# A 72-year-old male client is receiving a continuous IV heparin infusion for a left lower-extremity deep vein thrombosis (DVT). The 0600 aPTT is 110 seconds (therapeutic target 60–80 seconds). On assessment the nurse notes pink-tinged urine, gum oozing while brushing teeth, and a new 4 cm bruise on the forearm. Vital signs: BP 138/84, HR 92, RR 18, T 36.7°C, SpO2 97%. Which is the priority nursing action?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=362064&lang=en  
> language: en  
> subject: System-Specific Assessments  
> category: ROR

## Question

A 72-year-old male client is receiving a continuous IV heparin infusion for a left lower-extremity deep vein thrombosis (DVT). The 0600 aPTT is 110 seconds (therapeutic target 60–80 seconds). On assessment the nurse notes pink-tinged urine, gum oozing while brushing teeth, and a new 4 cm bruise on the forearm. Vital signs: BP 138/84, HR 92, RR 18, T 36.7°C, SpO2 97%. Which is the priority nursing action?

## Option

1. Reduce the IV heparin infusion rate by 25% as outlined in the unit's standard protocol for supratherapeutic aPTT, and plan to recheck the aPTT in 6 hours to reevaluate the client's anticoagulation status.
2. Place the client on bleeding precautions, apply direct pressure to the gums, and maintain the IV heparin infusion at the current rate, reasoning that the aPTT will fall spontaneously over the next few hours given heparin's short half-life.
3. Stop the IV heparin infusion, notify the provider immediately for further orders (including possible protamine sulfate), implement bleeding precautions, and prepare to recheck the aPTT and CBC at provider-directed intervals. **✔ Correct answer**
4. Administer vitamin K 10 mg by slow IV push over several minutes, as it is the recommended antidote for heparin overdose, then reassess the aPTT in 30 minutes to ensure the level has decreased to the therapeutic range.

**Correct answer: 3**

## Explanation

The aPTT of 110 seconds is well above the 60-80 second target, and hematuria, gum oozing, and bruising show active bleeding. Option 3 is correct: stop the heparin infusion, notify the provider, institute bleeding precautions, and prepare for ordered CBC, aPTT monitoring, and possible protamine sulfate. Option 1 is incorrect because merely reducing the rate and waiting six hours delays treatment of active bleeding. Option 2 is incorrect because continuing heparin at the current rate leaves the client dangerously anticoagulated while bleeding continues; local pressure does not replace stopping the infusion. Option 4 is incorrect because vitamin K reverses warfarin, not heparin; protamine sulfate is the heparin antidote.

## In-depth explanation

Clinical Judgment
Apply NCJMM: Recognize cues (aPTT 110 vs target 60–80 + active bleeding: hematuria, gum oozing, new bruise) → Analyze cues (heparin overanticoagulation; clinically significant bleeding) → Generate solutions (STOP infusion + provider notification + bleeding precautions + prepare protamine) → Take action (stop, notify, implement precautions, prepare antidote) → Evaluate outcomes (aPTT trending down, bleeding controlled, no major hemorrhage).

Memory Tip
Heparin antidote = Protamine sulfate. Warfarin antidote = Vitamin K. Do not mix them up. aPTT > 2.5 × control or >100 seconds + active bleeding always means STOP now.

KR vs US
Korean wards may wait for the next rounds or apply a 25% rate-reduction standing order, but NCLEX requires immediate STOP + immediate notification when a critical lab is paired with active bleeding. Choosing vitamin K as the heparin antidote is always wrong on NCLEX.

## Clinical scenario

Clinical Practice Guide
ACCP / Chest heparin guidelines: the therapeutic aPTT target is typically 1.5–2.5 × control (institution-specific, often 60–80 seconds). Critically elevated aPTT (>2.5 × control or >100 seconds) plus any clinical bleeding mandates immediate cessation. Protamine sulfate dosing: 1 mg neutralizes ~100 units of heparin given in the prior 2–3 hours, with a maximum single dose of 50 mg. Rapid IV administration may cause hypotension or anaphylaxis, especially with fish allergy or prior protamine exposure.

Caution
Heparin = Protamine; Warfarin = Vitamin K; tPA = Aminocaproic acid; LMWH = Protamine (partial). Antidote pairing is a high-yield NCLEX trap — vitamin K is never the heparin reversal agent. Bleeding precautions: soft toothbrush, electric razor, no IM injections, fall prevention, stool softeners (avoid Valsalva), gentle suctioning, careful nail care, and pressure dressings on venipuncture sites.

## Key concepts

- **Activated partial thromboplastin time (aPTT)** — A laboratory test of the intrinsic coagulation pathway. The therapeutic target during heparin therapy is typically 1.5–2.5 × control (commonly 60–80 seconds). Values >100 seconds or >2.5 × control with clinical bleeding warrant immediate cessation and provider notification.
- **Protamine sulfate** — The reversal agent (antidote) for heparin overdose. Dose: 1 mg neutralizes ~100 units of heparin given in the prior 2–3 hours, with a maximum single dose of 50 mg. Given IV slowly because rapid administration can cause hypotension or anaphylaxis, especially in clients with fish allergy or prior protamine exposure.
- **Bleeding precautions** — Nursing interventions that minimize bleeding risk during anticoagulation: soft toothbrush, electric razor, no IM injections, fall prevention, stool softeners to avoid Valsalva strain, gentle suctioning, careful nail care, and pressure dressings on venipuncture sites.

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