Vital Signs in Nursing Practice

Overview of Vital Signs in Nursing Practice

  • Vital signs are a crucial part of daily nursing practice.

  • Fundamental objective data for assessing patient health status.

  • Importance of knowing normal ranges for specific patients.

  • Requires critical thinking for patient assessment and documentation.

Commonly Measured Vital Signs

  • Conscious State: Includes checking alertness and coherence.

  • Pain: Recognized as the sixth vital sign.

  • Blood Pressure: Indicative of circulatory system health.

  • Oxygen Saturations: Usually monitored with a pulse oximeter.

  • Respiratory Rate: Assesses respiratory function.

  • Pulse: Reflects cardiovascular health.

  • Temperature: Indicates body metabolism status.

When to Assess Vital Signs

  • Upon admission: To establish baseline readings.

  • Regularly: Every 4-6 hours, especially for patients not in ICU or ED.

  • Pre- and Post-operative: To ensure patient stability and recovery.

  • After medication administration: Especially antihypertensive drugs.

  • Due to patient concerns or physical examination cues: When a nurse has ‘gut feelings’ about patient status.

Importance of Patient-Specific Normal Values

  • Normal ranges are general; must be tailored to each patient.

  • Understanding individual normal values is critical in identifying abnormalities.

  • Encourage patient communication on their usual values.

Anatomy and Physiology of Vital Signs

Body Temperature

  • Normal Range: 35.8°C to 37.5°C (normothermia or euthermia).

  • Regulated by the hypothalamus; affected by age, health activity, circadian rhythms, infection (surgery), environment, and hormonal changes.

  • Core temperature site: Tympanic (eardrum) membrane - same blood supply as the hypothalamus

  • Mechanisms of Heat Loss:

    • Radiation: Heat dissipation as electromagnetic waves.

    • Convection: Heat transfer through air movement.

    • Evaporation: Moisture loss through sweating.

    • Conduction: Direct transfer of heat when in contact with cooler objects.

  • Recognize terms:

    • Afebrile: Normal body temperature.

    • Pyrexia: Elevated body temperature; driven by pyrogens (core temperature above 38°C

Pulse

  • Definition: A wave of pressure from heartbeats, assessed at various pulse points.

  • Normal Range: 60 to 100 beats per minute for adults (varies by age).

  • Key Terms:

    • Tachycardia: Heart rate above 100 bpm.

    • Bradycardia: Heart rate below 60 bpm.

    • Arrhythmia/Dysrhythmia: Irregular pattern of heart rate

  • Importance of palpating the pulse correctly, noting characteristics (e.g., strength, rhythm).

Respiratory Rate

  • Normal Range: 12 to 20 breaths per minute for adults.

  • Assessing Respiratory Efforts: Look for depth, regularity, and any abnormal sounds (e.g., crackles - indicate fluid within the lung or collapse of alveoli, wheezes - results from narrowing of the airways from inflammation/mucus).

  • Recognising respiratory conditions (e.g., dyspnea, orthopnea).

Oxygen Saturation

  • Saturation of haemoglobin (SaO2): The percentage of haemoglobin bound to oxygen in the arteries

  • Normal Range: 95 to 100 as read with a pulse oximeter.

  • Assess overall patient appearance; look for physical signs of hypoxia despite machine readings.

Blood Pressure

  • Definition: The force of blood against vessel walls, expressed as systolic(ventricular contraction)/diastolic(ventricular relaxation)(e.g., 120/80 mmHg).

  • Normal Ranges: Systolic 90-120 and Diastolic 60-80 mmHg.

  • Measured in millimetres of mercury (mmHg)

  • Factors affecting blood pressure include hydration, medications, and patient positions (supine vs. standing).

  • Determinants of Blood Pressure:

    1. Cardiac Output: The amount of blood ejected from the left ventricle per minute (Stroke Volume [SV] x Heart Rate [HR])

    2. Vascular Resistance: The opposition to blood flow through the arteries

    3. Blood Volume: The amount of circulating blood through the arteries

    4. Blood Viscosity: Internal friction of adjacent fluid layers within the blood

    5. Compliance: Elasticity of blood vessel wall and ability to expand and contract

  • Importance of taking into account the proper cuff size for accurate readings.

Documentation of Vital Signs

  • Essential for maintaining accurate patient records and facilitating communication among healthcare providers.

  • Any abnormal finding must be documented and escalated accordingly.

  • Use standardized charts for documenting trends in vital signs.

Escalation of Concerns

  • Always verify findings before escalating (eyeball check).

  • Communicate concerns clearly with appropriate healthcare professionals.

  • Document findings and interventions taken for abnormalities.

  • Use an assessment tool (often colored scales) to indicate urgency of action required.

Summary of Vital Signs Monitoring

  • Vital signs provide essential data reflecting patient health status.

  • Correct assessment techniques and documentation practices are vital for effective nursing care and patient safety.

  • Understanding how to respond to and document abnormal findings is crucial for patient management in nursing.