Drain Placement

Part of Surgery

Using drains to remove fluid, blood, and pus from wounds and body cavities to prevent infection and promote healing.

Why This Matters

Fluid that accumulates in a wound or body cavity after surgery or injury is not passive. Blood pooled in a wound becomes a growth medium for bacteria within hours. Pus under pressure is not only painful but toxic to surrounding tissue. Bile, urine, or bowel contents leaking into the abdomen destroy surrounding structures rapidly. Without a way to remove these fluids, the post-operative period becomes a waiting game for infection.

Drains solve this by providing a conduit from the problem area to the outside. Done correctly, drain placement is simple, effective, and can prevent the most common serious post-surgical complications. Done incorrectly — wrong placement, inadequate securing, premature removal — drains cause more problems than they prevent.

Understanding when to drain, what to drain with, and how to manage drainage is a critical post-surgical skill. In many cases, adequate drainage of an infected or contaminated space is more important than the surgery itself.

When Drains Are Indicated

Strong indications:

• After abdominal surgery with any contamination (intestinal contents, bile, pus)
• Abscess cavities after incision and drainage
• Hemothorax (blood in chest cavity) or empyema (pus in chest cavity)
• Perforated appendicitis or perforated bowel repair
• Dead space too large to close (prevents seroma/hematoma formation)
• Pancreatic or liver trauma or surgery (high risk of bile/pancreatic fluid leakage)

Moderate indications (based on clinical judgment):

• After mastectomy or other surgery creating large skin flaps (prevents seroma)
• Clean elective abdominal procedures (many surgeons do not drain these)
• After joint surgery in contaminated fields

Drains are NOT indicated for:

• Clean wounds with primary closure and no dead space
• Fresh wounds being left open to heal by secondary intention (the open wound IS the drain)
• Routine elective clean surgery in a well-nourished patient

Types of Drains

Passive Drains (Gravity)

Fluid flows by gravity or through wicking, without suction.

Penrose drain: a flat rubber tube, soft and flexible. Fluid drains around and through it by gravity and capillary action. Simplest design; easy to improvise.

Corrugated drain: ridged rubber or firm material. The corrugations create channels along the drain surface. Slightly better flow than flat Penrose.

Improvised passive drain materials:

• Rubber tubing from any source (fuel line, plant extract tubing)
• Latex finger cut from rubber glove
• Thin-walled bamboo tube (must fit the space)
• Soft plant stems (reed, bamboo grass) — short-term use only

Active Drains (Suction)

Create negative pressure to draw fluid through the drain. More effective than passive drains for high-output fluid collections but require an external suction device.

Improvised suction drain:

1. A tube from the wound to an external glass or sealed clay container
2. The container is initially empty and sealed
3. As fluid flows in, slight negative pressure develops
4. Or: squeeze a rubber bulb attached to the drain tube to create suction, then close the valve

Without suction capability, passive drains function adequately for most post-collapse situations.

Fabricating a Simple Passive Drain

For a Penrose-type improvised drain:

1. Take a piece of natural rubber tubing or a rubber finger from a glove
2. Cut to appropriate length (length of wound cavity plus 3-5 cm extending outside)
3. Make several side holes along the internal portion (3-4 holes, using scissors or knife tip) — these allow fluid to enter the drain from multiple directions
4. Ensure the exterior end will exit at the lowest point of the wound (gravity drainage)
5. The drain is not sterilized by autoclave — boiling for 20 minutes is the best available sterilization for rubber

Wick drain alternative: Multiple lengths of clean boiled cloth are placed into a wound cavity and brought out through a small exit hole. The cloth wicks fluid by capillary action. Replace the wick daily by gently withdrawing old cloth and inserting fresh.

Placing the Drain

Drain Placement Technique

1. Identify the lowest accessible point of the cavity to be drained
2. Make a small exit hole (stab incision, 0.5 cm) through the skin at this point, or use an existing wound opening
3. Pass the drain through the exit hole, into the cavity
4. The drain tip should sit in the most dependent part of the cavity (where fluid will pool)
5. Secure the drain to the skin at its exit point with a single non-absorbable suture (prevents it being pulled in or falling out)
6. Dress the exit site with clean cloth and tape or bandage
7. Position the patient so the drain exit is below the cavity (gravity drainage)

The stab incision for drain exit: The main wound closure and the drain exit should NOT be the same opening. A separate small incision at the lowest point of the wound provides better drainage geometry and reduces the risk of wound disruption when the drain is eventually removed.

Securing the Drain

A drain that falls out prematurely is a failed drain. One that is pulled too far in provides no drainage. The securing suture is critical:

• Single suture through the skin, 1-2 mm from the drain
• Tied around the drain, not through it
• Knot should be firm but not so tight it cuts the drain
• An additional mark on the drain at skin level (a stitch or tape mark) allows early detection of migration

Managing Drain Output

Documentation

Record drain output at least once daily:

• Volume of drainage
• Color and character: bloody, serous (clear pale yellow), turbid/cloudy, purulent (thick, pus)
• Smell: absence is good; foul smell indicates active infection

Expected drainage patterns:

Post-surgical day	Expected character	Action if abnormal
Day 1-2	Bloody or blood-tinged	Normal — fresh surgical drainage
Day 2-4	Becoming serous (yellow)	Normal progression
Day 4-7	Decreasing volume, clear serous	Normal — ready to consider removal
Any day	Increasing volume	Investigate source
Any day	New purulent character	Infection — do not remove drain yet
Any day	Bowel content / bile	Bowel or biliary leak — urgent reassessment

When to Remove the Drain

Remove when:

• Output is less than 20-30 mL per 24 hours
• Output is clear serous (no blood, no pus)
• Patient shows no signs of infection
• Minimum 48-72 hours have passed since placement (drains removed too early allow re-accumulation)

Do not remove if:

• Output is still significant or actively purulent
• Patient has fever suggesting ongoing infection
• There is evidence of bowel or biliary leak

Drain Removal Technique

1. Cut the securing suture
2. Withdraw slowly and steadily — do not yank
3. If resistance is met, do not force — adhesion to surrounding tissue may require gradual daily shortening (pull out 1-2 cm per day)
4. After removal, cover the exit site — it will close on its own within 24-48 hours
5. Watch for re-accumulation of fluid in the days following removal

Complications of Drains

Drain-related infection: any drain is a path for external bacteria to enter the body. Change dressings daily; never advance a drain back in once withdrawn.

Pressure necrosis: a drain resting against a major blood vessel or hollow organ for days causes pressure injury. After placing, confirm the drain lies against dependent tissue only, not against bowel or vessels.

Drain falling out prematurely: suture securely; tie a knot in the external portion of drain as backup against complete retraction.

Retained drain: most serious complication — a drain fragment left inside the body becomes a nidus for chronic infection. Always inspect a removed drain to confirm it is intact.

Chest Drainage

Hemothorax (blood in chest) or empyema (pus in chest) requires chest drainage — a special application.

1. Position patient sitting upright or at 45 degrees
2. Identify the 5th-6th intercostal space in the midaxillary line (armpit line), on the affected side
3. Local anesthetic to skin and deeper layers
4. Small incision through skin and muscle, finger-dissect through into the pleural space
5. Insert a thick tube drain (the finger creates the tract and confirms position)
6. Secure and connect to underwater seal (tube end submerged in water in a collection vessel — allows air and fluid out but prevents air entering on inspiration)
7. The underwater seal bottle must remain below the level of the patient’s chest at all times

Chest drainage is a more complex procedure but follows the same principles as abdominal drainage. The underwater seal is critical — without it, each breath would draw air into the chest, causing progressive tension pneumothorax (collapsed lung from air accumulation).