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Hypertension optimal treatment (HOT) study: a brilliant concept, but a qualified success
1University of Sydney and Royal North Shore Hospital, NSW, Australia.
Insights
Low-dose aspirin effectively prevents myocardial infarction in hypertensive patients. Aggressive blood pressure lowering is achievable, but target blood pressure groups showed no significant cardiovascular event differences.
Area of Science:
- Cardiology
- Pharmacology
- Hypertension Research
Background:
- The Hypertension Optimal Treatment (HOT) study investigated primary prevention of myocardial infarction with low-dose aspirin in hypertensive patients.
- It also assessed benefits of progressively lowering diastolic blood pressure from 90 mmHg to below 80 mmHg.
Purpose of the Study:
- To determine if low-dose aspirin (75 mg/day) prevents myocardial infarction without increasing cerebral hemorrhage in controlled hypertensive patients.
- To evaluate if aggressive blood pressure reduction offers additional cardiovascular benefits.
Main Methods:
- Randomized controlled trial involving hypertensive patients.
- Intervention groups focused on different target diastolic blood pressure levels.
- Low-dose aspirin (75 mg/day) was administered to assess its preventive effects.
Main Results:
- Low-dose aspirin proved effective in the primary prevention of myocardial infarction.
- Aggressive combination therapy successfully lowered blood pressure in over 90% of hypertensive subjects.
- Intention-to-treat analysis did not reveal significant differences in cardiovascular events across randomized blood pressure target groups.
Conclusions:
- Low-dose aspirin is a valuable tool for myocardial infarction prevention in hypertensive individuals.
- Aggressive blood pressure management is feasible and effective in achieving normotensive ranges.
- Further research is needed to clarify the impact of specific blood pressure targets on cardiovascular event rates.
Background To The Study:
The Hypertension Optimal Treatment (HOT) study was designed to answer two questions: whether low-dose aspirin (75 mg/day) is effective in the primary prevention of myocardial infarction, without an increase in cerebral haemorrhage in hypertensive patients whose blood pressure is well controlled, and whether there are additional benefits with a progressive reduction of diastolic blood pressure from 90 mmHg to below 80 mmHg.
Successes:
In a landmark outcome, low-dose aspirin was indeed shown to be effective in the primary prevention of myocardial infarction. Moreover, the study has shed light on many important issues for blood pressure lowering in the treatment of hypertension, providing an excellent demonstration that with aggressive combination therapy, the elevated blood pressure in hypertensive subjects can be lowered and maintained in the normotensive range in over 90% of cases. DISAPPOINTMENT: The biggest disappointment was that the intention to treat analysis failed to demonstrate a significant difference between the three randomized target blood pressure groups for the majority of cardiovascular events.