Capablanca's high blood pressure was not correctly diagnosed and treated until after the AVRO tournament, and caused him to lose his train of thought towards the end of playing sessions. In 1940, he had extremely dangerous hypertension of 210 systolic/180 diastolic (hypertensive crisis is 180/120 or above, and even after treatment Capablanca had 180/130).Capablanca's Death, chesshistory.com.
Capablanca's high blood pressure was not correctly diagnosed and treated until after the AVRO tournament and caused him to lose his train of thought towards the end of playing sessions In 1940 he had extremely dangerous hypertension of 210 systolic/180 diastolic (hypertensive crisis is 180/120 or above and even after treatment Capablanca had 180/130)Capablanca's Death chesshistorycom