What Should Elderly Hypertensive Patients Eat?
Normal blood pressure is essential for proper circulation. Regulated by multiple factors, it ensures adequate blood supply to tissues and organs, sustaining normal metabolism. Both excessively low (hypotension) and high (hypertension) blood pressure can lead to severe consequences, with complete loss of blood pressure being a precursor to death. This underscores the critical biological significance of blood pressure.
What is the normal blood pressure range?
A first-time reading below 120/80 mmHg is considered normal blood pressure; a first-time reading between 120-139/80-89 mmHg is classified as prehypertension; a first-time reading ≥140/90 mmHg but less than 180/110 mmHg is considered possible hypertension; three separate readings on different days exceeding 140/90 mmHg confirm hypertension; an initial reading exceeding180/110 mmHg is considered highly likely hypertension, requiring immediate antihypertensive treatment, further medical evaluation, and close blood pressure monitoring until levels reach a safe range. See the chart below for average normal blood pressure reference values (mmHg) for Chinese individuals:
Factors Affecting Blood Pressure
Blood pressure is measured in millimeters of mercury (mmHg). According to the World Health Organization's 1999 guidelines: - Below 120/80 mmHg is considered ideal systolic/diastolic blood pressure - Below 139/89 mmHg is normal blood pressure - 140/90 mmHg to 160/95 mmHg is prehypertension - 161/96 mmHg or higher is hypertension.Blood pressure ensures blood is transported normally through arteries to the entire body. If blood pressure is too low, it cannot adequately supply blood throughout the body. Conversely, excessively high blood pressure may damage blood vessels and may indicate abnormalities in the blood or heart. Blood pressure is influenced by the following factors:
1. Height: The taller the body, the greater the pressure the heart must exert to pump blood effectively throughout the body.
2. Age: Younger individuals have higher metabolic rates and greater blood flow, requiring the heart to pump with more force. This changes with age.
3. Blood viscosity (blood density): Thicker blood requires greater pressure from the heart to pump it through the vessels.
4. Posture: Blood pressure is higher when standing than when sitting, and higher when sitting than when lying down.This is due to the effects of gravity.
5. Vascular Resistance: If blood vessels narrow, blood flow becomes restricted, forcing the heart to exert greater pressure to pump blood.
6. Other Factors: Mental state, lifestyle rhythm, individual differences, dietary habits, medications, genetics, weather changes, etc.
Individuals Prone to Hypertension
1. Those with family history of hypertension (parents, siblings, etc.).
2. Obese individuals.
3. Those with excessive salt intake.
4. Heavy alcohol consumers.
5. Nervous or easily irritable individuals.
Individuals Prone to Hypotension
1. Young women.
2. Those on prolonged bed rest.
3. Individuals recovering from illness.
4. Individuals with a thin physique.
5. Women in menopause.
6. The elderly population.
Due to the inherent variability of blood pressure, multiple measurements taken on different days are necessary to determine whether elevated readings are persistent. Below, we explore methods for blood pressure measurement.