Transmission of methicillin-resistant Staphylococcus aureus infection through solid organ transplantation: confirmation via whole genome sequencing.

We describe two cases of donor-derived methicillin-resistant Staphylococcus aureus (MRSA) bacteremia that developed after transplantation of organs from a common donor who died from acute MRSA endocarditis. Both recipients developed recurrent MRSA infection despite appropriate antibiotic therapy, and required prolonged hospitalization and hospital readmission. Comparison of S. aureus whole genome sequence of DNA extracted from fixed donor tissue and recipients' isolates confirmed donor-derived transmission. Current guidelines emphasize the risk posed by donors with bacteremia from multidrug-resistant organisms. This investigation suggests that, particularly in the setting of donor endocarditis, even a standard course of prophylactic antibiotics may not be sufficient to prevent donor-derived infection.

The negative autopsy: sudden cardiac death or other?

One of the most frustrating challenges faced by the forensic pathologist is the inability to determine the cause of death in a young person previously thought healthy. The four steps in the investigation of a sudden death include obtaining the history and scene information, performing a gross and microscopic autopsy, performing appropriate laboratory tests, and making the diagnosis. When examining the heart grossly it is important to preserve the anatomic landmarks, section the coronary arteries closely, and recognize lethal abnormalities such as anomalous origin of the coronary arteries. Specimens useful for toxicologic analysis include whole blood, serum, vitreous humor, gastric contents, bile, urine a purple top tube of blood, and frozen myocardium and spleen. Lethal cardiac diseases with minimal or no anatomic findings include Brugada and Garg's syndromes, the long QT syndrome, and Wolff-Parkinson-White (WPW) syndrome. Consultation with other experts, including cardiac pathologists, cardiologists, electrophysiologists, and molecular biologists, may be helpful in determining a cause of death.

Unexpected death due to chloramine toxicity in a woman with a brain tumor.

It has been known for years that mixing household cleaning products can be hazardous. Nonetheless, from time to time, episodes of pneumonitis from such mixing occur. Although symptoms range from minor upper respiratory irritation to adult respiratory distress syndrome, deaths are very rare. We present the case of a woman with an undiagnosed oligodendroglioma who mixed bleach and ammonia (resulting in the formation of chloramine gas), and died while cleaning her bathroom. To our knowledge, this is the first such death reported from chloramine gas intoxication.

Gastric distension, cerebral palsy and unexpected death.

Two cases of unexpected death from massive gastric dilatation in individuals with severe spastic quadraparesis aged 14 and 20 years, respectively, are reported. Spontaneous rupture of the stomach occurred in one case. Predisposing factors to gastric dilatation associated with cerebral palsy include autonomic neuropathy, neuromuscular incoordination, air swallowing and malposition of the stomach. Death may be due to compromise of respiratory function caused by lung compression by the dilated stomach, or to peritonitis with sepsis. Acute gastric dilatation, with or without rupture, should be considered a potential cause of unexpected death in individuals with severe mental and physical disabilities.

Fatal hyperthermia secondary to sunbathing in a patient with multiple sclerosis.

A 27-year-old white woman with a history of multiple sclerosis was found dead lying on a lounger, clad in a bathing suit. She had been sunbathing for 4 hours. Significant autopsy findings consisted of numerous variably sized demyelinated plaques involving the periventricular cerebral white matter and cerebellum. Elevation of core temperature in patients with multiple sclerosis leading to transient or permanent adverse neurologic signs and symptoms has been documented for more than 60 years. This case illustrates that a modestly increased core body temperature, even from a usually innocuous activity such as sunbathing, may be fatal in patients with multiple sclerosis.

An unusual site for the AV node tumor: report of two cases.

Atrioventricular (AV) node tumors are very uncommon primary cardiac tumors located exclusively in the AV nodal region. The nomenclature has been diverse according to different histogenetic theories proposed since the first description in 1911. Histochemical, ultrastructural, and immunohistochemical studies have demonstrated its endodermal origin. Patients with these tumors can develop complete heart block or sudden death, but the tumor can also be an incidental finding at autopsy. We present two accidental deaths cases in which multiple foci of atrioventricular node tumor (Case 1) and an isolated cyst (Case 2) were observed in the atrial septum, sparing the conduction system.

Sudden death due to ventricular septal defect.

Ventricular septal defects (VSD) are usually considered non-life-threatening, usually closing spontaneously or causing symptoms of congestive heart failure, which can be surgically treated in time to save the patient's life. Despite the usually benign clinical course of VSD, serious arrhythmias occur in 16-31% of patients. Sudden death accounted for one-third of all deaths in a series of medically managed patients and occurred in 4.2% of patients in a study of VSD and arrhythmias. Cardiac hypertrophy is the common denominator in all cases reported in detail of VSD-associated sudden death. We have encountered four cases of sudden unexpected death from VSD in infants ranging in age from 1 week to 3 and (1/2) months. In each case there was cardiomegaly and in one case there was pulmonary arteriolar medial thickening, with extension of smooth muscle into small intralobular vessels. In half of our cases the attending physician was sued for malpractice. We believe that VSD in infants and young children are potentially life-threatening malformations which warrant careful clinical follow-up.

Coronary artery compression by teflon pledget granuloma following aortic valve replacement.

We describe a massive fatal posterior myocardial infarct resulting from compression of the right coronary artery by a Teflon pledget granuloma in a patient who had undergone aortic valve replacement six months before death. Other iatrogenic causes of coronary artery occlusion or compression are discussed in this paper. To our knowledge this is the first report of this surgical complication.

Alkylamine antihistamine toxicity and review of Pediatric Toxicology Registry of the National Association of Medical Examiners. Report 4: Alkylamines.

Antihistamines are popular nonprescription medications for the treatment of allergy and cold symptoms. Accidental exposures to these preparations are common with > 14,000 occurring annually in children under the age of 6 years (1). Despite this, there is limited information about toxic and lethal concentrations of these drugs in children. We present a case of a pediatric fatality due to a common brompheniramine and phenylpropanolamine preparation and review available Pediatric Toxicology Registry data on alkylamine antihistamines. The data collected by the Pediatric Toxicology Registry on the drug phenylpropanolamine has been previously reported (2). A review of the Registry data suggests that postmortem blood brompheniramine concentrations of 0.4 mg/L and greater in children is indicative of brompheniramine poisoning. However, pheniramine was also present in the blood in the same case and may have caused an additive effect. The data are insufficient to establish the threshold of fatal blood pheniramine concentration in children. Data for chlorpheniramine are lacking.

Pericardial tamponade and death from Hickman catheter perforation.

In February 1995, a 56-year-old female was taken to the operating room for routine placement of a Hickman catheter. Her internist planned palliative chemotherapy for metastatic breast cancer. Using the Seldinger technique, the right subclavian vein was entered and a Hickman catheter was placed. Shortly after extubation and arrival in the postoperative recovery unit, the patient had respiratory and cardiac arrest. Resuscitative efforts, including chest tube placement and pericardiocentesis, were unsuccessful. Autopsy findings included perforation of the superior vena cava, with extension of the catheter in the pericardial sac and associated effusion. Despite the low reported incidence of perforation during placement of central venous catheters, we recommend confirmation of placement by fluoroscopy and instillation of radiopaque dye because of the high mortality associated with this complication.

Pediatric injuries from cardiopulmonary resuscitation.

STUDY OBJECTIVE: To assess the type, rate, and severity of unanticipated complications of CPR (external cardiac compressions and ventilation) in a pediatric population. METHODS: A retrospective review was undertaken of the records from all deceased children ( < 12 years old) who had been given CPR during an 8-year period (1988 through 1995). Patients with historical or physical evidence of preceding trauma were excluded. Clinical and autopsy records were abstracted for patient demographics, clinical findings, duration of CPR, persons administering CPR, and medical examiner summaries. RESULTS: Two hundred eleven children (mean age, 19.0 months) met the inclusion criteria and were entered into the study. The most common cause of cardiac arrest was sudden infant death syndrome (56%), followed by drowning (8%), congenital heart disease (7%), and pneumonia (4%). Mean duration of CPR was 45 minutes (range, 3 to 180 minutes). Fifteen children (7%) had at least one injury as a result of CPR; 7 (3%) had injuries that were considered medically significant. These included retroperitoneal hemorrhage (n = 2), pneumothorax (n = 1), pulmonary hemorrhage (n = 1), epicardial hematoma (n = 1), and gastric perforation (n = 1); in spite of prolonged resuscitation performed with variable degrees of skill, only one patient was noted to have rib fractures. CONCLUSION: Significant iatrogenic injuries are rare in children who receive CPR; they occur in approximately 3% of cases. Recognizing the possibility of a complication may help in the management of children who survive cardiac arrest. Regardless of resuscitation history, abuse should be considered whenever traumatic injuries are encountered.

Unexpected deaths due to colloid cysts of the third ventricle.

Colloid cysts of the third ventricle are rare central nervous system tumors that are a recognized cause of unexpected death in young, otherwise healthy adults and children. We report three adults and one child who died from colloid cysts of the third ventricle. Our report illustrates the difficulties of diagnosing these tumors premortem.

Fatal stercoral ulcer perforation: case report.

Stercoral ulcers result from severe, prolonged constipation. Stercoral ulcer perforation is a rare event resulting in severe peritonitis and has a very high associated mortality rate. We describe a 78-year-old man with severe constipation associated with stercoral ulcer perforation undiagnosed prior to autopsy.

Myasthenia gravis-associated systemic vasculitis and myocarditis with involvement of the cardiac conducting tissue.

We describe unexpected autopsy findings in an elderly woman with myasthenia gravis (MG) who had myocarditis of the working and conducting myocardium and coronary and renal vasculitis. Myasthenia gravis, characterized by autoantibodies to the acetylcholine receptor in the postsynaptic cell membrane, may be associated with other autoimmune disorders. An additional manifestation of autoimmunity is the presence of heart muscle antibodies, which may be the basis for myocarditis, which has been reported in up to 60% of MG patients at autopsy. Although myocarditis of the working myocardium is rather common, conduction system myocarditis and systemic vasculitis have not been previously reported in MG.

Homicidal cardiac lacerations in children.

We report six cases of intentionally inflicted cardiac laceration. The victims ranged in age from 9 weeks to 2 1/2 years. Five victims were girls and in five cases the right atrium was lacerated. The left ventricle was lacerated in the other case. In the three cases with a confession, one victim each was struck with a fist, stomped, and kicked. Four patients had rib fractures, with at least two fractures in each case. Cardiac rupture from blunt trauma most commonly results from compression of the heart between the sternum and vertebral column, but may also occur from compression of the abdomen or legs, deceleration, blast injury, puncture of the heart by a fractured rib, and rupture through a resolving contusion. Accidentally acquired cardiac lacerations usually result from motor vehicle accidents or similarly severe forces. In children there are neither well documented cases of cardiac laceration nor of rib fractures from cardiopulmonary resuscitation. Cardiac lacerations, as with other types of severe trauma acquired at home, are almost never accidental.

Anomalous coronary arteries: a multicenter pediatric autopsy study.

Anomalous coronary arteries (ACAs) are a potential cause of myocardial ischemia resulting in arrhythmias, angina, infarction, and sudden death. We analyzed 7857 pediatric autopsy cases from four tertiary centers to gain an overall picture of the range and significance of ACAs within this pediatric autopsy population. The incidence of ACAs was 0.5%, with ectopic origin from the aorta (43%) being most frequent, followed by ACA arising from the pulmonary trunk (40%). The mean age at death was 2.2 years (4 h-14 years). ACAs were associated with other anomalies in 57% of cases, 43% of these being cardiac defects. Growth retardation was noted in 50% of the cases. Examination of the heart showed cardiomegaly in 92% of cases, which was marked (> 95 percentile) in 63%, but histologically apparent ischemic damage was seen in only 50% of cases. ACAs arising from the pulmonary trunk were associated with earlier death (1.4 years), more frequent cardiomegaly (100%), and more frequent myocardial scarring (92%) than other types of anomalies. Although the terminal presentation was sudden death in 45% of cases, ACAs associated with other cardiac defects presented mainly with problems related to the latter anomalies. The results highlight the need to examine coronary arteries carefully during the pediatric autopsy. Not only are the positions of the coronary artery ostia important, but also the variations in the angles of arterial take-off, initial courses through the aortic adventitia, subsequent courses, and presence of ostial ridges or membranes that may result in significant compromise of blood flow.