Clinical Case Secnario
A 37-year-old male with a long-standing history of chronic smoking (15 pack-years) presented to the emergency department with the acute onset of excruciating, constant, epigastric pain that radiated sharply to his back. This severe pain began approximately 12 hours before presentation and was accompanied by multiple episodes of non-bloody, bilious vomiting and complete loss of appetite (anorexia). He is a chronic smoker (15 pack years) who denies any history of alcohol abuse, recent abdominal trauma, prior surgeries, or known history of gallstones. There has been no history of recent medication intake. Upon admission, he was diagnosed with moderate acute pancreatitis secondary to severe hypertriglyceridemia (serum triglyceride 2902 mg/dL), as supported by initial lab findings and imaging (modified CT scan severity index of 6/10) (Figure 1). He also exhibited signs of systemic inflammatory response syndrome (SIRS), including a fever of 38.5°C on arrival and a respiratory rate of 30 breaths/minute.
Figure 1: Contrast-enhanced CT abdomen
Figure 2: Settings of the extracorporeal therapy
Figure 3: Machine used for extracorporeal therapy
Figure 4: Filtered plasma of the patient, collected as effluent in the bag (yellowish colored as the effluent is lipemic secondary to the high level of triglycerides)
Wrong Answer: A) While preventing severe complications like necrotizing pancreatitis is an overarching goal in acute pancreatitis, the primary and immediate mechanism by which therapeutic plasma exchange works in hypertriglyceridemia-induced acute pancreatitis is the direct removal of triglycerides. A CTSI of 6/10 indicates moderate pancreatitis, but the direct action of therapeutic plasma exchange is not solely about preventing necrosis but addressing the root cause (hypertriglyceridemia).
Right Answer: B) This is the most accurate statement. In severe hypertriglyceridemia-induced acute pancreatitis, extremely high triglyceride levels are directly toxic to pancreatic acinar cells, leading to inflammation and damage. Therapeutic plasma exchange rapidly lowers these levels, mitigating the causative factor and interrupting the inflammatory cascade.
Explanation The extracorporeal therapy being used is therapeutic plasma exchange (TPE). Therapeutic plasma exchange (TPE), also known as plasmapheresis, involves removing and replacing a patient's blood plasma. It is an "extracorporeal" therapy, meaning the blood is processed outside the body. During TPE, blood is drawn from the patient and passed through a specialized machine that separates the plasma (the liquid component of blood containing proteins, antibodies, and other substances) from the blood cells. The diseased or harmful plasma, which may contain pathogenic substances like excessively high triglycerides or autoantibodies, is then discarded. The patient's blood cells are then returned to their body along with a replacement fluid, typically albumin or fresh frozen plasma, to restore normal blood volume and function. This process aims to rapidly remove harmful circulating components from the bloodstream that are contributing to a patient's illness.
Clinical pearl: ● Hypertriglyceridemia-induced acute pancreatitis is a distinct entity with significant morbidity and mortality ● Supportive management is similar to other causes of acute pancreatitis ● Specific therapies tailored to lower serum triglyceride levels include therapeutic plasma exchange, insulin, heparin infusion ● After the resolution of the acute event, diet modifications, lifestyle changes, and hypolipidemic drugs are continued to prevent further episodes
Wrong Answer: C) While insulin and heparin infusions are indeed conventional therapies for hypertriglyceridemia, in cases of severe hypertriglyceridemia-induced acute pancreatitis, especially with very high triglyceride levels or worsening clinical status, therapeutic plasma exchange is often initiated early rather than waiting for "failure" of conventional therapy. Its rapid triglyceride-lowering effect makes it a frontline intervention in these severe cases.
Wrong Answer: D) While amylase and lipase levels are markers of pancreatic inflammation, their decrease is a consequence of effective treatment and resolution of pancreatitis. The direct and most effective way to monitor the success of therapeutic plasma exchange in hypertriglyceridemia-induced acute pancreatitis is by tracking the reduction in serum triglyceride levels, as this is the direct target of the therapy. TPE effectively reduces serum TG by 50–80% within hours. Amylase and lipase levels may take longer to normalise.
