Drug-Eluting Balloon for Management of Coronary In-Stent Restenosis in a South Asian Population: Experience From a Tertiary-Care Hospital in Pakistan.

BACKGROUND: Emerging evidence suggests that the South Asian (SA) population has an increased rate of in-stent stenosis (ISR) after percutaneous coronary intervention (PCI) when compared with other ethnicities. Drug-eluting balloons (DEBs) have emerged as a viable option for the treatment of ISR. However, data describing the outcomes of DEB-PCI in the SA population are limited. Since the magnitude of the problem is high in the SA population, it is essential to evaluate the outcomes of DEB-PCI for ISR. METHODS: In this cohort study, we investigated the incidence of target-lesion revascularization (TLR) and major adverse cardiac event (MACE) after PCI with DEB for ISR at 1 year and at long-term follow-up in Pakistani patients. From January 2010 to January 2019, a total of 147 ISR lesions in 112 patients were treated with DEB-PCI at our center. RESULTS: The incidence of clinically driven TLR and MACE after a 1-year follow-up was 15.2% and 16.1%, respectively. At mean long-term follow-up of 2.73 ± 2.14 years, the TLR and MACE rates were 26.8% and 35.7%, respectively. The major predictors for TLR were diffuse and occlusive ISR types, DEB for a recurrent restenosis lesion, and the presence of ≥3 traditional cardiovascular disease risk factors. CONCLUSIONS: The high rates of follow-up TLR and MACE reported in this study may suggest that the outcomes of DEB-PCI for ISR in the SA population may be unsatisfactory. With the increasing use of DEBs, it is imperative to further investigate DEB-PCI outcomes in the SA population with large, prospective studies.

Prognostic Significance of CMR Findings in Patients with Known Coronary Artery Disease - Experience from a South Asian Country.

OBJECTIVES: South Asians (SA) have a higher burden of coronary artery disease (CAD) and are known to have a worse prognosis compared to other ethnicities. Therefore, it is imperative to improve the risk stratification of SA patient with CAD and to seek out newer prognostic markers beyond the conventional echocardiography.The aim of this study was to investigate whether variables obtained by cardiac magnetic resonance (CMR) improve risk stratification of South Asian patients with known CAD. MATERIAL AND METHODS: We retrospectively analyzed 147 patients with evidence of CAD that had a CMR at our center between January 2011 and January 2019. LV volumes and regional wall motions were acquired by cine images, while infarct size (IS) was measured by late gadolinium enhancement. At a mean follow-up of 3.36 ± 2.22 years, cardiac events (non-fatal myocardial infarction, hospitalization due to heart failure, life-threatening arrhythmia, or cardiac death) occurred in 49 patients. An IS ≥35%, left ventricular ejection fraction (LVEF) ≤31%, and a wall motion score index (WMSI) ≥1.9 were strongly associated with follow-up cardiac events (P < 0.001). Patients that had none or less than 3 of these factors, showed a lower risk of cardiac events (HR 0.22 CI [0.11-0.44] P < 0.001 and HR 0.12 CI [0.04-0.32] P < 0.001, respectively) compared to those with all three factors. CONCLUSION: Integration of CMR derived factors such as IS and WMSI with LVEF can improve the prognostication of the SA population with CAD. Better risk stratification of patients can lead to improved and cost-effective therapeutic strategies to ameliorate the prognosis of these patients.

Cardiac Magnetic Resonance Evaluation of Cardiac Masses in Patients with Suspicion of Cardiac Masses on Echo or Computed Tomography.

OBJECTIVES: In recent years, cardiac magnetic resonance (CMR) imaging has emerged as an important tool in the identification and characterization of cardiac masses. No imaging data on cardiac masses are available from Pakistan. We aimed to review the clinical presentation, CMR findings, and outcome of patients referred for CMR due to suspicion of cardiac masses on echocardiogram or computed tomography (CT). MATERIAL AND METHODS: We reviewed all the patients referred for CMR at Aga Khan University Hospital, Karachi, from January 2011 to March 2020, with the suspicion of cardiac mass on echocardiogram and/or CT. Only those with the confirmed diagnosis of cardiac mass on CMR were included in the study. RESULTS: A total of 27 patients were referred for CMR from January 2011 to March 2020, with the suspicion of cardiac mass on echocardiogram and/or CT. Four patients were excluded as no cardiac mass was found on CMR. Out of 23 cases, majority (n = 15, 65%) were female, age ranging from 3 months to 70 years, with a mean age of 40 ± 22 years. Shortness of breath was the main presenting symptom (n = 19, 83%). Echocardiogram was the initial imaging modality done in all the patients while CT was also performed in 6 patients (26%). Out of 23 patients, 4 (17%) were diagnosed to have thrombus on CMR. In two cases, it was in the left ventricle with evidence of myocardial infarction on late gadolinium images. Myxoma was the most common tumor diagnosed on CMR in 6 patients (26%) followed by rhabdomyoma (n = 3, 13%) and fibroma (n = 2, 8.7%). There were three malignant primary tumors of the heart based on CMR appearances and one with tumor thrombus extension of hepatocellular carcinoma in the right atrium from inferior vena cava. Two patients were diagnosed to have non-neoplastic lesions - one with large intracardiac hydatid cyst and one with possible large fungal vegetation. Among 23 patients, 9 patients (39%) underwent surgery, 5 with myxoma, 2 with rhabdomyoma, 1 with fibroma, and 1 with fibroelastoma. Findings on surgery and histopathology matched the CMR diagnosis in all the patients except the one with the CMR diagnosis of myxoma in which histopathology was consistent with thrombus. CONCLUSION: CMR can play an important role in confirming the presence or absence of a mass in the heart. It can also provide differentiation of non-neoplastic and neoplastic lesions and among different types of neoplastic lesions with reasonable accuracy. However, the limitations of CMR must be recognized.

On the Effects of Process Parameters and Optimization of Interlaminate Bond Strength in 3D Printed ABS/CF-PLA Composite.

The scope of additive manufacturing, particularly fused deposition modelling (FDM), can indeed be explored with the fabrication of multi-material composite laminates using this technology. Laminar composite structures made up of two distinct materials, namely acrylonitrile butadiene styrene (ABS) and carbon fiber reinforced polylactic acid (CF-PLA), were produced using the FDM process. The current study analyzes the effect of various printing parameters on the interfacial bond strength (IFBS) of the ABS/CF-PLA laminar composite by employing response surface methodology. The physical examination of the tested specimens revealed two failure modes, where failure mode 1 possessed high IFBS owing to the phenomenon of material patch transfer. Contrarily, failure mode 2 yielded low IFBS, while no patch transfer was observed. The analysis of variance (ANOVA) revealed that printing parameters were highly interactive in nature. After extensive experimentation, it was revealed that good quality of IFBS is attributed to the medium range of printing speed, high infill density, and low layer height. At the same time, a maximum IFBS of 20.5 MPa was achieved. The study presented an empirical relation between printing parameters and IFBS that can help in forecasting IFBS at any given printing parameters. Finally, the optimized printing conditions were also determined with the aim to maximize IFBS.

Thoracoscopic evacuation of retained post-traumatic hemothorax.

Post-traumatic retained hemothorax is a major risk factor for empyema thoracis leading to prolonged hospitalization, entrapped lung and a need for decortication. VATS (Video Assisted Thoracoscopy) for retained hemothorax shortens the duration of chest tube drainage and length of stay. From December 2004 to July 2009, 110 consecutive patients underwent VATS for retained or clotted hemothoraces at the Department of Thoracic Surgery, Jinnah Postgraduate Medical Centre, Karachi. Majority of the patients were males (n = 91; 82.7%). Sixty-five patients (59.1%) underwent VATS within 6 days and 45 patients (40.9%) between 7 - 14 days of injury. In 8 patients (7.3%) VATS was abandoned for thoracotomy. Post VATS full lung expansion was achieved in 87 patients (79.0) with complete evacuation of hemothorax. Chest tubes were removed within the first week in 100 patients (90.9%). In hemodynamically stable patients, VATS is a safe, reliable and effective technique for the evacuation of retained hemothorax. Early intervention within 6 days of injury avoids the need for a thoracotomy and is associated with a better short and long-term outcome.

Experience of thymectomy by median sternotomy in patients with myasthenia gravis.

OBJECTIVE: To determine the outcome of thymectomy in patients with myasthenia gravis and safety of median sternotomy approach. METHODOLOGY: An observational descriptive study was conducted in the department of thoracic surgery JPMC from February 2005 to January 2009. Twenty-two patients having persistent generalized or ocular myasthenia gravis referred to our department by neurologists and general physicians, partially or not responding to medical treatment with or without thymoma, were included in the study. Those who were not fit for anaesthesia were excluded. Preoperatively 2 to 3 sessions of plasmapheresis were done and each patient was given anti myasthenia gravis treatment. Clinical staging was done by Modified Osserman classification. Median sternotomy approach was used. Outcome was assessed on the basis of remission of disease in different Osserman groups. All patients were followed for a minimum of 6 months. RESULTS: Out of 22 patients, 16 (72.7%) were females and 6 (27.2%) males. Mean age at presentation was 35.2 +/- 14.5 years. Mean duration of symptoms was 1.5 +/- 1.2 years. A total of 4 (18.1%) patients with myasthenia gravis had thymoma and histopathology of 18 (81.9%) patients showed thymic hyperplasia. Remission was seen in most grades of Osserman. The best response was seen in Grade I where all patients achieved remission. Most patients in Grade II A and II B were benefited. The only patient in Grade III had no improvement of symptoms. No patient in Grade IV underwent thymectomy. Overall 86.3% had a positive outcome on basis of remission and improvement. CONCLUSION: Thymectomy by median sternotomy is safe and effective with more favourable outcomes for patients of myasthenia gravis not responding to medical treatment.

Clinical profile and postoperative outcome in patients with simple and complex aspergilloma of lung.

OBJECTIVE: To compare the clinical presentation and results of pulmonary resection in simple and complex aspergilloma of the lung. STUDY DESIGN: Observational study. PLACE AND DURATION OF STUDY: The Department of Thoracic Surgery, Jinnah Postgraduate Medical Centre, Karachi, from January 2003 to December 2008. METHODOLOGY: Fifty-one adult patients with unilateral aspergilloma lung were included in this study. Patients were divided into two groups: A (simple aspergilloma-SA, n=14) and B (complex aspergilloma-CA, n=37), based on the radiological and operative characteristics of the cavitatory lesion and the presence or absence of extensive adhesions with the chest wall. Suitability for resection was assessed with arterial gases, pulmonary function tests and echocardiogram. Results were compared using Fishers exact test. RESULTS: Recurrent hemoptysis was the predominant symptom in both the groups. Exertional dyspnea (A=21.4%; B=56.8%; p=0.03), chest pain (A=21.4%; B=59.5%; p=0.027), cough (A=35.7%; B=70.3%; p < 0.05) and postoperative complications like residual pleural space A=14.2%; B=54%; p=0.013) and pleural collection (A=7.1%; B=37.8%; p=0.041) were predominant in group B. Lobectomy was the most common procedure performed in group B (A=28.6%; B=59.5%), while wedge excision was performed in the majority of patients in group A (A=42.9%; B=29.7%). Recurrence of aspergilloma was seen in 3 patients (8.1%) in group B only. Total number of early and late complications in SA and CA were 7, and 60, respectively. Early mortality was 8.1% and 0.0% in group B and group A, [corrected] respectively (p=0.552). The overall mortality was 5.4%. CONCLUSION: Symptoms were more frequently associated with CA as compared to SA. Surgery for CA was associated with low mortality but significant morbidity, whereas SA had low postoperative morbidity and no mortality.

Role of Urgent Thoracotomy in improving the survival of patients with severe chest trauma.

OBJECTIVE: To determine the frequency of survival in patients with thoracic trauma, undergoing Urgent Thoracotomy (UT). STUDY DESIGN: Quasi-experimental study. PLACE AND DURATION OF STUDY: The study was carried out in the Department of Thoracic Surgery, JPMC, Karachi, from January 2005 to June 2007 (30 months). METHODOLOGY: Fifty two patients, who presented with chest trauma and underwent UT within 48 hours of sustaining thoracic trauma, were included in the study. All patients were assessed by history, physical examination and relevant investigations. RESULTS: A total of 475 patients with acute thoracic trauma needing admission during the study period presented to the Accidents and Emergency Department. Fifty-two (52/475; 10.9%) patients were indicated for UT. The most common indication for UT was massive hemothorax (43/52; 82.6%). The mean age of the patients was 34.36 +/- 11.02 years. There were 22 (42.2%) blunt injuries and 30 (57.8%) penetrating injuries. Road Traffic Accidents (RTA) were the most frequent cause of blunt chest injuries (15 patients; 75%), while firearm injury was the commonest (21 patients; 70%) cause of penetrating chest trauma. Post thoracotomy mortality was 13.3 % (4 out of 30) in patients with penetrating injuries and 18.2% (4 out of 22) in patients with blunt injuries (p < 0.01). Mortality of UT was 15.3 % with survival of 84.7%. Overall survival in 475 patients was 95.58%. CONCLUSION: Early recognition of treatable injuries and an aggressive approach in management with Urgent Thoracotomy can increase chances of survival of patients suffering from severe chest trauma.

Morgagni's hernia.

Morgagni's hernia is an uncommon type of diaphragmatic hernia. These patients usually present in childhood but sometimes later in life. We report a case of 75 years old female who presented with epigastric discomfort and vomiting. She was diagnosed as a case of calculous cholecystitis and was treated with antibiotics but was not relieved. Further investigations revealed Morgagni's hernia. She was successfully managed by open surgical technique.