BIE Diploma in Embalming - Foundation Theory cheat sheet

The cardiovascular system comprises the heart, arteries, capillaries and veins; embalming injection uses the arterial tree and drainage uses veins.

The right heart receives deoxygenated blood from the superior and inferior venae cavae and pumps it to the lungs; the left heart receives oxygenated blood from pulmonary veins and pumps it to the aorta.

Common carotid and femoral arteries are principal injection sites; axillary, brachial and radial arteries are selected when these are unsuitable.

Capillaries are one endothelial cell thick, permitting exchange of water, gases and solutes; preservative distribution depends on capillary perfusion and diffusion.

The lymphatic system returns interstitial fluid to the venous circulation; lymph nodes filter lymph and can become enlarged or obstructed, influencing oedema.

The facial nerve (cranial nerve VII) supplies muscles of facial expression; the trigeminal nerve (V) provides facial sensation.

The respiratory tract is nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles and alveoli; alveolar gas exchange occurs across a thin membrane.

Normal arterial blood pH is about 7.35–7.45; acid-base and fluid balance affect tissue appearance and post-mortem change.

Skeletal muscle contraction requires ATP and calcium; post-mortem ATP depletion contributes to rigor mortis and affects positioning.

Bacteria are classified by shape as cocci, bacilli or spirilla; Gram-positive cells retain crystal violet and Gram-negative cells counterstain pink.

Viruses are obligate intracellular parasites with no independent metabolism; enveloped viruses are generally more susceptible to disinfectants than non-enveloped viruses.

Bacterial endospores, formed by Bacillus and Clostridium species, are highly resistant to heat and many disinfectants; sterilization destroys spores.

The chain of infection has six links: agent, reservoir, portal of exit, transmission mode, portal of entry and susceptible host.

Transmission modes include contact, droplet, airborne, vector and vehicle; hand hygiene interrupts contact transmission.

Sterilization kills or removes all microorganisms including spores; disinfection reduces pathogenic microorganisms but may not destroy spores.

Prions are abnormal infectious proteins resistant to standard autoclaving and many disinfectants; special prion protocols are required.

Microbial growth curve phases are lag, exponential, stationary and decline; temperature, moisture, nutrients and pH influence growth.

Standard precautions apply to all bodies because infection status may be unknown or incorrectly reported.

Standard precautions apply to every deceased person: hand hygiene, risk-assessed PPE, sharps safety, spill management and waste segregation.

PPE is donned before exposure and removed carefully; hand hygiene follows glove removal and any contamination event.

Bloodborne viruses include hepatitis B, hepatitis C and HIV; hepatitis B is highly infectious and vaccination is available for at-risk workers.

Airborne precautions are required for pathogens such as tuberculosis, measles and varicella; aerosol-generating procedures need fit-tested respiratory protection.

Clean visible contamination before disinfection; blood spills are managed with a chlorine-releasing disinfectant at a validated concentration and contact time.

Sharps must not be recapped or bent; they are placed directly into a sharps container and needlestick injuries are reported immediately.

Healthcare waste is segregated at source into clinical, offensive, sharps and pharmaceutical or chemical streams according to local and national rules.

Embalming may be restricted or require enhanced precautions for Hazard Group 3 or 4 pathogens; follow public health and local regulatory advice.

Environmental cleaning schedules and documented decontamination reduce residual contamination on tables, instruments and trolleys.

Formaldehyde gas (CH2O) dissolves in water; formalin is typically about 37–40% formaldehyde by weight, usually with methanol as stabiliser.

Formaldehyde index = grams of formaldehyde per 100 mL of solution; it is not the same as the percentage of formalin.

Dilution follows C1V1 = C2V2, where C is concentration and V is volume; units must match.

Formaldehyde cross-links protein amino groups, fixing tissue; pH, concentration, temperature and contact time affect fixation.

Formaldehyde fixation is optimal near neutral pH; acidic conditions can promote formalin pigment, so buffers are used.

Osmosis moves water across a semipermeable membrane toward higher solute concentration; diffusion moves solutes down a concentration gradient.

Hard water contains dissolved calcium and magnesium salts; it can interact with soaps and some chemicals and affect solution clarity.

Preservative strength and volume are selected from body condition, post-mortem delay, infection risk and desired firmness; cavity fluids are more concentrated.

Aldehydes such as glutaraldehyde and formaldehyde are protein fixatives; both require COSHH assessment and exposure controls.

Formaldehyde is the primary preservative in most embalming fluids; glutaraldehyde is an alternative protein fixative with different odour and handling.

Methanol stabilises formalin and inhibits polymerisation; it is toxic and contributes to flammable and inhalation hazards.

Glycerin is a humectant that retains moisture in tissue; it is used to reduce dehydration and hardness.

Phenol is a toxic, corrosive preservative and cauterant used in cavity fluids; skin contact and inhalation must be controlled.

Dyes such as eosin, erythrosine and carmine are added to restore pink or natural colour and to help visualise fluid distribution.

Buffers such as borax or sodium citrate resist pH change and support consistent fixation.

Surfactants lower surface tension and improve wetting of tissue; excessive foam can interfere with mixing and injection.

Chelating agents bind metal ions in hard water and can improve solution stability and clarity.

Additive choice is a decision rule: humectant for dehydration, dye for pallor, buffer for pH control, surfactant for wetting and preservative for fixation.

Algor mortis is post-mortem cooling toward ambient temperature; rate is influenced by body size, clothing, environment and air movement.

Livor mortis is gravitational pooling of blood in dependent vessels; it blanches early and becomes fixed as tissue changes.

Rigor mortis results from ATP depletion and actin-myosin cross-bridging; it begins in small muscles and later resolves with decomposition.

Decomposition stages are commonly described as fresh, bloat, active decay, advanced decay and skeletonisation.

Putrefaction produces gases, odour and discolouration; green discolouration often appears in the right iliac fossa and marbling follows.

Post-mortem purging is decomposition fluid from cavities; it must not be confused with antemortem bleeding or vomit.

A post-mortem clot is typically gelatinous or 'chicken fat' and not attached to vessel wall; antemortem thrombus is adherent and organised.

Refrigeration slows decomposition and microbial growth; delay before cooling increases gas formation and tissue deterioration.

Post-mortem interval estimation is multifactorial and cannot rely on a single change such as rigor or livor alone.

Embalming aims are preservation, sanitisation, restoration and presentation; technique is selected to meet each aim without distorting tissue.

Arterial injection delivers fluid through arteries to capillaries; venous drainage removes blood and excess fluid and may be continuous or intermittent.

Common carotid and femoral arteries are first-choice injection sites; axillary, brachial or radial sites are alternatives.

Injection pressure should perfuse capillaries without extravasation; fragile, oedematous or decomposed bodies generally need lower pressure and slower flow.

Solution strength is selected from body condition, delay, infection risk and desired firmness; stronger is not automatically better.

Cavity embalming involves aspiration of thorax and abdomen followed by injection of concentrated cavity fluid.

Signs of distribution include tissue firming, appropriate colour, fluid in drainage and filling of superficial vessels.

Atherosclerosis, thrombosis and aneurysms can obstruct or divert flow; injection site and pressure are adjusted to avoid rupture and poor distribution.

Restricted drainage or oedema may require massage, repositioning, lower pressure and careful monitoring for swelling.

COSHH requires assessment of hazardous substances such as formaldehyde before work, including exposure routes, controls and emergency arrangements.

The hierarchy of control is elimination, substitution, engineering controls, administrative controls and PPE, in that order of preference.

Formaldehyde is a carcinogen and respiratory sensitiser; ventilation, exposure monitoring and suitable PPE are required.

Manual handling risk assessment covers hoists, team lifts, route planning and avoiding twisting under load.

Spill response: evacuate and ventilate, wear PPE, contain with absorbent, clean and decontaminate, and dispose as hazardous waste.

Waste streams include clinical, offensive, sharps and chemical waste; formalin-containing waste must not be discharged to drains.

Sharps injuries require immediate first aid, reporting and occupational health follow-up; contaminated sharps are never recapped.

Electrical equipment and wet environments require inspection, RCD protection and keeping water away from sockets.

Environmental duties include licensed waste contractors, correct storage and records of hazardous substance use and disposal.

Consent for embalming must come from the legally authorised person or as permitted by law; it cannot be assumed.

Identity should be confirmed using at least two identifiers and documented before, during and after procedures.

Chain of custody records document possession and transfer of the deceased and personal items.

Confidentiality and data protection require secure storage and need-to-know sharing of personal and health information.

Reportable or coroner or medical examiner cases require proper authority before embalming; interference can be unlawful.

The BIE code of practice and local regulations set standards for competence, consent, records and dignified care.

Records should include consent, identity checks, fluids used, injection sites, complications and disposal.

Ethical practice includes dignity, non-discrimination, cultural and religious sensitivity, and working within scope.

Photography, teaching or research use requires specific consent and anonymisation where appropriate.

Restorative art aims to restore symmetry, contour, natural colour and expression before cosmetic presentation.

Wax, epoxy and silicone restorations are built in thin layers; edges are blended to avoid visible ridges.

Colour correction follows the colour wheel: green neutralises red, yellow neutralises purple and peach reduces blue-grey.

Cosmetic foundation is matched to skin undertone and assessed under neutral daylight or balanced lighting.

Dehydration is managed with massage cream, humectants and tissue builder; over-hardening can worsen contour.

Suturing techniques include interrupted, continuous and subcuticular closures; hidden knots reduce visible marks.

Eye caps and mouth closure restore facial contour; over-tightening can distort features.

Hair and clothing presentation should follow family and cultural wishes and be checked from viewing distance.

Bruising and discolouration may require corrective colour before foundation; heavy layers can look unnatural.

Communication with families should use plain language, active listening and confirmation of understanding.

Explain procedures, likely appearance and viewing options honestly; avoid promising outcomes that cannot be controlled.

Cultural and religious needs such as washing, orientation, ornaments or presence of family should be asked about and documented.

Dignity means covering the deceased, preserving privacy, using respectful language and avoiding unnecessary exposure.

Handover between mortuary, funeral and care staff should include identity, consent, infection risk and special requests.

Incidents, complaints and near misses are reported and reviewed to improve practice.

Professional boundaries require recognising limits of competence and referring to senior colleagues or specialists.

Continuing professional development and reflective practice maintain competence and safety.