Portal Hypertension — Surgical Management

Portal hypertension is a sustained pathological rise in portal venous pressure, most often from cirrhosis, whose dreaded complication is variceal haemorrhage. This topic ties together hepatic vascular anatomy, the physiology of portosystemic collaterals, and a hierarchy of endoscopic, radiological and surgical interventions that are repeatedly tested in advanced NEET PG surgery questions.

Definition and haemodynamic thresholds

Portal hypertension is defined as a portal venous pressure > 5 mmHg above the inferior vena caval pressure, or in practice an elevated hepatic venous pressure gradient (HVPG). HVPG is the gold-standard measurement: it is the difference between the wedged hepatic venous pressure (≈ sinusoidal/portal pressure) and the free hepatic venous pressure.

HVPG value	Interpretation
1–5 mmHg	Normal
6–9 mmHg	Subclinical / pre-clinical portal hypertension
≥ 10 mmHg	Clinically significant portal hypertension — varices develop
≥ 12 mmHg	Threshold for variceal bleeding
≥ 16–20 mmHg	Higher mortality, poor control of acute bleed

High-yield: Varices form once HVPG ≥ 10 mmHg, but bleeding does not occur until HVPG ≥ 12 mmHg. Reducing HVPG below 12 (or by > 20% from baseline) essentially abolishes the risk of rebleeding — the goal of pharmacotherapy.

Classification by site of obstruction

The most exam-friendly classification is anatomical — prehepatic, hepatic (presinusoidal / sinusoidal / postsinusoidal), and posthepatic.

Level	Causes	Key clue
Prehepatic	Portal/splenic vein thrombosis, congenital atresia, extrinsic compression	Normal liver function, normal wedged hepatic pressure; commonest cause of portal HTN in children
Hepatic — presinusoidal	Schistosomiasis, congenital hepatic fibrosis, sarcoidosis, early PBC, idiopathic non-cirrhotic portal HTN	Wedged hepatic pressure normal
Hepatic — sinusoidal	Cirrhosis (commonest cause overall), alcoholic hepatitis	Wedged hepatic pressure raised
Hepatic — postsinusoidal	Veno-occlusive disease (sinusoidal obstruction syndrome)	Wedged pressure raised
Posthepatic	Budd–Chiari syndrome, IVC web, constrictive pericarditis, right heart failure	Hepatic vein outflow block

High-yield: Cirrhosis is the commonest cause of portal hypertension worldwide and in adults; extrahepatic portal vein obstruction (EHPVO) is the commonest cause in children. Schistosomiasis is the commonest cause of presinusoidal portal hypertension globally. Non-cirrhotic portal fibrosis (NCPF / idiopathic portal hypertension) is an important Indian cause with preserved liver function.

Pathophysiology — why pressure rises and stays high

Two mechanisms act together:

1. Increased intrahepatic resistance — fixed (fibrosis, regenerative nodules distorting sinusoids) plus a dynamic component (activated stellate cells, deficient intrahepatic nitric oxide, endothelin).
2. Increased portal inflow — splanchnic arteriolar vasodilatation (excess NO in the splanchnic bed) raises flow into an already obstructed portal system — the hyperdynamic circulation.

Pathophysiology flow: Hepatic injury → fibrosis & sinusoidal distortion → ↑ intrahepatic resistance → portal pressure rises → splanchnic vasodilatation & ↑ inflow → portosystemic collaterals open → varices, splenomegaly, hyperdynamic circulation → ascites, encephalopathy, variceal bleed.

Portosystemic anastomoses (must-know anatomy)

When portal pressure rises, blood is diverted to systemic veins through pre-existing communications. These are favourite anatomy-clinical correlation questions.

Site	Portal channel	Systemic channel	Clinical result
Lower oesophagus	Left gastric (coronary) vein	Azygos / oesophageal veins	Oesophageal varices (most clinically important)
Anal canal	Superior rectal vein	Middle & inferior rectal veins	Anorectal varices (not the same as haemorrhoids)
Umbilicus	Para-umbilical veins (ligamentum teres)	Superficial epigastric veins	Caput medusae
Bare area of liver / retroperitoneum	Veins of Retzius	Retroperitoneal veins	Retroperitoneal collaterals
Diaphragm	Veins of Sappey	Diaphragmatic veins	—

High-yield: Caput medusae (radiating from umbilicus) is portal hypertension; the dilated veins of IVC obstruction radiate over the flank/back and drain upward. A venous hum over the umbilicus = Cruveilhier–Baumgarten syndrome (recanalised umbilical vein).

Mnemonic for collateral sites — "BERGER" is sometimes used; simpler is to remember the four classic clinically visible sites: oesophagus, rectum, umbilicus, retroperitoneum.

Clinical features

• Variceal haemorrhage — painless, massive haematemesis ± melaena; the lethal presentation.
• Splenomegaly with hypersplenism (thrombocytopenia, leucopenia, anaemia).
• Ascites (sinusoidal/postsinusoidal lesions, with portal HTN + hypoalbuminaemia).
• Caput medusae, dilated abdominal wall veins.
• Features of the underlying liver disease — jaundice, spider naevi, palmar erythema, gynaecomastia, encephalopathy.

High-yield: Thrombocytopenia in a cirrhotic is usually due to hypersplenism + reduced thrombopoietin, not marrow failure. Splenomegaly with normal liver function in a young patient points to EHPVO / NCPF.

Diagnosis and investigation of choice

• Upper GI endoscopy — the investigation of choice to detect and grade oesophageal/gastric varices and to confirm the bleeding source. Every newly diagnosed cirrhotic should undergo screening endoscopy.
• Doppler ultrasound — first-line non-invasive: portal vein patency, flow direction (hepatopetal vs hepatofugal), portal vein diameter (> 13 mm suggestive), splenomegaly, ascites, collaterals.
• HVPG measurement — gold standard to quantify portal pressure and prognosticate.
• CT/MR angiography (portal venography) — maps anatomy before shunt surgery/TIPSS, detects thrombosis.
• Transient elastography (FibroScan) — non-invasive surrogate for fibrosis and portal HTN risk.

Varices that warrant prophylaxis are large (> 5 mm) varices, or any varices with red wale signs, or in a Child–Pugh C patient.

Management — a staged approach

Management is divided into prevention of first bleed (primary prophylaxis), control of acute bleeding, and prevention of rebleeding (secondary prophylaxis).

Primary prophylaxis

• Non-selective beta-blockers (NSBB) — propranolol, nadolol, or carvedilol — reduce portal inflow (β2 blockade → splanchnic vasoconstriction; β1 → ↓ cardiac output). Drug of choice for primary prophylaxis. Target: 25% fall in resting heart rate or HR ≈ 55/min.
• Endoscopic variceal ligation (EVL / banding) — for those intolerant of NSBB or with high-risk varices.

High-yield: Carvedilol (additional anti-α1 activity) is increasingly preferred as it lowers HVPG more than propranolol. NSBBs are relatively contraindicated in refractory ascites / spontaneous bacterial peritonitis at high doses (the "window hypothesis").

Acute variceal bleeding — stepwise resuscitation

ABC resuscitation → restrictive transfusion (Hb target ~ 7–8 g/dL) → vasoactive drug (terlipressin / octreotide / somatostatin) → prophylactic antibiotics (ceftriaxone) → urgent endoscopy within 12 h → endoscopic band ligation → balloon tamponade as bridge if uncontrolled → TIPSS / surgery as rescue.

• Pharmacological: Terlipressin is the drug of choice (reduces splanchnic flow, improves survival, reduces hepatorenal syndrome). Alternatives: octreotide, somatostatin, vasopressin (+ nitroglycerin to limit cardiac ischaemia).
• Antibiotics: IV ceftriaxone — mandatory; reduces infection, rebleeding and mortality.
• Endoscopic therapy: Band ligation is superior to sclerotherapy for oesophageal varices. Gastric varices are best treated with endoscopic cyanoacrylate (glue) injection.
• Balloon tamponade: Sengstaken–Blakemore tube (3 lumens: gastric balloon, oesophageal balloon, gastric aspiration) or Minnesota tube (4 lumens — adds oesophageal aspiration). A temporary bridge for ≤ 24 h; risk of oesophageal necrosis, aspiration, rupture.
• Rescue / "early TIPSS": Transjugular Intrahepatic Portosystemic Shunt for failure of endoscopic control, or pre-emptively within 72 h in high-risk Child B (active bleed) / Child C (< 14) patients.

High-yield: Always deflate the oesophageal balloon first and keep scissors at the bedside (to cut the tube if airway obstruction occurs) with a Sengstaken–Blakemore tube. Gastric balloon is inflated first to anchor; oesophageal balloon only if bleeding continues.

TIPSS (Transjugular Intrahepatic Portosystemic Shunt)

A radiologically created stent channel between a hepatic vein and an intrahepatic branch of the portal vein, decompressing the portal system without open surgery.

• Indications: refractory variceal bleeding, refractory ascites, Budd–Chiari, hepatic hydrothorax, as a bridge to transplant.
• Main complication: new or worsening hepatic encephalopathy (≈ 25–35%, because portal blood bypasses the liver), shunt stenosis/thrombosis, hepatic decompensation.
• Contraindications: severe hepatic failure (high bilirubin), heart failure, polycystic liver, severe encephalopathy.

High-yield: TIPSS has largely replaced emergency surgical shunts. Covered (PTFE) stents have far better patency than bare stents.

Surgical management — shunt and non-shunt procedures

Surgery is now reserved for failure of endoscopic/TIPSS therapy, or where TIPSS is unavailable, and especially in good-liver-function patients (Child A) or non-cirrhotic portal hypertension. Operations are broadly shunt (divert portal blood to systemic circulation) or non-shunt / devascularisation (interrupt the variceal collaterals).

Shunt classification

Type	Examples	Feature
Total (non-selective)	Portacaval (end-to-side / side-to-side), proximal splenorenal, mesocaval (mesentericocaval)	Divert all portal flow → best at controlling bleed but highest encephalopathy & liver failure
Selective	Distal splenorenal (Warren) shunt, left gastric–caval (Inokuchi)	Decompress only gastrosplenic varices, preserve portal perfusion of liver → less encephalopathy
Partial	Small-diameter (8 mm) interposition H-graft portacaval shunt	Calibrated partial decompression

Eponymous shunts to memorise:

• Warren shunt = distal splenorenal shunt (DSRS): the splenic vein is divided and its distal (splenic) end anastomosed to the left renal vein; the coronary and gastroepiploic veins are ligated. This selectively decompresses oesophagogastric varices through the spleen while leaving portal flow to the liver intact — hence lowest rate of post-shunt encephalopathy. Best for Child A patients with preserved liver function and good for non-cirrhotic causes. Not suitable if intractable ascites is present (it can worsen ascites).
• Mesocaval (mesentericocaval) shunt: superior mesenteric vein joined to the IVC, usually with an interposition graft (Drapanas) — useful when the portal vein is thrombosed; technically easier in emergencies.
• Portacaval shunt: portal vein to IVC; the classic total shunt — most effective at stopping bleeding but worst encephalopathy; side-to-side also decompresses the hepatic sinusoids and helps refractory ascites/Budd–Chiari.
• Proximal splenorenal shunt (Linton): splenic vein (proximal end) to renal vein with splenectomy — a total shunt, also treats hypersplenism.
• Inokuchi shunt: left gastric vein to IVC — selective.

High-yield: Warren (distal splenorenal) shunt = lowest encephalopathy because it is selective and preserves hepatopetal portal flow. Portacaval shunt = most effective at controlling bleeding but highest encephalopathy. This trade-off (control vs encephalopathy) is the single most repeated MCQ concept.

Non-shunt (devascularisation) procedures

• Sugiura procedure — extensive oesophagogastric devascularisation + oesophageal transection + splenectomy ± pyloroplasty + vagotomy, performed thoraco-abdominally (modified versions are abdominal only). Used when shunting is not feasible; preserves portal flow so encephalopathy is rare, but rebleeding rate is higher.
• Hassab procedure — gastro-oesophageal devascularisation with splenectomy (a simpler devascularisation).
• Oesophageal transection and re-anastomosis with a stapler.

Splenectomy and segmental portal hypertension

Left-sided / sinistral (segmental) portal hypertension results from isolated splenic vein thrombosis (classically secondary to chronic pancreatitis or pancreatic cancer). It causes isolated gastric varices with a normal liver. The definitive cure is splenectomy, which removes the inflow to the collateral bed.

High-yield: Isolated gastric varices + history of pancreatitis + normal liver function = splenic vein thrombosis (sinistral portal hypertension). Treatment = splenectomy. This is one of the few causes of variceal bleeding cured by surgery.

Liver transplantation

The only treatment that addresses both portal hypertension and the underlying liver failure. It is the definitive option for decompensated cirrhosis (Child C) and is preferred over shunt surgery when transplant is available; shunts can complicate later transplantation (mesocaval and proximal splenorenal interfere least).

Choosing therapy by Child–Pugh class

Child class	Preferred strategy
Child A (good function)	Endoscopic therapy + NSBB; if surgery needed, selective (Warren) shunt
Child B	Endoscopic + NSBB; early TIPSS if high risk
Child C	Endoscopic + TIPSS as bridge; liver transplant is definitive

Complications

• Variceal haemorrhage (commonest cause of death).
• Hepatic encephalopathy — worsened by shunting/TIPSS.
• Ascites and spontaneous bacterial peritonitis.
• Hepatorenal and hepatopulmonary syndromes, porto-pulmonary hypertension.
• Hypersplenism — cytopenias.
• Portal hypertensive gastropathy (mosaic/snakeskin mucosa) and GAVE (gastric antral vascular ectasia / watermelon stomach).
• Portal vein thrombosis.

Key differentials

• Upper GI bleed: distinguish variceal from peptic ulcer, Mallory–Weiss tear, gastric malignancy — endoscopy decides.
• Causes of splenomegaly: haematological malignancy, infections (malaria, kala-azar), storage disorders — vs congestive splenomegaly of portal HTN.
• Cause of ascites: cardiac, malignant, tubercular vs portal hypertensive — serum-ascites albumin gradient (SAAG) ≥ 1.1 g/dL = portal hypertensive ascites.
• Caput medusae vs IVC obstruction collaterals — direction of flow below umbilicus (downward in portal HTN, upward in IVC block).

Recently asked / exam angle

• Warren shunt = distal splenorenal, the selective shunt with the least encephalopathy — repeatedly asked as a one-liner.
• Match the shunt to its description: portacaval (total), mesocaval (uses SMV–IVC graft, good when portal vein thrombosed), DSRS/Warren (selective).
• Sugiura procedure components (devascularisation + transection + splenectomy ± vagotomy/pyloroplasty).
• Sengstaken–Blakemore (3 lumens) vs Minnesota tube (4 lumens) — number and function of lumens; deflate oesophageal balloon first.
• TIPSS connects hepatic vein to portal vein; chief complication = encephalopathy.
• HVPG cut-offs: > 10 mmHg varices, > 12 mmHg bleed.
• Drug of choice in acute variceal bleed = terlipressin; antibiotic prophylaxis = ceftriaxone; primary prophylaxis = non-selective beta-blocker / carvedilol.
• Gastric varices — endoscopic cyanoacrylate glue is treatment of choice.
• Sinistral (left-sided) portal hypertension from splenic vein thrombosis → isolated gastric varices → cured by splenectomy.
• Commonest cause of portal HTN: cirrhosis (adults), EHPVO (children), schistosomiasis (presinusoidal worldwide), NCPF in India.

Rapid revision

1. Portal HTN = portal pressure > 5 mmHg above IVC; HVPG ≥ 10 mmHg → varices, ≥ 12 mmHg → bleeding.
2. Cirrhosis = commonest cause overall; EHPVO = commonest in children; schistosomiasis = commonest presinusoidal.
3. Investigation of choice for varices = upper GI endoscopy; gold standard pressure = HVPG.
4. Acute bleed: resuscitate → terlipressin + ceftriaxone → band ligation; gastric varices → glue.
5. Sengstaken–Blakemore = 3 lumens; Minnesota = 4 lumens; bridge ≤ 24 h, deflate oesophageal balloon first.
6. TIPSS = hepatic vein ↔ portal vein stent; main complication = encephalopathy.
7. Warren (distal splenorenal) shunt = selective, least encephalopathy, preserves portal flow; avoid if ascites.
8. Portacaval shunt = total, best bleeding control, worst encephalopathy; side-to-side helps ascites/Budd–Chiari.
9. Mesocaval shunt = SMV–IVC graft, useful when portal vein thrombosed.
10. Sugiura = oesophagogastric devascularisation + oesophageal transection + splenectomy ± vagotomy/pyloroplasty.
11. Splenic vein thrombosis (post-pancreatitis) → isolated gastric varices (sinistral PHT) → splenectomy cures.
12. SAAG ≥ 1.1 g/dL indicates portal hypertensive ascites; caput medusae = portal HTN, Cruveilhier–Baumgarten hum = recanalised umbilical vein.