Gastric Dilatation-Volvulus (Canine) — NAVLE Prep

Quick anchor

Trigger

Deep-chested dog + unproductive retching

First step

Shock stabilization + decompression

Confirm

Right lateral: double bubble

Trap

Do not wait for perfect diagnostics

High-yield takeaways

Start with the safest next step, then narrow the case using signalment, timeline, exam findings, diagnostics, and response to treatment.
Use the traps, differentials, and practice questions to rehearse NAVLE-style reasoning instead of memorizing isolated facts.
This educational study page is not a clinical protocol; confirm patient-specific decisions with current references and clinician judgment.

30-second revision

Classic patternDeep-chested dog + retching + distension

First moveFluids + decompression

ConfirmRight lateral double bubble

Definitive therapySurgery + gastropexy

MonitorPerfusion and arrhythmias

Critical distinctionGDV vs simple dilation

Critical trapDo not delay treatment for perfect diagnostics

Exam core — read this first

Classic pattern → unproductive retching, distended tympanic abdomen, shock

Immediate priorities → IV fluids + gastric decompression

Best confirmatory view → right lateral abdominal radiograph with double bubble / compartmentalization

Definitive management → surgery with gastropexy

Emergency Triage Alert

Time-Sensitive Surgical Triage

GDV is a critical "stop everything" emergency. Stabilization of obstructive shock and decompression must be initiated simultaneously while preparing for immediate surgical correction.

Emergency Triage

Emergency Triage

GDV is a critical time-sensitive emergency. Triage priority is highest; stabilization must occur simultaneously with preparation for surgery.

Pattern recognition

Core pattern

Unproductive retchingAbdominal distensionRapid shock

Supporting clues

RestlessnessHypersalivationDeep-chested breedWeak pulsesTympany

NAVLE trigger: Retching without producing vomit in a distended, crashing deep-chested dog is GDV until proven otherwise.

Decision core — what NAVLE actually asks

Shocky patient

→ Large-bore IV access, fluids, and decompression first

Need confirmation after initial stabilization

→ Right lateral abdominal radiograph: double bubble, reverse C / Popeye arm, soft-tissue shelf

After stabilization and diagnosis

→ Surgery with derotation, stomach assessment, and gastropexy

Key interpretation

Radiograph

Double bubble

Right lateral: pylorus dorsal/cranial to fundus with soft-tissue shelf

Lactate

Trend it

Poor perfusion/prognosis marker; improvement after resuscitation helps

ECG

Arrhythmias possible

Monitor during and after surgery

Perfusion

Shocky

Treat the patient, not the image first

Abdomen

Tympanic distension

Physical exam matters

Spleen

May be displaced

Often involved but not the main clue

⚠ Lactate helps prognosticate and track response, but it should not delay decompression or surgery.

Treatment

Step 1

Aggressive IV shock therapy

Restore perfusion while preparing decompression.

Step 2

Gastric decompression

Orogastric tube if possible, trocarization if needed.

Step 3

Surgery with gastropexy

Definitive therapy; medical stabilization alone is not enough.

Prevent

Prophylactic gastropexy

Discuss for high-risk breeds or strong family history; reduces volvulus/recurrence risk but not simple dilation.

Pharmacology pearls

Lidocaine

Class: Antiarrhythmic (Class Ib)

Logic: Treat ventricular arrhythmias

Board Pearl: Commonly used if VPCs or V-tach develop post-decompression / perioperatively.

Pure Mu Opioids

Class: Analgesic

Logic: Pain management

Board Pearl: Hydromorphone or methadone; avoid morphine due to potential histamine release/vomiting.

Isotonic Crystalloids

Class: Fluid Therapy

Logic: Shock resuscitation

Board Pearl: Large-bore front-leg catheters preferred (avoids compressed caudal vena cava).

NAVLE traps — where students lose marks

Do not let lactate become a treatment gate

Use it for perfusion/prognosis and serial response, not to postpone decompression or surgery.

Simple bloat is not the same as volvulus

The radiograph question is often testing that difference.

Trocarization is acceptable when tube passage fails

Boards want decompression, not paralysis by perfectionism.

Medical stabilization alone is not definitive

The dog still needs surgery and gastropexy.

Differentials — how to separate these on NAVLE

Fast separator: GDV is the crashing deep-chested dog with unproductive retching and abdominal tympany. The board contrasts it with simple dilation and other acute abdomen causes.

Disease	Retching	Radiograph	Key separator
GDV	Common	Compartmentalized stomach	Shock + distension + surgical disease
Simple gastric dilation	Possible	No compartmentalization	Stomach dilated but not twisted
Acute pancreatitis	Vomiting more than retching	Nonspecific	No classic tympanic abdominal distension
Splenic torsion	Absent	Different mass effect	Can look shocky but lacks classic retching
Hemoabdomen	Absent	Loss of detail	Weak pulses without gas-distended abdomen

Practice questions

Pre-built NAVLE-style · Gastric dilatation-volvulus

0 / 0

Q1Recognition

Which patient presentation is most classic for canine GDV?

Q2First step

What is the most appropriate immediate action in the unstable GDV patient?

Q3Imaging

Which radiographic study is most classically used to confirm GDV after initial stabilization?

Q4Definitive care

After initial stabilization and diagnosis of GDV, what is the definitive treatment?

Q5Case drill

A 7-year-old Great Dane arrives in shock after repeated unproductive retching. Initial lactate is high, decompression and IV stabilization improve pulse quality, and a right lateral abdominal radiograph shows a gas-distended compartmentalized stomach with a soft-tissue shelf and pylorus dorsal/cranial to the fundus. Lactate is improving but still abnormal. What is the best next plan?

← Previous

Diabetic ketoacidosis

Immune-mediated hemolytic anemia