Normal Values for Systolic and Diastolic Blood Pressure

May 23, 2022 Source: Cainiu Health

Dr. Li Man

Introduction

The normal systolic blood pressure is below 120 mmHg, and the normal diastolic blood pressure is below 80 mmHg. Hypertension is defined as a systolic blood pressure ≥140 mmHg and/or a diastolic blood pressure ≥90 mmHg. A systolic blood pressure of 120–139 mmHg and/or a diastolic blood pressure of 80–89 mmHg is classified as “elevated” (or “high-normal”).

Blood pressure is a vital physiological indicator in humans. It fluctuates continuously throughout the day, and its measurement relies not only on instruments but also on clinical experience. Therefore, blood pressure readings are generally considered reference values rather than absolute, precise measurements. Variations inevitably occur between different healthcare providers, institutions, and even among repeated measurements taken at different times—even for the same individual. Consequently, “normal” blood pressure is defined as a range, not a single fixed value. So, what constitutes normal systolic and diastolic blood pressure?

Normal Systolic and Diastolic Blood Pressure Values

Normal systolic blood pressure is below 120 mmHg, and normal diastolic blood pressure is below 80 mmHg. Hypertension is diagnosed when systolic blood pressure reaches or exceeds 140 mmHg and/or diastolic blood pressure reaches or exceeds 90 mmHg. Systolic blood pressure between 120–139 mmHg and diastolic blood pressure between 80–89 mmHg define the “elevated” (or “high-normal”) range. Without timely lifestyle modifications and management of cardiovascular risk factors, individuals in this category are likely to progress rapidly to established hypertension.

Moreover, if blood pressure exceeds 140/90 mmHg, prompt medical evaluation and treatment at a hospital are essential. Treatment strategies vary depending on the severity of hypertension and are determined by physicians based on comprehensive clinical assessment. Patients must visit a healthcare facility in person for proper diagnosis and management—self-medication is strongly discouraged, as it may hinder accurate diagnosis and appropriate care.

It is recommended that blood pressure be measured after resting quietly for several minutes in a calm, distraction-free environment to ensure accuracy and reflect true baseline values. We hope this information is helpful! Wishing you good health and happiness!

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What are the indicators of effective chest compressions in cardiopulmonary resuscitation (CPR)?

Indicators of effective chest compressions during cardiopulmonary resuscitation (CPR) generally include restoration of major arterial pulses, achievement of target systolic blood pressure, improvement in peripheral circulation, changes in pupil response, and return of spontaneous breathing. Restoration of major arterial pulses: When compressions are effective, pulsations in major arteries such as the carotid or femoral artery can be palpated. This indicates that chest compressions have successfully re-established circulation, enabling adequate blood perfusion to vital organs.