# A nurse is monitoring a client receiving a continuous IV heparin infusion for pulmonary embolism. Which findings should the nurse recognize as signs of bleeding that require immediate provider notification? Select all that apply.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=363988&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A nurse is monitoring a client receiving a continuous IV heparin infusion for pulmonary embolism. Which findings should the nurse recognize as signs of bleeding that require immediate provider notification? Select all that apply.

1

Pulse oximetry 96 percent on room air

2

Bleeding gums after toothbrushing

3

Hematuria

4

Black, tarry stools

5

aPTT result 1.5 to 2.5 times the control value

## Explanation

Hematuria, melena (black tarry stools), and gum bleeding after gentle brushing are signs of heparin-induced systemic bleeding and require immediate provider notification. Pulse oximetry 96 percent is normal. An aPTT 1.5 to 2.5 times control is the therapeutic range for heparin and is the expected goal.

## In-depth explanation

Clinical Judgment
Heparin bleeding signs: hematuria, melena, gum bleeding, hematemesis, ecchymosis, severe headache (intracranial). Therapeutic aPTT: 1.5-2.5 × control (or anti-Xa 0.3-0.7 IU/mL). Reversal: protamine sulfate 1 mg per 100 units heparin (max 50 mg).

Memory Tip
Heparin bleed = HEPARIN: Hematuria, Ecchymosis, Petechiae, Anemia, Reduced HCT, INR or aPTT high, Nosebleed

KR vs US
Therapeutic aPTT range and reversal protocol identical worldwide. Korean tertiary hospitals also use anti-Xa monitoring for unfractionated heparin in critical care; community hospitals still rely on aPTT.

## Clinical scenario

Clinical Practice Guide
Heparin monitoring (CHEST 2021 Antithrombotic Guidelines):
- aPTT goal 1.5-2.5 × control or institution-specific therapeutic range
- Anti-Xa goal 0.3-0.7 IU/mL (more accurate, less interference)
- Baseline labs: aPTT, PT/INR, CBC, platelets
- Recheck aPTT 6 hours after start and after each rate change
- Daily CBC for HIT screening

HIT (heparin-induced thrombocytopenia):
- Platelet drop >50 percent from baseline within 5-10 days
- Paradoxical thrombosis
- Stop heparin, start alternative anticoagulant (argatroban, bivalirudin)

Caution
Reversal: protamine sulfate 1 mg per 100 units heparin (max 50 mg/dose). Slow IV push to avoid hypotension and anaphylaxis. Have epinephrine readily available.

## Key concepts

- **Heparin** — Indirect thrombin inhibitor that potentiates antithrombin III to inactivate factors IIa (thrombin) and Xa. IV continuous infusion for acute thrombosis (DVT, PE, MI, stroke). Monitored by aPTT or anti-Xa. Antidote: protamine sulfate.
- **aPTT therapeutic range** — Activated partial thromboplastin time, monitored during unfractionated heparin therapy. Therapeutic goal 1.5-2.5 times control (60-100 seconds for most labs). Below: subtherapeutic, increase rate. Above: bleeding risk, hold or decrease rate.
- **HIT (heparin-induced thrombocytopenia)** — Immune-mediated platelet drop occurring 5-10 days after heparin exposure (or within hours if prior exposure). Platelets fall >50 percent from baseline. Paradoxical thrombosis risk. Stop heparin immediately and switch to direct thrombin inhibitor (argatroban) or factor Xa inhibitor.

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