Apoptosis vs Necrosis

A 72-year-old woman with chronic kidney disease develops acute tubular necrosis (ATN) following contrast-induced nephropathy. To confirm the predominant mode of renal tubular cell death and guide therapeutic intervention, which investigation would provide the most specific molecular evidence?

A 58-year-old man with acute myocardial infarction presents 6 hours after symptom onset. A cardiac biopsy is being considered to differentiate between apoptotic and necrotic myocardial injury. Which investigation is most specific for confirming apoptosis in the infarcted tissue?

A 68-year-old woman with a history of chronic hepatitis C presents with jaundice, ascites, and hepatic encephalopathy. Liver biopsy shows extensive hepatocyte necrosis with inflammatory infiltrate, ballooning degeneration, and scattered apoptotic bodies. Serum ALT is 1200 U/L, AST is 1400 U/L, and INR is 3.2. She is afebrile and hemodynamically stable. What is the most appropriate immediate next step in management?

A 52-year-old man with acute myocardial infarction presents 6 hours after symptom onset. Histopathological examination of the infarcted myocardium shows coagulation necrosis with loss of cell membrane integrity, leakage of intracellular contents, and acute inflammatory infiltrate. Which single feature BEST distinguishes this necrotic process from apoptosis?

A 38-year-old woman with systemic lupus erythematosus (SLE) develops a skin biopsy showing extensive apoptosis of keratinocytes with formation of apoptotic bodies and minimal inflammatory response. In contrast, a 45-year-old man with acute hepatitis B presents with hepatocyte necrosis, cell swelling, and prominent macrophage infiltration. Which morphological feature BEST distinguishes apoptosis from necrosis in these two patients?