesion distally to the related aortic lesion proximally, along with another 10 mm balloon in the aorta. The end result was acceptable and the patient's symptoms improved significantly after the procedure.

Tetralogy of Fallot in adults--107 cases

Clinical and haemodynamic profile of 107 adult patients above the age of 15 years with TOF was analysed. Cardiac catherization and selective cine-angiography were performed in all cases. Infundibular pulmonary stenosis, mal-alignment type of ventricular septal defect, mitral-aortic fibrous continuity and equal systolic pressures in both the ventricles and aorta were considered mandatory for the diagnosis of Tetralogy of Fallot. Aortic regurgitation was seen in 26 cases (24%), tricuspid regurgitation in 22 cases (21%), absent pulmonary valve in 3 cases (3%), branch pulmonary artery stenosis in 9 case (8.4%), major aortopulmonary collaterals in 15 cases (14%), right atrial pressure was more than 10 mmHg in 10 cases (11%) and right ventricular end diastolic pressure more than 9 mmHg in 73 cases (68%). The left ventricular end diastolic pressure was above 13 mmHg in 58 cases (54%).

End-systolic volume and long-term survival after coronary artery bypass graft surgery in patients with impaired left ventricular function

BACKGROUND

Left ventricular function is the main predictor of long-term survival in patients with coronary artery disease. In patients with impaired left ventricular function after myocardial infarction, end-systolic volume is a better predictor than the global ejection fraction. We analyzed long-term follow-up of patients with impaired left ventricular function undergoing coronary artery bypass graft surgery to evaluate preoperative predictors of survival.

METHODS AND RESULTS

Consecutive patients with ejection fractions < or = 40% (n = 193) who had undergone surgical revascularization were followed to assess the predictive value of preoperative baseline characteristics and catheterization findings for long-term survival. Patients were followed for 133 +/- 30.7 months. At the time of surgery, patient age was 56 +/- 7.9 years and 169 patients (87.6%) had a history of previous myocardial infarction. Thirty-one patients (16%) were female. The ejection fraction was 32 +/- 7%, and the end-systolic volume was 147.4 +/- 52.6 mL. One hundred sixty-four patients (84.9%) had three-vessel disease, and 44 (22.8%) had a left main stenosis with > 50% diameter loss. Follow-up was complete in 99%. Fourteen patients died (7.3%) within the first 30 days after surgery. Twelve-month actuarial survival was 86%, 4-year survival was 80%, and 10-year survival was 40%. Predictors of poor long-term survival on multivariate analysis were end-systolic volume index (chi 2 = 14.02, P = .002), number of previous myocardial infarctions (chi 2 = 6.47, P = .001), preoperative stenosis score (chi 2 = 4.97, P = .02), and age at the time of surgery (chi 2 = 4.45, P = .03).

CONCLUSIONS

End-systolic volume index is the major predictor of survival after coronary artery bypass graft surgery in patients with impaired left ventricular function. Strategies to prevent ventricular dilatation, such as angiotensin-converting enzyme inhibitors, may improve the long-term outcome in these patients.

Lipoma of hypopharynx

The histologically benign hypopharyngeal lipoma is a potentially fatal tumour because of the risk of upper airway obstruction. It may be asymptomatic or present with symptoms ranging from vague foreign-body sensation to sore throat, dysphagia or dysphonia. The diagnosis may be suggested by indirect or fibreoptic laryngoscopy. Lateral neck soft tissue X-ray and barium swallow may help but CT imaging of the pharynx enables a more precise preoperative diagnosis. Treatment is by surgical excision of the lesion either perorally, endoscopically or via a lateral pharyngotomy. Long-term follow-up is recommended due to the possibility of recurrence and metachronous lesions.

The prevalence and outcome of ventricular arrhythmias in acute myocardial infarction

One hundred and seventy-two consecutive cases of acute myocardial infarction (MI) admitted to a coronary care unit were studied with regard to ventricular arrhythmias--pre-mature ventricular contractions (PVC), ventricular tachycardia (VT) and ventricular fibrillation (VF). Sixty-seven (39%) patients had ventricular arrhythmias (PCC-VT-VF), of whom 17 (9.8%) had VT and 11 (6.4%) VF. VT and VF, but not total arrhythmias, were more common in anterior infarctions. Fifty-six out of 67 (83.5%) of these patients arrived at Accident & Emergency (A&E) within the first six hours of onset of chest pain. Ten out of 11 (91%) patients who had VF did so in the first six hours. PVCs were poor predictors of the occurrence of VF (positive predictive value 5.9%). Forty-three patients (84%) who had PVCs did not develop any further arrhythmias. Spontaneous heart rate had no influence on the occurrence of ventricular arrhythmias. Frequent PVCs were more commonly associated with progression to VT and VF. In 30 cases (88%) lignocaine was effective. There was no death due to VT/VF and all responded to drugs and/or cardioversion.

Ventricular septal defect with aortic regurgitation: a hemodynamic and angiographic profile in Indian subjects

The records of 362 patients of Ventricular Septal Defect (VSD) were analysed to find out the incidence of aortic regurgitation (AR) and their hemodynamic and angiographic features. Thirty-seven patients (10.2%) were found to have AR, whose mean age was 13.4 years (range: 2-45) and male to female ratio was 5:1. Of the 37 cases 31 (84%) had infracristal and 6 (16%) had supracristal VSD. In 31 patients with infracristal VSD the prolapsing cusp was Right Coronary Cusp (RCC) in 14 (48%), Noncoronary Cusp (NCC) in 12 (41%) and both RCC and NCC in 3 (11%). Of the 6 patients with supracristal VSD the prolapsing cusp was RCC in 5 (83%) and NCC in 1 (17%). In two patients the AR was due to bicuspid aortic valve. The pulmonary artery pressure was normal in 26 of 37 (70.2%) patients and the left to right shunt was 1.5:1 or less in 23 of 37 (62%) patients. Nineteen of the 37 patients (51.3%) had grade I or II AR and the remaining 18 (48.7%) had grade III or IV AR. There was no relationship between the severity of AR and the location of the VSD. In conclusion, in this series, the incidence of VSD+AR is relatively higher and that of supracristal VSD is lower. In majority of patients the left to right shunt is small and pulmonary artery pressure within normal limits. The prolapse of RCC is more common in supracristal VSD and there is no relation between the severity of AR and the location of the VSD.

Myocardial bridge (MB): an angiographic curiosity?

The coronary angiograms of 1,500 cases performed between 1981 and 1989 were analysed to find out the incidence of Myocardial Bridge (MB) and its significance as regards myocardial ischemia. Sixteen of these (1.06%) were found to have MB. Their ages ranged from 27-70 years (m = 49.2) and male:female ratio was 13:3. Out of 16 patients, 7 (group A) had associated coronary artery disease (CAD) (7 of 1421; 0.49%) and remaining 9 (group B) had no associated CAD (9 of 79; 11.39%). All the MB were found on left anterior descending artery (LAD) (3 on proximal LAD and 13 on mid LAD). No MB was found on right coronary artery (RCA) or circumflex arteries. The location of the MB did not affect the pattern of CAD. Chronic stable angina was the commonest presenting symptom in group A patients (5 out of 7) and atypical angina in group B patients (5 out of 9). Majority of group B patients had either normal or nonspecific ST-T changes in ECG (7 out of 9). However, the presence of previous myocardial infarction or ECG evidence of 'Q' wave infarction (2 out of 2) was always associated with significant CAD. Similarly, regional wall motion abnormalities on echocardiogram were always found in patients with significant CAD and old myocardial infarction. All 9 patients with MB and normal coronary arteries were managed conservatively with good relief of symptoms, whereas other seven patients were managed on the merits of the underlying CAD. In conclusion, the MB is a normal variant found incidentally on coronary angiography, and does not have any definite clinical correlations or pathological significance.

Tetralogy of Fallot with hypertrophic cardiomyopathy--an unknown combination

A hitherto unknown association of Tetralogy of Fallot (TF) and Hypertrophic Cardiomyopathy (HCM) diagnosed by two dimensional echocardiography, cardiac catheterization and angiocardiography is reported. Patient underwent emergency aortopulmonary shunt successfully. The literature is reviewed in brief.

Mean frontal QRS axis and pulmonary artery pressures in rheumatic mitral stenosis

The relationship between the mean frontal QRS axis calculated from the scalar 12 lead ECG, and the pulmonary artery (PA) pressures obtained by cardiac catheterisation in 64 cases of isolated rheumatic mitral stenosis (MS), was analysed. An overall trend of rightward axis shift with increasing PA pressures was observed; the best correlation was seen with systolic PA pressures (r = 0.51). It was possible to recognise 3 categories of patients: (1) With an axis of 70 degrees and below, systolic PA pressures were below 70 mm Hg in 82.4% of cases and below 80 mm Hg in 94% of cases; diastolic pressures were below 40 mm Hg in 88.2%; mean PA pressures were below 50 mm Hg in 88.2% cases. (2) With an axis of 71 degrees to 100 degrees, systolic PA pressures ranged from 30 to 120 mm Hg, diastolic PA pressures from 12 to 60 mm Hg and mean PA pressures from 19 to 80 mm Hg. (3) With an axis of above 100 degrees, systolic PA pressures were over 70 mm Hg in 95.5% of cases, diastolic PA pressures more than 30 mm Hg in 90.9%, and mean PA pressures more than 45 mm Hg in 90.9% cases. It was therefore possible to predict, with reasonable accuracy, the range of PA pressures in patients with isolated MS, except in those cases with an axis between 71 and 100 degrees.

Severe syphilitic aortic regurgitation with bilateral critical coronary ostial stenosis

A forty-year-old male with syphilitic severe aortic regurgitation and critical bilateral coronary ostial stenosis, proved by cardiac catheterization and angiocardiography, is presented. He underwent successful aortic valve replacement and coronary artery bypass grafting with gratifying results.

Subaortic stenosis associated with anomalous right ventricular muscle bundle and ventricular septal defect

A rare case of biventricular outflow tract obstruction in the form of discrete subaortic membrane and hypertrophic anomalous right ventricular muscle bundle associated with ventricular septal defect is presented.

Detection of silent myocardial ischemia by Holter monitoring and its relation to severity of coronary artery disease

Thirty-five patients of chronic stable angina, unstable angina and post MI angina, who were on medical treatment, underwent 24 hours Holter monitoring and coronary angiography to find out the incidence of Silent Myocardial Ischemia (SMI) and its relation to anatomic severity of coronary artery disease. Total duration of Holter monitoring was 835.32 hours (average 23.40 hours per patient) with 48 ischemic episodes out of which 16 were painful and 32 painless. Total duration of painful episodes was 189 minutes and that of painless episodes was 428 minutes (70% was constituted by SMI). Out of 35 patients, 6 (17.14%) had SMI; 2 of 17 (11.7%) of chronic stable angina, 2 of 8 (25%) of unstable angina, and 2 of 10 (20%) of post-infarction angina patients. On analysis of coronary angiogram, all 6 (100%) patients with SMI, and only 22 out of 29 (76%) without SMI, had severe multiple coronary artery disease. Thus, although the overall incidence of SMI in this series is low, its presence invariably indicates a severe degree of coronary artery disease.

Results of 130 consecutive percutaneous transluminal coronary angioplasty (PTCA) procedures in single and multiple vessel coronary artery disease (CAD)

Over the last 1-year period, we performed 130 consecutive percutaneous transluminal coronary angioplasty (PTCA) procedures in 108 patients, 103 of them were males and 5 females. Their mean age was 50.9 +/- 6.83 years (range 33-70). All of them were symptomatic, manifested by acute infarction in 18 (17%), chronic stable angina in 30 (28%), unstable angina in 5 (5%) and post-myocardial infarction angina in 55 (51%) cases. Among these patients, single-vessel CAD was present in 42 (39%), double-vessel in 37 (34%) and triple-vessel CAD in 11 (10%) patients. Nine patients (8.3%) had total occlusion, and 18 (16.6%) had tandem or bifurcation lesions of target artery. Of the 112 PTCA procedures (excluding those in acute infarction), 53 (47%) were performed on LAD, 29 (26%) on RCA, and 30 (27%) on circumflex artery, with success rates of 86.7%, 83.3% and 82.7% respectively. The overall success rate was 85% (95 of 112). The PTCA was successful in 36 of 42 (85.7%), 32 of 37 (86.5%) and 9 on 11 (82%) patients with single, double and triple-vessel CAD respectively. The mean diameter stenosis reduced from 67.1 +/- 16.54% to 19.9% +/- 10.9%. PTCA was unsuccessful in 17 (15%) due to failure to cross the lesion in 11 (9.7%), failure to dilate in 1 (0.9%) and abrupt reclosure of dilated segment in 5 (4.4%). Four (3.5%) patients underwent CABG. Two patients had redo PTCA owing to restenosis at about 6 months of first PTCA.(ABSTRACT TRUNCATED AT 250 WORDS)

Intralobar sequestration of upper lobe of right lung--case reports

Two cases of intralobar sequestration of the right upper lobe, which is supplied by a major anomalous collateral artery from the descending thoracic aorta and also by the upper lobe branch of the right pulmonary artery, are presented. Both cases underwent surgical correction. The plexus of abnormal vessels in the right upper lobe of the lung communicating to the anomalous collateral artery was unexpected. The return pathway into the right pulmonary artery was most unusual. The embryologic explanation of the anomaly and the surgical implications are discussed. The return pathway of the left-to-right shunt by a branch of the pulmonary artery is most unusual and has hitherto not been reported in English literature to the best of the authors' knowledge.

Subvalvular aneurysm. Two-dimensional echocardiographic features

A rare case of subvalvular aneurysm diagnosed by two-dimensional echocardiography and confirmed at cardiac catheterization is presented.