Hemostasis and Energy: Electrosurgery and Its Safety

This is Unit Twenty-Three of Tech in Surgery Prep. Unit Twenty-Two ended with a scrub person naming each instrument as it was passed. This unit turns to controlling bleeding, by hand and by energy, and to the burns energy can cause. Carry one idea through this lecture. A surgeon repeatedly asking for more power can be a sign that the pad's contact has failed, and that is worth checking before turning the power up. Warning signs are noticed often; what fails is connecting them. A worked example near the end shows four missed chances that each pointed to the same cause. By the end you will be able to explain mechanical hemostasis. To explain how electrosurgery works and its two modes. To prevent pad burns and other energy burns. And to plan for major bleeding and read the warning signs at the device.

Four entries on why hemostasis matters and the mechanical ways bleeding is controlled.

Why bleeding is controlled.

TSC 551 Why Hemostasis Matters

Hemostasis, controlling bleeding, keeps the field visible and protects the patient from blood loss. The body handles small vessels; larger ones usually need clamps, ties, clips or energy. Excessive bleeding can become hemorrhage, one of the complications the whole team prepares for.

Without heat.

TSC 552 Mechanical Hemostasis

Mechanical hemostasis closes or compresses vessels without heat. Pressure, with sponges or a hand, slows bleeding and lets clotting work. Hemostatic clamps grasp and hold a vessel closed. Ligatures, suture ties, close a clamped vessel permanently. Clips, metal or absorbable, close vessels or ducts, open or laparoscopic. Packing with gauze presses where bleeding is widespread or hard to reach. During bleeding, the scrub person has suction, sponges, clamps and ties ready in that order, and tracks every pad used for pressure.

Compression first.

TSC 553 Pressure and Packing

Pressure and packing control bleeding by compression, often first or when bleeding is widespread. Excessive bleeding may be packed or pressure-dressed, with laparotomy pads held or packed into a cavity. Every pad used is counted, and any left in place is documented.

Clamp, then close.

TSC 554 Clamps, Ties and Clips

Clamps, ties and clips work together: a clamp holds the vessel, and a tie or clip closes it. After a hemostat grasps a vessel, it is tied with suture or sealed with energy, and clip appliers clip vessels directly. Keep ties and loaded clip appliers ready whenever vessels are being clamped.

Four entries on how electrosurgery works, its two modes, and the safe return path for current.

Current through tissue.

TSC 555 Electrosurgery Basics

Electrosurgery passes high-frequency alternating current through tissue to cut, coagulate and seal it with heat. A generator and a handpiece, switched by hand or pedal, deliver different waveforms, and the waveform changes the effect. The current enters the patient, so the patient is part of the circuit, unlike true cautery, where a heated wire never puts current into the patient. It can be monopolar or bipolar, with related argon and ultrasonic devices. Because the patient is in the circuit, the pad, insulation, holster and settings all protect against burns, and electrosurgery is a leading ignition source for fires.

Where the current flows.

TSC 556 Monopolar and Bipolar

In monopolar electrosurgery, the active electrode is at the site, and current travels through the patient to a dispersive pad elsewhere on the body. In bipolar, the two tips of a forceps are both electrodes, so only the tissue between them is in the circuit and no pad is needed, and it works in a wet field. Monopolar coagulation spreads more heat into nearby tissue, and monopolar carries risks such as pad burns, insulation failure and current coupling. Ask which mode before the case, because monopolar needs a pad placed before draping.

Two effects.

TSC 557 Cut and Coagulate

Electrosurgical units are set to cut or coagulate by changing the waveform. Cutting divides tissue with little heat spread; coagulation seals small vessels; the surgeon chooses mode and setting. The surgeon or circulator sets the generator, and the setting is stated aloud and recorded as policy requires.

A safe way out.

TSC 558 The Return Pathway

In monopolar surgery, the dispersive pad gives current a safe path out of the patient. Its large area spreads the current, so it does not concentrate and heat the skin. Patients are positioned so they do not touch grounded metal, which could give current another way out.

Eight entries on preventing burns: at the pad, at the tip, near implanted devices and from stray energy.

When the pad burns.

TSC 559 Dispersive Pad Burns

A pad burn happens when heat at the pad is not dispersed, usually because contact is poor. Choose clean, dry, well-vascularized skin over a large muscle near the site. Avoid bony prominences, scars, fatty tissue, hair, metal implants and pressure points. Make sure the gel is moist and contact full and even. Keep prep from pooling near it. Use the unit's contact monitoring, and check and document the skin afterwards. Monitoring has made pad burns rare, not impossible: repeated requests for more power can mean the pad has failed, and that is worth checking before turning the power up.

Back in the holster.

TSC 560 The Pencil in Its Holster

The electrosurgical pencil goes back into its insulated holster whenever it is not in use. A pencil left on the drapes or patient can be activated by accident, burning the patient or igniting the drapes. Holster it every time, even for a moment's pause.

A clean tip.

TSC 561 Cleaning the Tip

Charred tissue on the tip raises resistance and can spark or ignite. The tip is wiped often with a sponge, because abrasive scratch pads can groove it and worsen build-up. A dirty tip also needs more power, which raises other risks.

Patients with implanted devices.

TSC 562 Energy and Implanted Devices

Patients with implanted electronic devices, such as pacemakers and implanted defibrillators, are at higher risk from electrosurgery, because current can interfere with them. The team identifies them beforehand and plans with anesthesia, and pads are not placed over metal implants. A device mentioned at the time out changes the energy plan.

A family of devices.

TSC 563 Types of Energy Devices

Energy devices include monopolar and bipolar electrosurgery, argon-enhanced coagulation and ultrasonic devices. The term covers tools that cut tissue or seal vessels using electricity or high-frequency sound, open or laparoscopic. Each has its own setup, settings and safety steps, so follow its instructions.

Smoke from energy.

TSC 564 Smoke From Energy Devices

Energy devices produce surgical smoke whenever they destroy tissue with heat. The smoke is captured at the source with an evacuator or filtered suction, nozzle close to the site. Exposure adds up over a career, so evacuation is used in every case that makes smoke.

Burns nobody meant.

TSC 565 Preventing Unintended Burns

A few habits prevent most unintended energy burns. Holster the pencil to prevent direct burns. Keep the foot pedal positioned and dry, and the pencil away from anything that could press it. Surgeons use the lowest effective setting for the shortest time to limit heat spread. Tips stay hot after use, so they are not rested on tissue. Inspect cords and insulated instruments, and keep cords off metal. Many energy burns are not seen at the time and appear later, so prevention depends on habits followed every time.

Vibration and sealing.

TSC 566 Ultrasonic and Vessel-Sealing Devices

Ultrasonic devices use high-frequency vibration to cut and seal at once, and advanced bipolar devices seal vessels. Ultrasonic devices spread less heat than electrosurgery but can be slower, and the back of a sealer's tip can get hot. Keep hot tips away from vital structures and off the drapes.

Four entries on planning for blood loss, residual heat, oxygen and alarms, then two worked examples. The opening idea is paid off at the first.

Planning for heavy bleeding.

TSC 567 Anticipating Major Blood Loss

Before surgery, the team discusses whether a case risks major blood loss. If it does, intravenous access and fluids or blood are arranged before incision. A known bleeding risk calls for extra sponges, suction and hemostatic supplies on the field from the start.

Heat after switching off.

TSC 568 Residual Heat

Energy devices stay hot after they are switched off, and that heat can burn tissue. The electrosurgery review notes that ultrasonic devices hold heat longest, then monopolar, then bipolar. A recently used tip is treated as hot, rested only in its holster or a safe place.

Energy and oxygen together.

TSC 569 Energy Near Oxygen

Electrosurgery is a major ignition source, and using it near supplemental oxygen or flammable prep creates fire risk. Anesthesia uses the lowest oxygen the patient needs and reduces it before energy near the airway, when warned. The surgeon warns anesthesia before activating near the head, neck or upper chest. Alcohol-based prep is fully dry, nearby sponges moist, the pencil holstered, and the setting the lowest effective. All three sides of the fire triangle meet at an active tip near oxygen, and the scrub person can prompt the warning.

Reading the warnings.

TSC 570 Warning Signs at the Energy Device

An electrosurgical unit can warn of a problem, and so can how it is used. Contact monitoring stops the current and alerts the team when pad contact fails, and a surgeon repeatedly asking for more power is another sign. An alarm is investigated, never silenced and ignored.

Four missed chances.

TSC 571 A Burn Under the Pad

A worked example, constructed for this course, pays off the opening idea. After a long abdominal case, the circulator removes the pad from the thigh and finds a red, blistered edge. The review finds four missed chances. The skin was hairy at the pad site. Contact was not rechecked after the leg was repositioned and one edge lifted. The surgeon twice asked for more power, and it was turned up. The contact alarm sounded once and was quieted by pressing on the pad. The injury is documented, treated and reported. Each sign was noticed by someone; what failed was connecting them. Hearing a request for more power, think of the pad, and say so.

Bleeding off the screen.

TSC 572 Bleeding You Can't See

A worked example, constructed for this course, follows a laparoscopic case where the view looks clear, but anesthesia reports falling blood pressure and a rising heart rate. Pat, the scrub person, remembers the bleeding risk named at the time out and quietly prepares an open set, laparotomy pads and suction. The surgeon moves the camera, finds blood pooling out of view, and converts to open. Everything is ready in moments. The circulator calls for help and blood, and the surgeon packs the area while Pat counts each pad in aloud, then clamps and ties the vessel. At closing, every pad is accounted for. Urgency did not replace the routine of counting.

Look at what you can now do. You can explain why hemostasis matters and use pressure, packing, clamps, ties and clips, with every pad tracked. You can explain how electrosurgery puts the patient in the circuit, compare monopolar and bipolar, and explain cut, coagulation and the return path. You can prevent pad burns, holster the pencil, wipe the tip, plan around implanted devices, evacuate smoke and prevent stray burns. And you can plan for major blood loss, treat used tips as hot, prompt the oxygen warning, and investigate every alarm and every request for more power. Unit Twenty-Four turns to wound classes and specimens.