Blood Loss, Infiltration, Clotting, Air, Hemolysis, and Fever
Key Takeaways
- For a suspected air embolism: STOP the blood pump, CLAMP the venous line, and place the patient in the left-lateral Trendelenburg (left side, head down) position to trap air in the right atrium - then give oxygen and call for emergency help.
- Hemolysis turns blood cherry-red/port-wine and translucent; signs include chest/back pain, shortness of breath, and dyspnea - stop the pump, do NOT return blood to the patient, clamp lines, and escalate, because released potassium can be fatal.
- Causes of hemolysis to recognize: kinked/occluded bloodlines, overheated or hypotonic (wrong-concentrate) dialysate, chemical/chloramine contamination, and a malfunctioning or too-small needle - many are preventable setup errors.
- Dialyzer (first-use) reactions: Type A (anaphylactic) is severe and early - stop dialysis, clamp lines, do NOT return blood, support airway/breathing, escalate; Type B is milder, later, and treatment may continue with the RN's direction.
- A blood leak alarm signals a ruptured dialyzer membrane; clotting shows as rising venous pressure, dark/streaked blood, and clots in the chamber; new fever/chills (rigors) during treatment may signal access infection or a pyrogen reaction - get vitals, follow culture/infection policy, and notify the RN.
Air Embolism - Clamp and Position
Air embolism is air entering the bloodstream through the venous line - from a loose connection, an empty IV/saline bag run dry, an open port, or a failed air detector. It is a true emergency because air can lodge in the heart or lungs.
Signs include sudden shortness of breath, chest pain, cyanosis, coughing, a churning/'mill-wheel' sound, anxiety, and loss of consciousness. The air/foam detector alarm or visible air or foam in the venous line is the warning.
First Actions for Suspected Air Embolism (memorize)
- STOP the blood pump immediately.
- CLAMP the venous bloodline to stop more air from entering the patient.
- Position the patient on the LEFT side in Trendelenburg (left-lateral Trendelenburg: left side down, head down, feet up). This traps air in the right atrium/apex of the right ventricle, away from the pulmonary outflow and brain.
- Administer oxygen and call for emergency help / notify the RN at once.
- Stay with the patient; do not silence the alarm without correcting the cause.
The left-lateral Trendelenburg position is the single most-tested fact for air embolism. Compare it with regular Trendelenburg (supine, head down) used for hypotension - the exam pairs these to catch confusion.
Hemolysis and Dialyzer Reactions
Hemolysis is the destruction of red blood cells in the extracorporeal circuit. It is a high-risk emergency because ruptured cells dump potassium into the plasma, which can cause fatal hyperkalemia and cardiac arrest if that blood is returned.
Recognize it: the blood in the venous line looks cherry-red, port-wine, or translucent ('Kool-Aid'/'cola' appearance); the patient may have chest pain, back pain, shortness of breath, dyspnea, and a feeling of impending doom.
First actions: STOP the blood pump, CLAMP the lines, do NOT return the hemolyzed blood to the patient, and escalate immediately. Returning that high-potassium blood can kill the patient.
Causes to recognize (many are preventable):
- Kinked, clamped, or occluded bloodlines (mechanical shear);
- Overheated dialysate (temperature too high);
- Hypotonic / wrong-concentrate dialysate (incorrect mixing);
- Chemical contamination - especially chloramine that defeated the carbon filters, formaldehyde, or bleach;
- A defective or undersized needle creating excessive negative pressure.
Dialyzer (First-Use) Reactions
| Type | Onset & Severity | Signs | Action |
|---|---|---|---|
| Type A (anaphylactic) | First few minutes; severe | Dyspnea, burning, angioedema, itching, chest/back pain, hypotension, sense of doom | Stop dialysis, clamp lines, do NOT return blood, support airway/O2, escalate immediately |
| Type B (nonspecific) | Later (15-60+ min); milder | Back and chest pain | Notify RN; treatment often continues under RN direction with supportive care |
Type A is the dangerous one - treat it like anaphylaxis. The fact that blood is not returned in Type A links it to the hemolysis rule.
Blood Loss, Infiltration, Clotting, Blood Leak, and Fever
Blood loss from a dislodged venous needle or a separated connection is rapidly life-threatening - a patient can lose a large volume in minutes at dialysis blood-flow rates. Clues: wet clothing, blood on the chair or floor, a leaking connection. Stop the pump, apply pressure to the site, protect the access, and call for help. Keep the venous needle visible at all times so a dislodgement is seen, not hidden under a blanket.
Infiltration is blood leaking into the tissue around a needle - swelling, firmness, pain, and bruising near the site with poor flow. Stop using the affected needle per protocol and notify the RN.
Clotting in the circuit shows as rising venous pressure, dark blood, streaking or dark striations in the dialyzer, and visible clots in the drip chamber. Report the trend; do not ignore it.
A blood leak alarm means blood has crossed a ruptured dialyzer membrane into the dialysate - the machine detects blood on the dialysate side. Follow the machine response and policy; do not bypass the alarm.
Fever and Chills
New fever, chills, or rigors during treatment may signal an access (bloodstream) infection or a pyrogen/endotoxin reaction from contaminated water or dialysate (recall AAMI limits: dialysate bacteria action level 50 CFU/mL, endotoxin action level 1 EU/mL). Get a full set of vitals, notify the RN, and follow the facility's blood-culture and infection-control policy. Document objectively.
| Event | Key Clue | Priority First Action |
|---|---|---|
| Needle dislodgement / blood loss | Blood on chair, leaking connection | Stop pump, apply pressure, call for help |
| Infiltration | Swelling, pain, firmness at site | Stop using that needle, notify RN |
| Clotting | Rising venous pressure, dark/streaked blood | Assess circuit, report trend |
| Blood leak alarm | Machine detects blood in dialysate | Follow machine/policy response, notify RN |
| Air embolism | Foam/air alarm, dyspnea, churning sound | Stop pump, clamp venous line, left-lateral Trendelenburg, O2 |
| Hemolysis | Cherry-red/translucent blood, chest/back pain | Stop pump, clamp, do NOT return blood, escalate |
| Fever/chills | Rigors, temperature rise | Vitals, notify RN, culture/infection policy |
Notice that several emergencies share the stop-the-pump-and-clamp opening move - air embolism, hemolysis, a Type A reaction, and major blood loss all begin there. What differs is the second step: left-lateral Trendelenburg for air, do-not-return-blood for hemolysis and Type A, and direct pressure for needle dislodgement. The exam tests whether you can keep these distinct.
A technician hears the air detector alarm and sees foam in the venous line; the patient suddenly becomes dyspneic and anxious. After stopping the blood pump and clamping the venous line, in which position should the patient be placed?
A technician notices the blood in the venous line has turned a translucent cherry-red 'cola' color and the patient complains of chest and back pain and shortness of breath. What must the technician NOT do?
A patient on a new dialyzer develops severe dyspnea, generalized itching, a burning sensation, and a feeling of impending doom within the first few minutes of treatment. This is most consistent with which reaction, and what is the action?
Which combination of findings should make a technician suspect hemolysis caused by a preventable setup error rather than patient illness?